CN114034597B - Shale core high-temperature high-pressure saturation, fracturing and imbibition integrated device and method - Google Patents
Shale core high-temperature high-pressure saturation, fracturing and imbibition integrated device and method Download PDFInfo
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- 238000005213 imbibition Methods 0.000 title claims abstract description 114
- 238000000034 method Methods 0.000 title claims description 11
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 87
- 239000011521 glass Substances 0.000 claims abstract description 26
- 239000011435 rock Substances 0.000 claims abstract description 24
- 230000000007 visual effect Effects 0.000 claims abstract description 22
- 239000000725 suspension Substances 0.000 claims abstract description 20
- 238000002474 experimental method Methods 0.000 claims abstract description 16
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- 230000008595 infiltration Effects 0.000 claims abstract description 11
- 238000001764 infiltration Methods 0.000 claims abstract description 11
- 239000003921 oil Substances 0.000 claims description 60
- 239000007788 liquid Substances 0.000 claims description 23
- 238000004140 cleaning Methods 0.000 claims description 13
- 239000010779 crude oil Substances 0.000 claims description 13
- 238000005303 weighing Methods 0.000 claims description 13
- 229910000831 Steel Inorganic materials 0.000 claims description 12
- 239000012530 fluid Substances 0.000 claims description 12
- 238000011084 recovery Methods 0.000 claims description 12
- 239000010959 steel Substances 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 230000001105 regulatory effect Effects 0.000 claims description 9
- 230000000694 effects Effects 0.000 claims description 8
- 229920001971 elastomer Polymers 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 6
- 230000002269 spontaneous effect Effects 0.000 claims description 6
- 230000001276 controlling effect Effects 0.000 claims description 5
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 3
- 238000010521 absorption reaction Methods 0.000 claims description 3
- 239000011737 fluorine Substances 0.000 claims description 3
- 229910052731 fluorine Inorganic materials 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 239000013589 supplement Substances 0.000 claims description 3
- 239000003079 shale oil Substances 0.000 abstract description 15
- 238000005086 pumping Methods 0.000 abstract 1
- 108010066114 cabin-2 Proteins 0.000 description 11
- 238000011161 development Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000009738 saturating Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
- 238000012800 visualization Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/02—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by absorbing or adsorbing components of a material and determining change of weight of the adsorbent, e.g. determining moisture content
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N2015/0866—Sorption
- G01N2015/0873—Dynamic sorption, e.g. with flow control means
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention relates to a shale core high-temperature high-pressure saturation, fracturing and imbibition integrated device and an experimental method thereof, belonging to the field of shale oil exploitation, and comprising a pressurizing cabin, wherein a heating sleeve is sleeved outside the pressurizing cabin, a saturated imbibition cabin is arranged inside the pressurizing cabin, a fracturing pipe at the upper part of a core is connected with a two-way switch, the two-way switch is connected with a three-way switch, the upper part of the three-way switch is connected with a visual glass pipe, and the right end of the three-way switch is connected with a pressurizing pump; a suspension wire is wound on the fracturing pipe body, and the upper part of the suspension wire passes through a ten-thousandth balance and is used for measuring the weight of the shale core before and after saturation; the bottom of the saturated infiltration cabin is connected with a six-way valve, and a plurality of intermediate containers, a vacuum pump and a parallel flow pump are connected to the six-way valve. The invention can carry out vacuum pumping high-pressure saturation on the shale rock core, and carry out fracturing and imbibition under the condition of not transferring the rock core, and a series of experiments are carried out at high temperature and high pressure, so that the imbibition rule of the shale oil reservoir under stratum conditions can be truly reflected.
Description
Technical Field
The invention relates to a shale core high-temperature high-pressure saturation, fracturing and imbibition integrated device and method, and belongs to the technical field of shale oil exploitation.
Background
Along with the mass exploitation of conventional oil gas in China, the development and utilization of unconventional energy are not slow. Shale oil, the main component of unconventional energy sources, has long been explored by its exploitation. Due to the integral reservoir forming characteristics of the shale oil reservoir, the reservoir is extremely compact and has high brittle mineral content, and the fracturing technology becomes a necessary means for shale oil exploitation.
The high content of brittle minerals provides good compressibility for shale oil reservoirs, the conventional fracturing method of shale oil at present is a fracturing technical means such as vertical well fracture network fracturing and horizontal well volume fracturing, and the shale oil reservoirs after fracturing can obtain industrial oil flows, but the recovery ratio is often lower than 10%. The nano pore throats and microcracks which are developed in a large amount of shale oil reservoirs are fully utilized, and the recovery ratio can be improved by combining a complex fracture network formed after fracturing, wherein the imbibition plays an extremely important role in the development of the shale oil reservoirs.
In order to improve the recovery ratio, a great amount of indoor experimental researches are carried out on shale imbibition phenomenon, and a traditional Amott water absorber is generally adopted for normal pressure normal temperature static spontaneous imbibition, but the method cannot simulate the high-temperature and high-pressure condition of the ground. In recent years, some high-temperature high-pressure imbibition instruments are also made of non-transparent materials such as stainless steel, and cannot observe, or the saturated oil is transferred to the imbibition instrument for experiment after the saturated oil is externally carried out on the core, so that the loss of the saturated oil or the pollution on the surface of the core can be possibly caused, or the imbibition experiment is carried out on the whole core, and the situation of imbibition after fracturing in the actual development process cannot be reduced.
Disclosure of Invention
In order to solve the defects of the prior art, the invention aims to design a shale core high-temperature and high-pressure saturation, fracturing and imbibition integrated device and an experimental method thereof, the device can carry out vacuumizing and high-pressure saturation on the shale core, and carry out fracturing and imbibition under the condition of not transferring the core, and a series of experiments are carried out at high temperature and high pressure, so that imbibition rules of a shale oil reservoir under stratum conditions can be truly reflected.
The shale core high-temperature high-pressure saturation, fracturing and imbibition integrated device comprises a pressurizing cabin, wherein the pressurizing cabin is a steel container, flange covers are arranged on the upper part and the lower part of the pressurizing cabin to form a sealed container, two holes are respectively formed in the two sides of the upper flange cover and are respectively used for placing a thermometer and an exhaust valve, the thermometer is used for detecting the temperature of a system, and the exhaust valve is used for exhausting redundant gas in the pressurizing cabin in the pressurizing process;
the outside of the pressurizing cabin is sleeved with a heating sleeve, the whole system is heated through the heating sleeve so as to simulate a high-temperature environment, the upper flange cover of the pressurizing cabin is connected with a saturated imbibition cabin, a shale core with a designed specification is placed in the saturated imbibition cabin, the size of the core is slightly smaller than that of the saturated imbibition cabin, a counter bore matched with a fracturing pipe is processed at the upper part of the core, the fracturing pipe is inserted into the counter bore, and the fracturing pipe is connected with the upper flange cover of the pressurizing cabin through a sealing thread;
the fracturing pipe extends out of the pressurizing cabin and is connected with a two-way switch, the two-way switch is connected with a three-way switch through a pipeline, the upper part of the three-way switch is connected with a high-pressure-resistant visual glass pipe with scales (the precision of the visual glass pipe is 0.01 mL), the right end of the three-way switch is connected with a pressurizing pump through a pipeline, and the pipeline is provided with a pressure gauge A, an intermediate container A for containing fracturing fluid and a control switch;
a suspension wire is wound on the fracturing pipe body, and the upper part of the suspension wire penetrates through a ten-thousandth balance and is used for measuring the weight of shale core before and after saturation;
the bottom of the saturated infiltration chamber is connected with a six-way valve through a pipeline, the pipeline is provided with an electric valve for controlling the on-off of the six-way valve, the saturated infiltration chamber and the pressurizing chamber, namely controlling liquid to enter the pressurizing chamber or the saturated infiltration chamber, the pipeline connected with the electric valve passes through a flange cover at the lower part of the pressurizing chamber to be connected with the six-way valve through sealing connection, and the six-way valve is connected with an intermediate container filled with different liquids, a vacuum pump for vacuumizing a rock core and a advection pump for pushing a piston of the intermediate container.
Preferably, the saturated infiltration chamber is connected with the flange cover at the upper part of the pressurizing chamber through steel threads, the upper part of the steel threads is connected with the flange cover of the pressurizing chamber through threads, and the lower part of the steel threads is connected with the pressurizing infiltration chamber through interference fit.
Preferably, the saturated infiltration chamber is made of fluorine-containing rubber with high temperature resistance and high pressure resistance.
Preferably, the six-way valve comprises 6 switches, namely a switch A, a switch B, a switch C, a switch D, a switch E and a switch F, wherein the switch A is connected with an intermediate container B filled with seepage liquid, the switch B is a master switch of the six-way valve, the master switch is connected with an electric valve through a pipeline, the switch C is connected with the intermediate container C filled with crude oil, the switch D is connected with a vacuum pump, the switch E is connected with the intermediate container D filled with water or cleaning liquid, and the switch F is connected with a advection pump.
Preferably, a vacuum pressure gauge is arranged on a pipeline connected with the switch D and the vacuum pump, and a pressure gauge B is arranged on a pipeline connected with the switch F and the advection pump.
The vacuum pressure gauge is a gauge for measuring the pressure less than the atmospheric pressure by taking the atmospheric pressure as a reference and is generally used for a place with negative pressure; the pressure gauge is a gauge indicating a pressure higher than ambient. The pipeline that switch D and vacuum pump are connected adopts the vacuum pressure gauge in order to take out the shale rock core vacuum in the saturated infiltration cabin, promptly under the vacuum pump effect, take out the gas in the shale rock core hole, avoid the oil gas two-phase existence great resistance and the circumstances that the oil does not take place to saturate when saturated oil, adopt the effect of vacuum pressure gauge to be the vacuum pump during operation of detection can guarantee always be the negative pressure state to the pipeline has the condition that the seal is bad or blocks up.
Preferably, the electric valve is an electric three-way valve and comprises an electric pin, an inlet and two outlets, namely an outlet A and an outlet B, wherein the outlet A is connected with the pressurizing cabin, and the outlet B is connected with the saturated imbibition cabin. The electric pin has three gears, as shown in fig. 2, including 1 gear, 2 gear and 3 gear, when the electric pin dials 1 gear for closing the gear to block the pipeline, when the electric pin dials 2 gear, the liquid enters the pressurizing cabin, and when the electric pin dials 3 gear, the liquid enters the saturated imbibition cabin.
Preferably, a supporting frame is arranged on the ten-thousandth balance and is used for supporting the suspension wire.
In the invention, when weighing, the support frame supports the suspension wire, so that weighing errors caused by the contact of the suspension wire with the balance are avoided, the lower part of the suspension wire is connected with the fracturing pipe and the dry rock core, and the mass of the support frame, the mass of the suspension wire and the mass of the fracturing pipe are known and unchanged, so that the weighing of the rock core can be performed.
The experimental method of the shale core high-temperature high-pressure saturation, fracturing and imbibition integrated device comprises the following steps of:
(1) Firstly, placing the dried shale core into a saturated imbibition cabin, switching off a two-way switch, measuring the weight M0 of the dry core and a fracturing pipe by using a ten-thousandth balance, adjusting an electric valve to enable the saturated imbibition cabin to be connected with a six-way valve, switching on a switch B and a switch D, switching off other switches, switching off the two-way switch, and switching on a vacuum pump to vacuumize the shale core;
(2) After the vacuumizing is finished, a six-way valve switch B and a switch C are opened, the rest switches are closed, crude oil in the middle container C spontaneously enters a saturated seepage and suction cabin under the action of pressure difference, after the spontaneous oil absorption is finished, an electric valve is closed, the switch B, the switch E and the switch F are opened, cleaning liquid in the middle container D is cleaned on a pipeline under the action of a advection pump, cleaning liquid in the middle container D is changed into clean water after the cleaning is finished, the electric valve is regulated to enable the six-way valve to be communicated with the pressurizing cabin, the advection pump is utilized to push clean water in the middle container D to pressurize the pressurizing cabin, the pressure gauge B is used for detecting the pressure so as to ensure that the pressure is higher than the set saturated pressure by 2MPa, and the reason that the saturated seepage and suction cabin is made of rubber is realized, the pressurizing cabin has the confining pressure effect, and the rubber is ensured not to expand;
(3) The electric valve is regulated to disconnect the pressurizing cabin from the six-way valve, the saturation suction cabin is replaced to be connected with the six-way valve, the heating sleeve is opened to enable the system to reach the designated temperature, the switch B, the switch C and the switch F of the six-way valve are opened, crude oil in the middle container C is pushed to enter the saturation suction cabin by the advection pump to reach the set pressure, pressurization and saturation are carried out for two weeks, the pressure gauge B is used for detecting the pressure during the period, and if the pressure is reduced, the advection pump is opened to supplement the pressure;
(4) After the core is saturated, opening a switch B and a switch C of a six-way valve to enable redundant crude oil in a saturated imbibition cabin to flow into an intermediate container C, standing for 1-2 days, weighing the total weight of the core after a fracturing pipe and saturated oil by using a ten-thousandth balance, calculating saturated oil quantity, opening a switch B, a switch E and a switch F of the six-way valve, closing other six-way valve switch regulating electric valves to enable a pressurizing cabin to be communicated with the six-way valve, enabling liquid in the pressurizing cabin to flow into the intermediate container D under the action of pressure difference, playing a role of cleaning a pipeline, replacing dirty water in the intermediate container D, pressurizing the pressurizing cabin by using a advection pump until the pressure is greater than the shale core fracturing pressure by 2MPa, closing all switches of the six-way valve and preparing the fracturing core;
(5) The two-way switch is turned on, the three-way switch is switched to disconnect the visual glass tube from the pipeline, the control switch is turned on, the pressure gauge A is used for detecting the pressure of the shale rock core by pushing the fracturing fluid in the middle container A, the pressure is corresponding to the rock core fracture pressure, the pressure is prevented from being too large or too small, and when the pressure suddenly drops to a certain value from a large value, the rock core fracture is successfully indicated;
(6) When the fracturing is finished, the control switch is closed, the electric valve is opened to enable the saturated imbibition cabin to be communicated with the six-way valve through a pipeline, the switch B and the switch E of the six-way valve are opened to enable redundant fracturing fluid to flow into the middle container D, the switch E is closed, the switch A, the switch B and the switch F are opened, imbibition fluid in the middle container B is injected into the saturated imbibition cabin by using the advection pump, the injection pressure is detected by using the pressure gauge B, when the pressure reaches experimental pressure (the experimental pressure is supposed to be the actual pressure of an analog reservoir, such as 5, 8, 12MPa and the like, all the switches of the six-way valve are closed, so that the shale core which is saturated with oil and has been fractured spontaneously imbibition is carried out under the high temperature and high pressure, the imbibition oil quantity is floated to a visual glass tube through the fracturing tube under the buoyancy effect, and the imbibition oil quantity is recorded in different time periods, and the imbibition speed and the final imbibition recovery ratio are calculated.
Preferably, in the step (3), the heating sleeve is heated to enable the system temperature to be 80-150 ℃ according to the actual temperature of the oil reservoir, the set pressure of crude oil entering the saturated imbibition cabin is determined according to the actual pressure of the oil reservoir, and the set pressure is preferably 20-45MPa in an experiment.
Preferably, the accuracy of the visualized glass tube is 0.01mL.
Preferably, assuming that the total weight of the core after weighing the fracturing pipe and the saturated oil by a ten-thousandth balance is M00, the saturated oil amount m1=m00-M0;
the imbibition speed is calculated according to the oil quantity observed in the visual glass tube within a certain time, for example, the oil quantity in the visual glass tube is 0.01mL for the first 6 hours, the imbibition speed is 0.01mL/6 hours at the moment, the oil quantity in the visual glass tube is 0.03mL after the lapse of 6 hours, and the imbibition speed is (0.03-0.01) =0.02 mL/6 hours at the moment;
imbibition recovery ratioWherein, the method comprises the steps of, wherein,V 1 to visualize the oil volume in the glass tube after the end of the imbibition,V total (S) Is saturated oil volume>ρ is the saturated oil density, which is known.
The invention is not exhaustive and can be seen in the prior art.
The beneficial effects of the invention are as follows:
since the natural stratum mined core is extremely precious, a large number of repeated experiment core conditions in a laboratory cannot be met, and the natural outcrop core is often subjected to oil wettability treatment to simulate reservoir conditions during experiments. According to the invention, the initial state of the shale oil reservoir, namely the oil wet state, is considered, and the manual contact of the rock core is not needed in the experiment, so that the pollution of the small pore throat of the shale rock core by external conditions is avoided. After the rock core is dried, the rock core is placed into a saturated imbibition cabin, a vacuumizing pump is started to vacuumize the rock core, and after vacuumization, the shale rock core is saturated under high pressure in a self-priming mode and a pressurizing mode, so that the shale rock core can reach the original state of a reservoir as far as possible. After saturation is finished, the core is not required to be taken out, the weight of the core after the fracturing pipe and saturated oil can be measured by removing the two-way switch at the upper part of the fracturing pipe, and the saturated oil quantity can be directly calculated so as to calculate the recovery ratio subsequently. After weighing, the shale core can be directly subjected to fracturing so as to simulate the site situation, a spontaneous imbibition experiment can be carried out at high temperature and high pressure after the fracturing is finished, the change value of the imbibition amount along with time can be observed in the visual glass tube, and the recovery ratio and the recovery speed are recorded.
The whole device well simulates the original condition of the shale oil reservoir under the oil reservoir condition, can simulate the conditions of on-site fracturing, well sealing and imbibition displacement oil extraction in a laboratory, and visually measures the imbibition displacement oil quantity, thereby providing conditions for visual fracturing and imbibition experiments of the shale oil reservoir under the high-temperature and high-pressure environment.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of a shale core high-temperature high-pressure saturation, fracturing and imbibition integrated device according to the invention;
FIG. 2 is a schematic diagram of an electrically operated valve;
FIG. 3 is a schematic diagram of the mode of operation of the ten-thousandth scale;
reference numerals illustrate:
1-shale core, 2-saturated imbibition cabin, 3-pressurizing cabin, 4-heating jacket, 5-electric valve, 6-intermediate container B, 7-intermediate container C, 8-six-way valve, 9-pressure gauge B, 10-intermediate container D, 11-vacuum pressure gauge, 12-advection pump, 13-vacuum pump, 14-thermometer, 15-two-way switch, 16-suspension wire, 17-three-way switch, 18-visualization glass tube, 19-ten thousandth balance, 20-control switch, 21-pressure gauge A, 22-pressurizing pump, 23-fracturing tube, 24-exhaust valve, 25-intermediate container A;
501-inlet, 502-outlet a, 503-outlet B, 504-electric pin;
801-switch a, 802-switch B, 803-switch C, 804-switch D, 805-switch E, 806-switch F;
1901-supporting frames.
Detailed Description
In order to better understand the technical solutions in the present specification, the following description will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the implementation of the present specification, but not limited thereto, and the present invention is not fully described and is according to the conventional technology in the art.
Example 1:
1-3, the shale core high-temperature high-pressure saturation, fracturing and imbibition integrated device comprises a pressurizing cabin 3, wherein the pressurizing cabin 3 is a steel container, flange covers are arranged on the upper part and the lower part of the pressurizing cabin to form a sealed container, two holes are respectively formed on two sides of the upper flange cover and are respectively used for placing a thermometer 14 and an exhaust valve 24, the thermometer 14 is used for detecting the temperature of a system, and the exhaust valve 24 is used for exhausting redundant gas in the pressurizing cabin in the pressurizing process;
the outside of the pressurizing cabin 3 is sleeved with a heating sleeve 4, the whole system is heated through the heating sleeve 4 to simulate a high-temperature environment, a saturated imbibition cabin 2 is connected with a flange cover at the upper part of the pressurizing cabin 3, a shale core 1 with a designed specification is placed in the saturated imbibition cabin 2, the size of the core is slightly smaller than that of the saturated imbibition cabin, a counter bore matched with a fracturing pipe 23 is processed at the upper part of the core, the fracturing pipe 13 is inserted into the counter bore, and the fracturing pipe 13 is connected with the flange cover at the upper part of the pressurizing cabin through a sealing thread;
the fracturing pipe 23 extends out of the pressurizing cabin 3 and then is connected with a two-way switch 15, the two-way switch 15 is connected with a three-way switch 17 through a pipeline, the upper part of the three-way switch 17 is connected with a visual glass tube 18 with a scale and high pressure resistance (the precision of the visual glass tube is 0.01 mL), the right end of the three-way switch 17 is connected with a pressurizing pump 22 through a pipeline, and the pipeline is provided with a pressure gauge A21, an intermediate container A25 for containing fracturing fluid and a control switch 20;
the pipe body of the fracturing pipe 23 is wound with a suspension wire 16, and the upper part of the suspension wire 16 passes through a ten-thousandth balance 19 and is used for measuring the weight of shale cores before and after saturation;
the bottom of the saturated imbibition cabin 2 is connected with a six-way valve 8 through a pipeline, an electric valve 5 is arranged on the pipeline and used for controlling the on-off of the six-way valve 8 and the saturated imbibition cabin and the pressurizing cabin, namely controlling the liquid to enter the pressurizing cabin or the saturated imbibition cabin, the pipeline connected with the electric valve passes through a flange cover at the lower part of the pressurizing cabin to be connected with the six-way valve through sealing connection, and the six-way valve 8 is connected with an intermediate container filled with different liquids, a vacuum pump 13 used for vacuumizing a rock core and a advection pump 12 used for pushing a piston of the intermediate container.
Example 2:
the shale core high-temperature high-pressure saturation, fracturing and imbibition integrated device is as shown in embodiment 1, and is different in that a saturated imbibition cabin 2 is connected with an upper flange cover of a pressurizing cabin 3 through steel threads, the upper part of the steel threads is connected with the flange cover of the pressurizing cabin through threads, and the lower part of the steel threads is connected with the pressurizing imbibition cabin through interference fit.
Example 3:
a shale core high-temperature high-pressure saturation, fracturing and imbibition integrated device is shown in embodiment 1, and is different in that a saturation imbibition cabin is made of fluorine-containing rubber with high temperature resistance and high pressure resistance.
Example 4:
the utility model provides a shale rock core high temperature high pressure saturation, fracturing, imbibition integrated device, as shown in example 1, the difference is that six-way valve 8 includes 6 switches, respectively switch A801, switch B802, switch C803, switch D804, switch E805 and switch F806, switch A801 connects the intermediate container B6 that is equipped with the imbibition liquid, switch B is the master switch of six-way valve, connects motorised valve 5 through the pipeline, switch C803 connects intermediate container C7 that is equipped with crude oil, switch D804 connects vacuum pump 13, switch E805 connects intermediate container D10 that is equipped with water or washing liquid, switch F806 connects advection pump 12.
A vacuum pressure gauge 11 is arranged on a pipeline connected with the switch D804 and the vacuum pump 13, and a pressure gauge B9 is arranged on a pipeline connected with the switch F806 and the advection pump 12.
The vacuum pressure gauge is a gauge for measuring the pressure less than the atmospheric pressure by taking the atmospheric pressure as a reference and is generally used for a place with negative pressure; the pressure gauge is a gauge indicating a pressure higher than ambient. The pipeline that switch D and vacuum pump are connected adopts the vacuum pressure gauge in order to take out the shale rock core vacuum in the saturated infiltration cabin, promptly under the vacuum pump effect, take out the gas in the shale rock core hole, avoid the oil gas two-phase existence great resistance and the circumstances that the oil does not take place to saturate when saturated oil, adopt the effect of vacuum pressure gauge to be the vacuum pump during operation of detection can guarantee always be the negative pressure state to the pipeline has the condition that the seal is bad or blocks up.
Example 5:
the shale core high-temperature high-pressure saturation, fracturing and imbibition integrated device is shown in embodiment 1, and is different in that the electric valve is an electric three-way valve and comprises an electric pin 504, an inlet 501 and two outlets, namely an outlet A502 and an outlet B503, wherein the outlet A502 is connected with a pressurizing cabin 3, and the outlet B503 is connected with a saturation imbibition cabin 2. The electric pin has three gears, as shown in fig. 2, including 1 gear, 2 gear and 3 gear, when the electric pin dials 1 gear for closing the gear to block the pipeline, when the electric pin dials 2 gear, the liquid enters the pressurizing cabin, and when the electric pin dials 3 gear, the liquid enters the saturated imbibition cabin.
Example 6:
the shale core high-temperature high-pressure saturation, fracturing and imbibition integrated device is shown in the embodiment 1, except that a support frame 1901 is arranged on a ten-thousandth balance 19 as shown in fig. 3, and the support frame 1901 is used for supporting a suspension wire.
In the invention, when weighing, the support frame supports the suspension wire, so that weighing errors caused by the contact of the suspension wire with the balance are avoided, the lower part of the suspension wire is connected with the fracturing pipe and the dry rock core, and the mass of the support frame, the mass of the suspension wire and the mass of the fracturing pipe are known and unchanged, so that the weighing of the rock core can be performed.
Example 7:
an experimental method of a shale core high-temperature high-pressure saturation, fracturing and imbibition integrated device comprises the following steps:
(1) Firstly, placing the dried shale core 1 into a saturated imbibition cabin 2, switching off a two-way switch 15, measuring the weight M0 of the dry core and a fracturing pipe by using a ten-thousandth balance 19, adjusting an electric valve 5 to enable the saturated imbibition cabin 2 to be connected with a six-way valve 8, switching on a switch B802 and a switch D804, switching off the other switches, switching off the two-way switch 15, and switching on a vacuum pump 13 to vacuumize the shale core;
(2) After the vacuumizing is finished, a six-way valve switch B802 and a switch C803 are opened, the rest switches are closed, crude oil in a middle container C7 spontaneously enters a saturated seepage and suction cabin 2 under the action of pressure difference, an electric valve 5 is closed after the spontaneous oil suction is finished, a switch B802, a switch E805 and a switch F806 are opened, cleaning liquid in a middle container D10 is cleaned on a pipeline under the action of a advection pump 12, cleaning liquid in the middle container D10 is changed into clean water after the cleaning is finished, the electric valve is regulated to enable the six-way valve to be communicated with a pressurizing cabin, the advection pump 12 is used for pushing clean water in the middle container D to pressurize the pressurizing cabin, the pressure is detected by a pressure gauge B9 to ensure that the pressure is higher than the set saturated pressure by 2MPa, the reason that the saturated seepage and suction cabin is made of rubber is ensured, and the pressurizing cabin plays a role of confining pressure to ensure that the rubber cannot expand;
(3) The electric valve is regulated to disconnect the pressurizing cabin 3 from the six-way valve 8, the saturation imbibition cabin 2 is replaced by being connected with the six-way valve 8, the heating sleeve 4 is opened to enable the system to reach 100 ℃, the switch B802, the switch C803 and the switch F806 of the six-way valve are opened, the advection pump 12 is utilized to push crude oil in the middle container C7 to enter the saturation imbibition cabin to reach the set pressure of 30MPa, pressurizing and saturating are carried out for two weeks, the pressure gauge B9 is utilized to detect the pressure during the period, and if the pressure is reduced, the advection pump 12 is opened to supplement the pressure;
(4) After the core is saturated, opening a switch B802 and a switch C803 of a six-way valve to enable redundant crude oil in a saturated seepage and suction cabin to flow into an intermediate container C7, standing for 1-2 days, weighing the total weight of the fracturing pipe and the saturated oil core by using a ten-thousandth balance 19, calculating saturated oil quantity, opening a switch B802, a switch E805 and a switch F806 of the six-way valve, closing other six-way valve switch regulating electric valves to enable a pressurizing cabin 3 to be communicated with the six-way valve 8, enabling liquid in the pressurizing cabin to flow into the intermediate container D10 under the action of pressure difference, playing a role of cleaning a pipeline, replacing dirty water in the intermediate container D10, pressurizing the pressurizing cabin 3 by using a advection pump 12 until the pressure is greater than the shale core fracture pressure by 2MPa, closing all switches of the six-way valve when the pressure reaches the specified pressure, and preparing the shale core to be fractured;
(5) The two-way switch 15 is opened, the three-way switch 17 is switched to disconnect the visual glass tube 18 from the pipeline, the control switch 20 is opened, the fracturing fluid in the intermediate container A is pushed by the pressurizing pump to fracture the shale core, the pressure gauge A21 is used for detecting the pressure, the pressure corresponds to the fracture pressure of the core, the pressure is prevented from being too large or too small, and when the pressure suddenly drops to a certain value, the success of the core fracture is indicated;
(6) After the fracturing is finished, the control switch 20 is closed, the electric valve is opened to enable the saturated imbibition cabin 2 to be communicated with the six-way valve through a pipeline, the switch B802 and the switch E805 of the six-way valve are opened to enable redundant fracturing fluid to flow into the middle container D10, the switch E805 is closed, the switch A801, the switch B802 and the switch F806 are opened, imbibition fluid in the middle container B6 is injected into the saturated imbibition cabin 2 by using the advection pump 12, the injection pressure is detected by using the pressure gauge B9, when the pressure reaches the experimental pressure (the experimental pressure is assumed to be 8 MPa), all the switches of the six-way valve are closed, the shale which is saturated with oil and has been fractured is subjected to spontaneous imbibition under high temperature and high pressure, the imbibition oil quantity floats up to the visual glass tube 18 under the buoyancy effect, and the imbibition oil quantity is recorded in different time periods so as to calculate the imbibition speed and the final imbibition recovery ratio.
Example 8:
an experimental method of a shale core high-temperature high-pressure saturation, fracturing and imbibition integrated device is as shown in the embodiment 7, except that the total weight of the shale core is M00 after a ten-thousandth balance is used for weighing a fracturing pipe and saturated oil, and the saturated oil mass is M1=M00-M0;
the imbibition speed is calculated according to the oil quantity observed in the visual glass tube within a certain time, for example, the oil quantity in the visual glass tube is 0.01mL for the first 6 hours, the imbibition speed is 0.01mL/6 hours at the moment, the oil quantity in the visual glass tube is 0.03mL after the lapse of 6 hours, and the imbibition speed is (0.03-0.01) =0.02 mL/6 hours at the moment;
imbibition recovery ratioWherein, the method comprises the steps of, wherein,V 1 to visualize the oil volume in the glass tube after the end of the imbibition,V total (S) Is saturated oil volume>ρ is the saturated oil density, which is known.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the present invention.
Claims (7)
1. The shale core high-temperature high-pressure saturation, fracturing and imbibition integrated device is characterized by comprising a pressurizing cabin, wherein the pressurizing cabin is a steel container, flange covers are arranged on the upper part and the lower part of the pressurizing cabin to form a sealed container, and two holes are respectively formed in two sides of the flange cover at the upper part and are respectively used for placing a thermometer and an exhaust valve;
the outside of the pressurizing cabin is sleeved with a heating sleeve so as to simulate a high-temperature environment, the upper flange cover of the pressurizing cabin is connected with a saturated infiltration cabin, a shale core is placed in the saturated infiltration cabin, a counter bore matched with a fracturing pipe is processed at the upper part of the core, the fracturing pipe is inserted into the counter bore, and the fracturing pipe is connected with the flange cover at the upper part of the pressurizing cabin through sealing threads;
the fracturing pipe extends out of the pressurizing cabin and is connected with a two-way switch, the two-way switch is connected with a three-way switch through a pipeline, the upper part of the three-way switch is connected with a high-pressure-resistant visual glass pipe with scales, the right end of the three-way switch is connected with a pressurizing pump through a pipeline, and the pipeline is provided with a pressure gauge A, an intermediate container A for containing fracturing fluid and a control switch;
a suspension wire is wound on the fracturing pipe body, and the upper part of the suspension wire penetrates through a ten-thousandth balance and is used for measuring the weight of shale core before and after saturation;
the bottom of the saturated imbibition cabin is connected with a six-way valve through a pipeline, an electric valve is arranged on the pipeline and used for controlling the on-off of the six-way valve and the saturated imbibition cabin and the six-way valve and the pressurizing cabin, and the six-way valve is connected with an intermediate container filled with different liquids, a vacuum pump used for vacuumizing a rock core and a advection pump used for pushing a piston of the intermediate container;
the six-way valve comprises 6 switches, namely a switch A, a switch B, a switch C, a switch D, a switch E and a switch F, wherein the switch A is connected with a middle container B filled with seepage liquid;
a vacuum pressure gauge is arranged on a pipeline connected with the switch D and the vacuum pump, and a pressure gauge B is arranged on a pipeline connected with the switch F and the advection pump;
the electric valve is an electric three-way valve and comprises an electric pin, an inlet and two outlets, namely an outlet A and an outlet B, wherein the outlet A is connected with the pressurizing cabin, and the outlet B is connected with the saturated imbibition cabin;
the experimental method of the shale core high-temperature high-pressure saturation, fracturing and imbibition integrated device comprises the following steps:
(1) Firstly, placing the dried shale core into a saturated imbibition cabin, switching off a two-way switch, measuring the weight M0 of the dry core and a fracturing pipe by using a ten-thousandth balance, adjusting an electric valve to enable the saturated imbibition cabin to be connected with a six-way valve, switching on a switch B and a switch D, switching off other switches, switching off the two-way switch, and switching on a vacuum pump to vacuumize the shale core;
(2) After the vacuumizing is finished, a six-way valve switch B and a switch C are opened, the rest switches are closed, crude oil in the middle container C spontaneously enters a saturated seepage and absorption cabin under the action of pressure difference, after the spontaneous oil absorption is finished, an electric valve is closed, a switch B, a switch E and a switch F are opened, cleaning liquid in the middle container D is cleaned on a pipeline under the action of a advection pump, cleaning liquid in the middle container D is changed into clean water after the cleaning is finished, the electric valve is regulated to enable the six-way valve to be communicated with a pressurizing cabin, the pressure gauge B is used for detecting the pressure to ensure that the pressure is higher than the set saturated pressure by 2MPa, and the clean water in the middle container D is pushed by the advection pump to pressurize the pressurizing cabin;
(3) The electric valve is regulated to disconnect the pressurizing cabin from the six-way valve, the saturation suction cabin is replaced to be connected with the six-way valve, the heating sleeve is opened to enable the system to reach the designated temperature, the switch B, the switch C and the switch F of the six-way valve are opened, crude oil in the middle container C is pushed to enter the saturation suction cabin by the advection pump to reach the set pressure, pressurization and saturation are carried out for two weeks, the pressure gauge B is used for detecting the pressure during the period, and if the pressure is reduced, the advection pump is opened to supplement the pressure;
(4) After the core is saturated, opening a switch B and a switch C of a six-way valve to enable redundant crude oil in a saturated imbibition cabin to flow into an intermediate container C, standing for 1-2 days, weighing the total weight of the core after a fracturing pipe and saturated oil by using a ten-thousandth balance, calculating saturated oil quantity, opening a switch B, a switch E and a switch F of the six-way valve, closing other six-way valve switch regulating electric valves to enable a pressurizing cabin to be communicated with the six-way valve, enabling liquid in the pressurizing cabin to flow into the intermediate container D under the action of pressure difference, playing a role of cleaning a pipeline, replacing dirty water in the intermediate container D, pressurizing the pressurizing cabin by using a advection pump until the pressure is greater than the shale core fracturing pressure by 2MPa, closing all switches of the six-way valve and preparing the fracturing core;
(5) The two-way switch is turned on, the three-way switch is switched to disconnect the visual glass tube from the pipeline, the control switch is turned on, the fracturing fluid in the intermediate container A is pushed by the pressurizing pump to fracture the shale core, and the pressure gauge A is used for detecting the pressure;
(6) When the fracturing is finished, the control switch is closed, the electric valve is opened to enable the saturated imbibition cabin to be communicated with the six-way valve through a pipeline, the switch B and the switch E of the six-way valve are opened to enable redundant fracturing fluid to flow into the middle container D, the switch E is closed, the switch A, the switch B and the switch F are opened, imbibition fluid in the middle container B is injected into the saturated imbibition cabin by using the advection pump, the injection pressure is detected by using the pressure gauge B, when the pressure reaches experimental pressure, all the switches of the six-way valve are closed to enable the shale core which is saturated with oil and has been fractured to spontaneously imbibite under high temperature and high pressure, the imbibition oil volume floats to a visual glass tube through a fracturing tube under the buoyancy effect, and the imbibition oil volume is recorded in different time periods so as to calculate imbibition speed and final imbibition recovery ratio.
2. The shale core high-temperature and high-pressure saturation, fracturing and imbibition integrated device according to claim 1, wherein the saturated imbibition cabin is connected with the upper flange cover of the pressurizing cabin through steel threads, the upper part of the steel threads is connected with the flange cover of the pressurizing cabin through threads, and the lower part of the steel threads is connected with the pressurizing imbibition cabin through interference fit.
3. The shale core high-temperature and high-pressure saturation, fracturing and imbibition integrated device according to claim 1, wherein the saturation imbibition cabin is made of fluorine-containing rubber with high temperature resistance and high pressure resistance.
4. The shale core high-temperature and high-pressure saturation, fracturing and imbibition integrated device according to claim 1, wherein a support frame is arranged on the ten-thousandth balance and is used for supporting a suspension wire.
5. The shale core high-temperature high-pressure saturation, fracturing and imbibition integrated device according to claim 1, wherein the heating sleeve in the step (3) is heated to enable the system temperature to reach 80-150 ℃, and the set pressure is 20-45MPa when crude oil enters a saturated imbibition cabin.
6. The shale core high-temperature and high-pressure saturation, fracturing and imbibition integrated device according to claim 5, wherein the accuracy of the visual glass tube is 0.01mL.
7. The shale core high-temperature and high-pressure saturation, fracturing and imbibition integrated device according to claim 6, wherein the saturated oil mass m1=m00-M0 assuming that the total weight of the core after weighing the fracturing pipe and the saturated oil by a ten-thousandth balance is M00;
the imbibition speed is calculated according to the oil quantity observed in the visual glass tube within a certain time;
imbibition recovery ratioWherein, the method comprises the steps of, wherein,V 1 to visualize the oil volume in the glass tube after the end of the imbibition,V total (S) Is saturated oil volume>ρ is the saturated oil density, which is known.
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