CN115288649B - Tracer system for coalbed methane reservoir and coalbed methane horizontal well fracturing monitoring method - Google Patents
Tracer system for coalbed methane reservoir and coalbed methane horizontal well fracturing monitoring method Download PDFInfo
- Publication number
- CN115288649B CN115288649B CN202210921318.8A CN202210921318A CN115288649B CN 115288649 B CN115288649 B CN 115288649B CN 202210921318 A CN202210921318 A CN 202210921318A CN 115288649 B CN115288649 B CN 115288649B
- Authority
- CN
- China
- Prior art keywords
- tracer
- fracturing
- tracer system
- chloride
- rare earth
- 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.)
- Active
Links
- 239000000700 radioactive tracer Substances 0.000 title claims abstract description 158
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 72
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000012544 monitoring process Methods 0.000 title claims abstract description 22
- 239000012530 fluid Substances 0.000 claims abstract description 44
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 43
- 239000008139 complexing agent Substances 0.000 claims abstract description 28
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 19
- 150000001805 chlorine compounds Chemical class 0.000 claims abstract description 15
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 34
- 239000013530 defoamer Substances 0.000 claims description 17
- 238000010276 construction Methods 0.000 claims description 15
- SEGLCEQVOFDUPX-UHFFFAOYSA-N di-(2-ethylhexyl)phosphoric acid Chemical group CCCCC(CC)COP(O)(=O)OCC(CC)CCCC SEGLCEQVOFDUPX-UHFFFAOYSA-N 0.000 claims description 13
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 claims description 11
- 239000003638 chemical reducing agent Substances 0.000 claims description 11
- UEUXEKPTXMALOB-UHFFFAOYSA-J tetrasodium;2-[2-[bis(carboxylatomethyl)amino]ethyl-(carboxylatomethyl)amino]acetate Chemical compound [Na+].[Na+].[Na+].[Na+].[O-]C(=O)CN(CC([O-])=O)CCN(CC([O-])=O)CC([O-])=O UEUXEKPTXMALOB-UHFFFAOYSA-J 0.000 claims description 11
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 10
- 229920001296 polysiloxane Polymers 0.000 claims description 8
- 238000007127 saponification reaction Methods 0.000 claims description 8
- 150000001298 alcohols Chemical class 0.000 claims description 7
- 230000000694 effects Effects 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 7
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 6
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 6
- OBOSXEWFRARQPU-UHFFFAOYSA-N 2-n,2-n-dimethylpyridine-2,5-diamine Chemical compound CN(C)C1=CC=C(N)C=N1 OBOSXEWFRARQPU-UHFFFAOYSA-N 0.000 claims description 5
- HDGGAKOVUDZYES-UHFFFAOYSA-K erbium(iii) chloride Chemical compound Cl[Er](Cl)Cl HDGGAKOVUDZYES-UHFFFAOYSA-K 0.000 claims description 5
- ICAKDTKJOYSXGC-UHFFFAOYSA-K lanthanum(iii) chloride Chemical compound Cl[La](Cl)Cl ICAKDTKJOYSXGC-UHFFFAOYSA-K 0.000 claims description 5
- ATINCSYRHURBSP-UHFFFAOYSA-K neodymium(iii) chloride Chemical compound Cl[Nd](Cl)Cl ATINCSYRHURBSP-UHFFFAOYSA-K 0.000 claims description 5
- LHBNLZDGIPPZLL-UHFFFAOYSA-K praseodymium(iii) chloride Chemical compound Cl[Pr](Cl)Cl LHBNLZDGIPPZLL-UHFFFAOYSA-K 0.000 claims description 5
- BHXBZLPMVFUQBQ-UHFFFAOYSA-K samarium(iii) chloride Chemical compound Cl[Sm](Cl)Cl BHXBZLPMVFUQBQ-UHFFFAOYSA-K 0.000 claims description 5
- PYOOBRULIYNHJR-UHFFFAOYSA-K trichloroholmium Chemical compound Cl[Ho](Cl)Cl PYOOBRULIYNHJR-UHFFFAOYSA-K 0.000 claims description 5
- CKLHRQNQYIJFFX-UHFFFAOYSA-K ytterbium(III) chloride Chemical compound [Cl-].[Cl-].[Cl-].[Yb+3] CKLHRQNQYIJFFX-UHFFFAOYSA-K 0.000 claims description 5
- 229920002401 polyacrylamide Polymers 0.000 claims description 4
- 239000003109 Disodium ethylene diamine tetraacetate Substances 0.000 claims description 3
- 229910019142 PO4 Inorganic materials 0.000 claims description 3
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 3
- 230000002378 acidificating effect Effects 0.000 claims description 3
- 235000019301 disodium ethylene diamine tetraacetate Nutrition 0.000 claims description 3
- 239000010452 phosphate Substances 0.000 claims description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 3
- 229920000570 polyether Polymers 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 235000017557 sodium bicarbonate Nutrition 0.000 claims description 3
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 3
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 3
- 239000000230 xanthan gum Substances 0.000 claims description 3
- 235000010493 xanthan gum Nutrition 0.000 claims description 3
- 229920001285 xanthan gum Polymers 0.000 claims description 3
- 229940082509 xanthan gum Drugs 0.000 claims description 3
- GAOHSIPOAWYZMQ-UHFFFAOYSA-N 2-ethylhexyl octan-3-yl hydrogen phosphate Chemical compound CCCCCC(CC)OP(=O)(O)OCC(CC)CCCC GAOHSIPOAWYZMQ-UHFFFAOYSA-N 0.000 claims description 2
- 229920002907 Guar gum Polymers 0.000 claims description 2
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 2
- 239000002518 antifoaming agent Substances 0.000 claims description 2
- 239000000665 guar gum Substances 0.000 claims description 2
- 235000010417 guar gum Nutrition 0.000 claims description 2
- 229960002154 guar gum Drugs 0.000 claims description 2
- 239000003245 coal Substances 0.000 abstract description 31
- 238000001179 sorption measurement Methods 0.000 abstract description 22
- 235000013619 trace mineral Nutrition 0.000 abstract description 15
- 239000011573 trace mineral Substances 0.000 abstract description 15
- 238000012360 testing method Methods 0.000 abstract description 12
- 239000006260 foam Substances 0.000 abstract description 6
- 238000005086 pumping Methods 0.000 abstract description 3
- 230000000630 rising effect Effects 0.000 abstract description 3
- 239000000243 solution Substances 0.000 description 27
- 239000013049 sediment Substances 0.000 description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 12
- 239000011259 mixed solution Substances 0.000 description 11
- 239000000126 substance Substances 0.000 description 11
- 238000002474 experimental method Methods 0.000 description 7
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 229960001484 edetic acid Drugs 0.000 description 5
- 239000003921 oil Substances 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 230000000977 initiatory effect Effects 0.000 description 3
- 230000014759 maintenance of location Effects 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000012216 screening Methods 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- 239000007858 starting material Substances 0.000 description 3
- IINACGXCEZNYTF-UHFFFAOYSA-K trichloroyttrium;hexahydrate Chemical compound O.O.O.O.O.O.[Cl-].[Cl-].[Cl-].[Y+3] IINACGXCEZNYTF-UHFFFAOYSA-K 0.000 description 3
- LOXWVAXWPZWIOO-UHFFFAOYSA-N 7-bromo-1-chloronaphthalene Chemical compound C1=C(Br)C=C2C(Cl)=CC=CC2=C1 LOXWVAXWPZWIOO-UHFFFAOYSA-N 0.000 description 2
- 229910052779 Neodymium Inorganic materials 0.000 description 2
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 2
- 229910052777 Praseodymium Inorganic materials 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 239000008398 formation water Substances 0.000 description 2
- 238000009616 inductively coupled plasma Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000009545 invasion Effects 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 229910052746 lanthanum Inorganic materials 0.000 description 2
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 description 2
- CWDUIOHBERXKIX-UHFFFAOYSA-K lanthanum(3+);trichloride;hexahydrate Chemical compound O.O.O.O.O.O.[Cl-].[Cl-].[Cl-].[La+3] CWDUIOHBERXKIX-UHFFFAOYSA-K 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 description 2
- 235000006408 oxalic acid Nutrition 0.000 description 2
- PUDIUYLPXJFUGB-UHFFFAOYSA-N praseodymium atom Chemical compound [Pr] PUDIUYLPXJFUGB-UHFFFAOYSA-N 0.000 description 2
- HZYWHLVESVMEHZ-UHFFFAOYSA-K praseodymium(3+);trichloride;hexahydrate Chemical compound O.O.O.O.O.O.[Cl-].[Cl-].[Cl-].[Pr+3] HZYWHLVESVMEHZ-UHFFFAOYSA-K 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 230000002285 radioactive effect Effects 0.000 description 2
- -1 rare earth chloride Chemical class 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- UJBPGOAZQSYXNT-UHFFFAOYSA-K trichloroerbium;hexahydrate Chemical compound O.O.O.O.O.O.[Cl-].[Cl-].[Cl-].[Er+3] UJBPGOAZQSYXNT-UHFFFAOYSA-K 0.000 description 2
- BUQFCXABQYNXLP-UHFFFAOYSA-K trichloroholmium;hexahydrate Chemical compound O.O.O.O.O.O.Cl[Ho](Cl)Cl BUQFCXABQYNXLP-UHFFFAOYSA-K 0.000 description 2
- TXVNDKHBDRURNU-UHFFFAOYSA-K trichlorosamarium;hexahydrate Chemical compound O.O.O.O.O.O.[Cl-].[Cl-].[Cl-].[Sm+3] TXVNDKHBDRURNU-UHFFFAOYSA-K 0.000 description 2
- LEYFXTUKPKKWMP-UHFFFAOYSA-K trichloroytterbium;hexahydrate Chemical compound O.O.O.O.O.O.Cl[Yb](Cl)Cl LEYFXTUKPKKWMP-UHFFFAOYSA-K 0.000 description 2
- 229910052727 yttrium Inorganic materials 0.000 description 2
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 description 2
- KFDNQUWMBLVQNB-UHFFFAOYSA-N 2-[2-[bis(carboxymethyl)amino]ethyl-(carboxymethyl)amino]acetic acid;sodium Chemical compound [Na].[Na].[Na].[Na].OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KFDNQUWMBLVQNB-UHFFFAOYSA-N 0.000 description 1
- 241001248531 Euchloe <genus> Species 0.000 description 1
- 150000000922 Holmium Chemical class 0.000 description 1
- 229910000858 La alloy Inorganic materials 0.000 description 1
- 229910052772 Samarium Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910001870 ammonium persulfate Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000002612 dispersion medium Substances 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- ZUNLRMXHVJDCME-UHFFFAOYSA-N erbium Chemical compound [Er].[Er] ZUNLRMXHVJDCME-UHFFFAOYSA-N 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000001095 inductively coupled plasma mass spectrometry Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000004811 liquid chromatography Methods 0.000 description 1
- 238000004949 mass spectrometry Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000001103 potassium chloride Substances 0.000 description 1
- 235000011164 potassium chloride Nutrition 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- KZUNJOHGWZRPMI-UHFFFAOYSA-N samarium atom Chemical compound [Sm] KZUNJOHGWZRPMI-UHFFFAOYSA-N 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000013112 stability test Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 229910021642 ultra pure water Inorganic materials 0.000 description 1
- 239000012498 ultrapure water Substances 0.000 description 1
- RGUOAJCERXRZDG-UHFFFAOYSA-N ytterbium Chemical compound [Yb].[Yb] RGUOAJCERXRZDG-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/10—Locating fluid leaks, intrusions or movements
- E21B47/11—Locating fluid leaks, intrusions or movements using tracers; using radioactivity
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics (AREA)
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention relates to the technical field of coalbed methane exploitation, in particular to a tracer system for a coalbed methane reservoir and a coalbed methane horizontal well fracturing monitoring method. The tracer system comprises: chlorides of rare earth elements, complexing agents, extractants and saponifying agents. The fracturing monitoring method for the coal bed methane horizontal well comprises the step of monitoring fracturing flowback fluid of the coal bed methane horizontal well by adopting the tracer system. The adsorption rate of the tracer system in the coal seam is only 10-20%, so that the requirements of layered test and multistage fracturing test of the coal seam gas horizontal well can be well met; good compatibility with fracturing fluid, good stability, no interference of trace elements; the use safety is good, the operation is convenient, no obvious foam is generated in the use process, and the problem of sleeve pressure rising caused in the process of pumping the tracer into the stratum can be solved.
Description
Technical Field
The invention relates to the technical field of coalbed methane exploitation, in particular to a tracer system for a coalbed methane reservoir and a coalbed methane horizontal well fracturing monitoring method.
Background
After the unconventional oil and gas reservoirs (coal bed gas, dense gas, shale gas and the like) are subjected to horizontal drilling, segmented multi-cluster perforation operation and large-scale volume fracturing transformation, the diversion capacity or dominant channel segments are not clear, the tracer segmented monitoring technology becomes an important means for evaluating the volume fracturing effect and the fracture state of the horizontal well, the research of the technology is mainly carried out on an oil reservoir at present, the used tracer is also developed into a trace substance tracer with high precision, low cost, safety and stability from an initial low-precision and large-dosage chemical tracer, a radioactive isotope tracer and a non-radioactive isotope tracer, and has been well applied and developed in the water injection development of oil fields.
For the segment monitoring of coalbed methane reservoirs, the existing tracers have the following problems: (1) The traditional chemical tracer has the defects of high construction risk and poor qualitative measurement; (2) As the number of the intervals of staged fracturing of the horizontal well increases, the types of the stable isotope tracers are few, the cost is high, the detection method is complex, and the method cannot be well applied to a coalbed methane reservoir; (3) After the multi-section fracturing of the coal-bed gas well is finished, the flowback of the fracturing fluid is little, even no, the flow conductivity of each fracturing section can be evaluated only in the production stage of drainage gas production, so that the retention time of the tracer in the reservoir is long, the coal bed has strong adsorptivity, the adsorption quantity of the trace substance tracer in the coal bed is suddenly increased, and the use requirement is difficult to meet.
At present, trace substance tracer researches on coal bed gas reservoirs are few, and the provision of a novel trace substance tracer system suitable for the high-adsorption coal bed gas reservoirs has become a key problem to be solved urgently.
Disclosure of Invention
The invention aims to solve the problem that the existing tracer is difficult to meet the use requirement of staged monitoring of a coalbed methane reservoir, and provides a tracer system for the coalbed methane reservoir and a fracturing monitoring method for a coalbed methane horizontal well.
To achieve the above object, a first aspect of the present invention provides a tracer system for a coal-bed gas reservoir, comprising: chlorides of rare earth elements, complexing agents, extractants and saponifying agents; wherein,
the rare earth element chloride is selected from at least one of yttrium chloride, lanthanum chloride, praseodymium chloride, neodymium chloride, samarium chloride, holmium chloride, erbium chloride and ytterbium chloride;
the complexing agent is at least one of ethylenediamine tetraacetic acid, disodium ethylenediamine tetraacetate and tetrasodium ethylenediamine tetraacetate;
the extractant is an acidic phosphate extractant; the saponifier is at least one selected from sodium hydroxide, sodium carbonate and sodium bicarbonate.
The second aspect of the invention provides a fracturing monitoring method for a coal bed methane horizontal well, wherein the method comprises the step of monitoring fracturing flowback fluid of the coal bed methane horizontal well by adopting the tracer system in the first aspect.
Through the technical scheme, the invention has the following beneficial effects:
(1) The trace substance tracer system formed by the common participation of the chlorides of rare earth elements, the complexing agent, the extractant and the saponifier is provided, the adsorption quantity of the tracer system in a coal seam is small, the adsorption rate is only 10-20%, and the trace substance tracer system can meet the industry standard of tracer screening under the condition of small tracer dosage;
(2) The tracer system comprises a plurality of tracer types, so that the requirements of layered test and multistage fracturing test of the coalbed methane horizontal well can be met; good compatibility with fracturing fluid, good stability, no interference of trace elements;
(3) The tracer system does not generate obvious foam in the process of dissolving into the fracturing fluid, can overcome the problem of casing pressure rising caused by the tracer in the process of pumping into the stratum, and has less foam in the flowback fluid;
(4) The use safety is good, the operation is convenient, and the method is suitable for the fracturing construction environment.
Detailed Description
The endpoints and any values of the ranges disclosed herein are not limited to the precise range or value, and are understood to encompass values approaching those ranges or values. For numerical ranges, one or more new numerical ranges may be found between the endpoints of each range, between the endpoint of each range and the individual point value, and between the individual point value, in combination with each other, and are to be considered as specifically disclosed herein.
The following describes specific embodiments of the present invention in detail. It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention.
A first aspect of the invention provides a tracer system for a coal bed gas reservoir comprising: chlorides of rare earth elements, complexing agents, extractants and saponifying agents; wherein,
the rare earth element chloride is selected from at least one of yttrium chloride, lanthanum chloride, praseodymium chloride, neodymium chloride, samarium chloride, holmium chloride, erbium chloride and ytterbium chloride;
the complexing agent is at least one of ethylenediamine tetraacetic acid, disodium ethylenediamine tetraacetate and tetrasodium ethylenediamine tetraacetate;
the extractant is an acidic phosphate extractant; the saponifier is at least one selected from sodium hydroxide, sodium carbonate and sodium bicarbonate.
According to the invention, in the tracer system for the coal bed gas reservoir, the trace substance tracer selected is a chloride of a rare earth element, wherein the rare earth element is used as the tracer element.
According to the present invention, specifically, the yttrium chloride, lanthanum chloride, praseodymium chloride, neodymium chloride, samarium chloride, holmium chloride, erbium chloride, and ytterbium chloride may be further preferably yttrium chloride hexahydrate, lanthanum chloride hexahydrate, praseodymium chloride hexahydrate, neodymium chloride hexahydrate, samarium chloride hexahydrate, holmium chloride hexahydrate, erbium chloride hexahydrate, and ytterbium chloride hexahydrate.
According to the invention, the yttrium chloride, lanthanum chloride, praseodymium chloride, neodymium chloride, samarium chloride, holmium chloride, erbium chloride and ytterbium chloride can be prepared by conventional methods or obtained by commercial sources, the purity of which is required to be greater than 99%, preferably greater than 99.9%, further preferably greater than 99.99%.
In the invention, trace substance tracers which can be selected in the tracer system are multiple in types, good in stability, not easy to react with underground fluid and minerals in the coal bed, and have no interference with each other, so that the use requirements of layered test and multistage fracturing test of the coal bed gas horizontal well can be well met.
According to the present invention, the complexing agent is selected from at least one of ethylenediamine tetraacetic acid (EDTA), disodium ethylenediamine tetraacetic acid (EDTA-2 Na), and tetrasodium ethylenediamine tetraacetic acid (EDTA-4 Na). In the process that the tracer system is dissolved into the fracturing fluid and performs fracturing and gas production operations of the coal-bed gas well, the complexing agent can complex rare earth elements (namely trace elements) in the solution, so that the activity of free trace element ions is reduced, trace elements are not easy to enter pores of the coal bed, and the adsorption rate of the trace elements in the coal bed is reduced.
According to a preferred embodiment of the invention, the complexing agent is tetrasodium ethylenediamine tetraacetate.
In the invention, the fracturing fluid is a water-based fracturing fluid, namely a fracturing fluid prepared by taking water as a solvent or a dispersion medium.
According to the invention, the extractant has stronger rare earth element solubility, and most rare earth elements adsorbed by the coal seam can be returned to the fracturing fluid through extraction, so that the loss of trace elements is reduced.
According to the invention, preferably, the extractant is selected from di (2-ethylhexyl) phosphate (HDEHP) and/or monoethylhexyl 2-ethylhexyl phosphate (HEH/EHP).
According to a preferred embodiment of the invention, the extractant is di (2-ethylhexyl) phosphate.
According to the invention, the saponification agent can greatly improve the solubility of the extraction agent in the fracturing fluid so as to better play a role, and the tracer system can be well dissolved into the fracturing fluid in the whole. In addition, the saponification agent is alkaline, so that the saponification agent can also play a role in stabilizing the pH value of the fracturing fluid, and the acid extractant cannot generate acid corrosion to stratum and construction pipe columns.
According to a preferred embodiment of the present invention, the saponification agent is sodium hydroxide.
According to the invention, in the tracer system, the quantitative relationship of the components satisfies: chlorides of the rare earth elements: the weight ratio of the complexing agent is 1: (0.8-1.2), the complexing agent: the weight ratio of the extractant is (8-12): 1, the saponification agent: the weight ratio of the extractant is 1: (40-70).
Preferably, each component in the tracer system satisfies the above quantitative relationship, further, the chloride of the rare earth element: the weight ratio of the complexing agent is 1: (1-1.1), the complexing agent: the weight ratio of the extractant is (9.5-10.5): 1, the saponification agent: the weight ratio of the extractant is 1: (63-68), thereby providing the tracer system with further reduced tracer adsorption in the coalbed methane reservoir, and better stability, compatibility.
According to the invention, in the tracer system, the effect possibly brought by the addition of the components can be considered, for example, a complexing agent can play a role in reducing the ion activity of free tracer elements in the fracturing fluid, an extracting agent can play a role in returning the trace elements adsorbed by a coal bed into the fracturing fluid, and a saponifier can play a role in promoting the better dissolution of the tracer system into the fracturing fluid, but when the specific rare earth element chlorides, complexing agents, extracting agents and saponifier components are contained and the quantity relation of the components is met, the synergistic effect can be produced, so that the tracer system has the characteristics of low adsorption rate of the tracer, good compatibility with the fracturing fluid, good stability and no mutual interference of the trace elements in the fracturing and gas production construction of the coal-bed gas well. Outside the above-mentioned limits, the above-mentioned combination of properties of the tracer system provided by the invention cannot be obtained.
According to a preferred embodiment of the invention, the tracer system comprises a chloride of a rare earth element, tetrasodium ethylenediamine tetraacetate, di (2-ethylhexyl) phosphate and sodium hydroxide, wherein the chloride of a rare earth element: the weight ratio of the ethylene diamine tetraacetic acid to the tetrasodium salt is 1: (1-1.1); tetra sodium ethylene diamine tetraacetate: the weight ratio of the di (2-ethylhexyl) phosphate is (9.5-10.5): 1, a step of; sodium hydroxide: the weight ratio of the di (2-ethylhexyl) phosphate is 1: (63-68).
According to a further preferred embodiment of the present invention, the tracer system comprises a chloride of a rare earth element, tetrasodium ethylenediamine tetraacetate, di (2-ethylhexyl) phosphate and sodium hydroxide, wherein the chloride of a rare earth element: the weight ratio of the ethylene diamine tetraacetic acid to the tetrasodium salt is 1:1.1; tetra sodium ethylene diamine tetraacetate: the weight ratio of the di (2-ethylhexyl) phosphate is 10:1, a step of; sodium hydroxide: the weight ratio of the di (2-ethylhexyl) phosphate is 1:65.
according to the invention, the tracer system can further comprise defoamer, drag reducer and ethoxylated alcohol on the basis of the components, thereby being beneficial to the operability and safety of construction.
According to the invention, in the process that the tracer system is dissolved into the fracturing fluid to form the tracer solution, the complexing agent and the extractant act together to promote the generation of micro bubbles, so that inconvenience is brought to site operation, for example, the adding amount of the tracer is difficult to determine, and the tracer solution meeting the requirements cannot be prepared in time, so that obvious foam can not be generated in the preparation process of the tracer solution due to the inclusion of the defoamer in the tracer system, and the foam in flowback fluid is also obviously reduced in the fracturing and gas production construction processes. Preferably, the defoamer is selected from at least one of polyether-silicone defoamer, polyether defoamer and silicone defoamer.
In the present invention, the polyether-silicone defoamer, the polyether defoamer and the silicone defoamer are not particularly limited, and can be self-made by a conventional method or can be a conventional commercially available brand product.
According to the present invention, considering that the depth of burial of the coal seam is relatively shallow (the depth is much smaller than the oil layer), the pressure of the ground is small, and the pressure used in fracturing is relatively small, in this case, the present inventors consider that the problem of the increase of the casing pressure caused by the tracer addition cannot be ignored. According to the invention, the drag reducer is incorporated into the tracer system, so that turbulence and friction increase phenomena caused in a pipe in the process of pumping the fracturing fluid into a stratum at a high speed through a pipe column after the rare earth element chloride (tracer), the complexing agent, the extractant and the saponifier are mixed with the propping agent of the fracturing fluid can be effectively reduced, and pressure loss is reduced, and the casing pressure is maintained in a relatively stable state in the fracturing construction process without generating larger fluctuation along with the injection of the tracer. Preferably, the drag reducer is selected from at least one of polyacrylamide, guar gum, xanthan gum, and polyethylene oxide.
In the present invention, preferably, the drag reducing agent has a molecular weight of 20 to 1800 thousand g/mol.
According to the invention, the ethoxylated alcohol in the tracer system has the function of reducing the surface tension of the fracturing fluid, improves the flowback rate of the fracturing fluid, and effectively solves the problem of less flowback fluid in the fracturing construction process of the coal-bed gas well. Preferably, the ethoxylated alcohol may be in particular an ethoxylated-C12-16-alcohol and/or an ethoxylated-C12-18-alcohol.
According to the present invention, in the tracer body, preferably, the antifoaming agent: the weight ratio of the chlorides of rare earth elements is (0.005-0.01): 1.
according to the present invention, in the tracer body, preferably, the drag reducing agent: the weight ratio of the chlorides of the rare earth elements is (1-2): 1, a step of; preferably, the ethoxylated alcohol: the weight ratio of the chlorides of rare earth elements is (1.5-3.5): 1.
according to the invention, the tracer system is prepared by fully mixing the components in the tracer system according to the quantitative relation. In application, a plurality of the tracer systems containing a single type of tracer can be prepared separately and added separately to different fracturing sections of a gas well at the time of use. The amount of the tracer system may be dependent on the particular situation of the fractured coal seam.
In the invention, specifically, in each fracturing section of the coal-bed gas well, the dosage of each tracer in the tracer system can be calculated according to the following formula (I);
wherein M is the dosage of the tracer needed by each fracturing segment and kg;
mu is a correction coefficient considering factors such as stratum water invasion, coal seam adsorption and the like, the value range is 800-1200, and the dimensionless quantity is achieved; specific values of μmay be represented by μ=d W ×A t ×N×T r To determine; wherein D is W To account for multiples of formation invasion, a dimensionless quantity; a is that t To consider the multiple of coal bed adsorption, a dimensionless number; n is the number of stages of staged fracturing; t (T) r A dimensionless quantity for taking into account a multiple of the residence time of the tracer in the formation;
C e for each concentration of tracer (rare earth chloride), mg/m 3 ；C e Can be represented by formula C e ＝(C n ×m e )/m a Calculated, wherein C n For the minimum detection limit concentration of each trace element of the instrument, mg/m 3 ；m e For the relative molecular mass of each tracer (rare earth chloride); m is m a Relative atomic mass for each trace element (rare earth element);
v is the volume of the fracturing fluid injected into each fracturing segment, m 3 。
On this basis, the amounts of the other components can be obtained from the quantitative relationship of the components in the tracer system.
Aiming at the unique characteristics of 'internal adsorption and few external flowbacks' of a coalbed methane reservoir, the invention carries out formula design on the basis of a large number of researches to obtain a tracer system for the coalbed methane reservoir, wherein the tracer system comprises a plurality of tracer types, can stably exist in fracturing fluid for a long period, has good compatibility with the fracturing fluid, does not interfere each other, has small adsorption quantity in the coalbed, can greatly improve monitoring analysis precision, has no obvious foam generation in preparation and use, and does not cause the problem of rising of casing pressure.
The second aspect of the invention provides a fracturing monitoring method for a coal bed methane horizontal well, wherein the method comprises the step of monitoring fracturing flowback fluid of the coal bed methane horizontal well by adopting the tracer system in the first aspect.
According to the invention, preferably, the method for monitoring fracturing of the coal bed methane horizontal well further comprises the following steps: and adding the tracer system into each fracturing stage of the coal-bed gas well in the layered stage fracturing construction, sampling fracturing flowback fluid in the fracturing construction and gas production process, detecting the content of rare earth elements in the sampled sample, and evaluating the volume fracturing effect and the fracture state of each fracturing stage of the coal-bed gas horizontal well according to the detected content of the rare earth elements to realize the fracturing monitoring of the coal-bed gas horizontal well.
According to the invention, when the tracer system is added to each fracturing section of a coal-bed gas well in a stratified fracturing construction, the tracer system containing one tracer is added to each fracturing section, and the types of the tracers added to each fracturing section are different.
According to the present invention, preferably, mass spectrometry may be used to detect the rare earth element content in the fracturing flow-back fluid.
According to the invention, based on the rare earth element content in the fracturing flowback fluid, a fracturing tracing curve is obtained by establishing a fracturing tracer injection-flowback interpretation model, and the fracturing tracing curve can be used for evaluating the volume fracturing effect and the fracture state of each fracturing segment.
The present invention will be described in detail by examples. In the following examples and comparative examples,
yttrium chloride hexahydrate (purity 99.99 wt%), lanthanum chloride hexahydrate (purity 99.9 wt%), praseodymium chloride hexahydrate (purity 99.9 wt%), neodymium chloride hexahydrate (purity 99.9 wt%), holmium chloride hexahydrate (purity 99.9 wt%), ytterbium chloride hexahydrate (purity 99.9 wt%), samarium chloride hexahydrate (purity 99.9 wt%), and erbium chloride hexahydrate (purity 99.9 wt%) were purchased from shandong handicrafts, inc;
polyacrylamide: the weight average molecular weight is 300 ten thousand-1800 ten thousand g/mol, and the water is purchased from the Bibo water supply materials limited company in the consolidated market;
xanthan gum: the weight average molecular weight is 200 ten thousand to 1000 ten thousand g/mol, and is purchased from Sichuan Hua Tangju Rui biotechnology Co., ltd;
polyether-silicone defoamer: purchased from Hefei Xinwancheng environmental protection technology Co., ltd;
silicone defoamer: purchased from Hefei Xinwancheng environmental protection technology Co., ltd;
ethoxylated-C12-16-alcohols, ethoxylated-C12-18-alcohols: purchased from zheng Ai Kem chemical industry limited;
unless otherwise specified, all other materials used are commercially available products.
Example 1
Yttrium chloride hexahydrate (tracer), EDTA-4Na (complexing agent), HDEHP (extractant), naOH (saponification agent), polyacrylamide (drag reducer), polyether-organic silicon defoamer and ethoxylation-C12-18-alcohol are fully mixed to obtain a mixture, and the tracer system (marked as S1) for the coal bed gas reservoir is obtained.
The components and the contents of the S1 are shown in Table 1 in detail.
Examples 2 to 18
The procedure of example 1 was followed except that different tracers, complexing agents, extractants, saponifying agents, drag reducing agents, defoamers and ethoxylated alcohols were used, as well as the quantitative relationship of the components, to produce a tracer system for a coalbed methane reservoir (designated S2-S18).
The components and the contents of the S2-S18 are shown in Table 1 in detail.
Comparative example 1
A tracer system (designated D1) was prepared according to the procedure of example 1, except that EDTA-4Na was not included in the starting material, except that the conditions were the same as in example 1.
The components and the contents of the components in D1 are shown in Table 1 in detail.
Comparative example 2
A tracer system (designated D2) was prepared according to the procedure of example 1, except that the starting materials did not contain HDEHP and NaOH, and the other conditions were the same as in example 1.
The components and the content of the D2 are shown in the table 1 in detail.
Comparative example 3
A tracer system (designated D3) was prepared according to the procedure of example 1, except that the starting material did not contain NaOH, and the other conditions were the same as in example 1.
The components and the content of the D3 are shown in the table 1 in detail.
TABLE 1
Note that: in Table 1, A represents ethoxylated-C12-16-alcohols and B represents ethoxylated-C12-18-alcohols
Test case
Performance tests were performed on the tracer systems S1-S18, D1-D3 prepared in examples 1-18 and comparative examples 1-3, as follows:
1. stability test
The experiment was performed using the following steps:
(1) Adopting the formation water of the coal bed gas fracturing construction reservoir and respectively preparing the formation water and the tracer systems S1-S18 into the tracer element (namely rare earth element) with the concentration of 1mg/L (marked as C) 0 ) Is a tracer solution of (2);
(2) Placing the tracer solution into a constant-temperature water bath (water bath temperature is 43 ℃ to simulate reservoir temperature) for sealing and preserving for 60 days, and then testing tracer elements in the tracer solution by using an ICP-MS/Agilent 7900 type inductively coupled plasma mass spectrometerConcentration of element (denoted C 60 )；
(3) The concentration retention η of the tracer solution was calculated according to formula (ii) to evaluate the stability of the tracer system and the results are shown in table 2.
η＝C 60 /C 0 ×100％ (Ⅱ)
TABLE 2
As can be seen from table 2, in the tracer system for the coalbed methane reservoir, the concentration retention rate of the tracer solution in the stability experiment is higher than 96%, which indicates that the use of each component has no influence on the stability of the tracer element basically, and the stability of the tracer system meets the use requirement of the segmented monitoring of the coalbed methane reservoir. In addition, the complexing agent used in S18 is oxalic acid, which affects the stability of the tracer element.
2. Compatibility experiments
The experiment was performed using the following steps:
(1) Respectively preparing tracer mixed solutions with the concentration of tracer elements (namely rare earth elements) of 15mg/L by using tracer systems S1-S18 and a fracturing fluid sample M without the tracer;
(2) Placing the tracer mixed solution in a water bath constant temperature oscillator for oscillation treatment (the water bath temperature is 43 ℃ to simulate the reservoir temperature), sealing and preserving for 90 days, then observing whether the tracer mixed solution becomes turbid or generates precipitation, and testing the temperature resistance and the shearing resistance according to a method specified in SY/T5107-2005;
(3) Comparing the temperature resistance and shearing resistance of the tracer mixed solution stored for 90 days in a sealing way with a fracturing fluid sample M without the tracer;
wherein, based on the total weight of the fracturing fluid sample M without the tracer, the fracturing fluid sample M comprises the following components: 1% potassium chloride +0.025% drag reducing agent +0.01% ammonium persulfate.
The results are shown in Table 3.
TABLE 3 Table 3
| Tracer system | Cloudiness or precipitation |
| S1 | The solution is clear and has no sediment |
| S2 | The solution is clear and has no sediment |
| S3 | The solution is clear and has no sediment |
| S4 | The solution is clear and has no sediment |
| S5 | The solution is clear and has no sediment |
| S6 | The solution is clear and has no sediment |
| S7 | The solution is clear and has no sediment |
| S8 | The solution is clear and has no sediment |
| S9 | The solution is clear and has no sediment |
| S10 | The solution is clear and has no sediment |
| S11 | The solution is clear and has no sediment |
| S12 | The solution is clear and has no sediment |
| S13 | The solution is clear and has no sediment |
| S14 | The solution is clear and has no sediment |
| S15 | The solution is clear and has no sediment |
| S16 | The solution is clear and has no sediment |
| S17 | The solution is clear and has no sediment |
| S18 | A little white precipitate was generated |
As can be seen from table 3, the tracer system for the coalbed methane reservoir of the invention can be well compatible with the fracturing fluid system (containing chemical agents), and the fracturing fluid has no turbidity or precipitation (the complexing agent used in S18 is oxalic acid, which has a certain influence on compatibility).
In addition, before and after the tracer system is added, the temperature resistance and the shearing resistance of the fracturing fluid can be effectively maintained, the fracturing fluid is unaffected, and the fracturing construction requirements of a coalbed methane reservoir are met.
3. Interference test
The experiment was performed using the following steps:
(1) The ultrapure water and tracer systems S1, S2, S3, S4, S5, S6, S7 and S8 are utilized to prepare a mixed solution with the concentration of each tracer element (namely rare earth element) being 200mg/L (namely preparation concentration);
(2) And testing the content of each trace element in the mixed solution by utilizing liquid chromatography, comparing the prepared concentration and the measured concentration of each trace element in the mixed solution, and calculating the difference value between the prepared concentration and the measured concentration. The results are shown in Table 4.
TABLE 4 Table 4
| Trace element | Difference/%of prepared concentration and measured concentration of trace element in mixed solution |
| Yttrium | 4.35 |
| Lanthanum, lanthanum alloy | 5.46 |
| Praseodymium (Pr) | 5.62 |
| Neodymium | 5.79 |
| Holmium salt | 5.32 |
| Ytterbium (ytterbium) | 4.96 |
| Samarium | 5.02 |
| Erbium (erbium) and erbium-doped fiber | 4.58 |
As can be seen from Table 4, after the tracer systems S1-S8 for the coalbed methane reservoir are mixed, the measured concentration and the prepared concentration of the tracer elements contained in the tracer systems are close to each other (the difference is less than 6%), so that the tracer systems basically have no interference with each other, and the requirements of the segmented monitoring and use of the coalbed methane reservoir can be met.
4. Static adsorption experiments
According to the industry standard SY/T5925-2012 of tracer screening, the following steps are used for experiments:
(1) The tracer element (namely rare earth element) initial concentration (marked as C) is prepared by using the tracer systems S1-S18 and D1-D3 and the fracturing fluid sample M without the tracer Initial initiation ) 500C n Wherein C n For the minimum detection limit concentration of each tracer in the instrument, mg/m 3 )；
(2) Mixing the tracer mixed solution with screened coal samples (from Shanxi Baoder blocks, with particle size of 40-60 meshes, and coal samples after cleaning and drying) according to a weight ratio of 1:1, sealing, and then placing into a constant-temperature water bath kettle (with water bath temperature of 43 ℃ to simulate reservoir temperature) for standing;
(3) Sampling the above mixed solution of the rest tracer every 1 day, testing the concentration of tracer element in the sample by using CP-MS/Agilent 7900 type inductively coupled plasma mass spectrometer until reaching adsorption balance, i.e. the concentration of tracer element in the sample is not changed, recording the tracer element in the mixed solution of tracer during adsorption balanceConcentration of element (denoted as C) Adsorption equilibrium )；
(4) The adsorption rate of the tracer was calculated according to formula (iii), and the results are shown in table 5.
Adsorption rate% of tracer= (C Initial initiation -C Adsorption equilibrium )/C Initial initiation ×100％ (Ⅲ)
TABLE 5
As can be seen from table 5, the tracer system for a coalbed methane reservoir of the invention has a small adsorption amount in the coalbed, the adsorption rate is only 10-20%, the industrial standard of tracer screening can be met under the condition of smaller tracer dosage, and the adsorption rate of the tracer system containing rare earth elements yttrium, lanthanum, praseodymium and neodymium in the coalbed is relatively smaller under the condition that other conditions in the system are the same.
The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, a number of simple variants of the technical solution of the invention are possible, including combinations of the individual technical features in any other suitable way, which simple variants and combinations should likewise be regarded as being disclosed by the invention, all falling within the scope of protection of the invention.
Claims (16)
1. A tracer system for a coal-bed gas reservoir, comprising: chlorides of rare earth elements, complexing agents, extractants and saponifying agents; wherein,
the rare earth element chloride is selected from at least one of yttrium chloride, lanthanum chloride, praseodymium chloride, neodymium chloride, samarium chloride, holmium chloride, erbium chloride and ytterbium chloride;
the complexing agent is at least one of ethylenediamine tetraacetic acid, disodium ethylenediamine tetraacetate and tetrasodium ethylenediamine tetraacetate;
the extractant is an acidic phosphate extractant; the saponifier is at least one of sodium hydroxide, sodium carbonate and sodium bicarbonate;
chlorides of the rare earth elements: the weight ratio of the complexing agent is 1: (0.8-1.2);
the complexing agent: the weight ratio of the extractant is (8-12): 1, a step of;
the saponification agent: the weight ratio of the extractant is 1: (40-70).
2. A tracer system according to claim 1, wherein the complexing agent is tetrasodium ethylenediamine tetraacetate.
3. A tracer system according to claim 1, wherein the extractant is selected from di (2-ethylhexyl) phosphate and/or monoethylhexyl 2-ethylhexyl phosphate.
4. A tracer system according to claim 3, wherein the extractant is di (2-ethylhexyl) phosphate.
5. A tracer system according to any of claims 1-4, wherein the saponifying agent is sodium hydroxide.
6. A tracer system according to any of claims 1-4, wherein the chlorides of rare earth elements: the weight ratio of the complexing agent is 1: (1-1.1).
7. A tracer system according to any of claims 1-4, wherein the complexing agent: the weight ratio of the extractant is (9.5-10.5): 1.
8. a tracer system according to any of claims 1-4, wherein the saponifying agent: the weight ratio of the extractant is 1: (63-68).
9. The tracer system of any of claims 1-4, wherein the tracer system further comprises an antifoaming agent, a drag reducer, and an ethoxylated alcohol.
10. The tracer system of claim 9, wherein the defoamer is selected from at least one of a polyether-silicone defoamer, a polyether defoamer, and a silicone defoamer.
11. The tracer system of claim 9, wherein the drag reducing agent is selected from at least one of polyacrylamide, guar gum, xanthan gum, and polyethylene oxide.
12. The tracer system of claim 9, wherein the defoamer: the weight ratio of the chlorides of rare earth elements is (0.005-0.01): 1.
13. the tracer system of claim 9, wherein the drag reducer: the weight ratio of the chlorides of the rare earth elements is (1-2): 1.
14. a tracer system according to claim 9, wherein the ethoxylated alcohol: the weight ratio of the chlorides of rare earth elements is (1.5-3.5): 1.
15. a method of monitoring the fracturing flow-back of a horizontal well of coalbed methane, wherein the method comprises monitoring the fracturing flow-back of a horizontal well of coalbed methane with the tracer system of any one of claims 1-14.
16. The method of claim 15, wherein the method comprises: and adding the tracer system into each fracturing stage of the coal-bed gas well in the layered stage fracturing construction, sampling fracturing flowback fluid in the fracturing construction and gas production process, detecting the content of rare earth elements in the sampled sample, and evaluating the volume fracturing effect and the fracture state of each fracturing stage of the coal-bed gas horizontal well according to the detected content of the rare earth elements to realize the fracturing monitoring of the coal-bed gas horizontal well.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210509062 | 2022-05-10 | ||
| CN202210509062X | 2022-05-10 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115288649A CN115288649A (en) | 2022-11-04 |
| CN115288649B true CN115288649B (en) | 2024-04-16 |
Family
ID=83827163
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210921318.8A Active CN115288649B (en) | 2022-05-10 | 2022-08-02 | Tracer system for coalbed methane reservoir and coalbed methane horizontal well fracturing monitoring method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115288649B (en) |
Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1081491A (en) * | 1992-07-15 | 1994-02-02 | 中国核动力研究设计院 | A kind of survey of wells by radioactive isotope tracking method |
| CN103556990A (en) * | 2013-10-30 | 2014-02-05 | 大庆市永晨石油科技有限公司 | Oil production well productivity tracking and evaluating method |
| CN103603655A (en) * | 2013-10-12 | 2014-02-26 | 中国石油天然气股份有限公司 | Tracer agent for monitoring multistage fracturing flowback fluid and monitoring method |
| CN106833595A (en) * | 2017-03-13 | 2017-06-13 | 河南理工大学 | A kind of multi-solvent combination fracturing liquid and coal bed gas well pressing crack construction technique |
| WO2018093272A1 (en) * | 2016-11-18 | 2018-05-24 | Institutt For Energiteknikk | Tracers |
| 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 |
| CN108825226A (en) * | 2018-07-02 | 2018-11-16 | 四川圣诺油气工程技术服务有限公司 | A kind of method and device for assessing gas production after pressure using chemical tracer |
| CN109577959A (en) * | 2019-01-23 | 2019-04-05 | 四川富利斯达石油科技发展有限公司 | A method of adjacent fracturing section fracture connectivity is measured using tracer |
| CN109667574A (en) * | 2017-10-13 | 2019-04-23 | 中国石油化工股份有限公司 | A kind of multistage pressure break metal ion tracer and its application |
| 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 |
| CN111648765A (en) * | 2020-07-01 | 2020-09-11 | 青岛大地新能源技术研究院 | Environment-friendly oil-soluble tracer and application thereof |
| CN111764881A (en) * | 2020-08-04 | 2020-10-13 | 青岛大地新能源技术研究院 | Oil-soluble trace element tracer for multistage fracturing and application thereof |
| CN112031724A (en) * | 2020-07-31 | 2020-12-04 | 中国地质大学（武汉） | Method for observing hydraulic fracturing fracture of coal-bed gas well |
| CN112699554A (en) * | 2020-12-29 | 2021-04-23 | 西安石油大学 | Fracturing tracing constraint-based method for analyzing well test of tight oil reservoir in horizontal well after fracturing and subsection well test |
| CN112943227A (en) * | 2019-12-11 | 2021-06-11 | 天津大港油田圣达科技有限公司 | Lanthanide complex staged fracturing tracing technology |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013078031A1 (en) * | 2011-11-22 | 2013-05-30 | Baker Hughes Incorporated | Method of using controlled release tracers |
-
2022
- 2022-08-02 CN CN202210921318.8A patent/CN115288649B/en active Active
Patent Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1081491A (en) * | 1992-07-15 | 1994-02-02 | 中国核动力研究设计院 | A kind of survey of wells by radioactive isotope tracking method |
| CN103603655A (en) * | 2013-10-12 | 2014-02-26 | 中国石油天然气股份有限公司 | Tracer agent for monitoring multistage fracturing flowback fluid and monitoring method |
| CN103556990A (en) * | 2013-10-30 | 2014-02-05 | 大庆市永晨石油科技有限公司 | Oil production well productivity tracking and evaluating method |
| WO2018093272A1 (en) * | 2016-11-18 | 2018-05-24 | Institutt For Energiteknikk | Tracers |
| CN106833595A (en) * | 2017-03-13 | 2017-06-13 | 河南理工大学 | A kind of multi-solvent combination fracturing liquid and coal bed gas well pressing crack construction technique |
| CN109667574A (en) * | 2017-10-13 | 2019-04-23 | 中国石油化工股份有限公司 | A kind of multistage pressure break metal ion tracer and its application |
| 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 |
| CN108825226A (en) * | 2018-07-02 | 2018-11-16 | 四川圣诺油气工程技术服务有限公司 | A kind of method and device for assessing gas production after pressure using chemical tracer |
| CN109577959A (en) * | 2019-01-23 | 2019-04-05 | 四川富利斯达石油科技发展有限公司 | A method of adjacent fracturing section fracture connectivity is measured using tracer |
| 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 |
| CN112943227A (en) * | 2019-12-11 | 2021-06-11 | 天津大港油田圣达科技有限公司 | Lanthanide complex staged fracturing tracing technology |
| CN111648765A (en) * | 2020-07-01 | 2020-09-11 | 青岛大地新能源技术研究院 | Environment-friendly oil-soluble tracer and application thereof |
| CN112031724A (en) * | 2020-07-31 | 2020-12-04 | 中国地质大学（武汉） | Method for observing hydraulic fracturing fracture of coal-bed gas well |
| CN111764881A (en) * | 2020-08-04 | 2020-10-13 | 青岛大地新能源技术研究院 | Oil-soluble trace element tracer for multistage fracturing and application thereof |
| CN112699554A (en) * | 2020-12-29 | 2021-04-23 | 西安石油大学 | Fracturing tracing constraint-based method for analyzing well test of tight oil reservoir in horizontal well after fracturing and subsection well test |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115288649A (en) | 2022-11-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10233383B2 (en) | Method and compositions for enhanced oil recovery | |
| CN103343684B (en) | Complex tracer for monitoring among wells of high-temperature and hypersalinity block of oil field and application of complex tracer | |
| US3856468A (en) | Method for determining fluid saturations in petroleum reservoirs | |
| CN103615237A (en) | Microelement interwell tracer agent and application thereof | |
| CN204989151U (en) | Experimental device for simulation geothermol power tail water recharges chemistry and blocks up | |
| CN103603655A (en) | Tracer agent for monitoring multistage fracturing flowback fluid and monitoring method | |
| CN113338875B (en) | Method for increasing permeability of unconsolidated sandstone reservoir by using carbon dioxide-water solution | |
| CN103588801A (en) | Trace element well-to-well tracer agent use method | |
| CN103045189B (en) | Low-permeability solid-free completion fluid | |
| Russell et al. | Some experiments on the mobility of interstitial waters | |
| Beisner et al. | Geochemical characterization of groundwater discharging from springs north of the Grand Canyon, Arizona, 2009–2016 | |
| Rogov | Study of the well near-bottomhole zone permeability during treatment by process fluids | |
| CN115288649B (en) | Tracer system for coalbed methane reservoir and coalbed methane horizontal well fracturing monitoring method | |
| CN109667574B (en) | Metal ion tracer for multi-section fracturing and application thereof | |
| CN104402772A (en) | High base and high salinity resistance trace element tracer used for oil field, preparation method and application method thereof | |
| Shen et al. | Evaluating the connectivity of shale has wells by new rare element tracers | |
| CN108088874A (en) | A kind of leaching method of black shale soluble salt | |
| Conaway et al. | Comparison of geochemical data obtained using four brine sampling methods at the SECARB Phase III Anthropogenic Test CO2 injection site, Citronelle Oil Field, Alabama | |
| CN108084979A (en) | A kind of barium and strontium sulfate descaling agent | |
| Dick et al. | The use of an auxiliary ligand in the foam fractionation of copper | |
| CN109628091B (en) | Synthesis method and application of BYC tracer | |
| CN103194197B (en) | 3,5-Dibromosalicylaldehyde-2-Pyridinecarboxylic hydrazide and application thereof | |
| Yang et al. | Empirically assessing the potential release of rare earth elements from black shale under simulated hydraulic fracturing conditions | |
| CN113153278A (en) | Tracing monitoring and explaining method for multi-section fracturing production profile | |
| El-hoshoudy et al. | APPLICATION OF ACRYLAMIDE POLYMER GRAFTED WITH SiO 2 NANOPARTICLES IN ENHANCED OIL RECOVERY-DESIGN PROJECT. |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |