CN111734342B - Oil reservoir engineering simulation sand filling experimental device - Google Patents
Oil reservoir engineering simulation sand filling experimental device Download PDFInfo
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- CN111734342B CN111734342B CN202010514738.5A CN202010514738A CN111734342B CN 111734342 B CN111734342 B CN 111734342B CN 202010514738 A CN202010514738 A CN 202010514738A CN 111734342 B CN111734342 B CN 111734342B
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- 239000004576 sand Substances 0.000 title claims abstract description 112
- 238000004088 simulation Methods 0.000 title claims description 14
- 238000007789 sealing Methods 0.000 claims abstract description 71
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 64
- 238000003825 pressing Methods 0.000 claims abstract description 28
- 238000005192 partition Methods 0.000 claims abstract description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 106
- 210000005239 tubule Anatomy 0.000 claims description 36
- 239000006004 Quartz sand Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 10
- 239000012780 transparent material Substances 0.000 claims description 3
- 238000002474 experimental method Methods 0.000 abstract description 13
- 230000035699 permeability Effects 0.000 abstract description 11
- 239000011435 rock Substances 0.000 abstract description 10
- 239000003921 oil Substances 0.000 description 43
- 235000019198 oils Nutrition 0.000 description 39
- 239000007788 liquid Substances 0.000 description 12
- 230000000694 effects Effects 0.000 description 7
- 230000008569 process Effects 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 4
- 235000019476 oil-water mixture Nutrition 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 229920000642 polymer Polymers 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000005465 channeling Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 241000237858 Gastropoda Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 239000002699 waste material Substances 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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
-
- 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
-
- 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
- G09B25/04—Models for purposes not provided for in G09B23/00, e.g. full-sized devices for demonstration purposes of buildings
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- Mining & Mineral Resources (AREA)
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- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Business, Economics & Management (AREA)
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Abstract
The invention discloses a simulated sand filling experimental device for oil reservoir engineering, which comprises a sand filling pipe, a water supply container, an oil supply container, an air source and a collecting device, wherein the sand filling pipe is connected with the water supply container; the water supply container and the oil supply container are both connected with one end of the sand filling pipe, and the air source and the collecting device are connected with the other end of the sand filling pipe; a partition plate is arranged in the sand filling pipe, and divides the sand filling pipe into an oil-water chamber at the lower part and a sand filling chamber at the upper part; the sand filling chamber comprises a plurality of same sand filling thin tubes, a push rod is arranged in each sand filling thin tube, each push rod is of a hollow structure, and a self-sealing pressing plate is fixedly sleeved at the position, close to the bottom, of each push rod; a top cover is arranged at the top of the sand filling chamber, and each push rod penetrates through the top cover and is connected with the collecting device; the air source is connected with the plurality of self-sealing pressing plates through second pipelines. The oil reservoir engineering simulated sand filling experimental device can be used for carrying out experiments on simulated rock cores with different permeabilities at one time, can also be used for carrying out experiments on simulated rock cores with different lengths at one time, can carry out comparison and observation more intuitively, and is simple and convenient to operate.
Description
Technical Field
The invention relates to the technical field of oil extraction processes, in particular to a simulated sand filling experimental device for oil reservoir engineering.
Background
In the middle and later development stages of the oil field, the oil field enters the middle and later stages with high water content, and the comprehensive water content reaches more than 80 percent, and some even reaches 90 percent. The utilization rate of injected water is low, the development benefit is low, and the method is related to large pore channels formed in reservoirs. In the stratum with developed macropores, the macropores become dominant channels for the seepage of injected water, and the swept range of an injected medium is difficult to increase. Inefficient or ineffective circulation of injected water along large channels makes other parts in the reservoir difficult to be affected, and the oil displacement efficiency is seriously affected, so that the saturation difference of residual oil on the plane is obvious. Injected water channeling and premature flooding of oil wells have severely restricted crude oil production. Once the oil field development enters a middle-high water-cut period, other production increasing measures are difficult to realize due to the existence of large pores, such as profile control, high permeability zones and the large pores can also cause polymer solution channeling, so that not only is polymer waste caused, but also high-quality polymer slugs are difficult to form, so that surrounding production wells do not take effect or take effect poorly, the polymer flooding effect is seriously influenced, and the stable yield and the final recovery rate of the oil field are seriously influenced. Before actual operation is carried out to improve the recovery ratio, indoor physical simulation experiments are usually carried out to provide basic data for numerical simulation and optimization of process parameters. The sand filling pipe is a basic device for an indoor physical simulation experiment, oil reservoir conditions such as different wettability, porosity and permeability are simulated by filling particles of different materials and different particle sizes in the sand filling pipe, and the application range is very wide.
In the prior art, the sand-packed pipe that generally adopts is the fixed length formula, promptly: the length of the sand filling pipe is fixed, the sand filling pipe is filled with particles in the using process and can be used, the length of the simulated core is the length of the sand filling pipe, and different experimental requirements are met by arranging a series of sand filling pipes with different lengths. However, in practical experiments, the fixed-length sand filling pipes are not adjustable in length, and laboratories need to be equipped with sand filling pipes with different lengths, so that the sand filling pipes are inconvenient to store, and the economic cost is increased.
In addition, the existing sand filling pipe can only fill one kind of quartz sand at a time, and cannot carry out visual comparative observation on sandstone oil reservoirs with different permeability through one experiment; when the simulation rock core to different length is tested, also need divide the lot and fill the experiment, all need clear up the sand pack pipe after every experiment, the operation is more loaded down with trivial details.
Disclosure of Invention
Aiming at the problems, the invention aims to provide an oil reservoir engineering simulated sand filling experimental device which can be used for carrying out experiments on simulated rock cores with different permeabilities at one time and can also be used for carrying out experiments on simulated rock cores with different lengths at one time, so that the comparative observation and analysis can be visually carried out, the operation is simpler and more convenient, and the cost is lower.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a simulated sand filling experimental device for oil reservoir engineering comprises a sand filling pipe, a water supply container, an oil supply container, an air source and a collecting device; the water supply container and the oil supply container are both connected with one end of the sand filling pipe, and the gas source and the collecting device are connected with the other end of the sand filling pipe; the method is characterized in that: a partition plate is arranged in the sand filling pipe and divides the sand filling pipe into an oil-water chamber at the lower part and a sand filling chamber at the upper part; the bottom of the oil water chamber is provided with a connecting hole, and the water supply container and the oil supply container are connected with the connecting hole through a first pipeline;
the sand filling chamber comprises a plurality of same sand filling thin tubes, both ends of each sand filling thin tube are of an open structure, the contact positions of the partition plates and the bottoms of the plurality of sand filling thin tubes are of a net-shaped structure, and the net-shaped structure can only pass oil and water but cannot pass quartz sand; a push rod is arranged in each sand filling thin tube, the push rod is of a hollow structure, and a self-sealing pressure plate is fixedly sleeved at the position, close to the bottom, of the push rod;
a top cover is arranged at the top of the sand filling chamber, and each push rod penetrates through the top cover and is connected with the collecting device; the air source is connected with the self-sealing pressing plate through a second pipeline.
Furthermore, the self-sealing pressure plate comprises an upper pressure plate and a lower pressure plate, the outer side surfaces of the upper pressure plate and the lower pressure plate are both contacted with the inner side wall of the sand filling tubule, and a self-sealing chamber is formed between the upper pressure plate and the lower pressure plate;
first seal grooves are formed in the bottom of the upper pressure plate and the edge of the top of the lower pressure plate, first axial universal plug rings are mounted in the first seal grooves, and the two first axial universal plug rings are arranged oppositely;
the upper pressing plate is provided with a gas through hole, the gas through hole is connected with a gas pipeline, and the gas pipeline penetrates out of the top cover and is connected with the gas source through a second pipeline; and a second valve is arranged on the second pipeline and is positioned outside the sand filling fine pipe.
Furthermore, the push rod comprises an upper push rod and a lower push rod, and the top of the upper push rod penetrates through the top cover and is connected with the collecting device through a third pipeline;
the bottom of the upper push rod penetrates through the upper pressure plate; the upper push rod is fixedly connected with the upper pressure plate;
the top of the lower push rod is positioned between the upper pressing plate and the lower pressing plate, the bottom of the lower push rod penetrates through the lower pressing plate, and the lower push rod is fixedly connected with the lower pressing plate;
the upper push rod and the lower push rod are detachably connected, and a sealing structure is further arranged at the joint of the upper push rod and the lower push rod.
Furthermore, corrugated pipes are adopted at the position of the second pipeline close to the gas source and at the position of the third pipeline close to the collecting device.
Furthermore, seal structure is including establishing the second seal groove at last push rod bottom or push rod top down, be equipped with radial general stopper circle in the second seal groove.
Further, the upper push rod and the lower push rod are both external thread rods, and sleeves are connected with the external threads of the upper push rod and the lower push rod; and a plurality of fins are arranged on the periphery of the sleeve.
Furthermore, a filter screen is arranged at the bottom of the lower push rod.
Furthermore, the upper push rod is connected with a fixing nut in a threaded manner, the fixing nut is located above the top cover, and a limiting and fixing device is arranged between the fixing nut and the top cover.
Furthermore, the limiting and fixing device comprises a positioning groove arranged on the top cover, and the diameter of the positioning groove is smaller than that of the fixing nut;
the surface of the positioning groove is provided with threads, the bottom of the fixing nut is fixedly connected with a connecting rod, the connecting rod is of a hollow structure, and the outer surface of the connecting rod is provided with external threads matched with the threads on the surface of the positioning groove; and a central hole for the upper push rod to pass through is formed in the center of the positioning groove.
Furthermore, the sand filling tubule is made of transparent materials, and scale marks for positioning the height of the lower pressing plate are arranged on the sand filling tubule.
The invention has the beneficial effects that: compared with the prior art, the invention has the improvement that,
1. the sand filling pipe is divided into a plurality of sand filling thin pipes, quartz sand with different particle sizes can be filled into different sand filling thin pipes, experimental simulation of oil-water displacement material resources is carried out under the condition of different permeability, and an oil-water chamber is arranged at the bottom of each sand filling thin pipe to ensure that oil-water mixtures entering different sand filling thin pipes are the same, so that the relation between the oil-water displacement and the core permeability under the condition of different permeability is visually observed in a contrast manner;
2. the sand filling pipe can also simultaneously perform plugging experimental simulation of different core lengths, and the cores with different lengths are filled in a plurality of sand filling tubules, so that the plugging effect is visually compared and observed when the core lengths are different;
3. according to the sand filling tubule, the self-sealing pressing plate is adopted, when a rock core is compacted, gas is injected into a self-sealing cavity formed between the upper pressing plate and the lower pressing plate, the first axial plunger ring on the upper pressing plate and the first axial plunger ring on the lower pressing plate form sealing under the action of air pressure, the sealing effect is better when the air pressure is higher, and the sealing performance of the sand filling tubule can be ensured only by injecting enough gas into the self-sealing cavity during an experiment;
4. the push rod in the sand filling tubule is divided into an upper part and a lower part, the upper push rod is detachably connected with the lower push rod, the universal plug ring is convenient to replace by the upper press plate and the lower press plate, the fins are arranged on the outer side of the sleeve, the heat energy of an oil-water mixture in the push rod can be diffused into the self-sealing cavity, the gas in the self-sealing cavity is added, the gas pressure is increased along with the rise of the temperature under the condition that the volume is not changed, the gas pressure is increased, and the sealing effect of the universal plug ring is better;
5. according to the invention, the sand-filling tubule push rod drives the self-sealing press plate to move up and down, after the core length is set, the push rod can be limited through the fixing nut and the fixing limiting device above the top cover, and the self-sealing press plate is prevented from moving upwards due to upward reaction force generated on the self-sealing press plate during oil-water displacement, so that the accuracy of an experimental result is prevented from being influenced.
Drawings
FIG. 1 is a schematic structural diagram of a simulated sand-pack experimental facility according to the present invention.
FIG. 2 is a schematic view of the sand-packed pipe structure according to the present invention.
FIG. 3 is an enlarged view of a portion A of FIG. 2 according to the present invention.
FIG. 4 is a schematic view of the connection between the upper pushing plate and the lower pushing plate.
FIG. 5 is a partial enlarged view of portion B of FIG. 4 according to the present invention.
FIG. 6 is a top view of a separator plate structure according to the present invention.
FIG. 7 is a schematic view of the connection between the push plate and the top cover according to the present invention.
Fig. 8 is a top view of a top cover structure of the present invention.
Wherein: 1-sand filling pipe, 11-clapboard, 12-oil water chamber, 121-connecting hole, 13-sand filling tubule, 131-push rod, 1311-upper push rod, 1312-lower push rod, 1313-second sealing groove, 1314-radial universal plug ring, 1315-filter screen, 1316-fixed nut, 1317-connecting rod, 14-self-sealing pressure plate, 141-upper pressure plate, 142-lower pressure plate, 143-self-sealing chamber, 144-first sealing groove, 145-first axial universal plug ring, 146-gas through hole, 147-gas pipeline, 15-top cover, 151-positioning groove, 1511-central hole, 16-sleeve, 161-fin, 162-third sealing groove, 163-second axial universal plug ring, 2-water supply container and 3-oil supply container, 4-gas source, 5-collecting device, 6-first pipeline, 61-oil pipeline, 62-water pipeline, 63-oil valve, 64-water valve, 7-second pipeline, 71-second valve, 72-gas source bus, 8-third pipeline and 9-gas pump.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the following further describes the technical solution of the present invention with reference to the drawings and the embodiments.
Referring to the attached drawings 1-8, the oil reservoir engineering simulation sand filling experimental device comprises a sand filling pipe 1, a water supply container 2, an oil supply container 3, an air source 4 and a collecting device 5;
the sand filling pipe 1 is of a cylindrical structure, a partition plate 11 is fixedly bonded in the sand filling pipe 1, and the partition plate 11 divides the sand filling pipe 1 into an oil-water chamber 12 at the lower part and a sand filling chamber at the upper part; a connecting hole 121 is formed in the bottom of the oil water chamber 12, and the water supply container 2 and the oil supply container 3 are both connected with the connecting hole 121 through a first pipeline 6; one end of the first pipeline 6 is connected with the connecting hole 121, the other end of the first pipeline is connected with a tee joint, the tee joint is respectively connected with an oil pipeline 61 and a water pipeline 62, the oil pipeline 61 is connected with the oil supply container 3, the water pipeline 62 is connected with the water supply container 2, the oil pipeline 61 and the water pipeline 62 are respectively provided with an air pump 9, a water valve 64 is arranged between the water supply container 2 and the corresponding air pump 9, and an oil valve 63 is arranged between the oil supply container 3 and the corresponding air pump 9. The air pump 9 can inject water or oil in the corresponding water supply container 2 or oil supply container 3 into the oil-water chamber 12 of the sand filling pipe 1 through the first pipeline 6; pressure gauges are arranged on the water pipeline 62 and the oil pipeline 61 and used for adjusting and monitoring the pressure of the corresponding air pump 9; a switch is further arranged on the first pipeline 6 close to the connecting hole 121.
The sand-filling chamber comprises a plurality of identical sand-filling tubules 13, and the number of the sand-filling tubules 13 is three in this embodiment. The two ends of each sand filling tubule 13 are of an open structure, the bottom of each sand filling tubule 13 is fixedly connected with the partition plate 11, the contact part of each partition plate 11 and the bottom of each sand filling tubule 13 is of a net structure, and the rest parts are of solid structures, wherein the net structure can only pass through oil and water but cannot pass through quartz sand; oil and water in the oil and water chamber 12 can enter the upper sand-filled tubule 13 from the mesh structure, but quartz sand in the sand-filled tubule 13 cannot fall into the lower oil and water chamber 12 from the mesh structure; the top of sand pack tubule 13 with the top of sand pack 1 flushes, the top of sand pack 1 is equipped with top cap 15, top cap 15 with sand pack 1 can dismantle the connection, preferred, top cap 15 with sand pack 1 adopts flange joint.
Furthermore, a push rod 131 is arranged in each sand filling tubule 13, and the top of the push rod 131 penetrates through the top cover 15 and is positioned above the top cover 15; the push rod 131 is a hollow structure, and the hollow structure in the push rod 131 forms a flow channel of liquid; a self-sealing pressure plate 14 is fixedly sleeved at the position, close to the bottom, of the push rod 131; the self-sealing pressure plate 14 can move up and down in the sand filling tubule 13 under the pushing and pulling action of the push rod 131, so that simulated cores with different lengths can be filled and compacted.
Further, the self-sealing pressure plate 14 comprises an upper pressure plate 141 and a lower pressure plate 142, the push rod 131 comprises an upper push rod 1311 and a lower push rod 1312, the top of the upper push rod 1311 penetrates through the top cover 15, the bottom of the upper push rod 1311 penetrates through the upper pressure plate 141 and is located between the upper pressure plate 141 and the lower pressure plate 142, and the upper push rod 1311 and the upper pressure plate 141 are fixedly bonded;
the top of the lower push rod 1312 is positioned between the upper pressing plate 141 and the lower pressing plate 142, the bottom of the lower push rod 1312 penetrates through the lower pressing plate 142, the bottom of the lower push rod 1312 is flush with the bottom of the lower pressing plate 142, and the lower push rod 1312 and the lower pressing plate 142 are fixedly bonded;
the upper push rod 1311 and the lower push rod 1312 are both externally threaded rods, a sleeve 16 is connected to the upper push rod 1311 and the lower push rod 1312 through external threads, and the upper push rod 1311 and the lower push rod 1312 are detachably connected through the sleeve 16;
the outer side surfaces of the upper pressure plate 141 and the lower pressure plate 142 are both in contact with the inner side wall of the sand filling tubule 13, a self-sealing chamber 143 is formed between the bottom surface of the upper pressure plate 141 and the top surface of the lower pressure plate 142, and the sleeve 16 is positioned in the self-sealing chamber 143; the top inner edge and the bottom inner edge of the sleeve 16 are provided with a third sealing groove 162, the third sealing groove 162 is provided with a second axial stopper ring 163, the second axial stopper ring 163 at the top inner edge of the sleeve 16 is opened upwards, and the second axial stopper ring 163 at the bottom inner edge of the sleeve 16 is opened downwards.
In order to ensure the sealing performance of the self-sealing chamber 143, first sealing grooves 144 are formed in the bottom of the upper pressure plate 141 and the outer edge of the top of the lower pressure plate 142, first axial full plug rings 145 are installed in the first sealing grooves 144, the first axial full plug rings 145 at the bottom of the upper pressure plate 141 are downward opened, and the first axial full plug rings 145 at the top of the lower pressure plate 142 are upward opened.
Further, an air through hole 146 is formed in the upper pressure plate 141, the air through hole 146 is communicated with the self-sealing chamber 143, an air pipeline 147 is connected to the air through hole 146, and the air pipeline 147 penetrates through the top cover 15 and is connected to the air source 4 through a second pipeline 7; a second valve 71 is arranged on the second pipeline 7, and the second valve 71 is positioned outside the sand filling tubule 13; preferably, the three second pipelines 7 can be connected to the same air source bus 72 at positions close to the air sources 4, and a pressure gauge is arranged on the air source bus 72. Each second pipeline 7 is a corrugated pipe close to the air supply bus 72, and because the position of the air supply bus 72 is unchanged, the heights of the top portions of the air pipelines 147 are different when the heights of the upper pressure plates 141 in the three sand-filling tubules 13 are different, and the lengths between the air pipelines 147 and the air supply bus 72 are different, the second pipeline 7 is set to be a corrugated pipe, so that the connection between the air pipelines 147 connected to the upper pressure plates 141 with different heights and the air supply bus 72 can be met.
In practical use, gas needs to be filled into the self-sealing chamber 143, the self-sealing chamber 143 is filled with the gas 143, when the gas is filled into the self-sealing chamber 143, the pressure of the gas in the self-sealing chamber 143 gradually increases with the continuous filling of the gas in the self-sealing chamber 143, openings of the first axial jamming ring 145 and the second axial jamming ring 163 are pressed under the action of air pressure, the sealing performance of the first axial jamming ring 145 and the second axial jamming ring 163 is gradually enhanced with the increase of the gas pressure, and the gas can be effectively prevented from leaking from gaps of contact surfaces of the upper pressing plate 141, the lower pressing plate 142 and the sand filling tubule 13, and gaps of contact surfaces of the upper push rod 1311, the lower push rod 1312 and the sleeve 16, and the self-sealing is performed by the gas filled into the self-sealing chamber 143, so that the sealing performance of a simulated core part in an experimental process is ensured.
Furthermore, a plurality of fins 161 are arranged on the outer periphery of the sleeve 16, the fins 161 can diffuse the temperature of the liquid in the push rod 131 into the self-sealing chamber 143, so that the temperature of the gas in the self-sealing chamber 143 is increased, according to the bernoulli method, under the condition that the volume of the self-sealing chamber 143 is not changed, the higher the temperature of the gas is, the higher the pressure is, and the sealing performance of the first axial flooding ring 145 and the second axial flooding ring 163 is also better along with the increase of the gas pressure, so that the arrangement of the fins on the sleeve 16 can further ensure the sealing performance of the sand-packed tubule 13 in the experimental process.
Furthermore, in order to prevent the liquid in the upper push rod 1311 and the lower push rod 1312 from flowing into the gaps between the upper push rod 1311, the lower push rod 1312 and the sleeve 16 at joints, a sealing structure is further arranged at the joint of the upper push rod 1311 and the lower push rod 1312; the method specifically comprises the following steps: a second sealing groove 1313 is formed in the bottom of the upper push rod 1311 or the inner side edge of the top of the lower push rod 1312, a radial plunger ring 1314 is arranged in the second sealing groove 1313, an opening of the radial plunger ring 1314 faces to the center of the section of the upper push rod 1311 or the lower push rod 1312, when liquid flows in the upper push rod 1311 and the lower push rod 1312, the radial plunger ring 1314 is squeezed, the radial plunger ring 1314 can play a good sealing role in the squeezing process, and the liquid in the push rod 131 is prevented from entering a gap between the push rod 131 and the sleeve 16.
Further, in order to prevent core debris, powder and the like at the bottom of the lower pressing plate 142 from entering the push rod 131 to block the flow channel inside the push rod 131, a filter screen 1315 is arranged at the end of the lower push rod 1312; specifically, a mounting groove is formed at the bottom end of the lower pressing plate 142, the cross-sectional area of the mounting groove is larger than that of the bottom of the lower push rod 1312, and a filter screen 1315 is mounted in the mounting groove.
Furthermore, in order to prevent the self-sealing pressure plate 14 from moving upwards due to the upward reaction force generated by the liquid moving upwards on the self-sealing pressure plate 14 during the water flooding, which affects the accuracy of the experimental result, after the length and the compaction condition of the core are set, the self-sealing pressure plate 14 needs to be fixed; specifically, a fixing nut 1316 is connected to the upper push rod 1311 through a thread, the fixing nut 1316 is located above the top cover 15, the position of the fixing nut 1316 on the upper push rod 1311 is adjusted, and then the fixing nut 1316 is fixed to the top cover, so that the position of the self-sealing pressure plate 14 can be fixed; specifically, a positioning groove 151 is formed in the top cover 15, the diameter of the positioning groove 151 is smaller than the outer diameter of the fixing nut 1316, and threads are formed on the surface of the positioning groove 151; a connecting rod 1317 is fixedly welded to the bottom of the fixing nut 1316, the connecting rod 1317 is of a hollow structure, the upper push rod 1311 can penetrate through the connecting rod 1317, and external threads matched with the threads on the surface of the positioning groove 151 are arranged on the outer surface of the connecting rod 1317; the length of the connecting rod 1317 is the same as the depth of the positioning groove 151, when the fixing nut 1316 is adjusted to be located on the upper push rod 1311, the connecting rod 1317 moves up and down, when the connecting rod 1317 is fixedly connected with the positioning groove 151 in a threaded mode, the bottom of the fixing nut 1316 is just in contact with the top of the top cover 15 to limit the position, and it is guaranteed that the position of the upper press plate 141 cannot be changed. The center of the positioning groove 151 is provided with a center hole 1511 for the push-up rod 1311 to pass through.
Furthermore, the top of the upper push rod 1311 is connected with the collecting device 5 through a third pipeline 8, the collecting device 5 is internally divided into three grids, the upper push rod 1311 on each sand-filled tubule 13 corresponds to one third pipeline 8, then the upper push rod 1311 is connected into one grid in the collecting device 5, and the liquid flowing out of three different sand-filled tubules 13 is collected into different grids of the collecting device 5, so that the liquid flowing out of different sand-filled tubules 13 can be further detected and tested. The bellows is also used to the one end that third pipeline 8 is close to collection device 5, and the homoenergetic is connected with collection device 5 when being in different heights from the sealing clamp plate 14 in the sand filling tubule 13 of being convenient for.
Furthermore, the sand filling tubule 13 is made of transparent material, and the sand filling tubule 13 is provided with scale marks for positioning the height of the lower press plate 142, so that when simulated rock cores with different lengths are tested, the rock cores are filled into the sand filling tubule 13 and are compacted by the self-sealing press plate 14, and the scale marks at the bottom of the lower press plate 142 correspond to the length of the simulated rock cores.
When the oil reservoir engineering simulated sand filling experimental device is used for simulating a water flooding physical experiment, the concrete steps are as follows: connecting a water supply container and an oil supply container with a connecting hole at the bottom of the sand filling pipe through a first pipeline; then the push rod connected with the self-sealing pressure plate and the air pipeline penetrate through the top cover to be assembled with the top cover; calculating the amount of quartz sand required to be filled into different sand filling thin tubes according to the permeability of the core to be simulated and the length of the core to be simulated, filling different amounts of quartz sand into different sand filling thin tubes, mounting a top cover on the sand filling tubes, adjusting the height of a self-sealing pressure plate to align the height of a lower pressure plate with a scale marking corresponding to the length of the core, and then fixing a push rod by using a fixing nut and a connecting rod; connecting the push rod with a collecting device, and connecting an air pipeline with an air pump;
opening an air source, and sequentially inflating the self-sealing chambers in the three sand-filled thin tubes, wherein the inflation pressure is greater than the pressure in the quartz sand; and opening the air pump, injecting oil and water into the oil-water chamber, and closing the air pump after the oil-water mixture fills the oil-water chamber. Then opening an air pump corresponding to the water supply container, injecting water into the oil-water chamber, enabling an oil-water mixture in the oil-water chamber to flow into the quartz sand at the top, continuously injecting water, starting a water flooding experiment, recording the time of liquid entering the collecting device, measuring the liquid amount entering the collecting device, measuring the water content of different liquids in the collecting device, and researching the change condition of the water content along with the time; and when the water content of the liquid entering the collecting device reaches 98%, stopping recording, and comparing the physical rules of the simulated rock cores with different permeabilities in the water flooding experiment.
When sand-packed plugging experiment simulation is carried out, simulated cores with the same permeability and different lengths are loaded in the three sand-packed tubules, other operations are the same as the operations, and the plugging effects of the different core lengths on oil reservoirs are recorded in a comparison mode.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. A simulated sand filling experimental device for oil reservoir engineering comprises a sand filling pipe (1), a water supply container (2), an oil supply container (3), an air source (4) and a collecting device (5); the water supply container (2) and the oil supply container (3) are both connected with one end of the sand filling pipe (1), and the air source (4) and the collecting device (5) are connected with the other end of the sand filling pipe (1); the method is characterized in that: a partition plate (11) is arranged in the sand filling pipe (1), and the partition plate (11) divides the sand filling pipe (1) into an oil-water chamber (12) at the lower part and a sand filling chamber at the upper part; the bottom of the oil water chamber (12) is provided with a connecting hole (121), and the water supply container (2) and the oil supply container (3) are connected with the connecting hole (121) through a first pipeline (6);
the sand filling chamber comprises a plurality of same sand filling thin tubes (13), both ends of each sand filling thin tube (13) are of an open structure, the contact positions of the partition plates (11) and the bottoms of the plurality of sand filling thin tubes (13) are of a net-shaped structure, and the net-shaped structure can only pass oil and water but cannot pass quartz sand; a push rod (131) is arranged in each sand filling thin tube (13), the push rod (131) is of a hollow structure, and a self-sealing pressure plate (14) is fixedly sleeved at the position, close to the bottom, of the push rod (131);
a top cover (15) is arranged at the top of the sand filling chamber, and each push rod (131) penetrates out of the top cover (15) and is connected with the collecting device (5); the air source (4) is connected with the self-sealing pressure plate (14) through a second pipeline (7);
the self-sealing pressure plate (14) comprises an upper pressure plate (141) and a lower pressure plate (142), the outer side surfaces of the upper pressure plate (141) and the lower pressure plate (142) are both in contact with the inner side wall of the sand filling tubule (13), and a self-sealing chamber (143) is formed between the upper pressure plate (141) and the lower pressure plate (142);
first seal grooves (144) are formed in the bottom of the upper pressure plate (141) and the top edge of the lower pressure plate (142), first axial full plug rings (145) are mounted in the first seal grooves (144), and the two first axial full plug rings (145) are oppositely arranged;
the upper pressure plate (141) is provided with a gas through hole (146), the gas through hole (146) is connected with a gas pipeline (147), and the gas pipeline (147) penetrates out of the top cover (15) and is connected with the gas source (4) through a second pipeline (7); a second valve (71) is arranged on the second pipeline (7), and the second valve (71) is positioned outside the sand filling tubule (13);
the push rod (131) comprises an upper push rod (1311) and a lower push rod (1312), the top of the upper push rod (1311) penetrates through the top cover (15) and is connected with the collecting device (5) through a third pipeline (8);
the bottom of the upper push rod (1311) penetrates through the upper pressure plate (141); the upper push rod (1311) is fixedly connected with the upper pressure plate (141);
the top of the lower push rod (1312) is positioned between the upper pressing plate (141) and the lower pressing plate (142), the bottom of the lower push rod (1312) penetrates through the lower pressing plate (142), and the lower push rod (1312) is fixedly connected with the lower pressing plate (142);
the upper push rod (1311) is detachably connected with the lower push rod (1312), and a sealing structure is further arranged at the connection position of the upper push rod (1311) and the lower push rod (1312);
the second pipeline (7) is close to the gas source (4), and the third pipeline (8) is close to the collecting device (5) by adopting corrugated pipes;
the sealing structure comprises a second sealing groove (1313) arranged at the bottom of the upper push rod (1311) or at the top of the lower push rod (1312), and a radial universal plug ring (1314) is arranged in the second sealing groove (1313);
the upper push rod (1311) and the lower push rod (1312) are both external thread rods, and sleeves (16) are connected to the external threads of the upper push rod (1311) and the lower push rod (1312); the periphery of the sleeve (16) is provided with a plurality of fins (161).
2. The reservoir engineering simulation sand-pack experimental device according to claim 1, characterized in that: the bottom of the lower push rod (1312) is provided with a filter screen (1315).
3. The reservoir engineering simulation sand pack experimental device of claim 2, wherein: go up push rod (1311) and go up threaded connection has fixation nut (1316), fixation nut (1316) is located the top of top cap (15), fixation nut (1316) with be equipped with spacing fixing device between top cap (15).
4. The reservoir engineering simulation sand pack experimental device according to claim 3, characterized in that: the limiting fixing device comprises a positioning groove (151) arranged on the top cover (15), and the diameter of the positioning groove (151) is smaller than that of the fixing nut (1316);
the surface of the positioning groove (151) is provided with threads, the bottom of the fixing nut (1316) is fixedly connected with a connecting rod (1317), the connecting rod (1317) is of a hollow structure, and the outer surface of the connecting rod (1317) is provided with external threads matched with the threads on the surface of the positioning groove (151); the center of the positioning groove (151) is provided with a center hole (1511) for the upper push rod (1311) to pass through.
5. The reservoir engineering simulation sand pack experimental device according to claim 4, characterized in that: the sand filling tubule (13) is made of transparent materials, and scale marks for positioning the height of the lower pressing plate (142) are arranged on the sand filling tubule (13).
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| CN115717523A (en) * | 2022-10-20 | 2023-02-28 | 中国石油大学(北京) | Sand filling pipe and reservoir crude oil in-situ oxidation sustainability evaluation experimental device and method |
| CN118010594B (en) * | 2024-04-09 | 2024-06-04 | 山东省地质矿产勘查开发局第二水文地质工程地质大队(山东省鲁北地质工程勘察院) | Device and method for testing mechanical properties of geothermal exploration sampling rock core |
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