CN111879903A - Shunting agent shunting effect testing device and method for acid treatment - Google Patents
Shunting agent shunting effect testing device and method for acid treatment Download PDFInfo
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- CN111879903A CN111879903A CN202010911884.1A CN202010911884A CN111879903A CN 111879903 A CN111879903 A CN 111879903A CN 202010911884 A CN202010911884 A CN 202010911884A CN 111879903 A CN111879903 A CN 111879903A
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- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 69
- 238000012360 testing method Methods 0.000 title claims abstract description 53
- 230000000694 effects Effects 0.000 title claims abstract description 25
- 238000010306 acid treatment Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000007788 liquid Substances 0.000 claims abstract description 83
- 238000002347 injection Methods 0.000 claims abstract description 44
- 239000007924 injection Substances 0.000 claims abstract description 44
- 239000011435 rock Substances 0.000 claims abstract description 27
- 230000035699 permeability Effects 0.000 claims abstract description 18
- 238000002474 experimental method Methods 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims abstract description 6
- 238000007789 sealing Methods 0.000 claims abstract description 4
- 238000010998 test method Methods 0.000 claims abstract description 3
- 239000012530 fluid Substances 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000005520 cutting process Methods 0.000 claims description 6
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 7
- 230000001105 regulatory effect Effects 0.000 abstract description 2
- 239000002253 acid Substances 0.000 description 13
- 230000020477 pH reduction Effects 0.000 description 7
- 238000005457 optimization Methods 0.000 description 3
- 230000000704 physical effect Effects 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 125000005587 carbonate group Chemical group 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000008398 formation water Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002332 oil field water Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000006467 substitution reaction 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
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
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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
- G01N15/0806—Details, e.g. sample holders, mounting samples for 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
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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Abstract
The invention discloses a device and a method for testing the shunting effect of a shunting agent for acid treatment, wherein the device comprises an injection system, a control system, a confining pressure system and a shunting test system; the test method comprises the following steps: s1, preparing experimental materials, assembling an experimental device and checking the sealing performance of the experimental device; s2, injecting base liquid, and testing the initial permeability of each core; s3, injecting a flow dividing agent; s4, injecting the base liquid again, and testing the permeability of each core after the experiment; s5, adopting different types of flow dividing agents and flow dividing agent dosage, and repeating the steps from S1 to S4. The invention can test the shunting effect of the shunting agent for acid treatment, and the device has simple and reliable structure; one holder can hold a plurality of rock cores, and the number of the rock cores is determined by the number of holes of the rubber barrel; the length of the core can be randomly regulated and controlled without limitation; the testing method and the steps are completely consistent with the site construction method, and the testing result can effectively represent the actual site construction result.
Description
Technical Field
The invention relates to the technical field of oil exploitation, in particular to a device and a method for testing the shunting effect of a shunting agent for acid treatment, belonging to the field of refining for increasing the yield of oil and gas fields.
Background
Acid treatment techniques have been widely used in sandstone and carbonate reservoirs. When the acid treatment is carried out on a vertical well for developing a huge thick reservoir stratum, a vertical well for multi-layer combined production and a horizontal well for a long horizontal section, the ideal transformation effect is that acid liquor does not enter a high-permeability zone or a small amount of acid liquor enters a high-permeability zone, and all or most of the acid liquor flows into a low-permeability zone, so that the uniform acid distribution of the whole well section is realized. However, in the actual acid treatment, most of the acid liquid flows into the high-permeability zone according to the principle of minimum flow resistance, the low-permeability zone is not effectively modified, and finally the modification effect of the acid treatment is not ideal. Therefore, a flow-splitting agent for acid treatment was developed, and the working principle thereof was: the shunting agent is injected independently or along with the shunting agent, most of the shunting agent enters the high-permeability zone according to the principle of minimum flow resistance, temporary plugging is realized on the high-permeability zone or the permeability of the high-permeability zone is temporarily reduced, so that the resistance of subsequent acid liquid flowing into the high-permeability zone is increased, and the subsequent acid liquid is forced to flow into the low-permeability zone, thereby achieving the ideal transformation effect. From the above, it can be seen that the shunting effect of the shunting agent determines whether the acid treatment is successfully modified, and it is important to optimize the type of the shunting agent and the amount of the shunting agent, so that a device and a method for testing the shunting effect of the shunting agent for acid treatment are urgently needed to be developed.
At present, there are reports of relevant documents, that is, an experimental device suitable for multi-permeability-level differential flow acidification disclosed in patent CN201320749264.8, and an experimental device suitable for multi-permeability-level differential flow acidification and an evaluation method disclosed in patent CN201310600726.4, wherein cores with different permeabilities are loaded into a plurality of core holders, the core holders are connected in parallel, and acid liquor or formation water is divided into the cores through a pipeline connected with a six-way valve. The dynamic fluid loss filter for the fracture acidizing working fluid disclosed by the patent CN202010236008.3 and the dynamic fluid loss filter for the fracture acidizing working fluid disclosed by the patent CN201020215621.9 are characterized in that a core holder holds a core, working fluid is injected into the core, and the fluid loss speed of the working fluid is tested. A sandstone reservoir self-steering shunting acidification method disclosed by patent CN201610513187.4, a temporary blocking steering acidification method suitable for sandstone reservoirs disclosed by patent CN201610808533.1, a high-permeability sandstone reservoir long well section steering shunting acidification method disclosed by patent CN201910701577.8, an optimization method of on-line shunting acidification construction parameters of an oil field water injection well reservoir disclosed by patent CN201910821931.0, and a high-permeability heterogeneous sandstone reservoir steering acidification method disclosed by patent CN202010191866.0, wherein action objects are oil and gas layers directly, and a shunting agent is injected along with or independently during acid treatment construction.
Although relevant documents are reported at present, the following problems generally exist. The first point is as follows: an indoor experimental device capable of testing the shunting effect of the shunting agent is not found; and a second point: an indoor test method capable of testing the shunting effect of the shunting agent is not found; and a third point: the existing device is characterized in that a plurality of rock core holders are connected in parallel, fluid is transferred in a six-way valve and then flows into each rock core through a pipeline, and the underground real condition is that each layer or each section is directly exposed in a shaft working fluid; a fourth point: the liquid amount flowing into each core in the existing device is not only influenced by the physical properties of the core, but also influenced by the length, the diameter and the like of a pipeline between the six-way valve and the core holder, and the underground real condition is only influenced by the physical properties of a reservoir; and fifth, the method comprises the following steps: one core holder can only hold one core; and a sixth point: the existing method has the advantages that the acting objects are directly oil and gas reservoirs, the effect of the diverting agent is evaluated by depending on the field construction effect of a production well, and the cost is high. Aiming at the problems, the invention provides a device and a method for testing the shunting effect of a shunting agent for acid treatment.
Disclosure of Invention
The invention aims to provide a device for testing the shunting effect of a shunting agent for acid treatment, and also aims to provide an indoor testing method for the shunting effect of the shunting agent for acid treatment, which finally solves the problems of optimization and dosage optimization of the shunting agent for acid treatment.
The invention provides a shunting agent shunting effect testing device for acid treatment, which comprises: injection system, control system, confined pressure system, reposition of redundant personnel test system. The injection system is communicated with the control system through a pipeline, the control system is communicated with the shunt test system through a pipeline, and the confining pressure system is communicated with the shunt test system through a pipeline.
The injection system comprises an injection pump A, an injection pump B, a clean water tank, a base liquid tank, a flow dividing agent liquid tank, a liquid tank cover and a liquid tank piston; the injection pump A and the injection pump B are constant flow pumps and are connected with the clean water tank through threads; the injection pump A is communicated with the base liquid tank through a pipeline, and the injection pump B is communicated with the flow dividing agent liquid tank through a pipeline; liquid tank pistons are arranged in the base liquid tank and the flow dividing agent liquid tank, the liquid tank pistons can move up and down in the liquid tank, and the top of the liquid tank is connected with a liquid tank cover through threads; after the clean water pumped by the injection pump enters the base liquid tank or the flow dividing agent liquid tank, the piston of the displacement liquid tank moves upwards, so that the base liquid or the flow dividing agent flows out of the liquid tank.
The control system comprises a four-way valve, a valve A, a valve B, a valve C, a valve D and a pressure gauge A. The valve and the four-way valve are connected and sealed through threads, and when the valve threads are more exposed, the larger the valve opening is indicated; when the valve is exposed without threads, the valve is closed.
The confining pressure system comprises a confining pressure tank, a confining pressure pump and a pressure gauge B. The confining pressure tank is generally filled with clear water or oil, the confining pressure tank is connected with the confining pressure pump through a pipeline, and a valve is arranged between the confining pressure tank and the confining pressure pump; and the reading of the pressure gauge B is the experiment confining pressure.
The shunting test system comprises a bolt, a fixing frame, an inlet plug, a constant-temperature heating sleeve, a clamp, a movable plug, an outlet plug, a measuring cylinder, a rubber cylinder and a rock core. The clamp holder is characterized in that a constant-temperature heating sleeve is arranged on a shell of the clamp holder, grooves are formed in two ends of the shell, and a groove and a notch are also formed in one end inside the clamp holder; the movable plug is inserted by aligning with the notch of the holder and then is rotationally clamped into the groove in the holder; a plurality of holes are formed in the rubber barrel, cores with different permeability rates are placed in the holes in the rubber barrel, and then the rubber barrel is placed in the holder; one end face of the inlet plug is provided with a plurality of circular grooves and longitudinal cutting grooves, and the end face is in seamless fit with the rubber barrel; the fixing frame A is clamped into a groove of the shell of the clamp holder, and then the bolt A is rotated to fix the inlet plug at one end of the clamp holder; the outlet plug penetrates through the movable plug and then is inserted into the rubber barrel to be in direct contact with one end face of the rock core, the insertion depth of the outlet plug is determined by the length of the rock core, and a plurality of circular grooves and longitudinal cutting grooves are formed in the end face of the outlet plug; the fixed frame B, the fixed frame C and the fixed frame D are all connected with the bolt D through threads, and one end of the bolt D is in contact with the movable plug; respectively clamping the fixing frame B, the fixing frame C and the fixing frame D into a shell groove of the clamp holder, and then respectively rotating the bolt B, the bolt E and the bolt C to fix the outlet plug A, the outlet plug C and the outlet plug B at one end of the clamp holder; the outlet plug is connected with a pipeline, and fluid in the pipeline flows into the measuring cylinder for metering.
Preferably, the number and the positions of the inner holes of the movable plugs are consistent with those of the rubber tube, and the number of the inner holes of the rubber tube is not less than two.
Preferably, the number of the fixing frames is one more than that of the inner holes of the rubber tube, and the lengths of the fixing frames are different.
The method for indoor testing by adopting the shunting agent shunting effect testing device for acid treatment comprises the following steps:
s1, preparing the test material, assembling the test device and checking the sealing property. The experimental material mainly comprises base liquid and a flow dividing agent, and if the flow dividing agent is injected concomitantly, acid liquor needs to be prepared; if the rock core is sandstone, the acid solution is standard earth acid; if the rock core is carbonate rock, the acid solution is hydrochloric acid; when the device is assembled, the movable plug is clamped into the holder, then the rubber tube with the rock core and the hole of the movable plug are aligned and placed into the holder, the inlet plug is inserted into the holder and fixed, the outlet plug is inserted into the movable plug in a penetrating mode, then the rubber tube is inserted and fixed, all pipelines are connected, and the tightness of the device is checked.
And S2, injecting base liquid, and testing the initial permeability of each core. Closing the valve B and the valve D, and opening the valve A and the valve C; filling the experiment confining pressure, wherein the reading of the pressure gauge B is the experiment confining pressure; starting an injection pump A, and driving the base fluid into each rock core; and after the liquid output of the pipeline at the position of the measuring cylinder is stable, recording the reading of the pressure gauge A and the liquid increment in each measuring cylinder in unit time, calculating the initial permeability of each core, and finishing the injection of the base liquid.
And S3, injecting a flow dividing agent. Closing the valve A and opening the valve D; when the diverting agent is injected independently, starting an injection pump B, driving the diverting agent into the rock core, and finishing the process of continuously injecting the diverting agent all the time; when the diverting agent is injected along with the injection, the diverting agent is added into the acid liquor to form mixed liquor, the mixed liquor is placed in the diverting agent liquid tank, the injection pump B is started, the mixed liquor is driven into the rock core, and the completion of the injection of the mixed liquor is finished.
And S4, injecting the base liquid again, and testing the permeability of each core after the experiment. Closing the valve D and opening the valve A; and (3) starting an injection pump A, injecting base liquid into each core, similarly, recording the reading of a pressure gauge A and the liquid increment in each measuring cylinder in unit time after the liquid output of the pipeline at the position of the measuring cylinder is stable, calculating the permeability of each core after the experiment, and ending the injection of the base liquid.
And S5, repeating S1 to S4 by adopting different types of flow dividing agents and flow dividing agent using amounts, and obtaining multiple groups of data processed by different types of flow dividing agents and different using amounts.
Compared with the prior art, the invention has the advantages that: (1) one holder can hold a plurality of rock cores, and the number of the rock cores is determined by the number of holes of the rubber barrel; (2) the length of the core can be randomly regulated and controlled without limitation; (3) the rock cores in the rubber barrel are all directly exposed in base fluid or a flow dividing agent, the underground practical situation is met, and the fluid amount flowing into each rock core is only influenced by the physical property of the rock core; (4) the device can test the shunting effect of the shunting agent and has simple and reliable structure; (5) the permeability of a plurality of rock cores can be tested simultaneously in one test; (6) the indoor testing method and the steps are completely consistent with the site construction method, and the testing result can effectively represent the site actual construction result.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is an exploded view of a portion of the shunt test system;
FIG. 3 is a cross-sectional view of a portion of the shunt test system;
fig. 4 is a cross-sectional view of the tank.
Reference numbers in the figures: 1-1, an injection pump A; 1-2, an injection pump B; 2. a clean water tank; 3. a base liquid tank; 4. a diverting agent liquid tank; 5. a pipeline; 6. a four-way valve; 7-1, a valve A; 7-2, a valve B; 7-3, valve C; 7-4, a valve D; 8-1, a pressure gauge A; 8-2, a pressure gauge B; 9-1, bolt A; 9-2, bolt B; 9-3, bolt C; 9-4, bolt D; 9-5, bolt E; 10-1, a fixing frame A; 10-2, a fixing frame B; 10-3, a fixing frame C; 10-4, a fixing frame D; 11. an inlet plug; 12. a constant temperature heating jacket; 13. a confining pressure tank; 14. a confining pressure pump; 15. a holder; 16. a movable plug; 17-1 and an outlet plug A; 17-2 and an outlet plug B; 17-3, and an outlet plug C; 18-1, measuring cylinder A; 18-2, measuring cylinder B; 18-3, measuring cylinder C; 19. a rubber tube; 20. a liquid tank cover; 21. a liquid reservoir piston; 22. and (4) a rock core.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
In the description of the present invention, it is to be understood that the terms "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and simplicity in description, but do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present invention.
As shown in fig. 1 to 4, a device and a method for testing the shunting effect of a shunting agent for acid treatment include: injection system, control system, confined pressure system, reposition of redundant personnel test system. The injection system is communicated with the control system through a pipeline 5, the control system is communicated with the shunt test system through a pipeline 5, and the confining pressure system is communicated with the shunt test system through a pipeline 5.
As shown in fig. 1 and 4, the injection system comprises an injection pump a1-1, an injection pump B1-2, a clean water tank 2, a base liquid tank 3, a diverting agent liquid tank 4, a liquid tank cover 20 and a liquid tank piston 21; the injection pump A1-1 and the injection pump B1-2 are constant flow pumps and are connected with the clean water tank 2 through threads; the injection pump A1-1 is communicated with the base liquid tank 3 through a pipeline 5, and the injection pump B1-2 is communicated with the flow dividing agent liquid tank 4 through a pipeline 5; a liquid tank piston 21 is arranged in the base liquid tank 3 or the flow dividing agent liquid tank 4, the liquid tank piston 21 can move up and down in the liquid tank, and the top of the liquid tank is connected with a liquid tank cover 20 through threads; after the clean water pumped by the injection pump enters the base liquid tank 3 or the diverting agent liquid tank 4, the displacement liquid tank piston 21 moves upwards, so that the base liquid or the diverting agent flows out of the liquid tank.
The control system comprises a four-way valve 6, a valve A7-1, a valve B7-2, a valve C7-3, a valve D7-4 and a pressure gauge A8-1. The valve and the four-way valve 6 are connected and sealed through threads, and when the valve threads are more exposed, the larger the valve opening is shown; when the valve is exposed without threads, the valve is closed. By closing valve B7-2 and valve D7-4 and opening valve A7-1 and valve C7-3, the base liquid tank 3 is connected to the split test system.
The confining pressure system comprises a confining pressure tank 13, a confining pressure pump 14 and a pressure gauge B8-2. The confining pressure tank 13 is generally filled with clear water or oil, the confining pressure tank 13 is connected with the confining pressure pump 14 through a pipeline, and a valve is arranged between the confining pressure tank 13 and the confining pressure pump; and the reading of the pressure gauge B8-2 is the experimental confining pressure.
As shown in fig. 1-3, the shunt test system includes a bolt, a fixing frame, an inlet plug 11, a constant temperature heating jacket 12, a holder 15, a movable plug 16, an outlet plug, a measuring cylinder, a rubber cylinder 19, and a core 22. The shell of the holder 15 is provided with a constant temperature heating sleeve 12, grooves are formed in the two ends of the shell, and a groove and a notch are also formed in one end inside the holder 15; the movable plug 16 is aligned with the gap of the holder 15 and inserted, and then is rotationally clamped into the groove in the holder 15; three holes are formed in the rubber tube 19, the rock cores 22 with different permeability rates are placed in the holes in the rubber tube 19, and then the rubber tube 19 is placed in the holder 15; the number and the position of the inner holes of the movable plug are consistent with those of the rubber tube, one end face of the inlet plug 11 is provided with a plurality of circular grooves and longitudinal cutting grooves, and the end face is in seamless fit with the rubber tube 19; the fixing frame A10-1 is clamped into a groove of the shell of the holder 15, and then the bolt A9-1 is rotated to fix the inlet plug 11 at one end of the holder 15; the outlet plug penetrates through the movable plug 16 and then is inserted into the rubber barrel 19 to be in direct contact with one end face of the rock core 22, the insertion depth of the outlet plug is determined by the length of the rock core 22, and a plurality of circular grooves and longitudinal cutting grooves are formed in the end face of the outlet plug; the fixed frame B10-2, the fixed frame C10-3 and the fixed frame D10-4 are all connected with the bolt D9-4 through threads, and one end of the bolt D9-4 is in contact with the movable plug 16; respectively clamping a fixed frame B10-2, a fixed frame C10-3 and a fixed frame D10-4 into a shell groove of the clamp 15, and then respectively rotating a bolt B9-2, a bolt E9-5 and a bolt C9-3 to fix an outlet plug A17-1, an outlet plug C17-3 and an outlet plug B17-2 at one end of the clamp 15; the outlet plug A17-1, the outlet plug B17-2 and the outlet plug C17-3 are respectively connected with a pipeline, and fluid in the pipeline respectively flows into the measuring cylinder A18-1, the measuring cylinder B18-2 and the measuring cylinder C18-3 for metering.
The method for performing indoor test by adopting the shunting agent shunting effect testing device for acid treatment comprises the following steps:
s1, preparing the test material, assembling the test device and checking the sealing property. The experimental material mainly comprises base liquid and a flow dividing agent; when the device is assembled, the movable plug 16 is firstly clamped into the holder 15, then the rubber tube 19 with the core 22 and the hole of the movable plug 16 are aligned and placed into the holder 15, then the inlet plug 11 is inserted into the holder 15 and fixed, finally the outlet plug is inserted into the movable plug 16 in a penetrating manner, then the rubber tube 19 is inserted and fixed, and all pipelines are connected and the tightness of the device is checked.
And S2, injecting base liquid, and testing the initial permeability of each core. Closing the valve B7-2 and the valve D7-4, and opening the valve A7-1 and the valve C7-3; the experimental confining pressure is added, and the reading of a pressure gauge B8-2 is the experimental confining pressure; starting an injection pump A1-1, and driving the base fluid into each core; and when the liquid output of the pipeline at the position of the measuring cylinder is stable, the reading of a pressure gauge A8-1 and the liquid increment in each measuring cylinder in unit time are recorded, so that the initial permeability of each core can be calculated, and the injection of the base liquid is finished.
And S3, injecting a flow dividing agent. Closing the valve A7-1 and opening the valve D7-4; and starting an injection pump B1-2, driving the diverting agent into the core, and finishing the process of continuously injecting the diverting agent.
And S4, injecting the base liquid again, and testing the permeability of each core after the experiment. Closing the valve D7-4 and opening the valve A7-1; and (3) starting an injection pump A1-1, injecting base liquid into each core 22, similarly, recording the reading of a pressure gauge A8-1 and the liquid increment in each measuring cylinder in unit time after the liquid output of the pipeline at the position of the measuring cylinder is stable, calculating the permeability of each core after the experiment, and finishing the injection of the base liquid.
And S5, repeating S1 to S4 by adopting different types of flow dividing agents and different flow dividing agent dosages, and obtaining multiple groups of experimental data after different types of flow dividing agents and different dosages are processed.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (3)
1. A shunting agent shunting effect testing device and a testing method for acid treatment are characterized in that: the device comprises an injection system, a control system, a confining pressure system and a shunt test system; the injection system comprises an injection pump A, an injection pump B, a clean water tank, a base liquid tank, a flow dividing agent liquid tank, a liquid tank cover and a liquid tank piston; the injection pump is connected with the clean water tank through threads; the injection pump A is communicated with the base liquid tank through a pipeline, and the injection pump B is communicated with the flow dividing agent liquid tank through a pipeline; liquid tank pistons are arranged in the base liquid tank and the flow dividing agent liquid tank, the liquid tank pistons can move up and down in the liquid tank, and the liquid tank is connected with a liquid tank cover through threads; the control system comprises a four-way valve, a valve and a pressure gauge A, wherein the valve and the four-way valve are connected and sealed through threads; the confining pressure system comprises a confining pressure tank, a confining pressure pump and a pressure gauge, wherein the confining pressure tank is connected with the confining pressure pump through a pipeline, and a valve is arranged between the confining pressure tank and the confining pressure pump; the shunting test system comprises a bolt, a fixing frame, an inlet plug, a constant-temperature heating sleeve, a clamp, a movable plug, an outlet plug, a measuring cylinder, a rubber cylinder and a rock core; the clamp holder is characterized in that a constant-temperature heating sleeve is arranged on a shell of the clamp holder, grooves are formed in two ends of the shell, and a groove and a notch are also formed in one end inside the clamp holder; the movable plug is inserted by aligning with the notch of the holder and then is rotationally clamped into the groove in the holder; a plurality of holes are formed in the rubber barrel, cores with different permeability rates are placed in the holes in the rubber barrel, and then the rubber barrel is placed in the holder; one end face of the inlet plug is provided with a plurality of circular grooves and longitudinal cutting grooves, and the end face is in seamless fit with the rubber barrel; the fixing frame A is clamped into a groove of the shell of the clamp holder, and then the bolt A is rotated to fix the inlet plug at one end of the clamp holder; the outlet plug penetrates through the movable plug and then is inserted into the rubber barrel to be in direct contact with one end face of the rock core, the insertion depth of the outlet plug is determined by the length of the rock core, and a plurality of circular grooves and longitudinal cutting grooves are formed in the end face of the outlet plug; the fixed frame B, the fixed frame C and the fixed frame D are all connected with the bolt D through threads, and one end of the bolt D is in contact with the movable plug; the fixing frame is clamped into a groove of a shell of the clamp holder, and then the bolt is rotated to fix the outlet plug at one end of the clamp holder; the outlet plug is connected with a pipeline, and fluid in the pipeline flows into the measuring cylinder for metering; the test method comprises the following steps: s1, preparing experimental materials, assembling an experimental device and checking the sealing performance of the experimental device; s2, injecting base liquid, and testing the initial permeability of each core; s3, injecting a flow dividing agent; s4, injecting the base liquid again, and testing the permeability of each core after the experiment; s5, adopting different types of flow dividing agents and flow dividing agent dosage, and repeating the steps from S1 to S4.
2. The device and the method for testing the shunting effect of the shunting agent for acid treatment according to claim 1, wherein: the number and the position of the inner holes of the movable plug are consistent with those of the rubber tube, and the number of the inner holes of the rubber tube is not less than two.
3. The device and the method for testing the shunting effect of the shunting agent for acid treatment according to claim 1, wherein: the number of the fixing frames is one more than that of the inner holes of the rubber tube, and the lengths of the fixing frames are different.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010911884.1A CN111879903A (en) | 2020-09-02 | 2020-09-02 | Shunting agent shunting effect testing device and method for acid treatment |
Applications Claiming Priority (1)
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| CN114965226A (en) * | 2022-08-01 | 2022-08-30 | 成都理工大学 | Device and method for measuring acidizing and plug removal performance of rock core |
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| CN114965226A (en) * | 2022-08-01 | 2022-08-30 | 成都理工大学 | Device and method for measuring acidizing and plug removal performance of rock core |
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