CN111980646A - Imbibition oil displacement effect evaluation device and use method - Google Patents
Imbibition oil displacement effect evaluation device and use method Download PDFInfo
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- CN111980646A CN111980646A CN202011015417.7A CN202011015417A CN111980646A CN 111980646 A CN111980646 A CN 111980646A CN 202011015417 A CN202011015417 A CN 202011015417A CN 111980646 A CN111980646 A CN 111980646A
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- 238000005213 imbibition Methods 0.000 title claims abstract description 59
- 238000006073 displacement reaction Methods 0.000 title claims abstract description 39
- 230000000694 effects Effects 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000011156 evaluation Methods 0.000 title claims abstract description 22
- 239000012530 fluid Substances 0.000 claims abstract description 74
- 239000003513 alkali Substances 0.000 claims abstract description 56
- 239000002253 acid Substances 0.000 claims abstract description 51
- 238000010438 heat treatment Methods 0.000 claims abstract description 5
- 239000003921 oil Substances 0.000 claims description 71
- 239000003795 chemical substances by application Substances 0.000 claims description 23
- 239000010779 crude oil Substances 0.000 claims description 20
- 239000002585 base Substances 0.000 claims description 18
- 238000010521 absorption reaction Methods 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 9
- 238000005406 washing Methods 0.000 claims description 7
- 229920006395 saturated elastomer Polymers 0.000 claims description 6
- 230000002378 acidificating effect Effects 0.000 claims description 3
- 239000000243 solution Substances 0.000 abstract description 55
- 239000011435 rock Substances 0.000 abstract description 19
- 230000008569 process Effects 0.000 abstract description 9
- 238000011161 development Methods 0.000 abstract description 3
- 238000002347 injection Methods 0.000 abstract description 2
- 239000007924 injection Substances 0.000 abstract description 2
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 4
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000035699 permeability Effects 0.000 description 4
- 230000002269 spontaneous effect Effects 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 229910001870 ammonium persulfate Inorganic materials 0.000 description 2
- 230000000844 anti-bacterial effect Effects 0.000 description 2
- 239000003899 bactericide agent Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 229920013818 hydroxypropyl guar gum Polymers 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 239000001103 potassium chloride Substances 0.000 description 2
- 235000011164 potassium chloride Nutrition 0.000 description 2
- 239000006004 Quartz sand Substances 0.000 description 1
- 239000004063 acid-resistant material Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003027 oil sand Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000011158 quantitative evaluation Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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- 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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
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- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
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- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention relates to an evaluation device and a use method for an imbibition oil displacement effect, belonging to the field of oil and gas development and relating to an evaluation device and a use method for an imbibition oil displacement effect, wherein the evaluation device comprises a piston container, a piston is arranged in the piston container, and the inner area of the piston container is divided into a solution cavity and a pressure cavity; the number of the piston containers is three, the piston containers are respectively a first piston container, a second piston container and a third piston container, and solution cavities of the first piston container, the second piston container and the third piston container are respectively connected with the same six-way valve through solution outlet valves; the front end of the inlet of the piston container is provided with the fluid pressurizing device, so that the pressurizing pump injection process of fracturing fluid entering a stratum can be simulated. The acid and alkali resistant core holder is provided with a heating structure, can simulate the temperature of a reservoir, is provided with confining pressure, can simulate the pressure of an overlying rock stratum of a stratum, and has temperature and pressure conditions closer to real stratum conditions.
Description
Technical Field
The invention belongs to the field of oil and gas development, and relates to a device for evaluating an imbibition oil displacement effect and a using method thereof.
Background
The low-permeability oil and gas reserves of China account for more than 65% of the oil and gas reserves of China, and the low-permeability oil and gas reservoirs are widely distributed. The low permeability reservoir has poor and uneven physical properties, and the capacity can be obtained only by fracturing modification. The method is characterized in that a compact reservoir stratum is usually developed by horizontal well fracturing, only 10-50% of fracturing fluid can be discharged back in the fracturing process, the flow-back rate is low, and the reservoir stratum is damaged to a certain extent. The seepage agent is added into the fracturing fluid, the flowback fluid is not required to be treated after fracturing, and the residual fracturing fluid left in the stratum can supplement the stratum energy and also has the functions of seepage and oil displacement, so that the fracturing flowback fluid is changed into valuable, and the development effect of a low-permeability oil reservoir is improved.
The existing imbibition experimental device is mainly based on two measurement methods, namely a volume method and a mass method, wherein the volume method is used for calculating the liquid displacement between a solution and a rock core by measuring the volume of crude oil or an imbibition system solution, and calculating the extraction degree by recording the change of the imbibition oil production along with time, so as to evaluate the oil displacement effect; the weighing method is to calculate the imbibition result by measuring the weight change condition of the rock core or the imbibition system solution.
Most of the existing evaluation devices for the imbibition and oil displacement effects can only evaluate the spontaneous imbibition effect of the imbibition agent. For example, patent 201310451182.X reports a quantitative evaluation method for imbibition oil production effect of an imbibition agent, and relates to a method for measuring spontaneous imbibition efficiency value of an imbibition agent on oil sand prepared by mixing quartz sand or natural sand or a crude oil saturated rock core, which is a spontaneous imbibition process, and cannot simulate the whole imbibition process of a real stratum condition, wherein a fracturing fluid is injected into a rock by a pressure pump under the condition that the rock exists at an overlying rock layer pressure and a stratum temperature, and a fracturing fluid gel breaking residual liquid enters the rock after the fracturing is finished and the pump is stopped, and a fracturing fluid residual liquid is used as an imbibition oil displacement agent. The invention patent CN201910802792.7 discloses an imbibition agent evaluation experimental device and method for imbibition oil production, the device comprises an imbibition bottle and an imbibition pipe, the imbibition oil production experiment can be carried out at high temperature, the imbibition effect of stratum matrix rock under a certain temperature condition can be simulated, but the device is also a spontaneous imbibition process, the fracturing fluid is pumped into the stratum under the condition that the rock is under the overlying stratum pressure, and the fracturing fluid gel breaking residual liquid enters the stratum after the fracturing is finished and the fracturing fluid residual liquid is used as the imbibition oil displacement agent. The two devices do not adopt acid-resistant materials, and the seepage and oil displacement effect of the seepage and oil displacement agent added into the acid fracturing fluid cannot be evaluated.
In order to simulate the process that fracturing fluid enters rock under the temperature and pressure state close to the stratum condition, the seepage process that fracturing fluid residual liquid is used as a seepage and absorption oil displacement agent in the stratum after fracturing is finished, and measure the seepage and absorption oil displacement effect of different seepage and absorption oil displacement agents added into the fracturing fluid, a seepage and absorption oil displacement effect evaluation device is designed, and a using method of the device is provided.
Disclosure of Invention
The invention aims to provide an evaluation device and an application method for the imbibition oil displacement effect, aiming at the problem that the existing evaluation device and application method for the imbibition oil displacement effect cannot simulate the real fracturing process and the formation temperature and pressure conditions.
The invention relates to an evaluation device for an imbibition oil displacement effect, which comprises a piston container, wherein a piston is arranged in the piston container, and the inner area of the piston container is divided into a solution cavity and a pressure cavity; the number of the piston containers is three, the piston containers are respectively a first piston container, a second piston container and a third piston container, solution cavities of the first piston container, the second piston container and the third piston container are respectively connected with the same six-way valve through solution outlet valves, pressure cavities of the first piston container, the second piston container and the third piston container are respectively connected with the same pressurizing pipeline through pressurizing valves, and a fluid pressurizing device is connected to the pressurizing pipeline;
the six-way valve is connected with a solution input pipe, and the solution input pipe is connected with a first acid and alkali resistant core holder and a second acid and alkali resistant core holder through a first solution inlet valve and a second solution inlet valve respectively;
the first acid-alkali-resistant core holder is connected with a first oil seepage and absorption and oil removal outlet through a first outlet valve;
the second acid-alkali-resistant core holder is connected with a second oil seepage and absorption and oil removal outlet through a second outlet valve;
the first acid-base-resistant core holder and the second acid-base-resistant core holder are also connected with confining pressure devices, and heating structures are arranged on the first acid-base-resistant core holder and the second acid-base-resistant core holder;
and different types of water-based fracturing fluids are filled in the solution cavities of the first piston container, the second piston container and the third piston container.
Preferably, the confining pressure device comprises a manual pump, the manual pump is connected with a first confining pressure adding pipeline and a second confining pressure adding pipeline through a confining pressure outlet main valve, and one end, far away from the confining pressure outlet main valve, of the first confining pressure adding pipeline is connected with the middle part of the first acid-base-resistant core holder;
one end of the second confining pressure adding pipeline, which is far away from the confining pressure outlet main valve, is connected with the middle part of the second acid and alkali resistant core holder;
a first confining pressure inlet valve is arranged on the first confining pressure adding pipeline, and a second confining pressure inlet valve is arranged on the second confining pressure adding pipeline;
a pressure gauge is arranged on a first confining pressure adding pipeline between the first acid and alkali resistant core holder and the first confining pressure inlet valve, and a pressure gauge is also arranged on a second confining pressure adding pipeline between the second acid and alkali resistant core holder and the second confining pressure inlet valve.
Preferably, the pipelines between the solution chambers of the first piston container, the second piston container and the third piston container and the connected solution outlet valve are all provided with a vent valve.
Preferably, the pressurizing pipeline is connected with a first pressure sensor, and the solution input pipe is connected with a second pressure sensor.
Preferably, the fluid pressurizing means is a piston reservoir pressurizing pump.
Or preferably, the first piston container is made of 316L material, the volume of the first piston container is 1000mL, and the pressure resistance is 50 MPa.
Preferably, the second piston container is made of 316L material, the volume of the second piston container is 1000mL, and the pressure resistance is 50 MPa.
Preferably, the third piston container is made of HC276 material, and the volume of the third piston container is 200mL, and the pressure resistance is 50 MPa.
Preferably, the first acid and alkali resistant core holder and the second acid and alkali resistant core holder are both TY-4 acid and alkali resistant core holders, and the manufacturer: south-bound huaxing petroleum instruments ltd.
The application method of the imbibition oil displacement effect evaluation device is characterized by comprising the following steps:
(1) assembling cores saturated by crude oil on the first acid-and-alkali-resistant core holder and the second acid-and-alkali-resistant core holder, closing a first solution inlet valve, a second solution inlet valve, a first outlet valve and a second outlet valve, opening a confining pressure outlet main valve, a first confining pressure inlet valve and a second confining pressure inlet valve, and adding confining pressure to the first acid-and-alkali-resistant core holder and the second acid-and-alkali-resistant core holder by using a manual pump;
(2) according to the experimental requirements, filling different water-based fracturing fluids in solution cavities of a first piston container and a second piston container, filling acidic fracturing fluid in a solution cavity of a third piston container, adding different imbibing agents and the same gel breaker in the fracturing fluid in the first piston container, the second piston container and the third piston container, opening a solution outlet valve and a pressurizing valve which are connected with the first piston container, the second piston container or the third piston container and corresponding valves on a six-way valve according to the experimental requirements after the fracturing fluid is broken, starting a fluid pressurizing device to pressurize the piston containers, then opening a first solution inlet valve, a second solution inlet valve, a first outlet valve and a second outlet valve, driving the fracturing fluid in the first piston container, the second piston container or the third piston container into a first acid-and alkali-resistant core holder and a second acid-alkali-resistant core holder, when liquid flows out of the first outlet of the imbibition stripping oil and the second outlet of the imbibition stripping oil, closing the first outlet valve and the second outlet valve, closing a solution outlet valve and a pressurizing valve which are connected with the first piston container, the second piston container or the third piston container, closing the fluid pressurizing device, and allowing fracturing fluid to be fully imbibed in the rock core for 24 hours;
(3) opening a first outlet valve and a second outlet valve, collecting oil water which is absorbed and removed at a first outlet of the absorption and removal oil and a second outlet of the absorption and removal oil, and measuring the volume of the removed crude oil by using a measuring cylinder;
(4) and evaluating the oil displacement and washing effects of the different imbibition agents added into the fracturing fluid by measuring the volume of the removed crude oil, wherein the larger the volume of the removed crude oil is, the better the oil displacement and washing effects of the imbibition agents are.
The invention has the beneficial effects that:
(1) the front end of the inlet of the piston container is provided with the fluid pressurizing device, so that the pressurizing pump injection process of fracturing fluid entering a stratum can be simulated.
(2) The acid and alkali resistant core holder is provided with a heating structure, can simulate the temperature of a reservoir, is provided with confining pressure, can simulate the pressure of an overlying rock stratum of a stratum, and has temperature and pressure conditions closer to real stratum conditions.
(3) The invention adopts three piston containers, one of which is an acid-resistant piston container, can evaluate the seepage and oil displacement effects of various different seepage and oil displacement water-based fracturing fluids including acid fracturing fluid, and has wide coverage of evaluated fracturing fluid types.
(4) The invention adopts a six-way valve which can be switched freely in three piston containers, and is simple and easy to operate.
(5) The invention designs two acid and alkali resistant heatable rock core holders, and can simultaneously evaluate the imbibition oil displacement effect of an imbibition oil displacement fracturing fluid in different permeability.
Drawings
FIG. 1 is a schematic view of a connection relationship of an evaluation device for oil displacement by imbibition according to the present invention.
Reference numerals: 1-a piston container pressure pump, 2-a first piston container, 3-an emptying valve, 4-a pressure valve, 5-a solution outlet valve, 6-a second piston container, 7-a third piston container, 8-a first pressure sensor, 9-a six-way valve, 10-a second solution inlet valve, 11-a first solution inlet valve, 12-a second acid and alkali resistant core holder, 13-a first acid and alkali resistant core holder, 14-a pressure gauge, 15-a second outlet valve, 16-a first outlet valve, 17-a first confining pressure inlet valve, 18-a second oil seepage and removal outlet, 19-a first oil seepage and removal outlet, 20-a second confining pressure inlet valve, 21-a confining pressure outlet main valve, 22-a manual pump and 23-a second pressure sensor.
Detailed Description
The invention relates to an evaluation device for an imbibition oil displacement effect, which comprises a piston container, wherein a piston is arranged in the piston container, and the inner area of the piston container is divided into a solution cavity and a pressure cavity; the number of the piston containers is three, the piston containers are respectively a first piston container 2, a second piston container 6 and a third piston container 7, solution cavities of the first piston container 2, the second piston container 6 and the third piston container 7 are respectively connected with the same six-way valve 9 through a solution outlet valve 5, pressure cavities of the first piston container 2, the second piston container 6 and the third piston container 7 are respectively connected with the same pressurizing pipeline through a pressurizing valve 4, and a fluid pressurizing device is connected to the pressurizing pipeline;
the six-way valve 9 is connected with a solution input pipe, and the solution input pipe is respectively connected with a first acid and alkali resistant core holder 13 and a second acid and alkali resistant core holder 12 through a first solution inlet valve 11 and a second solution inlet valve 10;
the first acid and alkali resistant core holder 13 is connected with a first oil seepage and absorption and removal outlet port 19 through a first outlet valve 16;
the second acid and alkali resistant core holder 12 is connected with a second outlet 18 for oil seepage and absorption and removal through a second outlet valve 15;
the first acid-base-resistant core holder 13 and the second acid-base-resistant core holder 12 are also connected with confining pressure devices, and the first acid-base-resistant core holder 13 and the second acid-base-resistant core holder 12 are both provided with heating structures;
the solution cavities of the first piston container 2, the second piston container 6 and the third piston container 7 are filled with different types of water-based fracturing fluids.
The confining pressure device comprises a manual pump 22, the manual pump 22 is connected with a first confining pressure adding pipeline and a second confining pressure adding pipeline through a confining pressure outlet main valve 21, and one end, far away from the confining pressure outlet main valve 21, of the first confining pressure adding pipeline is connected with the middle of the first acid-base-resistant core holder 13;
one end of the second confining pressure adding pipeline, which is far away from the confining pressure outlet main valve 21, is connected with the middle part of a second acid and alkali resistant core holder 12;
a first confining pressure inlet valve 17 is arranged on the first confining pressure adding pipeline, and a second confining pressure inlet valve 20 is arranged on the second confining pressure adding pipeline;
a pressure gauge 14 is arranged on a first confining pressure adding pipeline between the first acid and alkali resistant core holder 13 and the first confining pressure inlet valve 17, and a pressure gauge 14 is also arranged on a second confining pressure adding pipeline between the second acid and alkali resistant core holder 12 and the second confining pressure inlet valve 20.
And vent valves 3 are arranged on pipelines between the solution cavities of the first piston container 2, the second piston container 6 and the third piston container 7 and the connected solution outlet valve 5.
The pressurizing pipeline is connected with a first pressure sensor 8, and the solution input pipe is connected with a second pressure sensor 23.
The fluid pressurizing means is a piston container pressurizing pump 1.
The first piston container 2 is a first piston container 2 made of 316L material, the volume of the first piston container 2 is 1000mL, and the pressure resistance is 50 MPa.
The second piston container 6 is a second piston container 6 made of 316L material, the volume of the second piston container 6 is 1000mL, and the pressure resistance is 50 MPa.
The third piston container 7 is made of HC276 material, the volume of the third piston container 7 is 200mL, and the pressure resistance is 50 MPa.
The first acid and alkali resistant core holder 13 and the second acid and alkali resistant core holder 12 are both TY-4 acid and alkali resistant core holders, and the manufacturer: south-bound huaxing petroleum instruments ltd.
The application method of the imbibition oil displacement effect evaluation device is characterized by comprising the following steps:
(1) assembling cores saturated by crude oil on a first acid and alkali resistant core holder 13 and a second acid and alkali resistant core holder 12, closing a first solution inlet valve 11, a second solution inlet valve 10, a first outlet valve 16 and a second outlet valve 15, opening a confining pressure outlet main valve 21, a first confining pressure inlet valve 17 and a second confining pressure inlet valve 20, and applying confining pressure to the first acid and alkali resistant core holder 13 and the second acid and alkali resistant core holder 12 by using a manual pump 22;
(2) according to the experiment requirement, different water-based fracturing fluids are filled in solution cavities of a first piston container 2 and a second piston container 6, acidic fracturing fluid is filled in a solution cavity of a third piston container 7, the fracturing fluids in the first piston container 2, the second piston container 6 and the third piston container 7 are added with an imbibing agent and a gel breaker, after the fracturing fluid is broken, a solution outlet valve 5, a pressurizing valve 4 and a corresponding valve on a six-way valve 9 which are connected with the first piston container 2, the second piston container 6 or the third piston container 7 are opened according to the experiment requirement, a fluid pressurizing device is started to pressurize the piston containers, then a first solution inlet valve 11, a second solution inlet valve 10, a first outlet valve 16 and a second outlet valve 15 are opened, the fracturing fluid in the first piston container 2, the second piston container 6 or the third piston container 7 is driven into a first acid and alkali resistant core holder 13 and a second acid and alkali resistant core holder 12, when liquid flows out of the first outlet 19 and the second outlet 18 of the imbibed and stripped oil, closing the first outlet valve 16 and the second outlet valve 15, closing the solution outlet valve 5 and the pressurizing valve 4 which are connected with the first piston container 2, the second piston container 6 or the third piston container 7, and closing the fluid pressurizing device to ensure that fracturing fluid is fully imbibed in the rock core for 24 hours;
(3) opening a first outlet valve 16 and a second outlet valve 15, collecting oil water which is absorbed and removed from the oil by the absorption and removal first outlet 19 and the absorption and removal second outlet 18, and measuring the volume of the removed crude oil by a measuring cylinder;
(4) and evaluating the oil displacement and washing effects of the different imbibition agents added into the fracturing fluid by measuring the volume of the removed crude oil, wherein the larger the volume of the removed crude oil is, the better the oil displacement and washing effects of the imbibition agents are.
Example one
The permeability is 1.1X 10-3μm2After the natural rock core is fully saturated by crude oil, the natural rock core is arranged on a first acid and alkali resistant rock core holder 13, a first solution inlet valve 11 and a first outlet valve 16 are closed, a confining pressure outlet main valve 21 and a first confining pressure inlet valve 17 are opened, and a manual pump 22 is adopted to apply confining pressure to the first acid and alkali resistant rock core holder 13; the emptying valve 3 connected to the first piston container 2 is closed, and the additive is added to the first piston container 21L of formula I fracturing fluid is added, and the formula of the fracturing fluid is as follows: 0.3% of hydroxypropyl guar gum, 1% of potassium chloride, 0.1% of bactericide CJSJ-1+0.3% of imbibing agent CRS +0.03% of gel breaker ammonium persulfate, after gel breaking of the fracturing fluid, opening a solution outlet valve 5 and a pressurizing valve 4 which are connected with a first piston container 2 and corresponding valves on a six-way valve 9, opening the piston container pressurizing pump 1 to pressurize the first piston container 2, opening a valve first solution inlet valve 11 and a valve first outlet valve 16 to drive the fracturing fluid gel breaking fluid in the first piston container 2 into a first acid-base-resistant core holder 13, and when liquid flows out from a first imbibition deoiling first outlet 19, closing the solution outlet valve 5 and the pressurizing valve 4 which are connected with the first piston container 2, closing the piston container pressurizing pump 1 to ensure that the fracturing fluid is fully imbibed in the core for 24 hours; (3) the first outlet valve 16 is opened, the oil-water which is absorbed and removed is collected at the first outlet 19 of the oil which is absorbed and removed, and the volume of the crude oil which is removed is measured by a measuring cylinder. Metering: crude oil imbibed from the imbibed oil first outlet 19 was 2.15 mL.
Example two
The permeability is 1.08 multiplied by 10-3μm2After the natural core is fully saturated by crude oil, the natural core is arranged on a second acid and alkali resistant core holder 12, a second solution inlet valve 10 and a second outlet valve 15 are closed, a confining pressure outlet main valve 21 and a second confining pressure inlet valve 20 are opened, and a manual pump 22 is adopted to apply confining pressure to the second acid and alkali resistant core holder 12; closing an emptying valve 3 connected with a second piston container 6, adding 1L of second formula fracturing fluid into the second piston container 6, wherein the formula of the fracturing fluid is as follows: 0.3% of hydroxypropyl guar gum, 1% of potassium chloride, 0.1% of bactericide CJSJ-1+0.3% of imbibing agent TGF-1+0.03% of gel breaker ammonium persulfate, after gel breaking of the fracturing fluid, opening a solution outlet valve 5 and a pressurizing valve 4 which are connected with a second piston container 6 and corresponding valves on a six-way valve 9, opening a piston container pressurizing pump 1 to pressurize the second piston container 6, opening a second solution inlet valve 10 and a second outlet valve 15, driving the fracturing fluid gel breaking fluid in the second piston container 6 into a second acid-base-resistant core holder 12, when liquid flows out from a second outlet 18 of imbibition deoiling oil, closing the solution outlet valve 5 and the pressurizing valve 4 which are connected with the second piston container 6, closing the piston container pressurizing pump 1, and enabling the fracturing fluid to be fully imbibed in the core for 24 hours; (3) opening the firstAnd a second outlet valve 15 for collecting the oil-water which is absorbed and removed from the oil absorption and removal second outlet 18, and measuring the volume of the removed crude oil by using a measuring cylinder. Metering: the crude oil imbibed from the second imbibed oil outlet 18 was 1.5 mL. By contrast, the oil displacement and washing effect of the imbibition agent 1 in the fracturing fluid of the first formula is superior to that of the imbibition agent 2 in the fracturing fluid of the second formula.
Claims (10)
1. An evaluation device for oil displacement effect by imbibition comprises a piston container, wherein a piston is arranged in the piston container, and the inner area of the piston container is divided into a solution cavity and a pressure cavity; the device is characterized in that the number of the piston containers is three, the piston containers are respectively a first piston container (2), a second piston container (6) and a third piston container (7), solution cavities of the first piston container (2), the second piston container (6) and the third piston container (7) are respectively connected with the same six-way valve (9) through solution outlet valves (5), pressure cavities of the first piston container (2), the second piston container (6) and the third piston container (7) are respectively connected with the same pressurizing pipeline through pressurizing valves (4), and the pressurizing pipeline is connected with a fluid pressurizing device;
the six-way valve (9) is connected with a solution input pipe, and the solution input pipe is respectively connected with a first acid and alkali resistant core holder (13) and a second acid and alkali resistant core holder (12) through a first solution inlet valve (11) and a second solution inlet valve (10);
the first acid and alkali resistant core holder (13) is connected with a first oil seepage and absorption outlet first outlet (19) through a first outlet valve (16);
the second acid and alkali resistant core holder (12) is connected with a second outlet (18) for oil seepage and absorption and removal through a second outlet valve (15);
the first acid-base-resistant core holder (13) and the second acid-base-resistant core holder (12) are also connected with confining pressure devices, and the first acid-base-resistant core holder (13) and the second acid-base-resistant core holder (12) are both provided with heating structures;
the solution cavities of the first piston container (2), the second piston container (6) and the third piston container (7) are filled with different types of water-based fracturing fluids.
2. The imbibition oil displacement effect evaluation device according to claim 1, wherein the confining pressure device comprises a manual pump (22), the manual pump (22) is connected with a first confining pressure pipeline and a second confining pressure pipeline through a confining pressure outlet main valve (21), and one end, far away from the confining pressure outlet main valve (21), of the first confining pressure pipeline is connected with the middle part of a first acid and alkali resistant core holder (13);
one end of the second confining pressure adding pipeline, which is far away from the confining pressure outlet main valve (21), is connected with the middle part of a second acid and alkali resistant core holder (12);
a first confining pressure inlet valve (17) is arranged on the first confining pressure adding pipeline, and a second confining pressure inlet valve (20) is arranged on the second confining pressure adding pipeline;
a pressure gauge (14) is arranged on a first confining pressure adding pipeline between the first acid and alkali resistant core holder (13) and the first confining pressure inlet valve (17), and a pressure gauge (14) is also arranged on a second confining pressure adding pipeline between the second acid and alkali resistant core holder (12) and the second confining pressure inlet valve (20).
3. The imbibition flooding effect evaluation device according to claim 2, characterized in that the drain valves (3) are arranged on the pipelines between the solution chambers of the first piston container (2), the second piston container (6) and the third piston container (7) and the connected solution outlet valve (5).
4. An apparatus for evaluating the effect of imbibition flooding according to claim 3, wherein the pressure line is connected with a first pressure sensor (8), and the solution input line is connected with a second pressure sensor (23).
5. The imbibition flooding effect evaluation device of claim 4, wherein the fluid pressurizing device is a piston container pressurizing pump (1).
6. The imbibition displacement effect evaluation device of any one of claims 1-5, wherein the first piston container (2) is a first piston container (2) made of 316L material, the volume of the first piston container (2) is 1000mL, and the pressure resistance is 50 MPa.
7. The apparatus for evaluating the imbibition flooding effect according to claim 6, wherein the second piston container (6) is a second piston container (6) made of 316L material, the volume of the second piston container (6) is 1000mL, and the pressure resistance is 50 MPa.
8. The apparatus for evaluating the imbibition flooding effect of claim 7, wherein the third piston container (7) is made of HC276 material, the volume of the third piston container (7) is 200mL, and the pressure resistance is 50 MPa.
9. The imbibition oil displacement effect evaluation device according to claim 8, wherein the first acid and alkali-resistant core holder (13) and the second acid and alkali-resistant core holder (12) are both TY-4 acid and alkali-resistant core holders.
10. The use method of the imbibition flooding effect evaluation device, according to the claim, is characterized in that the method comprises the following steps:
(1) assembling cores saturated by crude oil on a first acid and alkali resistant core holder (13) and a second acid and alkali resistant core holder (12), closing a first solution inlet valve (11), a second solution inlet valve (10), a first outlet valve (16) and a second outlet valve (15), opening a confining pressure outlet main valve (21), a first confining pressure inlet valve (17) and a second confining pressure inlet valve (20), and adding confining pressure to the first acid and alkali resistant core holder (13) and the second acid and alkali resistant core holder (12) by adopting a manual pump (22);
(2) according to the experimental requirements, different water-based fracturing fluids are filled in solution cavities of a first piston container (2) and a second piston container (6), acidic fracturing fluid is filled in a solution cavity of a third piston container (7), and the fracturing fluids in the first piston container (2), the second piston container (6) and the third piston container (7) are all added with an imbibing agent and a gel breaker, after the fracturing fluids are broken, a solution outlet valve (5) and a pressure valve (4) which are connected with the first piston container (2), the second piston container (6) or the third piston container (7) and corresponding valves on a six-way valve (9) are opened according to the experimental requirements, a fluid pressurizing device is started to pressurize the piston containers, then a first solution inlet valve (11), a second solution inlet valve (10), a first outlet valve (16) and a second outlet valve (15) are opened, and the fracturing fluids in the first piston container (2), the second piston container (6) or the third piston container (7) are pressurized Driving the fracturing fluid into a first acid-base-resistant core holder (13) and a second acid-base-resistant core holder (12), closing a first outlet valve (16) and a second outlet valve (15) when liquid flows out of a first outlet (19) for imbibing and removing oil and a second outlet (18) for imbibing and removing oil, closing a solution outlet valve (5) and a pressurizing valve (4) which are connected with a first piston container (2), a second piston container (6) or a third piston container (7), closing a fluid pressurizing device, and allowing fracturing fluid to be fully imbibed in the core for 24 hours;
(3) opening a first outlet valve (16) and a second outlet valve (15), collecting oil water which is absorbed and removed from the oil at a first outlet (19) and a second outlet (18) of the oil, and metering the volume of the removed crude oil by using a measuring cylinder;
(4) and evaluating the oil displacement and washing effects of the different imbibition agents added into the fracturing fluid by measuring the volume of the removed crude oil, wherein the larger the volume of the removed crude oil is, the better the oil displacement and washing effects of the imbibition agents are.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112814656A (en) * | 2021-03-17 | 2021-05-18 | 成都理工大学 | Large-scale high-temperature high-pressure simulation device and method for bottom water sandstone oil reservoir development |
| CN113848162A (en) * | 2021-09-23 | 2021-12-28 | 西南石油大学 | Experimental device and experimental method for evaluating seepage depth of fracturing fluid of high-temperature high-pressure tight oil reservoir |
| CN114441407A (en) * | 2022-01-14 | 2022-05-06 | 合肥综合性国家科学中心能源研究院(安徽省能源实验室) | Hypotonic coal rock CO2Dynamic visual simulation test system and method for displacement process |
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2020
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112814656A (en) * | 2021-03-17 | 2021-05-18 | 成都理工大学 | Large-scale high-temperature high-pressure simulation device and method for bottom water sandstone oil reservoir development |
| CN113848162A (en) * | 2021-09-23 | 2021-12-28 | 西南石油大学 | Experimental device and experimental method for evaluating seepage depth of fracturing fluid of high-temperature high-pressure tight oil reservoir |
| CN114441407A (en) * | 2022-01-14 | 2022-05-06 | 合肥综合性国家科学中心能源研究院(安徽省能源实验室) | Hypotonic coal rock CO2Dynamic visual simulation test system and method for displacement process |
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