CN111364985B - Thin tube experiment device with pressure covering function and using method - Google Patents
Thin tube experiment device with pressure covering function and using method Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000002474 experimental method Methods 0.000 title claims description 15
- 239000010779 crude oil Substances 0.000 claims abstract description 51
- 239000007789 gas Substances 0.000 claims abstract description 43
- 239000004576 sand Substances 0.000 claims abstract description 39
- 239000012530 fluid Substances 0.000 claims abstract description 32
- 238000002347 injection Methods 0.000 claims abstract description 30
- 239000007924 injection Substances 0.000 claims abstract description 30
- 239000003921 oil Substances 0.000 claims abstract description 29
- 238000011084 recovery Methods 0.000 claims abstract description 23
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 22
- 238000000605 extraction Methods 0.000 claims abstract description 19
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 13
- 238000012360 testing method Methods 0.000 claims abstract description 12
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 11
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 8
- 238000011049 filling Methods 0.000 claims abstract description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 42
- 210000005239 tubule Anatomy 0.000 claims description 16
- 239000011148 porous material Substances 0.000 claims description 8
- 238000006073 displacement reaction Methods 0.000 claims description 6
- 239000006004 Quartz sand Substances 0.000 claims description 5
- 239000003292 glue Substances 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 239000000565 sealant Substances 0.000 claims description 5
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 238000000227 grinding Methods 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 2
- 238000011065 in-situ storage Methods 0.000 claims 1
- 238000013461 design Methods 0.000 abstract description 2
- 230000008569 process Effects 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- 238000005429 filling process Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000010561 standard procedure Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000012835 hanging drop method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- 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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/166—Injecting a gaseous medium; Injecting a gaseous medium and a liquid medium
- E21B43/168—Injecting a gaseous medium
-
- 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)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention relates to a thin tube experimental device with pressure covering function, which consists of a high-low temperature test box, a high-pressure kettle, a thin tube column, a rubber sleeve, a fluid injection system and a fluid extraction system, wherein a spiral groove is carved on the upper surface of the thin tube column, and two end points of the groove are respectively connected with the fluid injection system and the fluid extraction system through vertical round holes. The method for determining the mixed phase pressure of the injected gas and the crude oil by using the device comprises the following steps: filling sand into the thin pipe column groove and the round hole; injecting hydraulic oil into the high-pressure kettle, and injecting nitrogen into the sand filled in the groove of the thin pipe column; displacing nitrogen in the groove of the thin pipe column by using prepared formation crude oil; injecting gas to displace crude oil in the groove of the thin pipe column at a certain speed; and taking the crude oil recovery ratio R as an ordinate and the pressure P as an abscissa, and drawing a relation curve of R and P, wherein the crude oil recovery ratio is 90% of a corresponding pressure point, namely the miscible phase pressure of the injected gas and the crude oil. The invention has reliable principle and simple and convenient operation, and can provide technical support for the scheme design of the actual gas injection oil extraction process.
Description
Technical Field
The invention belongs to the field of oil gas development, and relates to a thin tube experiment device with pressure covering and a using method.
Background
The crude oil mainly exists in rock pores, the recovery rate is not high by adopting a conventional depressurization exploitation method, and particularly for low-permeability and ultra-low-permeability oil reservoirs, the conventional recovery rate is low due to the small diameter of the pore throat of the core, and the methods of water injection and chemical agent injection cannot be implemented, so that the gas injection oil recovery is the main recovery rate improving technology at present. The gas injection flooding comprises miscible flooding and immiscible flooding, and the two methods are mainly different in that whether the injected gas front edge and oil are miscible or not in the flooding process is realized, so that the efficiency of gas injection miscible flooding can reach 100% theoretically and is far higher than that of immiscible flooding.
When gas injection miscible flooding is carried out, one important parameter to be mastered in advance is the miscible pressure between the injected gas and the target crude oil at the reservoir temperature, so that whether the miscible flooding can be realized in the reservoir or not is judged. The existing methods for measuring the gas-oil mixed phase pressure comprise a thin tube method, a hanging drop method and the like, wherein the thin tube method is considered to be closest to the time process and has the highest reliability. However, the existing tubule method has some defects, such as no consideration of overburden pressure in the experimental process, limited permeability lower limit of tubule sand filling, sand can only be slowly filled into tubules, cementation between sand grains and the like cannot be considered, and the difference from the actual reservoir stratum is large.
The device and the method for evaluating the miscible pressure between the injected gas and the crude oil more reliably are established, and have important significance for improving the recovery ratio of the crude oil.
Disclosure of Invention
The invention aims to provide an experimental device with a pressure-covering tubule, which has a reliable principle and is simple and convenient to operate, can measure the miscible pressure between injected gas and crude oil under the condition of considering the pressure-covering of an oil reservoir, and provides technical support and theoretical basis for the design of an actual gas injection oil extraction process scheme.
The invention also aims to provide a method for determining the mixed phase pressure of the injected gas and the crude oil in the gas injection oil extraction process by using the device, which has the advantages of simple operation process, accurate and reliable test result, important support function for researching and applying the gas injection oil extraction process to improve the crude oil recovery rate, and wide application prospect.
In order to achieve the technical purpose, the invention adopts the following technical scheme.
A thin tube experimental device with pressure covering function comprises a high-pressure kettle, a thin tube column, a rubber sleeve, an auxiliary fixing ring, a support, a heating system, a fluid injection system and a fluid extraction system. The thin pipe column is a metal cylinder with a spiral groove carved on the upper surface, the starting point and the end point of the spiral groove vertically penetrate out of the lower surface of the cylinder and are used for connecting fluid injection and extraction pipelines, and the bottom of the circular hole comprises a filter screen and a pipeline interface; the inner diameter of the rubber sleeve is equivalent to the outer diameter of the upper surface of the thin pipe column; the autoclave is used for containing the thin pipe column and providing high confining pressure for the thin pipe column; a temperature control system was used to provide the experimental temperatures. The fluid injection system includes a high pressure pump, a sample dispenser, and an intermediate reservoir. The fluid production system comprises a back pressure valve, a gas meter, a crude oil collecting bottle and the like.
The method for determining the mixed-phase pressure of the injected gas and the crude oil by using the device sequentially comprises the following steps of:
(1) filling sand into the thin pipe column groove and the round hole, wherein the height of the sand in the groove is slightly higher than the upper surface of the thin pipe column;
(2) coating a layer of high-temperature-resistant sealant on the side surface of the thin pipe column, sleeving a rubber sleeve, placing the thin pipe column on a support in the high-pressure kettle through an auxiliary fixing ring outside the rubber sleeve, and connecting a fluid injection pipeline and a fluid extraction pipeline from a pipeline interface of a circular hole of the thin pipe column;
(3) setting the temperature as an oil reservoir temperature T, injecting hydraulic oil into the high-pressure kettle, simultaneously injecting nitrogen into sand filled in the groove of the thin pipe column, and always keeping the pressure in the high-pressure kettle higher than the pressure in the groove by 1MPa until the pressure in the groove reaches a set experimental pressure P;
(4) displacing nitrogen in the groove of the thin pipe column by using the prepared formation crude oil until the gas-oil ratio of production at the fluid extraction end is consistent with that of the prepared formation crude oil;
(5) the injected gas displaces the crude oil in the groove of the thin tubular column at a certain speed, and the displacement experiment is ended after the injected gas which is 1.2 times of the pore volume between the sand grains in the groove is injected;
(6) measuring the produced oil by using a measuring bottle, measuring the produced gas by using a gas meter, calculating the volume of the produced oil under T, P as V multiplied by B by combining the volume V of the collected degassed oil and the volume coefficient B of the formation crude oil, and dividing the volume of the produced oil by the pore volume between sand grains in the groove of the thin tubular column to obtain the crude oil recovery ratio R;
(7) setting another experiment pressure to repeat the steps (4) - (6), and testing 5-6 pressure points to ensure that the crude oil recovery ratio under at least 2 pressure points is less than 90 percent, and the crude oil recovery ratio under 2 pressure points is more than or equal to 90 percent;
(8) and taking the recovery ratio R of the crude oil obtained under each pressure point as an ordinate, taking the corresponding experimental pressure P as an abscissa, drawing a relation curve chart of R and P, and finding out the pressure point corresponding to the recovery ratio of the crude oil of 90 percent from the curve, namely the miscible phase pressure of the injected gas and the crude oil.
Preferably, the depth and width of the groove in the upper surface of the thin tubing string is no greater than 4mm, preferably 3 mm.
Preferably, the string of tubing is laid flat or set on its side on a support in the autoclave, preferably on its side on the support, with the tubing port of the tubing string bore facing the tubing connecting the fluid injection and production systems, to shorten the length of the connecting tubing.
Preferably, 1 string of tubing or optionally a plurality of strings of tubing may be used in series in the autoclave to extend the length of the groove in the column.
Preferably, the thickness of the thin pipe column is larger than the depth of the groove on the upper surface, and in order to control the weight of the thin pipe column, the thickness of the thin pipe column is controlled within 3 cm, preferably 1.5 cm.
Preferably, the heating system can adopt a high-low temperature test chamber, and can also adopt a heating jacket directly.
Preferably, the sand in the groove of the thin pipe column can be quartz sand or sand after actual core grinding on site, and only quartz sand or sand can be filled in the filling process or quartz sand or sand can be mixed with high temperature resistant glue to be filled in. The actual core after grinding is preferably filled by mixing with a high temperature resistant glue, so that the actual core is more like a reservoir cemented core.
Preferably, the height of the sand filled in the groove of the thin pipe column is slightly higher than the upper surface of the thin pipe column, so that the rubber sleeve can apply covering pressure on the sand in the experimental process, and the height of the sand is preferably 2 mm higher than the upper surface of the thin pipe column.
Compared with the existing thin pipe method, the method can research the minimum miscible phase pressure between the injected gas and the crude oil in the oil reservoir under different pressure covering conditions; the sand grains after actual core grinding are used as fillers, and meanwhile, the cementation of the sand grains is considered, so that the sand grains are closer to an actual reservoir; the whole thin pipe column is soaked in hydraulic oil, and the experimental pressure can be higher (the existing thin pipe experimental methods are all lower than 70 MPa). The invention has important significance for the application of the gas injection miscible phase flooding oil extraction technology.
Drawings
FIG. 1 is a schematic structural diagram of a thin tube experimental device with a covering pressure (thin tube column is side-up).
Fig. 2 is a plan view of the thin tubing string laid flat.
FIG. 3 is a flat front view of the thin tubing string.
Fig. 4 is a bottom plan view of the thin tubing string.
In the figure:
1-high and low temperature test chamber; 2-high pressure autoclave; 3. 40-a rubber sleeve; 4. 42-a string of tubing; 5. 41-auxiliary fixing ring; 6. 7-vertical round holes; 8-a scaffold; 9-lifting the handle; 10-a support bar; 11. 12, 13, 14, 19, 20, 22, 25, 26, 27, 34-two-way valve; 15-a back pressure valve; 16-an intermediate container; 17-hydraulic oil; 18-a piston; 21. 28, 33-three-way valve; 23-high temperature and high pressure sample matching device; 24-formulated formation crude oil; 29-a measuring flask; 30-gas meter; 31-a displacement pump; 32-gas or nitrogen injection; 35-a chromatograph; 36-a high pressure pump; 37. 39-groove end points; 38-a groove; 43. 44-pipeline interface.
Detailed Description
The invention is further illustrated below with reference to the figures and examples in order to facilitate the understanding of the invention by a person skilled in the art. It is to be understood that the invention is not limited in scope to the specific embodiments, but is intended to cover various modifications within the spirit and scope of the invention as defined and defined by the appended claims, as would be apparent to one of ordinary skill in the art.
See fig. 1, 2, 4.
A thin tube experimental device with pressure covering function is composed of a high-low temperature test box 1, a high-pressure kettle 2, a thin tube column 4, a rubber sleeve 3, a fluid injection system and a fluid extraction system.
The high-pressure autoclave 2 is arranged in the high-low temperature test box 1, the high-pressure autoclave is connected with an intermediate container 16 and a displacement pump 31, and hydraulic oil 17 and a piston 18 are arranged in the intermediate container; the thin pipe column 4 is externally coated with a rubber sleeve 3, the thin pipe column is placed on a support 8 (the support is respectively connected with a lifting handle 9 and a supporting rod 10) of the high-pressure kettle through an auxiliary fixing ring 5 on the outer side of the rubber sleeve, the thin pipe column is a metal cylinder, a spiral groove 38 is carved on the upper surface of the thin pipe column, two end points 37 and 39 of the groove are respectively communicated with two vertical round holes 6 and 7 penetrating through the cylinder, the bottoms of the round holes 6 and 7 are provided with a filter screen and pipeline interfaces 43 and 44, and the two end points 37 and 39 of the spiral groove are respectively connected with a fluid injection system and a fluid extraction system through the pipeline interfaces 43 and 44 at the bottoms of the vertical round holes 6 and 7; the fluid injection system comprises two high-temperature high-pressure sample distributors 23 and a high-pressure pump 36, wherein the sample distributors are respectively filled with prepared formation crude oil 24 and injection gas or nitrogen 32; the fluid production system includes a back pressure valve 15, a metering cylinder 29, a gas meter 30, and a chromatograph 35.
See fig. 3.
Fig. 3 shows a flat thin tubular column, wherein a layer of high temperature resistant sealant is coated on the side surface of the thin tubular column 42, and is covered with a rubber sleeve 40, and an auxiliary fixing ring 41 is additionally arranged on the outer side of the rubber sleeve.
The application method of the thin tube experimental device with the overpressure function comprises the following specific implementation modes:
(1) horizontally placing the thin pipe column, engraving a spiral groove with a certain depth on the upper surface of the thin pipe column, communicating two end points of the groove with a round hole penetrating through the lower ground of the thin pipe column, filling sand grains into the round hole and the groove, wherein the accumulation height of the sand grains in the groove is slightly higher than the upper surface of the metal column by 2 mm, and simultaneously adding a small amount of high-temperature-resistant glue to preliminarily glue the sand grains in the sand filling process;
(2) coating high-temperature-resistant sealant on the side surface of the thin pipe column, sleeving a rubber sleeve, enabling the rubber sleeve to be in close contact with the side surface of the thin pipe column through the sealant coating, and installing an auxiliary fixing ring;
(3) putting the thin pipe column into a high-pressure kettle support in a side-standing manner, and connecting a fluid injection pipeline and a fluid extraction pipeline from a circular hole on the bottom surface of the thin pipe column;
(4) installing an upper sealing cover and a lower sealing cover of the high-pressure kettle, injecting hydraulic oil into the high-pressure kettle, and simultaneously injecting nitrogen into sand in the groove of the thin pipe column through an injection system; the pressure in the high-pressure kettle is always ensured to be higher than the pressure of sand filled in the fine tube groove by about 1MPa until the pressure in the fine tube groove reaches the set experimental pressure (P);
(5) opening the high-low temperature test box, setting the temperature as the oil reservoir temperature (T), heating the high-pressure kettle, the internal fluid and the components, and always ensuring the pressure in the high-pressure kettle and the thin tube groove to be basically unchanged through the high-pressure pump;
(6) after the temperature and the pressure in the autoclave are completely stabilized, referring to the prior standard method SY/T6573-2016 (the lowest miscible phase pressure experiment determination method-the tubule standard method), filling nitrogen in sand into the tubule groove by using the prepared formation crude oil sample to displace until the gas-oil ratio produced by the fluid at the outlet end of the tubule is consistent with the prepared formation crude oil sample;
(7) displacing the crude oil in the fine pipe groove by high-temperature and high-pressure injected gas at a certain speed, and finishing the displacement experiment after injecting the injected gas which is 1.2 times of the pore volume in the sand grains;
(8) the produced oil sample is measured by a measuring bottle, and the produced gas is measured by a gas meter. Combining the volume (V) of the collected degassed oil and the volume coefficient (B) of the formation crude oil, calculating the volume (V multiplied by B) of the produced crude oil at T, P, and dividing the volume by the pore volume of the fine groove sand grains to obtain the crude oil recovery rate (R);
(9) and (4) cleaning sand grains in the thin tube groove by using petroleum ether, and setting another experiment pressure again to repeat the steps (6) to (8). Carrying out 5-6 pressure experimental tests to ensure that the crude oil recovery rate under at least 2 pressure points is less than 90 percent, and the crude oil recovery rate under 2 pressure points is more than or equal to 90 percent;
(10) and taking the final recovery ratio R of the crude oil obtained under each pressure point as an ordinate, taking the corresponding experimental pressure P as an abscissa, and making a relation curve of R and P, wherein the pressure point corresponding to the recovery ratio of the crude oil of 90 percent is the miscible phase pressure of the injected gas and the crude oil.
The present invention is not limited to the above-described embodiments, and various modifications are possible for those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The thin tube experimental device with the pressure covering function is composed of a high-low temperature test box (1), an autoclave (2), a thin tube column (4), a rubber sleeve (3), a fluid injection system and a fluid extraction system, and is characterized in that the autoclave (2) is arranged in the high-low temperature test box (1), the autoclave is connected with an intermediate container (16) and a displacement pump (31), and hydraulic oil (17) and a piston (18) are arranged in the intermediate container; the thin pipe column (4) is externally coated with a rubber sleeve (3), the thin pipe column is placed on a support (8) of the high-pressure kettle through an auxiliary fixing ring (5) on the outer side of the rubber sleeve, the thin pipe column is a metal cylinder, a spiral groove (38) is carved on the upper surface of the thin pipe column, a first endpoint (37) and a second endpoint (39) of the groove are respectively communicated with a first vertical round hole (6) and a second vertical round hole (7) which penetrate through the cylinder, a filter screen, a first pipeline interface (43) and a second pipeline interface (44) are arranged at the bottom of the round holes, and the two endpoints of the spiral groove are respectively connected with a fluid injection system and a fluid extraction system through pipeline interfaces at the bottom of the vertical round holes; the fluid injection system comprises two high-temperature high-pressure sample distributors (23) and a high-pressure pump (36), wherein the sample distributors are respectively filled with prepared formation crude oil, injection gas or nitrogen; the fluid extraction system comprises a back pressure valve (15), a metering bottle (29), a gas meter (30) and a chromatograph (35).
2. The covered pressure tubule experiment device of claim 1, wherein the depth and width of the groove on the upper surface of the tubule column are not more than 4 mm.
3. The covered pressure tubule experiment device of claim 1, wherein the tubule column is laid flat or side-erected on a support in the autoclave.
4. The covered pressure tubule experiment device according to claim 1, wherein 1 tubule column or a plurality of tubule columns are used in series in the autoclave.
5. The covered pressure tubule experiment device according to claim 1, wherein the thickness of the tubule column is controlled within 3 cm.
6. A method of determining the miscible pressure of injected gas and crude oil using the apparatus of claim 1, 2, 3, 4 or 5, comprising the steps of, in order:
(1) filling sand into the thin pipe column groove and the round hole, wherein the height of the sand in the groove is slightly higher than the upper surface of the thin pipe column;
(2) coating a layer of high-temperature-resistant sealant on the side surface of the thin pipe column, sleeving a rubber sleeve, placing the thin pipe column on a support in the high-pressure kettle through an auxiliary fixing ring outside the rubber sleeve, and connecting a fluid injection pipeline and a fluid extraction pipeline from a pipeline interface of a circular hole of the thin pipe column;
(3) setting the temperature as an oil reservoir temperature T, injecting hydraulic oil into the high-pressure kettle, simultaneously injecting nitrogen into sand filled in the groove of the thin pipe column, and always keeping the pressure in the high-pressure kettle higher than the pressure in the groove by 1MPa until the pressure in the groove reaches a set experimental pressure P;
(4) displacing nitrogen in the groove of the thin pipe column by using the prepared formation crude oil until the gas-oil ratio of production at the fluid extraction end is consistent with the gas-oil ratio of the prepared formation crude oil;
(5) injecting gas to displace crude oil in the groove of the thin tubular column, and finishing the displacement experiment after the volume of the injected gas reaches 1.2 times of the volume of pores among sand grains in the groove;
(6) measuring the produced oil by using a measuring bottle, measuring the produced gas by using a gas meter, calculating the volume of the produced oil under T, P as V multiplied by B by combining the volume V of the collected degassed oil and the volume coefficient B of the formation crude oil, and dividing the volume of the produced oil by the pore volume between sand grains in the groove of the thin tubular column to obtain the crude oil recovery ratio R;
(7) setting another experiment pressure to repeat the steps (4) - (6), and testing 5-6 pressure points to ensure that the crude oil recovery ratio under at least 2 pressure points is less than 90 percent, and the crude oil recovery ratio under 2 pressure points is more than or equal to 90 percent;
(8) and taking the recovery ratio R of the crude oil obtained under each pressure point as an ordinate, taking the corresponding experimental pressure P as an abscissa, drawing a relation curve chart of R and P, and finding out the pressure point corresponding to the recovery ratio of the crude oil of 90 percent from the curve, namely the miscible phase pressure of the injected gas and the crude oil.
7. The method of claim 6, wherein the sand in the groove of the string of tubing is selected from quartz sand or sand after grinding of an actual core in situ.
8. The method of claim 7, wherein the filling is performed by mixing quartz sand or sand with a refractory glue.
9. The method of claim 6, wherein the string recess is filled with sand at a height of 2 mm above the upper surface of the string.
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| CN102016228A (en) * | 2008-04-30 | 2011-04-13 | 雪佛龙美国公司 | Method of miscible injection testing of oil wells and system thereof |
| CN105134158A (en) * | 2015-08-26 | 2015-12-09 | 中国石油天然气股份有限公司 | Fracturing method for supplementing stratum energy of dense oil reservoir |
| CN109690311A (en) * | 2016-08-09 | 2019-04-26 | 沙特***石油公司 | Multi-functional diplocardia displacement of reservoir oil device and method |
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