CN111734344A - Experimental device and method for evaluating performance of plugging agent for plugging oil layer - Google Patents
Experimental device and method for evaluating performance of plugging agent for plugging oil layer Download PDFInfo
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- CN111734344A CN111734344A CN202010606807.5A CN202010606807A CN111734344A CN 111734344 A CN111734344 A CN 111734344A CN 202010606807 A CN202010606807 A CN 202010606807A CN 111734344 A CN111734344 A CN 111734344A
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000011435 rock Substances 0.000 claims abstract description 66
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 57
- 238000005070 sampling Methods 0.000 claims abstract description 57
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 53
- 238000006073 displacement reaction Methods 0.000 claims abstract description 31
- 238000002347 injection Methods 0.000 claims description 29
- 239000007924 injection Substances 0.000 claims description 29
- 239000003921 oil Substances 0.000 claims description 26
- 239000010779 crude oil Substances 0.000 claims description 8
- 239000004576 sand Substances 0.000 claims description 8
- 229920003051 synthetic elastomer Polymers 0.000 claims description 7
- 230000003247 decreasing effect Effects 0.000 claims description 5
- 230000033764 rhythmic process Effects 0.000 claims description 5
- 238000011156 evaluation Methods 0.000 claims description 2
- 238000000605 extraction Methods 0.000 abstract description 2
- 238000004088 simulation Methods 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
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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
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/261—Separate steps of (1) cementing, plugging or consolidating and (2) fracturing or attacking the formation
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention belongs to the field of oil extraction engineering, and particularly relates to an experimental device and method for evaluating the performance of a plugging agent for plugging an oil layer. The invention mainly solves the problem that the existing experimental device can not truly simulate the pressure plugging process in the stratum. The invention comprises an output valve (1), an output plug (2), a rock core (3), a primary shunt sampling valve (4), a secondary shunt sampling valve (5), a tertiary shunt sampling valve (6) and other components. According to the invention, a constant-current displacement pump (15) is used for pressurizing, a plugging agent in an intermediate container (13) is injected into a treated water-driven core sample from an artificial core crack (8), after the plugging agent is gelatinized, the core is subjected to water driving again, the change condition of the water content of an output plug (2) is measured, and the plugging performance of a plugging agent is evaluated. The invention has the advantages of simplicity, practicality, scientific and reasonable simulation of the performance of the plugging agent for plugging the oil layer, and the like.
Description
Technical Field
The invention belongs to the field of oil extraction engineering, and particularly relates to an experimental device and method for evaluating the performance of a plugging agent for plugging an oil layer.
Background
The pressure plugging is to inject a plugging agent into a high-water-content stratum in a fracturing mode, the plugging agent preferentially flows through a dominant seepage channel, the dominant channel is plugged by the plugging agent after the gel is formed, and then residual oil in a low-permeability stratum at the upper part of the stratum is driven out.
The existing test for evaluating the performance of the pressure plugging agent is limited to simply injecting the plugging agent into a core sample, testing the plugging performance of the plugging agent after the plugging agent is gelatinized, and cannot truly simulate the pressure plugging process in the stratum and reasonably evaluate the performance of the pressure plugging agent for plugging an oil layer. Therefore, a set of corresponding experimental device and evaluation method is needed to scientifically and reasonably simulate the performance of the plugging agent for plugging the oil reservoir.
Disclosure of Invention
The invention provides an experimental device and method for evaluating the performance of a plugging agent for plugging an oil layer, which can truly simulate the process of a plugging process in a stratum and reasonably evaluate the performance of the plugging agent for plugging the oil layer.
The technical scheme of the invention is as follows: an experimental device for evaluating the performance of a plugging agent for plugging an oil layer comprises an output valve, an output plug, a core, a first-stage shunt sampling valve, a second-stage shunt sampling valve, a third-stage shunt sampling valve, an artificial rubber cylinder, an injection plug, a pipeline, an injection valve, an intermediate container, a displacement valve, a constant-current displacement pump, a core module, a supporting pad, a fourth-stage shunt sampling valve, a fifth-stage shunt sampling valve, a sixth-stage shunt sampling valve, a confining pressure valve and a confining pressure pump; the constant-flow displacement pump is sequentially connected with a displacement valve, an intermediate container and an injection valve, and is sequentially connected with an injection plug and a rock core through pipelines, and the other side of the rock core is connected with an output plug and an output valve; the core module is internally provided with an artificial rubber cylinder and a supporting pad and is connected with a confining pressure valve and a confining pressure pump, and the core module is externally connected with a first-stage shunt sampling valve, a second-stage shunt sampling valve, a third-stage shunt sampling valve, a fourth-stage shunt sampling valve, a fifth-stage shunt sampling valve and a sixth-stage shunt sampling valve.
And an artificial core crack with a certain length is formed on one side of the injection plug of the core sample, and fine sand is backfilled in the crack.
A method for evaluating the performance of a plugging agent for plugging an oil layer by utilizing an experimental device for evaluating the performance of the plugging agent for plugging the oil layer comprises the following steps:
a, selecting a rock core with positive rhythm, and carrying out oil saturation treatment on the rock core;
b, adding water into the intermediate container, opening the confining pressure pump to pressurize the core module, and performing water drive treatment on the core by using a constant-flow displacement pump until the water content of the output plug is 98%;
c, taking out the core, cutting an artificial core crack with a certain length on one side of the core injection plug, and backfilling fine sand in the crack to prevent the core from being damaged when the confining pressure pump pressurizes;
d: the processed rock core sample is put back to the device, water in the intermediate container is replaced by a plugging agent, the confining pressure pump is opened to pressurize the rock core module, and the plugging agent in the intermediate container is injected into the rock core sample from an artificial rock core crack by using the constant-current displacement pump;
e: and after the plugging agent is gelatinized, performing water drive on the rock core again, and measuring the water content of one side of the output plug and the change condition of the crude oil.
f: when the water is driven again, if the water content is slowly increased from low to 100 percent, the water content is gradually decreased from high to low and is stably close to 0, and the plugging performance of the plugging agent is better; on the contrary, if the water content is rapidly increased, the content of the crude oil is rapidly reduced, which indicates that the plugging performance of the plugging agent is not ideal.
The invention has the beneficial effects that: the experimental device and the method for evaluating the performance of the plugging agent for plugging the oil layer are simple and practical, can truly simulate the process of plugging process in the stratum, and can reasonably evaluate the performance of the plugging agent for plugging the oil layer.
Description of the drawings fig. 1 is a schematic diagram of a structure of the present invention.
In the figure: 1 output valve, 2 output plugs, 3 rock cores, 4 one-level shunt sampling valves, 5 two-level shunt sampling valves, 6 three-level shunt sampling valves, 9 artificial rubber cylinders, 10 injection plugs, 11 pipelines, 12 injection valves, 13 intermediate containers, 14 displacement valves, 15 constant-current displacement pumps, 16 rock core modules, 17 supporting pads, 18 four-level shunt sampling valves, 19 five-level shunt sampling valves, 20 six-level shunt sampling valves, 21 confining pressure valves and 22 confining pressure pumps.
Detailed description of the preferred embodimentsthe present invention will be described in further detail below with reference to the accompanying drawings and specific examples. An experimental device for evaluating the performance of a plugging agent for plugging an oil layer comprises an output valve 1, an output plug 2, a rock core 3, a first-stage shunt sampling valve 4, a second-stage shunt sampling valve 5, a third-stage shunt sampling valve 6, an artificial rubber cylinder 9, an injection plug 10, a pipeline 11, an injection valve 12, an intermediate container 13, a displacement valve 14, a constant-flow displacement pump 15, a rock core module 16, a supporting pad 17, a fourth-stage shunt sampling valve 18, a fifth-stage shunt sampling valve 19, a sixth-stage shunt sampling valve 20, a confining pressure valve 21 and a confining pressure pump 22; the constant-flow displacement pump 15 is sequentially connected with a displacement valve 14, an intermediate container 13 and an injection valve 12, and is input into the core 3 through a pipeline 11 from an injection plug 10 through an artificial core crack 8, and the other side of the core 3 is connected with an output plug 2 and an output valve 1; the core module 16 is internally provided with an artificial rubber sleeve 9 and a supporting pad 17, is connected with a confining pressure valve 21 and a confining pressure pump 22, and is externally connected with a first-stage shunt sampling valve 4, a second-stage shunt sampling valve 5, a third-stage shunt sampling valve 6, a fourth-stage shunt sampling valve 18, a fifth-stage shunt sampling valve 19 and a sixth-stage shunt sampling valve 20.
An artificial core crack 8 with a certain length is arranged on one side of an injection plug 10 of the core 3, and fine sand 7 is backfilled in the crack.
A method for evaluating the performance of a plugging agent for plugging an oil layer by utilizing an experimental device for evaluating the performance of the plugging agent for plugging the oil layer comprises the following steps:
a, selecting a rock core 3 with positive rhythm, and carrying out oil saturation treatment on the rock core 3;
b, adding water into the intermediate container 13, opening the confining pressure pump 22 to pressurize the rock core module 16, and performing water drive treatment on the rock core 3 by using the constant-flow displacement pump 15 until the water content of the output plug 2 is 98%;
c, taking out the rock core 3, cutting an artificial rock core crack 8 with a certain length on one side of the injection plug 10 of the rock core 3, and backfilling fine sand 7 in the crack to prevent the rock core 3 from being damaged when the confining pressure pump 22 pressurizes;
d: the processed rock core 3 sample is put back to the device, the water in the middle container 13 is changed into the plugging agent, the confining pressure pump 22 is opened to pressurize the rock core module 16, and the plugging agent in the middle container 13 is injected into the rock core 3 sample from the artificial rock core crack 8 by using the constant-current displacement pump 15;
e: and after the plugging agent is gelatinized, performing water drive on the rock core 3 again, and measuring the water content of one side 2 of the output plug and the change condition of the crude oil.
f: when the water is driven again, if the water content is slowly increased from low to 100 percent, the water content is gradually decreased from high to low and is stably close to 0, and the plugging performance of the plugging agent is better; on the contrary, if the water content is rapidly increased, the content of the crude oil is rapidly reduced, which indicates that the plugging performance of the plugging agent is not ideal.
Example 1: the device is used for evaluating the performance of the plugging agent for plugging the oil layer, and the specific using steps are as follows:
a, selecting a rock core 3 with positive rhythm, and carrying out oil saturation treatment on the rock core 3;
b, opening an output valve 1, an injection valve 12, a displacement valve 14 and a confining pressure valve 21, closing the rest valves, adding water into an intermediate container 13, opening a confining pressure pump 22 to pressurize a rock core module 16, and performing water drive treatment on a rock core 3 by using a constant-flow displacement pump 15 until the water content of an output plug 2 is 98%;
c, taking out the rock core 3, cutting an artificial rock core crack 8 with a certain length on one side of the injection plug 10 of the rock core 3, and backfilling fine sand 7 in the crack to prevent the rock core 3 from being damaged when the confining pressure pump 22 pressurizes;
d: putting the processed rock core 3 sample back to the device, opening the output valve 1, the injection valve 12, the displacement valve 14 and the confining pressure valve 21, closing the other valves, replacing the water in the intermediate container 13 with a plugging agent, opening the confining pressure pump 22 to pressurize the rock core module 16, and injecting the plugging agent in the intermediate container 13 into the rock core 3 sample from the artificial rock core crack 8 by using the constant-current displacement pump 15;
e: and after the plugging agent is gelatinized, opening the output valve 1, the injection valve 12, the displacement valve 14 and the confining pressure valve 21, closing the other valves, performing water drive on the rock core 3 again, and measuring the change condition of the water content on one side of the output plug 2.
f: when the water is driven again, if the water content is slowly increased from low to 100 percent, the water content is gradually decreased from high to low and is stably close to 0, and the plugging performance of the plugging agent is better; on the contrary, if the water content is rapidly increased, the content of the crude oil is rapidly reduced, which indicates that the plugging performance of the plugging agent is not ideal.
Example 2: the device is used for evaluating the performance of the plugging agent for plugging the oil layer, and the specific using steps are as follows:
a, selecting a rock core 3 with positive rhythm, cutting an artificial rock core crack 8 with a certain length on one side of an injection plug 10 of the rock core 3, and backfilling fine sand 7 in the crack to prevent the rock core 3 from being damaged when a confining pressure pump 22 pressurizes;
b, opening an output valve 1, an injection valve 12, a displacement valve 14 and a confining pressure valve 21, closing the rest valves, putting the processed rock core 3 sample back to the device, adding water into an intermediate container 13, opening a confining pressure pump 22 to pressurize a rock core module 16, and performing water drive treatment on the rock core 3 by using a constant flow displacement pump 15 until the water content of an output plug 2 is 98%;
c, opening an output valve 1, an injection valve 12, a displacement valve 14 and a confining pressure valve 21, closing the other valves, replacing water in the middle container 13 with a plugging agent, opening a confining pressure pump 22 to pressurize a rock core module 16, and injecting the plugging agent in the middle container 13 into a rock core 3 sample from an artificial rock core crack 8 by using a constant-current displacement pump 15;
d: after the plugging agent is gelatinized, opening a first-stage shunt sampling valve 4, a second-stage shunt sampling valve 5, a third-stage shunt sampling valve 6, a fourth-stage shunt sampling valve 18, a fifth-stage shunt sampling valve 19 and a sixth-stage shunt sampling valve 20, opening an injection valve 12, a displacement valve 14 and a confining pressure valve 21, and closing the rest valves;
e: and performing water drive on the rock core 3 again, and measuring the water yield conditions of the first-stage shunt sampling valve 4, the second-stage shunt sampling valve 5, the third-stage shunt sampling valve 6, the fourth-stage shunt sampling valve 18, the fifth-stage shunt sampling valve 19 and the sixth-stage shunt sampling valve 20.
f: when the water is driven again, if the water content is slowly increased from low to 100 percent, the water content is gradually decreased from high to low and is stably close to 0, and the plugging performance of the plugging agent is better; on the contrary, if the water content is rapidly increased, the content of the crude oil is rapidly reduced, which indicates that the plugging performance of the plugging agent is not ideal.
Claims (3)
1. The utility model provides an experimental apparatus of oil reservoir shutoff is with stifled agent performance evaluation which characterized in that: the core injection device comprises an output valve (1), an output plug (2), a core (3), a first-stage shunt sampling valve (4), a second-stage shunt sampling valve (5), a third-stage shunt sampling valve (6), an artificial rubber cylinder (9), an injection plug (10), a pipeline (11), an injection valve (12), a middle container (13), a displacement valve (14), a constant-flow displacement pump (15), a core module (16), a supporting pad (17), a fourth-stage shunt sampling valve (18), a fifth-stage shunt sampling valve (19), a sixth-stage shunt sampling valve (20), a confining pressure valve (21) and a confining pressure pump (22); the constant-flow displacement pump (15) is sequentially connected with a displacement valve (14), an intermediate container (13) and an injection valve (12), an injection plug (10) and a rock core (3) are sequentially connected through a pipeline (11), and the other side of the rock core (3) is connected with an output plug (2) and an output valve (1); the core module (16) is internally provided with an artificial rubber sleeve (9) and a supporting pad (17), the core module (16) is sequentially connected with a confining pressure valve (21) and a confining pressure pump (22), and the core module (16) is externally connected with a first-stage shunt sampling valve (4), a second-stage shunt sampling valve (5), a third-stage shunt sampling valve (6), a fourth-stage shunt sampling valve (18), a fifth-stage shunt sampling valve (19) and a sixth-stage shunt sampling valve (20).
2. The experimental device for evaluating the performance of the plugging agent for plugging an oil layer according to claim 1, is characterized in that: an artificial core crack (8) with a certain length is arranged on one side of an injection plug (10) of a core (3) sample, and fine sand (7) is backfilled in the crack.
3. The method for evaluating the performance of the plugging agent for plugging the oil layer by utilizing the experimental device for evaluating the performance of the plugging agent for plugging the oil layer is characterized by comprising the following steps of: it comprises the following steps:
a, selecting a rock core (3) with positive rhythm, and carrying out oil saturation treatment on the rock core (3);
b, adding water into the intermediate container (13), opening the confining pressure pump (22) to pressurize the rock core module (16), and performing water drive treatment on the rock core (3) by using the constant-current displacement pump (15) until the water content of the output plug (2) is 98%;
c, taking out the rock core (3), cutting an artificial rock core crack (8) with a certain length on one side of the rock core injection plug (10), and backfilling fine sand (7) into the crack to prevent the rock core (3) from being damaged when the confining pressure pump (22) pressurizes;
d: the processed rock core (3) sample is put back to the device, water in the middle container (13) is changed into a plugging agent, a confining pressure pump (22) is opened to pressurize a rock core module (16), and the plugging agent in the middle container (13) is injected into the rock core (3) sample from an artificial rock core crack (8) by a constant-current displacement pump (15);
e: and after the plugging agent is gelatinized, performing water drive on the rock core (3) again, and measuring the water content on one side of the output plug (2) and the change condition of crude oil.
f: when the water is driven again, if the water content is slowly increased from low to 100 percent, the water content is gradually decreased from high to low and is stably close to 0, and the plugging performance of the plugging agent is better; on the contrary, if the water content is rapidly increased, the content of the crude oil is rapidly reduced, which indicates that the plugging performance of the plugging agent is not ideal.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113008686A (en) * | 2021-03-02 | 2021-06-22 | 中国石油大学(北京) | Hard and brittle shale crack opening simulation device |
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| CN202975005U (en) * | 2012-11-16 | 2013-06-05 | 中国石油化工股份有限公司 | Rock core holder |
| CN106950113A (en) * | 2017-03-29 | 2017-07-14 | 中国石油大学(华东) | A kind of device and its application for horizontal well explosion fracturing simulated experiment |
| KR101814020B1 (en) * | 2017-08-31 | 2018-01-02 | 한국건설기술연구원 | Current Hydraulic Fracturing System for Applying Differential Stress |
| CN109709021A (en) * | 2019-02-26 | 2019-05-03 | 中国石油大学(华东) | Evaluation blocking agent blocks in perforation crack and the experimental provision and method of plugging removal effect |
| CN110924907A (en) * | 2019-12-31 | 2020-03-27 | 西安石油大学 | Multi-section pressure measurement water-air alternative oil extraction experimental device and method for CT scanning |
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- 2020-06-29 CN CN202010606807.5A patent/CN111734344A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN202975005U (en) * | 2012-11-16 | 2013-06-05 | 中国石油化工股份有限公司 | Rock core holder |
| CN106950113A (en) * | 2017-03-29 | 2017-07-14 | 中国石油大学(华东) | A kind of device and its application for horizontal well explosion fracturing simulated experiment |
| KR101814020B1 (en) * | 2017-08-31 | 2018-01-02 | 한국건설기술연구원 | Current Hydraulic Fracturing System for Applying Differential Stress |
| CN109709021A (en) * | 2019-02-26 | 2019-05-03 | 中国石油大学(华东) | Evaluation blocking agent blocks in perforation crack and the experimental provision and method of plugging removal effect |
| CN110924907A (en) * | 2019-12-31 | 2020-03-27 | 西安石油大学 | Multi-section pressure measurement water-air alternative oil extraction experimental device and method for CT scanning |
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| CN113008686A (en) * | 2021-03-02 | 2021-06-22 | 中国石油大学(北京) | Hard and brittle shale crack opening simulation device |
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Application publication date: 20201002 |