CN111155990A - Experimental device for evaluating influence of interlayer and injection-production point on recovery ratio of thick-layer oil reservoir - Google Patents
Experimental device for evaluating influence of interlayer and injection-production point on recovery ratio of thick-layer oil reservoir Download PDFInfo
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- CN111155990A CN111155990A CN202010087528.2A CN202010087528A CN111155990A CN 111155990 A CN111155990 A CN 111155990A CN 202010087528 A CN202010087528 A CN 202010087528A CN 111155990 A CN111155990 A CN 111155990A
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- 239000011229 interlayer Substances 0.000 title claims abstract description 25
- 238000011084 recovery Methods 0.000 title claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- 239000010410 layer Substances 0.000 title claims abstract description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000004576 sand Substances 0.000 claims abstract description 30
- 238000002347 injection Methods 0.000 claims abstract description 15
- 239000007924 injection Substances 0.000 claims abstract description 15
- 238000006073 displacement reaction Methods 0.000 claims abstract description 13
- 239000006004 Quartz sand Substances 0.000 claims abstract description 8
- 239000012530 fluid Substances 0.000 claims description 7
- 239000012535 impurity Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 238000004088 simulation Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 244000035744 Hura crepitans Species 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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Classifications
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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
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B25/00—Models for purposes not provided for in G09B23/00, e.g. full-sized devices for demonstration purposes
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- Engineering & Computer Science (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics (AREA)
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Abstract
The invention discloses an experimental device for evaluating the influence of an interlayer and an injection-production point on the recovery ratio of a thick-layer oil reservoir, which comprises an injection part, a sand filling model part and a displacement product metering part which are sequentially connected, wherein the sand filling model part comprises a sand filling box and a tiltable support frame, quartz sand is filled in the sand filling box, and a low-permeability block is buried in the quartz sand and used for simulating the interlayer; at least 3 simulated mineshafts are inserted into the sand-packed box, wherein the bottom of one simulated mineshaft is positioned above the low-permeability block, the bottom of the other two simulated mineshafts is positioned below the low-permeability block, and at least one simulated mineshaft penetrates through the low-permeability block; the sand filling box is positioned on the inclinable support frame, so that the inclination angle of the sand filling box can be adjusted, and the influence of interlayers with different inclination angles on the recovery ratio can be simulated.
Description
Technical Field
The invention relates to the technical field of oilfield experimental equipment, in particular to an experimental device for evaluating the influence of an interlayer and an injection-production point on the recovery ratio of a thick-layer oil reservoir.
Background
The interlayer is a relatively low-permeability or non-permeability part formed due to geological action in an oil-gas layer, the thickness of the interlayer is generally a few centimeters when the interlayer is small, and can reach tens of meters when the interlayer is large, the seepage speed and the seepage effect of fluid in a flow unit are greatly influenced, and the existing literature shows that the interlayer can reduce water invasion and prolong the period of anhydrous oil recovery. Meanwhile, the interlayer position, the interlayer and injection and production point positions and the position distribution among the injection and production points all have important influence on the oil recovery ratio of an oil reservoir, an indoor physical simulation method is an important means for researching the water displacement rule of a non-homogeneous thick oil reservoir in the reservoir, but most of the existing conclusions are obtained under the condition of numerical simulation, and physical simulation devices for simulating the influence of the interlayer and the injection and production points on the oil recovery ratio of the oil reservoir are few at present.
Disclosure of Invention
In order to solve the problems, the invention provides an experimental device for evaluating the influence of an interlayer and an injection-production point on the recovery ratio of a thick-layer oil reservoir.
In order to achieve the purpose, the invention provides the following technical scheme:
an experimental device for evaluating the influence of an interlayer and an injection-production point on the recovery ratio of a thick-layer oil reservoir comprises an injection part, a sand-packed model part and a displacement product metering part which are sequentially connected.
The injection part comprises a displacement pump, a flowmeter and a pressure gauge which are connected in sequence.
The displacement product metering part comprises a pressure gauge, a back pressure control valve, a cooler and a measuring cylinder which are connected in sequence.
The sand filling model part comprises a sand filling box and a tiltable support frame, wherein quartz sand is filled in the sand filling box, and a low-permeability block is embedded in the quartz sand and used for simulating an interlayer; at least 3 simulated mineshafts are inserted into the sand-packed box, wherein the bottom of one simulated mineshaft is positioned above the low-permeability block, the bottoms of the other two simulated mineshafts are positioned below the low-permeability block, and at least one simulated mineshaft penetrates through the low-permeability block, so that the simulated mineshafts can be optionally used as an injection well and a production well to be respectively connected with a flowmeter and a back-pressure valve during experiments; the sand filling box is positioned on the inclinable support frame, so that the inclination angle of the sand filling box can be adjusted, and the influence of interlayers with different inclination angles on the recovery ratio can be simulated.
Further, the low-permeability block is made of stainless steel materials.
Furthermore, the part of the simulation shaft in the sand filling box is provided with small holes for fluid to pass through, and the outer wall of the simulation shaft is provided with a plurality of layers of dense silk screens for intercepting impurities in the fluid to prevent blockage.
Furthermore, the inclinable support frame comprises a top plate and a bottom plate which are respectively connected with the tops and the bottoms of the three jacks, wherein the jacks are connected with the top plate in a hinged mode.
Furthermore, the sand filling box is positioned in the oil bath box, and the temperature of the sand filling model can reach more than 200 ℃ under normal pressure by adopting the oil bath, so that the high temperature of the stratum is simulated.
The invention has the following beneficial effects:
the invention is provided with at least three simulated mineshafts, wherein the bottom of one simulated mineshaft is positioned above the low-permeability block, the bottom of the other two simulated mineshafts is positioned below the low-permeability block, and at least one simulated mineshaft penetrates through the low-permeability block, and the simulated mineshafts can be optionally used as an injection well and a production well to be respectively connected with a flow meter and a back pressure valve during experiments, so that the influence of different displacement positions on the recovery ratio can be simulated; the sand filling box is positioned on the inclinable support frame, and the inclinable support frame can change the inclination angle of the top plate of the inclinable support frame, so that the inclination angle of the low-permeability block is adjusted, and the influence of interlayers with different inclination angles on the recovery ratio is simulated.
Drawings
FIG. 1 is a schematic view of the present invention;
FIG. 2 is a schematic view of a tiltable support stand;
in the figure, 11, the displacement pump; 12. a flow meter; 13. a pressure gauge; 21. filling a sand box; 22. a tiltable support frame;
23. an oil bath tank; (ii) a 31. A control valve; 32. a cooler; 33. a measuring cylinder;
211. a hypotonic block; 212. simulating a shaft; 222. a top plate; 223. a base plate; 231. a hot oil circulating pump; 232. A heater.
Detailed Description
The technical solutions of the present invention will be described in detail below in order to clearly understand the technical features, objects, and advantages of the present invention, but the present invention is not limited to the practical scope of the present invention.
An experimental device for evaluating the influence of an interlayer and an injection-production point on the recovery ratio of a thick-layer oil reservoir comprises an injection part, a sand-packed model part and a displacement product metering part which are sequentially connected.
The injection part comprises a displacement pump 11, a flowmeter 12 and a pressure gauge 13 which are connected in sequence.
The displacement product metering part comprises a back pressure control valve 31, a cooler 32 and a measuring cylinder 33 which are connected in sequence, wherein a pressure gauge 13 is arranged in front of the back pressure valve 31.
The sand filling model part comprises a sand filling box 21 and a tiltable support frame 22, wherein quartz sand is filled in the sand filling box 21, a low-permeability block 211 is embedded in the quartz sand, the low-permeability block 211 is made of stainless steel materials, the leakage rate is extremely low, and the low-permeability block is used for simulating an interlayer; at least 3 simulated wellbores 212 are further inserted into the sand filling box 21, wherein the bottom of one simulated wellbore 212 is located above the low-permeability block 211, the bottom of the other two simulated wellbores 212 is located below the low-permeability block 211, and one simulated wellbore 212 penetrates through the low-permeability block 211, and the simulated wellbores 212 can be optionally used as an injection well and a production well to be respectively connected with the flow meter 12 and the back pressure valve 31 during an experiment, and the manner of one injection and two production in the embodiment is only taken as an example; the sand filling box 21 is positioned in the oil bath box 23, the bottom of the oil bath box 23 is sequentially connected with a hot oil circulating pump 231 and a heater 232, an outlet of the heater 232 is communicated with the top of the oil bath box 23, oil is filled in the oil bath box 23, and objects in the sand filling box 21 are heated by the heated oil, so that the temperature of the sand filling box 21 can be guaranteed to be over 200 ℃ under normal pressure, and the high temperature of a stratum can be simulated; the oil bath box 23 is positioned on the inclinable support frame 22, the inclinable support frame 22 comprises a top plate 222 and a bottom plate 223 which are respectively connected with the top and the bottom of three jacks 221, wherein the jacks 221 and the top plate 222 are connected in an articulated mode, so that the inclination of the sand filling box can be controlled by adjusting the heights of the three jacks, and the influence of different inclination interlayers on the recovery ratio can be simulated.
The part of the simulated shaft 212 in the sand filling box 21 is provided with small holes for fluid to pass through, and the outer wall of the simulated shaft 212 is provided with a plurality of layers of dense silk screens for intercepting impurities in the fluid to prevent blockage.
The method of the present invention has been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, which are only illustrative and not restrictive, and those skilled in the art can flexibly modify the experimental conditions and analysis methods and objects within the scope not exceeding the gist of the present invention, within the scope of the present invention.
Claims (5)
1. An experimental device for evaluating the influence of an interlayer and an injection-production point on the recovery ratio of a thick-layer oil reservoir comprises an injection part, a sand-packed model part and a displacement product metering part which are sequentially connected, wherein the injection part comprises a displacement pump, a flowmeter and a pressure gauge which are sequentially connected; the displacement product metering part comprises a pressure gauge, a return pressure control valve, a cooler and a measuring cylinder which are sequentially connected, and is characterized in that the sand filling model part comprises a sand filling box and a tiltable support frame, quartz sand is filled in the sand filling box, and a low-permeability block is embedded in the quartz sand and used for simulating an interlayer; at least 3 simulated mineshafts are inserted into the sand-packed box, wherein the bottom of one simulated mineshaft is positioned above the low-permeability block, the bottoms of the other two simulated mineshafts are positioned below the low-permeability block, and at least one simulated mineshaft penetrates through the low-permeability block, so that the simulated mineshafts can be optionally used as an injection well and a production well to be respectively connected with a flowmeter and a back-pressure valve during experiments; the sand filling box is positioned on the inclinable support frame, so that the inclination angle of the sand filling box can be adjusted, and the influence of interlayers with different inclination angles on the recovery ratio can be simulated.
2. The device of claim 1, wherein the hypotonic block is a stainless steel material.
3. The apparatus of claim 1, wherein the part of the simulated well bore in the sand filling box is provided with small holes for the fluid to pass through, and the outer wall of the simulated well bore is provided with a plurality of layers of dense wire meshes for intercepting impurities in the fluid to prevent blockage.
4. The device as claimed in claim 2, wherein the tiltable support frame comprises a top plate and a bottom plate which are respectively connected with the top and the bottom of the three jacks, wherein the jacks and the top plate are connected in a hinged manner.
5. The apparatus of claim 1, wherein the sand-pack box is located in an oil bath, and the temperature of the sand-pack pattern can be raised to 200 ℃ or higher under normal pressure by using the oil bath.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010087528.2A CN111155990A (en) | 2020-02-12 | 2020-02-12 | Experimental device for evaluating influence of interlayer and injection-production point on recovery ratio of thick-layer oil reservoir |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010087528.2A CN111155990A (en) | 2020-02-12 | 2020-02-12 | Experimental device for evaluating influence of interlayer and injection-production point on recovery ratio of thick-layer oil reservoir |
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| CN111155990A true CN111155990A (en) | 2020-05-15 |
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| CN202010087528.2A Pending CN111155990A (en) | 2020-02-12 | 2020-02-12 | Experimental device for evaluating influence of interlayer and injection-production point on recovery ratio of thick-layer oil reservoir |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112145149A (en) * | 2020-08-21 | 2020-12-29 | 中国地质大学（武汉） | Multiphase multi-field coupling transportation process simulation device for geothermal reservoir |
| CN116838335A (en) * | 2023-07-10 | 2023-10-03 | 中国石油大学(北京) | Multiphase seepage three-dimensional visual simulation device and method for well with complex structure |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4509365A (en) * | 1983-09-26 | 1985-04-09 | Fmc Corporation | Method and apparatus for weighing a sucker-rod pumped well |
| CN103184865A (en) * | 2012-12-18 | 2013-07-03 | 中国石油化工股份有限公司 | Variable-temperature-field displacement simulator for multi-thermal fluid |
| CN103953335A (en) * | 2014-05-12 | 2014-07-30 | 东北石油大学 | Physical simulation method for petroleum reservoir architecture and physical simulation device for petroleum reservoir architecture |
| CN105781509A (en) * | 2016-05-11 | 2016-07-20 | 西南石油大学 | Flat plate sand packing model percolation experiment system |
| RU2594402C1 (en) * | 2015-08-28 | 2016-08-20 | Открытое акционерное общество "Татнефть" им. В.Д. Шашина | Method for subsequent flooding of stratified reservoir |
| CN109283584A (en) * | 2018-11-09 | 2019-01-29 | 青岛大地新能源技术研究院 | Distribution type fiber-optic sonic test method and device applied to three-dimensional physical simulation |
| CN109356557A (en) * | 2018-12-12 | 2019-02-19 | 燕山大学 | Three-dimensional oil reservoir water drive simulation model preparation method and dynamic monitoring visualization device |
| CN109519156A (en) * | 2018-11-01 | 2019-03-26 | 中海石油(中国)有限公司上海分公司 | A kind of side water sand rock gas reservoir water drive section model Seepage Experiment method |
| CN110067545A (en) * | 2019-04-30 | 2019-07-30 | 中国石油化工股份有限公司 | Evaluation system is replaced in inhomogeneous physical simulation and foam flooding for strong bottom water reservoir |
| CN110130871A (en) * | 2019-04-09 | 2019-08-16 | 中国石油大学(北京) | Channel bar type physical models of reservoir and preparation method thereof and experimental method |
| CN209339921U (en) * | 2019-07-08 | 2019-09-03 | 西南石油大学 | A kind of experimental provision for analyzing vertical heterogeneity thick-layer model water drive oil |
| CN209780859U (en) * | 2019-09-02 | 2019-12-13 | 西南石油大学 | Low-permeability conglomerate oil reservoir fracturing horizontal well productivity simulation model |
-
2020
- 2020-02-12 CN CN202010087528.2A patent/CN111155990A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4509365A (en) * | 1983-09-26 | 1985-04-09 | Fmc Corporation | Method and apparatus for weighing a sucker-rod pumped well |
| CN103184865A (en) * | 2012-12-18 | 2013-07-03 | 中国石油化工股份有限公司 | Variable-temperature-field displacement simulator for multi-thermal fluid |
| CN103953335A (en) * | 2014-05-12 | 2014-07-30 | 东北石油大学 | Physical simulation method for petroleum reservoir architecture and physical simulation device for petroleum reservoir architecture |
| RU2594402C1 (en) * | 2015-08-28 | 2016-08-20 | Открытое акционерное общество "Татнефть" им. В.Д. Шашина | Method for subsequent flooding of stratified reservoir |
| CN105781509A (en) * | 2016-05-11 | 2016-07-20 | 西南石油大学 | Flat plate sand packing model percolation experiment system |
| CN109519156A (en) * | 2018-11-01 | 2019-03-26 | 中海石油(中国)有限公司上海分公司 | A kind of side water sand rock gas reservoir water drive section model Seepage Experiment method |
| CN109283584A (en) * | 2018-11-09 | 2019-01-29 | 青岛大地新能源技术研究院 | Distribution type fiber-optic sonic test method and device applied to three-dimensional physical simulation |
| CN109356557A (en) * | 2018-12-12 | 2019-02-19 | 燕山大学 | Three-dimensional oil reservoir water drive simulation model preparation method and dynamic monitoring visualization device |
| CN110130871A (en) * | 2019-04-09 | 2019-08-16 | 中国石油大学(北京) | Channel bar type physical models of reservoir and preparation method thereof and experimental method |
| CN110067545A (en) * | 2019-04-30 | 2019-07-30 | 中国石油化工股份有限公司 | Evaluation system is replaced in inhomogeneous physical simulation and foam flooding for strong bottom water reservoir |
| CN209339921U (en) * | 2019-07-08 | 2019-09-03 | 西南石油大学 | A kind of experimental provision for analyzing vertical heterogeneity thick-layer model water drive oil |
| CN209780859U (en) * | 2019-09-02 | 2019-12-13 | 西南石油大学 | Low-permeability conglomerate oil reservoir fracturing horizontal well productivity simulation model |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112145149A (en) * | 2020-08-21 | 2020-12-29 | 中国地质大学（武汉） | Multiphase multi-field coupling transportation process simulation device for geothermal reservoir |
| CN116838335A (en) * | 2023-07-10 | 2023-10-03 | 中国石油大学(北京) | Multiphase seepage three-dimensional visual simulation device and method for well with complex structure |
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Application publication date: 20200515 |