CN114961665A - Hydrate reservoir visual gravel packing simulation experiment system and method - Google Patents
Hydrate reservoir visual gravel packing simulation experiment system and method Download PDFInfo
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- 238000012856 packing Methods 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000004088 simulation Methods 0.000 title claims abstract description 31
- 230000000007 visual effect Effects 0.000 title abstract description 11
- 239000007788 liquid Substances 0.000 claims abstract description 107
- 238000006243 chemical reaction Methods 0.000 claims abstract description 98
- 239000004576 sand Substances 0.000 claims abstract description 37
- 238000002474 experimental method Methods 0.000 claims abstract description 18
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- 238000013508 migration Methods 0.000 claims abstract description 9
- 230000005012 migration Effects 0.000 claims abstract description 9
- 238000009825 accumulation Methods 0.000 claims abstract description 7
- 238000011049 filling Methods 0.000 claims description 50
- 230000015572 biosynthetic process Effects 0.000 claims description 21
- 238000012800 visualization Methods 0.000 claims description 17
- 239000012530 fluid Substances 0.000 claims description 11
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- 238000005086 pumping Methods 0.000 claims description 5
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- 238000005457 optimization Methods 0.000 description 4
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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
- E21B43/02—Subsoil filtering
- E21B43/04—Gravelling of wells
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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
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
- E21B41/0099—Equipment or details not covered by groups E21B15/00 - E21B40/00 specially adapted for drilling for or production of natural hydrate or clathrate gas reservoirs; Drilling through or monitoring of formations containing gas hydrates or clathrates
-
- 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
- E21B43/01—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells specially adapted for obtaining from underwater installations
-
- 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
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Abstract
The invention provides a simulation experiment system and a simulation experiment method for visual gravel packing of a hydrate reservoir, which comprises a solid-liquid supply system, a reaction kettle, a lifting system and a liquid storage tank, wherein the top end of the solid-liquid supply system is connected with the solid-liquid supply system through a pipeline; the reaction kettle is used for simulating gravel packing and stratum damage conditions at different axial positions of a shaft; the reaction kettle is fixed on the lifting system, and the lifting system is suitable for controlling the inclination angle of the reaction kettle so as to carry out gravel packing experiments under different inclination angles; the liquid storage tank is communicated with the side wall of the reaction kettle through the pipeline and is used for storing gravel-carrying liquid returned from the reaction kettle. The invention can simulate and develop gravel packing experiments under different shaft inclination angles, visually observe the whole flow of gravel migration, accumulation and packing and the damage condition of gravel carrying liquid migration to a hydrate reservoir, thereby providing help and guidance for the site gravel packing sand prevention process.
Description
Technical Field
The invention relates to the technical field of gravel packing experiments, in particular to a hydrate reservoir visual gravel packing simulation experiment system and a method thereof.
Background
The gravel filling sand control is a sand control process for filling solid-phase particles such as gravel, ceramic gravel and the like into a shaft or stratum, has the advantages of good sand blocking effect, long validity period and the like, is proved to be an effective sand control method in the traditional oil-gas well completion process, and becomes a mainstream sand control process of loose sandstone oil-gas fields at home and abroad.
The sea area hydrate reservoir of south China Haishushu belongs to an unconsolidated ultrafine powder sand reservoir, but the phase change property of the hydrate and the unconsolidation of the reservoir cause the application of the gravel packing process to have new problems. The concrete aspects are as follows:
on one hand, the gravel is filled to a specific stratum position needing to be protected along with gravel carrying liquid by selecting proper gravel filling process parameters, and certain compactness is achieved, so that the sand prevention effect is achieved; on the other hand, it is also desirable to prevent hydrate breakdown in the formation and even damage to the unconsolidated silt formation during gravel packing due to temperature effects, washout effects, etc. of the gravel-laden fluid.
Due to the fact that construction of the sand prevention process is relatively complex and high in cost, and due to the fact that the experience of gravel packing construction of a hydrate reservoir at the present stage is poor, related researches are in a starting stage at present, and effective experimental means for optimization of parameters of gravel packing process of the hydrate reservoir and evaluation of formation damage in the packing process are poor.
In the current-stage horizontal well gravel packing mechanism research, most devices aim at a conventional oil and gas reservoir and do not relate to a hydrate reservoir, functions of related instruments pay more attention to gravel packing effect evaluation, reservoir damage evaluation is less concerned, local area observation and packing parameter monitoring are more adopted in the aspect of observation means, and full-process visual monitoring is less adopted.
Disclosure of Invention
The invention provides a hydrate reservoir visual gravel packing simulation experiment system and method, which are used for solving the technical problem that the existing device cannot be used for carrying out gravel packing effect optimization evaluation experiments under the conditions of different well types, different screen and sleeve combinations, different gravel packing process parameters and different hydrate formations.
In order to solve the above problems, the present invention provides a hydrate reservoir visualization gravel packing simulation experiment system, which comprises:
a solid-liquid supply system;
the top end of the reaction kettle is connected with the solid-liquid supply system 1 through a pipeline, and the reaction kettle is used for simulating gravel packing and stratum damage conditions at different axial positions of a shaft;
the reaction kettle comprises a reaction kettle body and a sand filling pipe column which are coaxially arranged, one end of the sand filling pipe column is suitable for being inserted into the reaction kettle body, an annular gap is formed between the sand filling pipe column and the inner wall of the reaction kettle body, and simulated formation fillers are coated on the inner wall surface of the reaction kettle body;
the reaction kettle is fixed on the lifting system, and the lifting system is suitable for controlling the inclination angle of the reaction kettle so as to carry out gravel packing experiments under different inclination angles;
and the liquid storage tank is communicated with the side wall of the reaction kettle through the pipeline and is used for storing gravel-carrying liquid returned from the reaction kettle.
Further, the reation kettle cauldron body includes that the bottom of the arc cauldron is established with the lid transparent glass window on the bottom of the arc cauldron, the bottom of the arc cauldron with form one end between the transparent glass window and seal, other end open-ended accommodation space, just accommodation space's opening upper cover is equipped with the kettle cover.
Furthermore, the sand filling pipe column comprises an upper pipe column and a sieve pipe which are coaxially and sequentially connected, one side, close to the sieve pipe, of the upper pipe column is suitable for being inserted into the bottom of the sieve pipe, and the upper pipe column and the sieve pipe are in a blocking state.
Furthermore, the upper pipe column comprises an outer pipe column and a three-way pipe, the top end of the outer pipe column is provided with a gravel liquid carrying inlet, the side wall of the outer pipe column is provided with two symmetrically-arranged gravel liquid carrying outlets, and the gravel liquid carried by the first port of the three-way pipe is suitable for entering the upper pipe column from the gravel liquid carrying inlet and flowing out from the gravel liquid carrying outlet.
Furthermore, the outer circumferential surface of the sieve tube is provided with sieve pores which are uniformly distributed, so that the sieve pores are suitable for filtering redundant gravel-carrying liquid between the reaction kettle body and the sand-filled pipe column, and the liquid enters the sieve tube.
Furthermore, a round hole is formed in the center of the kettle cover, and one end of the sand filling pipe column is suitable for being inserted into the reaction kettle body through the round hole.
Further, the solid-liquid supply system comprises a pump, a pressure flowmeter and a stirring device which are sequentially connected through pipelines, and the pump is suitable for pumping the pre-mixed gravel carrying liquid in the stirring device into the reaction kettle for gravel filling experiments.
Furthermore, the hoisting system comprises a horizontal guide rail, a vertical guide rail vertically connected with one end of the horizontal guide rail, a winch and pulleys fixedly connected with two ends of the reaction kettle, and the winch is suitable for driving the pulleys of the reaction kettle to slide in the horizontal guide rail and the vertical guide rail respectively.
Furthermore, a plurality of groups of liquid return ports are uniformly distributed on the arc-shaped kettle bottom along the axis direction, and the plurality of groups of liquid return ports are connected with the liquid storage tank through pipelines.
The invention also provides a simulation experiment method for the visual gravel packing of the hydrate reservoir, and the simulation experiment system for the visual gravel packing of the hydrate reservoir comprises the following steps:
S 1 sample filling:
uniformly mixing the framework material with a certain amount of THF solution and cementing agent, uniformly coating the mixture on the inner wall of a reaction kettle body, and leaving a certain gap with the outer wall of a sand filling pipe column to leave a gravel filling annulus while forming a certain thickness;
S 2 hydrate synthesis:
installing the sand filling pipe column and closing the reaction kettle, reducing the environmental temperature, and synthesizing THF hydrate to obtain a simulated formation filler;
S 3 pipeline connection and inclination angle setting:
connecting a solid-liquid supply system with the reaction kettle through a pipeline, connecting a required pressure sensor, and adjusting the inclination angle of the reaction kettle through a lifting system;
S 4 mixing gravel carrying liquid:
adding gravel and medium fluid into the solid-liquid supply system in advance, and uniformly stirring for later use;
S 5 gravel pack experiments:
setting filling parameters of the solid-liquid supply system, the reaction kettle and the lifting system, pumping gravel carrying liquid into the reaction kettle, filling gravel carrying liquid into a filling annular space between the reaction kettle body and the sand filling pipe column through the sand filling pipe column, returning redundant gravel carrying liquid into a liquid storage tank through a peripheral liquid return port of the reaction kettle and an internal channel of the sand filling pipe column, and continuously shooting gravel migration accumulation and stratum damage images in the reaction kettle.
Compared with the prior art, the invention has obvious advantages and beneficial effects, which are embodied in the following aspects:
1. the solid-liquid supply system is used for manufacturing synthetic hydrate, a material technical basis is provided for subsequent simulation of gravel filling and stratum damage conditions of a shaft of the reaction kettle 2, the lifting system 3 controls the inclination angle of the reaction kettle 2 to perform gravel filling experiments at different inclination angles, simulation of gravel filling evaluation experiments of different well types is achieved by adjusting the axial inclination angle of the reaction kettle and the offset degree of an internal sand filling pipe column, optimal gravel filling process parameters corresponding to different well types are researched, an observation window is reserved in the cross section position of the reaction kettle main body made of transparent organic glass, gravel migration, a stacking process and a stratum damage state in the whole gravel filling process can be monitored visually in real time, and a basis is provided for evaluation of effectiveness and reasonability of gravel filling process parameters.
2. By replacing the channel section and the screen section fittings of the sand filling pipe column, gravel filling effect evaluation and process parameter optimization experiments under different screen pipe forms and size combinations are carried out, and experimental support can be provided for design optimization of the sand filling pipe column.
3. By replacing the framework material and the hydrate synthetic matrix of the simulated formation, the approximate simulation of different types of hydrate reservoirs can be realized, and the method is used for developing gravel packing experiments aiming at different hydrate reservoirs and preferably selecting corresponding packing process parameters.
Drawings
FIG. 1 is a schematic structural diagram of a hydrate reservoir visualization gravel packing simulation experiment system in an embodiment of the invention;
FIG. 2 is a schematic sectional view of a reaction vessel in an example of the present invention;
FIG. 3 is a schematic structural view of a cross section of a reaction vessel in an example of the present invention;
FIG. 4 is a schematic illustration of a gravel packing string according to an embodiment of the present invention;
FIG. 5 is a schematic cross-sectional view of an upper tubular string in an embodiment of the present invention;
FIG. 6 is a schematic cross-sectional view of a screen according to an embodiment of the present invention;
fig. 7 is a detailed flow diagram of a simulation experiment method for visualization gravel packing of a hydrate reservoir in an embodiment of the invention.
Reference numerals:
1-a solid-liquid supply system;
11-a pump; 12-a pressure flow meter; 13-a stirring device; 14-a pipeline;
2-a reaction kettle;
21-a reaction kettle body; 211-arc kettle bottom; 2111-a fluid return port; 212-transparent glazing; 213-kettle cover; 22-a sand-packed string; 221-loading the tubular column; 2211-outer tubing string; 22111-liquid return channel; 2212-multiway tubes; 22121-a gravel-carrying liquid inlet; 22122-a gravel-carrying liquid outlet; 222-a screen; 2221-screen pipe inner hole; 23-an annular gap;
3, lifting the system;
31-horizontal guide rail; 32-vertical guide rails; 33-a hoist; 34-a pulley;
4-a liquid storage tank; 5-simulation of the formation packing.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Referring to fig. 1 to 6, an embodiment of the present invention provides a simulation experiment system for visualized gravel packing of a hydrate reservoir, including a solid-liquid supply system 1, a reaction kettle 2, a hoisting system 3, and a liquid storage tank 4, where:
the solid-liquid supply system 1 is used for manufacturing a synthetic hydrate, and provides a material technical basis for simulating gravel filling and formation damage conditions of a shaft of a subsequent reaction kettle 2;
the top end of the reaction kettle 2 is connected with the solid-liquid supply system 1 through a pipeline and is used for simulating gravel packing and formation damage conditions at different positions in the axial direction of a shaft;
the reaction kettle 2 is fixed on the lifting system 3, and the lifting system 3 is suitable for controlling the inclination angle of the reaction kettle 2 so as to carry out gravel packing experiments under different inclination angles;
the liquid storage tank 4 is communicated with the side wall of the reaction kettle 2 through a pipeline and is used for storing gravel-carrying liquid returned from the reaction kettle 2.
Therefore, the hydrate reservoir visual gravel packing simulation experiment system which can be used in a laboratory is designed for evaluating the packing process and the stratum damage state of the hydrate reservoir gravel, and can simulate and develop gravel packing effect optimization evaluation experiments under the conditions of different well types, different screen sleeve combinations, different gravel packing process parameters and different hydrate strata, and provide visual image results to describe gravel migration, accumulation and packing processes and the stratum damage state, so that help and guidance are provided for the on-site gravel packing sand prevention process.
Specifically, as shown in fig. 2 and 3, in the embodiment of the present invention, the reaction kettle 2 includes a reaction kettle body 21 and a sand-packed pipe column 22, which are coaxially disposed, one end of the sand-packed pipe column 22 is adapted to be inserted into the reaction kettle body 21, an annular gap 23 is provided between the sand-packed pipe column 22 and an inner wall of the reaction kettle body 21, and an inner wall surface of the reaction kettle body 21 is coated with a simulated formation filler 5 for simulating and observing a damage condition of a gravel packing process to a formation.
It should be noted that, in order to simulate the erosion effect on the formation during the gravel packing process, the simulated formation filler 5 made of materials such as clay can be used on the inner wall of the reaction kettle body 21, so as to realize the visualization of the formation damage during the packing process.
In this embodiment, optionally, the outer diameter of the sand-packed string 22 is 68mm, the wall thickness is 10mm, the length of a single section is 1m, and the upper section and the lower section are connected by threads; the inner diameter of the reaction kettle body 21 is 80mm, the wall thickness is 25mm, and the reaction kettle body is made of transparent acrylic glass.
Specifically, referring to fig. 2 and 3, in the embodiment of the present invention, the reaction kettle body 21 includes an arc kettle bottom 211 and a transparent glass window 212 covering the arc kettle bottom 211, an accommodating space with one end closed and the other end open is formed between the arc kettle bottom 211 and the transparent glass window 212, and a kettle cover 213 is disposed on an upper cover of the accommodating space.
In this embodiment, the transparent glass window 212 is disposed at the section of the radius 1/2 of the reaction kettle body 21, and the transparent glass window 212 penetrates through the entire reaction kettle body 21 along the axial direction, so as to be used for observing the gravel migration and accumulation during the gravel packing process. Preferably, the transparent glass window 212 is made of transparent acrylic glass, and the thickness thereof is 25 mm.
Specifically, referring to fig. 4 and 5, in the embodiment of the present invention, the sand-packed string 22 includes an upper string 221 and a screen tube 222 coaxially disposed and penetrating the bottom side of the upper string 221, liquid-returning passages 22111 are disposed on the tube wall of the upper string 221 along the axial direction, screen tube inner holes 2221 are disposed inside the screen tube 222, and the liquid-returning passages 22111 are communicated with the screen tube inner holes 2221. Additionally, the screen 222 may be a composite screen, a bypass screen, or a screen of a different type.
Therefore, the screen section at the lower part of the sand-packed string 22 is connected by screw threads, so that the screen section is convenient to replace, and the screen 222 is convenient to carry gravel liquid to move in the annular space.
Specifically, referring to fig. 4, 5 and 6, in an embodiment of the present invention, the upper string 221 includes an outer string 2211 and a multi-way tube 2212 coaxially disposed in the outer string 2211, the multi-way tube 2212 is disposed on a side of the outer string 2211 away from the screen 222, a top end of the multi-way tube 2212 has a gravel carrying liquid inlet 22121 flush with an opening of the outer string 2211, each side end of the multi-way tube 2212 penetrates a side wall of the outer string 2211 and has a gravel carrying liquid outlet 22122, and the gravel carrying liquid is adapted to enter the upper string 221 from the gravel carrying liquid inlet 22121 of the multi-way tube 2212 and flow out of the upper string 221 from the gravel carrying liquid outlet 22122 of the multi-way tube 2212 and enter the annular gap 23 between the reaction kettle body 21 and the sand-packed string 22.
Thus, the upper pipe column 221 is provided with a gravel-carrying liquid inlet 22121, a gravel-carrying liquid outlet 22122 and a liquid return passage 22111, and the lower end thereof is connected with the screen inner hole 2221 of the screen 222. The upper tubular string 221 and the screen 222 together form a transport path for gravel-laden fluid during gravel packing operations, which flows out of the gravel-laden fluid outlet 22122 and into the annular space 23.
Specifically, referring to fig. 4, 5 and 6, in the embodiment of the present invention, the outer circumferential surface of the sieve tube 222 is provided with uniformly distributed sieve holes to filter the redundant gravel-carrying liquid between the reaction kettle body 21 and the sand-packed pipe column 22, so as to return the liquid into the sieve tube 222.
Specifically, referring to fig. 2, in the embodiment of the present invention, a circular hole 2131 is formed in the center of the kettle cover 213, and one end of the sand-packed column 22 is adapted to be inserted into the kettle body 21 through the circular hole 2131.
Thus, the sand-packed string 22 is inserted into the reaction vessel 2 through the vessel cover 213, thereby realizing a simulated gravel packing process.
Specifically, referring to fig. 1, in the embodiment of the present invention, the solid-liquid supply system 1 includes a pump 11, a pressure flow meter 12 and a stirring device 13 connected in sequence by a pipeline 14, and the pump 11 is adapted to pump gravel-carrying liquid pre-mixed in the stirring device 13 into the reaction tank 2 for gravel packing experiments. The pressure flowmeter 12, the pressure gauge positioned on the reaction kettle body 21 and corresponding sensors are used as data monitoring systems for monitoring the pressure change condition of the axial direction of the well bore in the gravel packing process.
Thus, in the present embodiment, the solid-liquid supply system 1 includes the pump 11, the pressure flow meter 12, the stirring device 13, and the piping 14. Wherein the gravel-carrying fluid is pre-mixed in the mixing device 13 and subsequently pumped by the pump 11 at a flow rate to the sand packing string 22, and the pressure flow meter 12 is used to monitor pressure and flow parameters inside the pipeline at the gravel-carrying fluid inlet 22121.
Specifically, referring to fig. 1, in an embodiment of the present invention, the hoisting system 3 includes a horizontal guide rail 31, a vertical guide rail 32 vertically connected to one end of the horizontal guide rail 31, a hoist 33 fixedly connected to one end of the reactor 2 by a rope, and pulleys 34 fixedly connected to two ends of the reactor 2, respectively, where the hoist 33 is adapted to pull the reactor 2 by a rope, so that the pulleys 34 slide in the horizontal guide rail 31 and the vertical guide rail 32, respectively.
Therefore, in the embodiment, the lifting system 3 is a right-angled support for placing the reaction kettle 2, the lifting system 3 can change the inclination angle position of the reaction kettle 2 to simulate different well directions, and the inclination angle adjusting range of the reaction kettle 2 is 0-90 degrees.
Specifically, referring to fig. 2 and 3, in the embodiment of the present invention, a plurality of sets of liquid returning ports 2111 are uniformly distributed on the arc-shaped kettle bottom 211 along the axial direction, and the plurality of sets of liquid returning ports 2111 are connected to the liquid storage tank 4 through a pipeline.
In this embodiment, the liquid return ports 2111 are arranged along a plurality of sets of the axial direction of the arc kettle bottom 211, and are connected with the liquid storage tank 4 through the pipeline 14, the arrangement density of the liquid return ports 2111 is 15 sets/m, and 3 liquid return ports are uniformly distributed along the circumferential direction of the arc kettle bottom 211 in each set.
In this embodiment, the arc-shaped kettle bottom 211 is provided with 50 sets of liquid return ports 2111 at equal intervals along the axial direction, each set of liquid return ports 2111 has 3 in the radial direction of the arc-shaped kettle bottom 211, and the liquid return ports are distributed in an equal radian on the arc surface without the observation window, so as to discharge redundant gravel-carrying liquid and install a pressure sensor.
The liquid return ports 2111 may be provided in plural numbers as needed, and may be provided at arbitrary positions.
Thus, when gravel is packed, excess gravel-laden fluid returns through the screen openings in the screen 222 to the screen inner holes 2221 of the screen 222 and is discharged through the fluid return passage 22111 in the sand-packed string 22.
As shown in fig. 7, an embodiment of the present invention further provides a hydrate reservoir visualization gravel packing simulation experiment method, where the hydrate reservoir visualization gravel packing simulation experiment system is adopted, and the method includes the following steps:
S 1 sample filling:
uniformly mixing the framework material with a certain amount of THF solution and cementing agent, uniformly coating the mixture on the inner wall of a reaction kettle body 21, and forming a certain thickness while leaving a certain gap with the outer wall of a sand filling pipe column 22 to leave gravel filling annulus;
S 2 hydrate synthesis:
installing a sand filling pipe column 22 and sealing the reaction kettle 2, reducing the environmental temperature, and synthesizing THF hydrate to obtain a simulated formation filler 5;
S 3 pipeline connection and inclination angle setting:
the solid-liquid supply system 1 is connected with the reaction kettle 2 through a pipeline, a required pressure sensor is connected, and the inclination angle of the reaction kettle 2 is adjusted through the lifting system 3;
S 4 mixing gravel carrying liquid:
gravel and medium fluid are added into the solid-liquid supply system 1 in advance and are uniformly stirred for standby application;
S 5 gravel pack experiments:
setting filling parameters of the solid-liquid supply system 1, the reaction kettle 2 and the lifting system 3, pumping gravel carrying liquid into the reaction kettle 2, enabling the gravel carrying liquid to enter a filling annular space between the reaction kettle body 21 and the sand filling pipe column 22 through the sand filling pipe column 22 for filling, returning redundant gravel carrying liquid to the liquid storage tank 4 through a peripheral liquid return port of the reaction kettle 2 and an internal channel of the sand filling pipe column 22, and continuously shooting gravel migration accumulation and stratum damage images in the reaction kettle 2.
Therefore, the hydrate reservoir visual gravel packing simulation experiment method can perform gravel packing and stratum damage evaluation experiments aiming at different well types, different screen sleeve combinations, different gravel packing process parameters and different hydrate stratum conditions, has the function of observing the flow state and stratum damage state of the whole well section gravel packing process, is beneficial to disclosing the migration, accumulation and filling processes and rules of flowing solids in the gravel packing process and evaluating the stratum damage state under the corresponding packing parameters, and is beneficial to optimizing the gravel packing process parameters of a production site.
Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the spirit and scope of the present disclosure, and these changes and modifications are intended to be within the scope of the present disclosure.
Claims (10)
1. A hydrate reservoir visualization gravel packing simulation experiment system is characterized by comprising:
a solid-liquid supply system (1);
the top end of the reaction kettle (2) is connected with the solid-liquid supply system 1 through a pipeline, and the reaction kettle (2) is used for simulating gravel packing and stratum damage conditions at different positions in the axial direction of a shaft;
the reaction kettle (2) comprises a reaction kettle body (21) and a sand filling pipe column (22) which are coaxially arranged, one end of the sand filling pipe column (22) is suitable for being inserted into the reaction kettle body (21), an annular gap (23) is formed between the sand filling pipe column (22) and the inner wall of the reaction kettle body (21), and simulated formation fillers (5) are coated on the inner wall surface of the reaction kettle body (21);
the reaction kettle (2) is fixed on the hoisting system (3), and the hoisting system (3) is suitable for controlling the inclination angle of the reaction kettle (2) so as to carry out gravel packing experiments at different inclination angles;
liquid storage pot (4), liquid storage pot (4) pass through the pipeline with reation kettle (2) lateral wall is linked together, liquid storage pot (4) are used for storing certainly return in reation kettle (2) carry the gravel liquid.
2. The hydrate reservoir visualization gravel pack simulation experiment system of claim 1, wherein the reaction kettle body (21) comprises an arc kettle bottom (211) and a transparent glass window (212) covered on the arc kettle bottom (211), a containing space with one closed end and the other open end is formed between the arc kettle bottom (211) and the transparent glass window (212), and a kettle cover (213) is covered on the opening of the containing space.
3. The hydrate reservoir visualization gravel pack simulation experiment system of claim 1, wherein the sand-filling string (22) comprises an upper string (221) and a screen (222) which are coaxially connected in sequence, one side of the upper string (221) close to the screen (222) is suitable for being inserted into the bottom of the screen (222), and the upper string (221) and the screen (222) are in a blocking state.
4. The hydrate reservoir visualization gravel pack simulation experiment system of claim 3, wherein the upper pipe column (221) comprises an outer pipe column (2211) and a tee (2212), the top end of the outer pipe column (2211) is provided with a gravel carrying liquid inlet (2211), the side wall of the outer pipe column (2211) is provided with two symmetrically arranged gravel carrying liquid outlets (2212), and the gravel carrying liquid at the first port of the tee (2212) is suitable for entering the upper pipe column (221) from the gravel carrying liquid inlet (2211) and flowing out from the gravel carrying liquid outlet (2212).
5. The hydrate reservoir visualization gravel pack simulation experiment system of claim 3, wherein the outer circumferential surface of the sieve tube (222) is provided with evenly distributed sieve holes to be suitable for filtering excessive gravel-carrying liquid between the reaction kettle body (21) and the sand-filling pipe column (22) so as to enable the liquid to enter the sieve tube (222).
6. The hydrate reservoir visualization gravel pack simulation experiment system of claim 2, wherein a circular hole (2131) is formed in the center of the kettle cover (213), and one end of the sand-packed tubing string (22) is suitable for being inserted into the reaction kettle body (21) through the circular hole (2131).
7. The hydrate reservoir visualization gravel pack simulation experiment system according to claim 1, wherein the solid-liquid supply system (1) comprises a pump (11), a pressure flow meter (12) and a stirring device (13) which are sequentially connected through a pipeline (14), and the pump (11) is suitable for pumping the pre-mixed gravel carrying liquid in the stirring device (13) into the reaction kettle (2) for gravel pack experiment.
8. The hydrate reservoir visualization gravel pack simulation experiment system of claim 1, wherein the hoisting system (3) comprises a horizontal guide rail (31), a vertical guide rail (32) vertically connected with one end of the horizontal guide rail (31), a winch (33) and pulleys (34) fixedly connected with two ends of the reaction kettle (2), and the winch (33) is suitable for driving the pulleys (34) of the reaction kettle (2) to slide in the horizontal guide rail (31) and the vertical guide rail (32) respectively.
9. The hydrate reservoir visualization gravel pack simulation experiment system according to claim 2, wherein a plurality of groups of liquid return ports (2111) are uniformly distributed on the arc-shaped kettle bottom (211) along the axis direction, and the plurality of groups of liquid return ports (2111) are connected with the liquid storage tank (4) through pipelines.
10. A hydrate reservoir visualization gravel packing simulation experiment method, which adopts the hydrate reservoir visualization gravel packing simulation experiment system of any one of claims 1 to 9, and is characterized by comprising the following steps:
S 1 sample filling:
uniformly mixing the framework material with a certain amount of THF solution and cementing agent, uniformly coating the mixture on the inner wall of a reaction kettle body (21), and forming a certain thickness while leaving a certain gap with the outer wall of a sand filling pipe column (22) to leave a gravel filling annulus;
S 2 hydrate synthesis:
installing the sand filling pipe column (22) and closing the reaction kettle (2), reducing the environmental temperature, and synthesizing THF hydrate to obtain a simulated formation filler (5);
S 3 pipeline connection and inclination angle setting:
connecting a solid-liquid supply system (1) with the reaction kettle (2) through a pipeline, connecting a required pressure sensor, and adjusting the inclination angle of the reaction kettle (2) through a lifting system (3);
S 4 mixing gravel carrying liquid:
gravel and medium fluid are added into the solid-liquid supply system (1) in advance and are uniformly stirred for standby application;
S 5 gravel pack experiments:
setting the filling parameters of the solid-liquid supply system (1), the reaction kettle (2) and the lifting system (3), pumping gravel liquid into the reaction kettle (2), making gravel liquid enter the reaction kettle body (21) and the filling ring between the sand filling pipe columns (22) for filling, and continuously shooting gravel migration accumulation and stratum damage images in the reaction kettle (2) by redundant gravel liquid through the liquid return ports around the reaction kettle (2) and the internal channels of the sand filling pipe columns (22) for returning to the liquid storage tank (4).
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