CN111911139A - Slow-release tracing controllable system for water exploration of oil and gas well, preparation method and application - Google Patents
Slow-release tracing controllable system for water exploration of oil and gas well, preparation method and application Download PDFInfo
- Publication number
- CN111911139A CN111911139A CN202010820161.0A CN202010820161A CN111911139A CN 111911139 A CN111911139 A CN 111911139A CN 202010820161 A CN202010820161 A CN 202010820161A CN 111911139 A CN111911139 A CN 111911139A
- Authority
- CN
- China
- Prior art keywords
- tracer
- slow
- release
- water
- tracing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 74
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 239000000700 radioactive tracer Substances 0.000 claims abstract description 89
- 239000000463 material Substances 0.000 claims abstract description 36
- 239000003607 modifier Substances 0.000 claims abstract description 10
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 9
- 230000015556 catabolic process Effects 0.000 claims abstract description 8
- 238000006731 degradation reaction Methods 0.000 claims abstract description 8
- 238000001125 extrusion Methods 0.000 claims description 41
- 238000002156 mixing Methods 0.000 claims description 27
- 229920000747 poly(lactic acid) Polymers 0.000 claims description 25
- 239000004626 polylactic acid Substances 0.000 claims description 25
- 238000013268 sustained release Methods 0.000 claims description 21
- 239000012730 sustained-release form Substances 0.000 claims description 21
- 239000007787 solid Substances 0.000 claims description 14
- 239000002202 Polyethylene glycol Substances 0.000 claims description 12
- 239000008187 granular material Substances 0.000 claims description 12
- 229920001223 polyethylene glycol Polymers 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 11
- 229920001577 copolymer Polymers 0.000 claims description 10
- 238000005469 granulation Methods 0.000 claims description 10
- 230000003179 granulation Effects 0.000 claims description 10
- 229920001903 high density polyethylene Polymers 0.000 claims description 10
- 239000004700 high-density polyethylene Substances 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- 238000007493 shaping process Methods 0.000 claims description 9
- 229920000954 Polyglycolide Polymers 0.000 claims description 8
- 229920000331 Polyhydroxybutyrate Polymers 0.000 claims description 8
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 8
- 239000005015 poly(hydroxybutyrate) Substances 0.000 claims description 8
- 239000004633 polyglycolic acid Substances 0.000 claims description 8
- 150000003839 salts Chemical class 0.000 claims description 8
- 239000011259 mixed solution Substances 0.000 claims description 6
- 229910021654 trace metal Inorganic materials 0.000 claims description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 4
- 229910052775 Thulium Inorganic materials 0.000 claims description 4
- -1 fluorobenzoic acid compound Chemical class 0.000 claims description 4
- 239000011159 matrix material Substances 0.000 claims description 4
- 239000002861 polymer material Substances 0.000 claims description 4
- 238000006116 polymerization reaction Methods 0.000 claims description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 3
- 229910052691 Erbium Inorganic materials 0.000 claims description 3
- 229910052693 Europium Inorganic materials 0.000 claims description 3
- 229910052689 Holmium Inorganic materials 0.000 claims description 3
- 229910052772 Samarium Inorganic materials 0.000 claims description 3
- 229910052769 Ytterbium Inorganic materials 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 229910052792 caesium Inorganic materials 0.000 claims description 3
- TVFDJXOCXUVLDH-UHFFFAOYSA-N caesium atom Chemical compound [Cs] TVFDJXOCXUVLDH-UHFFFAOYSA-N 0.000 claims description 3
- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 claims description 3
- OGPBJKLSAFTDLK-UHFFFAOYSA-N europium atom Chemical compound [Eu] OGPBJKLSAFTDLK-UHFFFAOYSA-N 0.000 claims description 3
- KJZYNXUDTRRSPN-UHFFFAOYSA-N holmium atom Chemical compound [Ho] KJZYNXUDTRRSPN-UHFFFAOYSA-N 0.000 claims description 3
- KZUNJOHGWZRPMI-UHFFFAOYSA-N samarium atom Chemical compound [Sm] KZUNJOHGWZRPMI-UHFFFAOYSA-N 0.000 claims description 3
- NAWDYIZEMPQZHO-UHFFFAOYSA-N ytterbium Chemical compound [Yb] NAWDYIZEMPQZHO-UHFFFAOYSA-N 0.000 claims description 3
- ZMKVBUOZONDYBW-UHFFFAOYSA-N 1,6-dioxecane-2,5-dione Chemical compound O=C1CCC(=O)OCCCCO1 ZMKVBUOZONDYBW-UHFFFAOYSA-N 0.000 claims description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 2
- 229910052688 Gadolinium Inorganic materials 0.000 claims description 2
- 229910052765 Lutetium Inorganic materials 0.000 claims description 2
- 229910052777 Praseodymium Inorganic materials 0.000 claims description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 2
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims description 2
- 229910052793 cadmium Inorganic materials 0.000 claims description 2
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 claims description 2
- 229910052804 chromium Inorganic materials 0.000 claims description 2
- 239000011651 chromium Substances 0.000 claims description 2
- 229910017052 cobalt Inorganic materials 0.000 claims description 2
- 239000010941 cobalt Substances 0.000 claims description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 2
- UIWYJDYFSGRHKR-UHFFFAOYSA-N gadolinium atom Chemical compound [Gd] UIWYJDYFSGRHKR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052738 indium Inorganic materials 0.000 claims description 2
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 claims description 2
- OHSVLFRHMCKCQY-UHFFFAOYSA-N lutetium atom Chemical compound [Lu] OHSVLFRHMCKCQY-UHFFFAOYSA-N 0.000 claims description 2
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 150000002823 nitrates Chemical class 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 229920000218 poly(hydroxyvalerate) Polymers 0.000 claims description 2
- 229920001610 polycaprolactone Polymers 0.000 claims description 2
- 239000004632 polycaprolactone Substances 0.000 claims description 2
- PUDIUYLPXJFUGB-UHFFFAOYSA-N praseodymium atom Chemical compound [Pr] PUDIUYLPXJFUGB-UHFFFAOYSA-N 0.000 claims description 2
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 claims description 2
- 229910052719 titanium Inorganic materials 0.000 claims description 2
- 239000010936 titanium Substances 0.000 claims description 2
- 229910052727 yttrium Inorganic materials 0.000 claims description 2
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 claims description 2
- 229910052726 zirconium Inorganic materials 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 abstract description 14
- 230000007774 longterm Effects 0.000 abstract description 7
- 230000007062 hydrolysis Effects 0.000 abstract description 4
- 238000006460 hydrolysis reaction Methods 0.000 abstract description 4
- 239000008398 formation water Substances 0.000 abstract description 2
- 230000000813 microbial effect Effects 0.000 abstract description 2
- 238000012545 processing Methods 0.000 description 29
- 238000001746 injection moulding Methods 0.000 description 21
- 230000000694 effects Effects 0.000 description 18
- 238000004519 manufacturing process Methods 0.000 description 17
- 238000001035 drying Methods 0.000 description 16
- 239000007789 gas Substances 0.000 description 15
- 239000000203 mixture Substances 0.000 description 15
- 238000005070 sampling Methods 0.000 description 15
- PYOOBRULIYNHJR-UHFFFAOYSA-K trichloroholmium Chemical compound Cl[Ho](Cl)Cl PYOOBRULIYNHJR-UHFFFAOYSA-K 0.000 description 13
- 238000005516 engineering process Methods 0.000 description 8
- 238000002474 experimental method Methods 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 239000007788 liquid Substances 0.000 description 7
- 239000000126 substance Substances 0.000 description 7
- 239000004372 Polyvinyl alcohol Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- HDGGAKOVUDZYES-UHFFFAOYSA-K erbium(iii) chloride Chemical compound Cl[Er](Cl)Cl HDGGAKOVUDZYES-UHFFFAOYSA-K 0.000 description 5
- 238000011156 evaluation Methods 0.000 description 5
- 229920002451 polyvinyl alcohol Polymers 0.000 description 5
- 239000011573 trace mineral Substances 0.000 description 5
- 235000013619 trace mineral Nutrition 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- MWFSXYMZCVAQCC-UHFFFAOYSA-N gadolinium(iii) nitrate Chemical compound [Gd+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O MWFSXYMZCVAQCC-UHFFFAOYSA-N 0.000 description 4
- ICAKDTKJOYSXGC-UHFFFAOYSA-K lanthanum(iii) chloride Chemical compound Cl[La](Cl)Cl ICAKDTKJOYSXGC-UHFFFAOYSA-K 0.000 description 4
- 239000003129 oil well Substances 0.000 description 4
- ONOTYLMNTZNAQZ-UHFFFAOYSA-N 2,6-difluorobenzoic acid Chemical compound OC(=O)C1=C(F)C=CC=C1F ONOTYLMNTZNAQZ-UHFFFAOYSA-N 0.000 description 3
- 239000003822 epoxy resin Substances 0.000 description 3
- 229920000647 polyepoxide Polymers 0.000 description 3
- BHXBZLPMVFUQBQ-UHFFFAOYSA-K samarium(iii) chloride Chemical compound Cl[Sm](Cl)Cl BHXBZLPMVFUQBQ-UHFFFAOYSA-K 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- AIYUHDOJVYHVIT-UHFFFAOYSA-M caesium chloride Chemical compound [Cl-].[Cs+] AIYUHDOJVYHVIT-UHFFFAOYSA-M 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000012790 confirmation Methods 0.000 description 2
- 239000012153 distilled water Substances 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- ILOTUXNTERMOJL-UHFFFAOYSA-K thulium(iii) chloride Chemical compound Cl[Tm](Cl)Cl ILOTUXNTERMOJL-UHFFFAOYSA-K 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033558 biomineral tissue development Effects 0.000 description 1
- 238000004523 catalytic cracking Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 150000003841 chloride salts Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013270 controlled release Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 230000002354 daily effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- NNMXSTWQJRPBJZ-UHFFFAOYSA-K europium(iii) chloride Chemical compound Cl[Eu](Cl)Cl NNMXSTWQJRPBJZ-UHFFFAOYSA-K 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000009616 inductively coupled plasma Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 230000007281 self degradation Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- CKLHRQNQYIJFFX-UHFFFAOYSA-K ytterbium(III) chloride Chemical compound [Cl-].[Cl-].[Cl-].[Yb+3] CKLHRQNQYIJFFX-UHFFFAOYSA-K 0.000 description 1
Images
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention provides a tracing slow-release system for water exploration of an oil-gas well as a preparation method and application thereof, wherein the tracing slow-release system comprises a tracing agent slow-release medium with the mass fraction of 10-40%, a tracing agent with the mass fraction of 5-15%, a framework material with the mass fraction of 50-80%, a compatibilizer with the mass fraction of 1-3% and a hydrophilic modifier with the mass fraction of 2-5%. The tracer slow-release system can adjust the proportion of the mediator materials in the system according to the hydrolysis and microbial degradation rules of the mediator materials in the formation water, realizes the controllable release of the tracer, can realize the quick positioning of the water outlet point of a vertical well in a short time, and can also realize the long-term monitoring of the water outlet point of a multi-section horizontal well.
Description
Technical Field
The invention relates to the technical field of water exploration of multi-section fractured oil-gas horizontal wells, in particular to a slow-release tracing controllable system for water exploration of oil-gas wells and application thereof.
Technical Field
In recent years, along with the increasing storage and increasing production difficulty of conventional petroleum and natural gas resources, the unconventional oil and gas resources occupy more and more important positions in the energy structure of China. However, such reservoirs are low in porosity and permeability, low in productivity and difficult to stabilize using conventional mining techniques. At present, the horizontal well multistage fracturing technology is taken as a key technology for effectively developing the oil field, is developed rapidly and is widely applied. However, due to the influences of factors such as heterogeneous degree, crack distribution, edge and bottom water distribution and the like, a part of fracturing sections of the horizontal well are easily flooded by water, and particularly, more and more water injection production increasing technologies are applied at present, so that liquid production of the part of fracturing sections is uneven, and the single-well yield is seriously influenced. Thus. How to quickly and accurately find the water outlet section of the horizontal well and timely take water plugging measures is very important for recovering the oil gas productivity.
At present, technical means applied to directional wells and horizontal wells at home and abroad mainly comprise mechanical packing water finding, underground hydraulic switch layer adjustment water finding, liquid production profile testing, inter-well connectivity analysis, numerical simulation and the like, and the technologies are applied to the field to provide certain technical guidance for finding underground water outlet points. Among them, the technology of monitoring the water outlet point by using the slow-release tracer has received more and more attention because of its low cost, simple process and no interference to oil well production. However, the slow-release tracer system which can be really used for the water exploration technology at present is very limited, and the controllable release of the tracer is difficult to achieve, so that the slow-release tracer system cannot be simultaneously applied to the quick confirmation of the water outlet section of a water outlet well and the long-acting monitoring of the water outlet point of a multi-stage horizontal well, and the further popularization and application of the technology are severely limited.
Chinese patent document CN109469481A (cn201811591800.x) discloses a chemical combination tracer, which comprises multiple groups of slow-release solid tracers with the same number of groups as the number of sections to be monitored of a horizontal oil well, wherein each group of slow-release solid tracers comprises: the water-soluble solid tracer is spherical with the diameter of 1-1.2cm, and comprises a water-soluble chemical tracer, epoxy resin 506 and maleic anhydride in a mass ratio of 1:2: 1; the oil-soluble solid tracer is spherical with the diameter of 1-1.2cm, and comprises an oil-soluble chemical tracer, epoxy resin 506 and maleic anhydride in a mass ratio of 1:2: 1. The invention has the advantages of increasing the contact uniformity of the slow-release solid tracer and the oil liquid level or the water liquid level and improving the detection accuracy. However, the carrier used in the slow release system has large matrix viscosity in the actual thermal processing process, which brings difficulty to processing and mixing, and the added water-soluble chemical tracer is a fluorobenzoic acid compound, so that the slow release speed is slow, and the efficiency of positioning and water finding of a production well is greatly reduced.
Chinese patent document CN107795310A (201610806813.9) provides a long-term real-time tracking method for staged fracturing effect of a horizontal well, which includes: step 1, screening out a fluorescent tracer through an experiment; step 2, preparing the tracing ceramsite by taking the screened fluorescent substance as a tracing substance and taking the porous ceramsite as a carrier; step 3, spraying a polymer slow-release film on the surface of the ceramsite to prepare slow-release tracing ceramsite; step 4, in staged fracturing construction, injecting different types of slow-release tracing ceramsite into each fracturing section along with common fracturing ceramsite; and 5, sampling and testing at a well mouth, analyzing the type and the concentration of the fluorescent substance, and calculating the contribution rate of the effective production interval and the production fluid. The method for tracking the staged fracturing effect of the horizontal well in real time for a long time can judge the contribution rate of the production intervals and each interval, so that the staged fracturing effect of the horizontal well can be tracked and evaluated in real time for a long time. However, the ceramsite type tracing system can only be added with a propping agent during staged fracturing operation, and cannot be used for quickly confirming the water outlet section of an early yielding production well.
Disclosure of Invention
In order to solve the problems that in the prior art, a slow-release tracer system for water exploration technology is few, the tracer cannot be controllably released, and the system has universality on various oil wells, and the like, the slow-release tracer system for water exploration of oil and gas wells, and the preparation method and the application thereof are provided. The invention combines the hydrolysis rule of a degradable high polymer material and the trace.
The invention controls the quick release and slow release of the degradable high molecular material and the water-soluble trace element tracer agent under the condition of stratum water content by using the content of the degradable high molecular material and the water-soluble trace element tracer agent. In a slow release system, the content of the degradable material is high and the degradation speed is slow within a certain dosage range, so that long-acting slow release can be realized. The content of the degradable material is low, the degradation speed is high, and short-term quick release can be realized.
In order to achieve the above purpose, the present invention can be realized by the following technical solutions:
a tracing slow-release system for water exploration of oil and gas wells is characterized by comprising a tracing agent slow-release mediator accounting for 10-40% of the mass fraction, a tracing agent accounting for 5-15% of the mass fraction, a framework material accounting for 50-80% of the mass fraction, a compatibilizer accounting for 1-3% of the mass fraction, and a hydrophilic modifier accounting for 2-5% of the mass fraction.
The slow release medium mainly plays a role in slowly releasing the internally mixed tracer through self degradation, and when the proportion of the slow release medium in a system is too low or too high, the release of the tracer becomes difficult. When the proportion is less than 10 percent of the system, the slow release mediator belongs to an island phase structure in the system and is wrapped by the framework material, and the tracer is difficult to release. When the proportion is higher than 40% of the system, the degradation speed of the mediator material is slow, so that the tracer is released too slowly and cannot play a tracing effect.
If the content of the tracer in the system is less than 5%, the release amount is too small, and the tracer effect is difficult to achieve; more than 15%, it is difficult to mix the dielectric material with the polymer.
The function of the compatibilizer is to increase the compatibility of the sustained-release mediator material and the framework material, and the excessive content is not good for the embodiment of the optimal comprehensive performance of the sustained-release system. Too little addition does not work; if added too much, precipitates on the surface.
The hydrophilic modifier has the effects of improving the surface tension of the framework material, increasing the hydrophilicity of a slow-release system, facilitating the release of the tracer component, having too little content and no modification effect, and having too much content which can cause adverse effects on the original mechanical properties of the system.
Preferably, the tracer sustained-release medium is a high molecular material capable of realizing slow degradation under the formation condition, and comprises one or more of polylactic acid, polyglycolic acid, poly (glycolide-co-lactide), poly (butylene succinate), polycaprolactone, polyhydroxyvalerate and polyhydroxybutyrate; more preferably, the sustained-release mediator is one or more of polylactic acid, polyglycolic acid, and polyhydroxybutyrate.
Preferably, the tracer is a water-soluble salt of a trace metal element or a fluorobenzoic acid compound, and the preferred tracer is a water-soluble salt of a trace metal element. The tracer is released by degrading the mediator material, so that the defect that the release of the fluorobenzoic acid compound in the epoxy resin system is too slow can be overcome.
Preferably, the framework material is a high polymer material with the molecular weight of 40000-300000, and is preferably high-density polyethylene.
Preferably, the compatibilizer is one or more of an ethylene-butyl acrylate-glycidyl methacrylate copolymer, a maleic anhydride grafted ethylene octene copolymer and a maleic anhydride grafted propylene copolymer, and further preferably, the compatibilizer is an ethylene-butyl acrylate-glycidyl methacrylate copolymer.
Preferably, the hydrophilic modifier is polyethylene glycol with a polymerization degree of 200-600, and preferably, the hydrophilic modifier is polyethylene glycol with a polymerization degree of 200.
Preferably, the water-soluble salt of the trace metal element is an anhydrous chloride salt or nitrate salt of samarium, zirconium, titanium, cadmium, yttrium, cobalt, gadolinium, chromium, ytterbium, nickel, erbium, holmium, praseodymium, thulium, europium, cesium, indium, lutetium.
The invention also provides a preparation method of the tracing sustained-release system, which comprises the following steps: firstly, extruding and granulating a tracer slow-release medium and a tracer by using a double-screw extruder according to a ratio to obtain medium/tracer granules; and then fully stirring the framework material, the mediator/tracer particles, the compatibilizer and the hydrophilic modifier according to the formula, and then preparing the solid tracer with the required shape by melt blending, extrusion molding, cooling and shaping of the materials.
The extrusion granulation temperature is 150-240 ℃, and the screw rotation speed is 30-80 r/min. Further preferably, the extrusion granulation temperature is: the temperature of the first zone is 150-180 ℃, the temperature of the second zone is 180-230 ℃, the temperature of the third zone is 190-240 ℃, and the temperature of the head is 160-190 ℃.
The extrusion molding temperature is 140-240 ℃, and the screw rotating speed is 40-80 r/min. Further preferably, the extrusion molding processing parameters are as follows: the temperature of the first area is 140-180 ℃, the temperature of the second area is 170-230 ℃, the temperature of the third area is 180-240 ℃, and the temperature of the machine head is 150-210 ℃.
The trace element tracer and the mediator material are mixed in advance to achieve the slow release effect of the slow release system on the tracer at the later stage. The direct mixing can cause the phenomenon that the tracer is wrapped by the framework material, so that the tracer can not be effectively released.
The invention also provides application of the tracing slow-release system in water finding of a multi-section fracturing well, and the application method comprises the following steps: the prepared solid tracer is arranged near the perforation position of each fracturing section of an oil pipe or a sieve pipe through a clamping device, then the solid tracer is put into a well along with an oil casing, then the well opening production test of a horizontal well is carried out, the concentration of each tracer is sampled and detected at a well mouth, and the water outlet condition of each section can be determined.
Preferably, the clamping device is a tracer carrying sleeve which is a circular sleeve, the outer side of the sleeve is uniformly provided with caulking groove structures for placing slow release system sample strips, and the clamping device is connected and tightly hooped at the designated position of an oil pipe by using a screw rod when in use. When the oil-water mixed solution flows through the sleeve carrying position, the oil-water mixed solution can be in full contact with the sample strip of the slow-release system, and then carries the released tracer into the oil pipe.
One or more embodiments of the present invention have at least the following technical effects:
the tracer slow-release system provided by the invention can adjust the proportion of the mediator material in the system according to the hydrolysis and microbial degradation rule of the mediator material in the formation water, realizes the controllable release of the tracer, can realize the quick positioning of the water outlet point of a vertical well in a short time, and can also realize the long-term monitoring of the water outlet points of multi-section horizontal wells.
For the production well with water outlet problem, the invention can quickly position the water outlet point and quickly determine the water outlet position. The long-term monitoring of the water outlet points of the multi-section horizontal well is used on a newly developed well, has no water outlet problem, and is well tracked and monitored for the water outlet problem in the later period. Therefore, the mediator materials have different proportions in the system, the rapid detection needs low mediator content, and the rapid hydrolysis or degradation completes the release of the tracer; long-term monitoring requires high mediator content, and can meet long-term release and long-term monitoring effects.
The tracer used by the invention has various types, low cost, high monitoring precision, safety, environmental protection and no influence on the environment.
The tracer system provided by the invention can be prepared into any shape such as solid line shape, long strip shape and the like, and can be prepared at will according to the using conditions.
Drawings
FIG. 1 is an appearance diagram of a solid thread-like slow-release tracer system according to the invention;
FIG. 2 is a schematic diagram of a carrier structure of a tracer sustained-release system;
FIG. 3 is a schematic diagram of the installation position of the tracer sustained-release system;
FIG. 4 shows the slow release effect of the tracer obtained in the example;
FIG. 5 is a comparison of the slow release effects of the tracer obtained in the examples and the comparative examples;
FIG. 6 is a schematic diagram of the installation location of the tracer controlled release system on the tubing;
FIG. 7 shows the results of sampling and analyzing each interval of a horizontal well.
FIG. 8 is a diagram of production before and after water shutoff in a horizontal well.
Detailed Description
The present invention will be further described with reference to the following examples, but is not limited thereto. The test methods described in the following examples are all conventional methods unless otherwise specified; the reagents and materials are commercially available, unless otherwise specified.
Example 1
A slow-release tracing system for finding water in oil-gas well is prepared through drying the components in the formula at 80 deg.C for 12 hr for later processing. Respectively mixing 10 parts by weight of polylactic acid and 5 parts by weight of gadolinium nitrate together, carrying out physical stirring to ensure that the polylactic acid and the gadolinium nitrate are quickly and fully mixed, then carrying out melt blending and extrusion granulation on the polylactic acid and the gadolinium nitrate by using a double-screw extruder, wherein the extrusion processing parameters are as follows: the temperature of the first zone is 150 ℃, the temperature of the second zone is 180 ℃, the temperature of the third zone is 190 ℃, the temperature of a machine head is 170 ℃, the rotating speed of a screw is 40r/min, and the extruded granules are dried in an oven at 80 ℃ for 6 hours. After drying, taking 80 parts by weight of high-density polyethylene (with the density of 0.94-0.96), 3 parts by weight of polyethylene glycol, 2 parts by weight of ethylene-butyl acrylate-glycidyl methacrylate and dried polylactic acid/gadolinium nitrate granules, fully mixing in a stirrer, and then putting the mixture into a double-screw extruder for continuous extrusion molding, wherein the extrusion processing parameters are as follows: the temperature of the first zone is 160 ℃, the temperature of the second zone is 180 ℃, the temperature of the third zone is 185 ℃, the temperature of the machine head is 165 ℃, the rotating speed of the screw is 40r/min, the wire is cooled and shaped, and then the wire is wound under the traction of a traction machine to obtain the tracing slow-release wire, as shown in figure 1. The tracing slow-release wire rod can be conveniently stored and can also be directly bound on the upper surface of the carrier sleeve for use.
Example 2
A slow-release tracing system for water exploration of oil and gas wells and a preparation method thereof comprise the following steps:
firstly, the components in the formula are put into an oven with the temperature of 80 ℃ for drying for 12 hours for later processing.
Respectively mixing 40 parts by weight of polyglycolic acid and 7.5 parts by weight of samarium chloride together, carrying out physical stirring to ensure that the polyglycolic acid and the samarium chloride are quickly and fully mixed, then carrying out melt blending and extrusion granulation on the polyglycolic acid and the samarium chloride by using a double-screw extruder, wherein the extrusion processing parameters are as follows: the temperature of the first zone is 180 ℃, the temperature of the second zone is 225 ℃, the temperature of the third zone is 230 ℃, the temperature of a machine head is 190 ℃, the rotating speed of a screw is 40r/min, and the extruded granules are dried in an oven at 80 ℃ for 6 hours.
After drying, 50 parts by weight of high-density polyethylene (with the density of 0.94-0.96), 5 parts by weight of polyethylene glycol, 2 parts by weight of maleic anhydride grafted ethylene octene copolymer and dried polyglycolic acid/samarium chloride are put into a stirrer to be fully and uniformly mixed, and then the mixture is put into a double-screw extrusion injection molding machine to be subjected to injection molding, wherein the extrusion injection molding processing parameters are as follows: and the temperature of the first area is 165 ℃, the temperature of the second area is 190 ℃, the temperature of the third area is 195 ℃, the temperature of the machine head is 175 ℃, the rotating speed of the screw is 40r/min, cooling and shaping are carried out, and then the mold is opened for sampling to obtain the tracing slow-release strip-shaped sample strip. The spline should be sized to match the carrier nest.
The structure of the tracer carrying sleeve adopted by the embodiment of the invention is shown in figure 2: the connecting structure is characterized by being a circular sleeve, wherein the sleeve is composed of two semicircular structures, the connecting part of the two semicircular structures is connected through a screw rod, and the circular sleeve ring is tightly hooped on the outer side of the specified position of the oil pipe. The outside of the sleeve is evenly provided with a caulking groove structure for placing a slow release system sample strip, as shown in figure 3. When the oil-water mixed solution flows through the sleeve carrying position, the oil-water mixed solution can be in full contact with the sample strip of the slow-release system, and then carries the released tracer into the oil pipe.
Example 3
A slow-release tracing system for water exploration of oil and gas wells and a preparation method thereof comprise the following steps:
firstly, the components in the formula are put into an oven with the temperature of 80 ℃ for drying for 12 hours for later processing.
Respectively mixing 15 parts by weight of polyhydroxybutyrate and 15 parts by weight of erbium chloride together, carrying out physical stirring to ensure that the polyhydroxybutyrate and the erbium chloride are quickly and fully mixed, then carrying out melt blending and extrusion granulation on the polyhydroxybutyrate and the erbium chloride by using a double-screw extruder, wherein the extrusion processing parameters are as follows: the temperature of the first zone is 160 ℃, the temperature of the second zone is 190 ℃, the temperature of the third zone is 195 ℃, the temperature of a machine head is 170 ℃, the rotating speed of a screw is 40r/min, and the extruded granules are dried in an oven at 80 ℃ for 6 hours.
After drying, 60 parts by weight of high-density polyethylene (with the density of 0.94-0.96), 2 parts by weight of polyethylene glycol, 1 part by weight of maleic anhydride grafted ethylene octene copolymer and dried polyhydroxybutyrate/erbium chloride are put into a stirrer to be fully and uniformly mixed, then the mixed material is put into a double-screw extrusion injection molding machine to be subjected to injection molding, and the extrusion injection molding processing parameters are as follows: and the temperature of the first area is 165 ℃, the temperature of the second area is 200 ℃, the temperature of the third area is 205 ℃, the temperature of a machine head is 170 ℃, the rotating speed of a screw is 50r/min, cooling and shaping are carried out, and then the mold is opened for sampling to obtain the tracing slow-release strip-shaped sample strip.
Example 4
A slow-release tracing system for water exploration of oil and gas wells and a preparation method thereof comprise the following steps:
firstly, the components in the formula are put into an oven with the temperature of 80 ℃ for drying for 12 hours for later processing.
Respectively mixing 15 parts by weight of polylactic acid and 10 parts by weight of holmium chloride together, carrying out physical stirring to ensure that the polylactic acid and the holmium chloride are quickly and fully mixed, then carrying out melt blending and extrusion granulation on the polylactic acid and the holmium chloride by using a double-screw extruder, wherein the extrusion processing parameters are as follows: the temperature of the first zone is 160 ℃, the temperature of the second zone is 195 ℃, the temperature of the third zone is 200 ℃, the temperature of a machine head is 170 ℃, the rotating speed of a screw is 40r/min, and the extruded granules are dried in an oven at 80 ℃ for 6 hours.
After drying, taking 70 parts by weight of high-density polyethylene (with the density of 0.94-0.96), 2 parts by weight of polyethylene glycol, 3 parts by weight of ethylene-butyl acrylate-glycidyl methacrylate and dried polylactic acid/holmium chloride, putting the mixture into a stirrer for fully mixing, and then putting the mixture into a double-screw extrusion injection molding machine for injection molding, wherein the extrusion injection molding processing parameters are as follows: and the temperature of the first area is 165 ℃, the temperature of the second area is 185 ℃, the temperature of the third area is 190 ℃, the temperature of a machine head is 170 ℃, the rotating speed of a screw is 45r/min, cooling and shaping are carried out, and then the mold is opened for sampling to obtain the tracing slow-release strip-shaped sample strip.
Example 5
A slow-release tracing system for water exploration of oil and gas wells and a preparation method thereof comprise the following steps:
firstly, the components in the formula are put into an oven with the temperature of 80 ℃ for drying for 12 hours for later processing.
Respectively get 30 parts by weight's polylactic acid and 12 parts by weight's thulium chloride and mix together, carry out the physics and stir and make its quick intensive mixing, then use double screw extruder to carry out melt blending to both, the extrusion processing parameter is: the temperature of the first zone is 160 ℃, the temperature of the second zone is 190 ℃, the temperature of the third zone is 190 ℃, the temperature of a machine head is 170 ℃, the rotating speed of a screw is 40r/min, the mixture is extruded and granulated, and the extruded granules are dried in an oven at 80 ℃ for 6 hours.
After the drying is finished, 55 parts by weight of high-density polyethylene, 5 parts by weight of polyethylene glycol, 2 parts by weight of ethylene-butyl acrylate-glycidyl methacrylate and dried polylactic acid/thulium chloride are put into a stirrer to be fully mixed, then the mixed materials are put into a double-screw extrusion injection molding machine to be subjected to injection molding, and the extrusion injection molding processing parameters are as follows: the temperature of the first area is 165 ℃, the temperature of the second area is 195 ℃, the temperature of the third area is 200 ℃, the temperature of a machine head is 170 ℃, the rotating speed of a screw is 40r/min, cooling and shaping are carried out, and then the mold is opened for sampling to obtain the tracing slow-release strip-shaped sample strip.
Example 6
A slow-release tracing system for water exploration of oil and gas wells and a preparation method thereof comprise the following steps:
firstly, the components in the formula are put into an oven with the temperature of 80 ℃ for drying for 12 hours for later processing.
Respectively mixing 23 parts by weight of polylactic acid and 11 parts by weight of 2, 6-difluorobenzoic acid together, carrying out physical stirring to ensure that the polylactic acid and the 2, 6-difluorobenzoic acid are quickly and fully mixed, and then carrying out melt blending on the polylactic acid and the 2, 6-difluorobenzoic acid by using a double-screw extruder, wherein the extrusion processing parameters are as follows: the temperature of the first zone is 160 ℃, the temperature of the second zone is 185 ℃, the temperature of the third zone is 190 ℃, the temperature of a machine head is 170 ℃, the rotation speed of a screw is 35r/min, extrusion granulation is carried out, and the extruded granules are dried in an oven at 80 ℃ for 6 hours.
After drying, taking 70 parts by weight of high-density polyethylene (with the density of 0.94-0.96), 2 parts by weight of polyethylene glycol, 3 parts by weight of ethylene-butyl acrylate-glycidyl methacrylate and dried polylactic acid/cesium chloride, putting the mixture into a stirrer for fully mixing, and then putting the mixture into a double-screw extrusion injection molding machine for injection molding, wherein the extrusion injection molding processing parameters are as follows: the temperature of the first area is 165 ℃, the temperature of the second area is 180 ℃, the temperature of the third area is 195 ℃, the temperature of the machine head is 175 ℃, the rotating speed of the screw is 50r/min, cooling and shaping are carried out, and then the mould is opened for sampling to obtain the tracing slow-release strip-shaped sample strip.
Examples 1 to 6 were carried out by performing a sustained-release evaluation experiment of a tracer sustained-release system, and the results of tracer sustained release were measured as shown in fig. 4. Different formulations all showed different release effects. In the embodiments 2, 5 and 6, the mass ratio of the mediator material to the tracer is high, the accumulative release speed is slow, and the long-acting monitoring effect in a production well can be met; and as can be seen from the figure, the cumulative release rate curve gradually becomes slow along with the increase of time, and the long-acting stable release of the tracer for 160 days can be realized. In the embodiments 1, 3 and 4, the mediator material and the tracer have low mass and high accumulative release speed, can be quickly released in a short time in a water environment, and are beneficial to the short-term quick confirmation of the downhole water outlet point.
Comparative example 1
Using lanthanum chloride as a tracer to prepare a slow-release tracer system, respectively mixing 40 parts by weight of polylactic acid and 7.5 parts by weight of lanthanum chloride together, carrying out physical stirring to ensure that the polylactic acid and the lanthanum chloride are quickly and fully mixed, then carrying out melt blending on the polylactic acid and the lanthanum chloride by using a double-screw extruder, wherein the extrusion processing parameters are as follows: the temperature of the first zone is 150 ℃, the temperature of the second zone is 180 ℃, the temperature of the third zone is 190 ℃, the temperature of a machine head is 170 ℃, the rotating speed of a screw is 40r/min, and extrusion granulation is carried out. However, due to the strong catalytic cracking effect of the rare earth lanthanum element, the mediator material is seriously degraded in the processing process, so that the composite material obtained by extrusion is carbonized, and the use requirement of a slow release system cannot be met.
Comparative example 2
A slow-release tracing system for water exploration of oil and gas wells and a preparation method thereof comprise the following steps:
firstly, the components in the formula are put into an oven with the temperature of 80 ℃ for drying for 12 hours for later processing.
Respectively mixing 5 parts by weight of polylactic acid and 5 parts by weight of holmium chloride together, carrying out physical stirring to ensure that the polylactic acid and the holmium chloride are quickly and fully mixed, then carrying out melt blending and extrusion granulation on the polylactic acid and the holmium chloride by using a double-screw extruder, wherein the extrusion processing parameters are as follows: the temperature of the first zone is 160 ℃, the temperature of the second zone is 195 ℃, the temperature of the third zone is 200 ℃, the temperature of a machine head is 170 ℃, the rotating speed of a screw is 40r/min, and the extruded granules are dried in an oven at 80 ℃ for 6 hours.
After drying, taking 70 parts by weight of high-density polyethylene (with the density of 0.94-0.96), 2 parts by weight of polyethylene glycol, 3 parts by weight of ethylene-butyl acrylate-glycidyl methacrylate and the dried polylactic acid/holmium chloride granules, putting the mixture into a double-screw extrusion injection molding machine for injection molding, wherein the extrusion injection molding processing parameters are as follows: and the temperature of the first area is 165 ℃, the temperature of the second area is 185 ℃, the temperature of the third area is 190 ℃, the temperature of a machine head is 170 ℃, the rotating speed of a screw is 45r/min, cooling and shaping are carried out, and then the mold is opened for sampling to obtain the tracing slow-release strip-shaped sample strip. The sample band was subjected to a sustained-release evaluation experiment of a sustained-release system, and the operation and detection were carried out according to experiment 1. The results show that under the same monitoring time, the tracer is coated by the framework material due to the fact that the proportion of the mediator material in the tracer composite system is too low, the detected concentration of the tracer is very low, the release is slow, and the use requirement cannot be met.
Comparative example 3
A slow-release tracing system for water exploration of oil and gas wells and a preparation method thereof comprise the following steps:
firstly, the components in the formula are put into an oven with the temperature of 80 ℃ for drying for 12 hours for later processing. Respectively mixing 15 parts by weight of polyvinyl alcohol and 10 parts by weight of holmium chloride together, carrying out physical stirring to ensure that the polyvinyl alcohol and the holmium chloride are quickly and fully mixed, and then carrying out melt blending on the polyvinyl alcohol and the holmium chloride by using a double-screw extruder, wherein the extrusion processing parameters are as follows: the temperature of the first zone is 160 ℃, the temperature of the second zone is 195 ℃, the temperature of the third zone is 200 ℃, the temperature of a machine head is 170 ℃, the rotating speed of a screw is 40r/min, the mixture is extruded and granulated, and the extruded granules are dried in an oven at 80 ℃ for 6 hours.
After drying, taking 70 parts by weight of high-density polyethylene, 2 parts by weight of polyethylene glycol, 3 parts by weight of ethylene-butyl acrylate-glycidyl methacrylate and dried polyvinyl alcohol/holmium chloride, putting the mixture into a stirrer for fully mixing, and then putting the mixture into a double-screw extrusion injection molding machine for injection molding, wherein the extrusion injection molding processing parameters are as follows: and the temperature of the first area is 165 ℃, the temperature of the second area is 185 ℃, the temperature of the third area is 190 ℃, the temperature of a machine head is 170 ℃, the rotating speed of a screw is 45r/min, cooling and shaping are carried out, and then the mold is opened for sampling to obtain the tracing slow-release strip-shaped sample strip. The sample strip is used for carrying out a slow release evaluation experiment of a slow release system, and operation and detection are carried out according to experiment 1. The result shows that in water environment, especially high temperature water environment, under short monitoring time, the trace element is released quickly due to the high temperature water solubility of the polyvinyl alcohol, and the monitoring effect can not be achieved.
Comparative example 4
All materials were mixed and extruded according to the formulation of example 4. The results show that after a short period of tracer release, it is essentially not released at a later time, because the one-step mixing allows the tracer to be thoroughly mixed with the matrix material, most of the tracer is embedded in the matrix material, and only the tracer exposed on the surface and in contact with the mediator material is released, greatly affecting the effectiveness of the release. Comparative examples 2 to 4 were tested according to the method of the slow release evaluation experiment of the tracer slow release system, and the slow release results are shown in fig. 5.
Slow release evaluation experiment of tracer slow release system
The sustained-release systems prepared in the examples and comparative examples of the present invention were prepared into sample strips, which were placed in a Schott bottle containing 200mL of distilled water and placed at 90 ℃. Samples were taken every day for the first 5 days, every 10 days thereafter, measurements were continued, and the distilled water in the flask was replaced after each sampling. The concentration of trace elements in water was analyzed using an inductively coupled plasma mass spectrometer.
Field embodiment
Because the production period is too long, the water yield is increased, the monitoring and positioning of a water outlet layer section are needed, and the working conditions of the well are as follows: the well depth is 4816m, the vertical depth is 2416.48 m, and the horizontal section is 2261.53 m; the formation temperature is 90 ℃, and the mineralization degree is 10 ten thousand mg/L.
The solid slow-release system is utilized to monitor the water outlet point of a horizontal well, and the specific design is shown in figure 6.
1. Selecting six different types of solid slow-release tracers according to six intervals of the horizontal well;
DW-1 to DW-6 respectively correspond to six tracers of ytterbium, erbium, holmium, thulium, europium and cesium, and other formula compositions of a slow release system and a sample band preparation method are shown in example 3. Different from the metal salt, the metal salt is respectively selected from ytterbium chloride, erbium chloride, holmium chloride, thulium chloride, europium chloride and cesium chloride.
2. After the well is stopped, different solid slow-release tracers are arranged on the pipe column for well descending operation, and the different tracers are positioned near the perforation positions of the oil pipes in different intervals;
3. sampling is carried out after the well is opened to produce liquid, sampling is carried out every 1 hour for the first 12 hours, sampling is carried out every 12-72 hours and every 8 hours, and sampling is carried out 20 times in total. The results of sampling analysis of each interval are shown in fig. 7.
As can be seen from fig. 7:
1) by monitoring the produced liquid in each layer section for 72h, the 2 nd layer section is the main water producing section of the horizontal well, and the 6 th layer section also has a certain water producing condition;
2) in order to optimize oil well exploitation, the 2 nd and 6 th stratum conditions are suggested to be analyzed, and water shutoff and profile control measures are adopted, so that stratum water yielding is reduced, and oil yield is improved.
3) According to the guidance and suggestion, after the well adopts water shutoff profile control measures, the production condition is shown in figure 8, the water content of produced liquid is obviously reduced, the daily oil production is obviously improved, and the slow-release tracing system is used for quickly positioning a water outlet point and has good effect.
Although the embodiments of the present invention have been described in conjunction with the examples, it is not intended to limit the scope of the present invention, and it should be understood that various modifications and variations can be made by those skilled in the art without inventive faculty based on the technical solutions of the present invention.
Claims (10)
1. A tracing slow-release system for water exploration of oil and gas wells is characterized by comprising a tracing agent slow-release mediator accounting for 10-40% of the mass fraction, a tracing agent accounting for 5-15% of the mass fraction, a framework material accounting for 50-80% of the mass fraction, a compatibilizer accounting for 1-3% of the mass fraction, and a hydrophilic modifier accounting for 2-5% of the mass fraction.
2. The tracer sustained release system according to claim 1, wherein the tracer sustained release medium is a polymer material capable of realizing slow degradation under formation conditions, and comprises one or more of polylactic acid, polyglycolic acid, poly (glycolide-co-lactide), poly (butylene succinate), polycaprolactone, polyhydroxyvalerate, and polyhydroxybutyrate; more preferably, the sustained-release mediator is one or more of polylactic acid, polyglycolic acid, and polyhydroxybutyrate.
3. Tracer-sustained release system according to claim 1, wherein the tracer is a water-soluble salt of a trace metal element or a fluorobenzoic acid compound, preferably the tracer is a water-soluble salt of a trace metal element.
4. The tracer sustained release system of claim 3, wherein the water soluble salt of a trace metal element is an anhydrous chloride or nitrate salt of samarium, zirconium, titanium, cadmium, yttrium, cobalt, gadolinium, chromium, ytterbium, nickel, erbium, holmium, praseodymium, thulium, europium, cesium, indium, lutetium.
5. The tracer sustained-release system according to claim 1, wherein the matrix material is a polymer material with a molecular weight of 40000-300000, preferably high-density polyethylene.
6. The tracer sustained-release system according to claim 1, wherein the compatibilizer is one or more of an ethylene-butyl acrylate-glycidyl methacrylate copolymer, a maleic anhydride grafted ethylene octene copolymer, and a maleic anhydride grafted propylene copolymer, and more preferably, the compatibilizer is an ethylene-butyl acrylate-glycidyl methacrylate copolymer.
7. The tracer sustained-release system according to any one of claims 1 to 6, wherein the hydrophilic modifier is polyethylene glycol with a degree of polymerization of 200 to 600, preferably the hydrophilic modifier is polyethylene glycol with a degree of polymerization of 200.
8. A preparation method of the tracing slow-release system of any one of claims 1 to 7 is characterized by comprising the following steps: firstly, extruding and granulating a tracer slow-release medium and a tracer by using a double-screw extruder according to a ratio to obtain medium/tracer granules; and then fully stirring the framework material, the mediator/tracer particles, the compatibilizer and the hydrophilic modifier according to the formula, and preparing the solid tracer with the required shape by melt blending, extrusion molding, cooling and shaping of the materials.
Preferably, the extrusion granulation temperature is 150-240 ℃, and the screw rotation speed is 30-80 r/min. The extrusion molding temperature is 140-240 ℃, and the screw rotation speed is 40-80 r/min.
9. The application of the tracing slow-release system of any one of claims 1 to 7 in water finding of a multi-section fractured well is characterized in that the application method comprises the following steps: the prepared solid tracer is arranged near the perforation position of each fracturing section of an oil pipe or a sieve pipe through a clamping device, and is put into a well along with an oil casing, the concentration of each tracer is sampled and detected at a well mouth, and the water outlet condition of each section is determined.
10. The application of claim 9, wherein the clamping device is a circular sleeve composed of two semicircular structures, the outer side of the sleeve is uniformly provided with caulking groove structures for placing slow release system splines, and the two semicircular structures are tightly hooped on the outer side of the designated position of the oil pipe by using a screw rod when in use; when the oil-water mixed solution flows through the sleeve carrying position, the oil-water mixed solution can be in full contact with the sample strip of the slow-release system, and then carries the released tracer into the oil pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010820161.0A CN111911139A (en) | 2020-08-14 | 2020-08-14 | Slow-release tracing controllable system for water exploration of oil and gas well, preparation method and application |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010820161.0A CN111911139A (en) | 2020-08-14 | 2020-08-14 | Slow-release tracing controllable system for water exploration of oil and gas well, preparation method and application |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111911139A true CN111911139A (en) | 2020-11-10 |
Family
ID=73283172
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010820161.0A Pending CN111911139A (en) | 2020-08-14 | 2020-08-14 | Slow-release tracing controllable system for water exploration of oil and gas well, preparation method and application |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111911139A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112878983A (en) * | 2021-01-06 | 2021-06-01 | 北京合力奇点科技有限公司 | Intelligent production dynamic monitoring flow-regulating water-controlling well completion method for oil and gas well |
| CN113653486A (en) * | 2021-09-03 | 2021-11-16 | 捷贝通石油技术集团股份有限公司 | Slow-release type long-acting tracer and preparation method thereof |
| CN115614028A (en) * | 2021-07-13 | 2023-01-17 | 西安思坦油气工程服务有限公司 | Tracer water finding tool and tracer liquid production profile water finding method |
| US12140021B2 (en) | 2023-04-04 | 2024-11-12 | Saudi Arabian Oil Company | Polymer-based well tracers with tunable release profile |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2492540A1 (en) * | 1980-10-17 | 1982-04-23 | Schlumberger Prospection | DEVICE FOR ELECTROMAGNETIC DIAGRAPHY IN DRILLING |
| US20070061093A1 (en) * | 2005-08-27 | 2007-03-15 | Schlumberger Technology Corporation | Time-of-flight stochastic correlation measurements |
| CN102296947A (en) * | 2011-05-30 | 2011-12-28 | 中国海洋石油总公司 | Instant trace element tracer for oil field and preparation method thereof |
| CN103834086A (en) * | 2014-03-19 | 2014-06-04 | 华南农业大学 | Efficient controllable photooxidation-biodegradable plastic film and preparation method thereof |
| CN103946336A (en) * | 2011-11-22 | 2014-07-23 | 贝克休斯公司 | Method of using controlled release tracers |
| CN104018822A (en) * | 2014-05-23 | 2014-09-03 | 中国石油化工股份有限公司江汉油田分公司采油工艺研究院 | Oil well staged fracturing effect monitoring method |
| CN104845315A (en) * | 2014-11-22 | 2015-08-19 | 青岛同创节能环保工程有限公司 | Reinforced polycarbonatepolyethylene glycol terephthalate alloy |
| US20160230543A1 (en) * | 2013-09-05 | 2016-08-11 | Johnson Matthey Public Limited Company | Tracer and method |
| US20170306217A1 (en) * | 2016-04-20 | 2017-10-26 | Spectrum Tracer Services, Llc | Method and compositions for hydraulic fracturing and for tracing formation water |
| CN108729909A (en) * | 2018-06-01 | 2018-11-02 | 青岛大地新能源技术研究院 | A method of utilizing Uranium determination agent level monitoring well staged fracturing effect |
| CN110541704A (en) * | 2019-09-10 | 2019-12-06 | 大庆亿莱检验检测技术服务有限公司 | method for evaluating staged water yield of compact oil multi-stage fracturing well by using tracer |
-
2020
- 2020-08-14 CN CN202010820161.0A patent/CN111911139A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2492540A1 (en) * | 1980-10-17 | 1982-04-23 | Schlumberger Prospection | DEVICE FOR ELECTROMAGNETIC DIAGRAPHY IN DRILLING |
| US20070061093A1 (en) * | 2005-08-27 | 2007-03-15 | Schlumberger Technology Corporation | Time-of-flight stochastic correlation measurements |
| CN102296947A (en) * | 2011-05-30 | 2011-12-28 | 中国海洋石油总公司 | Instant trace element tracer for oil field and preparation method thereof |
| CN103946336A (en) * | 2011-11-22 | 2014-07-23 | 贝克休斯公司 | Method of using controlled release tracers |
| US20160230543A1 (en) * | 2013-09-05 | 2016-08-11 | Johnson Matthey Public Limited Company | Tracer and method |
| CN103834086A (en) * | 2014-03-19 | 2014-06-04 | 华南农业大学 | Efficient controllable photooxidation-biodegradable plastic film and preparation method thereof |
| CN104018822A (en) * | 2014-05-23 | 2014-09-03 | 中国石油化工股份有限公司江汉油田分公司采油工艺研究院 | Oil well staged fracturing effect monitoring method |
| CN104845315A (en) * | 2014-11-22 | 2015-08-19 | 青岛同创节能环保工程有限公司 | Reinforced polycarbonatepolyethylene glycol terephthalate alloy |
| US20170306217A1 (en) * | 2016-04-20 | 2017-10-26 | Spectrum Tracer Services, Llc | Method and compositions for hydraulic fracturing and for tracing formation water |
| CN108729909A (en) * | 2018-06-01 | 2018-11-02 | 青岛大地新能源技术研究院 | A method of utilizing Uranium determination agent level monitoring well staged fracturing effect |
| CN110541704A (en) * | 2019-09-10 | 2019-12-06 | 大庆亿莱检验检测技术服务有限公司 | method for evaluating staged water yield of compact oil multi-stage fracturing well by using tracer |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112878983A (en) * | 2021-01-06 | 2021-06-01 | 北京合力奇点科技有限公司 | Intelligent production dynamic monitoring flow-regulating water-controlling well completion method for oil and gas well |
| CN115614028A (en) * | 2021-07-13 | 2023-01-17 | 西安思坦油气工程服务有限公司 | Tracer water finding tool and tracer liquid production profile water finding method |
| CN113653486A (en) * | 2021-09-03 | 2021-11-16 | 捷贝通石油技术集团股份有限公司 | Slow-release type long-acting tracer and preparation method thereof |
| US12140021B2 (en) | 2023-04-04 | 2024-11-12 | Saudi Arabian Oil Company | Polymer-based well tracers with tunable release profile |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111911139A (en) | Slow-release tracing controllable system for water exploration of oil and gas well, preparation method and application | |
| US4643255A (en) | Gel and process for preventing loss of circulation, and combination process for enhanced recovery | |
| EP1774137B1 (en) | System for delivery of a tracer in fluid transport systems and use thereof | |
| CA2842401C (en) | Improved polymer compositions for use in downhole tools and components thereof | |
| CN1918361A (en) | Suppressing fluid communication to or from a wellbore | |
| CN107575186B (en) | It is a kind of to cross screen casing sand-preventing process | |
| WO1995018909A1 (en) | Hydrocarbon recovery process utilizing a gel prepared from a polymer and a preformed crosslinking agent | |
| CN110617041A (en) | Water injection well water absorption profile adjusting sleeve and adjusting method | |
| CN113201855B (en) | Full-degradable high-strength temporary knot plug | |
| CN104194754A (en) | Temperature-resistant salt-resistant HPAM/Cr<3+>/phenolic aldehyde compound crosslinked weak gel profile adjusting and water plugging agent and preparation method thereof | |
| CA1244584A (en) | Prepartially crosslinked gel for retarding fluid flow | |
| CN110591684A (en) | Two-phase temperature response phase change fracturing fluid system | |
| CN102558469A (en) | Cross-linking agent for profile control and oil displacement for high-temperature oil reservoir, as well as preparation method and application for same | |
| CN109097014A (en) | Underground cross-linking type resin plugging agent capable of being prepared from seawater and application thereof | |
| CN104446485B (en) | A kind of hud typed radioactive label carborundum pressure break proppant production method | |
| CN102796503B (en) | Intercalation polymer gel diverting agent | |
| CN115873567A (en) | High-temperature-resistant intelligent expansion core-shell plugging agent and preparation method and application thereof | |
| GB2145420A (en) | Gel and process for retarding fluid flow | |
| CN1270967A (en) | Preparation of deep modifier for cross-linked polymer solution (LPS) | |
| CN103808632A (en) | Rheometer-based method for testing temperature-resisting and shearing-resisting performance of fracturing fluid | |
| CN114316120B (en) | Coated propping tracer containing rare earth metal elements and preparation method and application thereof | |
| CN115558478B (en) | Preparation method of high-strength full-degradable bionic temporary plugging material | |
| US20230117956A1 (en) | An oil field chemical release system | |
| US20240337183A1 (en) | Polymer-based well tracers with tunable release profile | |
| US12140021B2 (en) | Polymer-based well tracers with tunable release profile |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20201110 |