CN217632384U - Hydrate reservoir visual gravel packing simulation experiment system - Google Patents
Hydrate reservoir visual gravel packing simulation experiment system Download PDFInfo
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- CN217632384U CN217632384U CN202221071317.0U CN202221071317U CN217632384U CN 217632384 U CN217632384 U CN 217632384U CN 202221071317 U CN202221071317 U CN 202221071317U CN 217632384 U CN217632384 U CN 217632384U
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Abstract
The utility model provides a hydrate reservoir visual gravel packing simulation experiment system, 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 utility model discloses can simulate and develop the gravel packing experiment under the different pit shaft inclination conditions, visual observation gravel migration, pile up, fill the complete flow to and take the damage condition of gravel liquid migration to the hydrate reservoir bed, thereby provide help and guide for the gravel packing sand control technology at scene.
Description
Technical Field
The utility model relates to a gravel packing experiment technical field especially relates to a visual gravel packing simulation experiment system of hydrate reservoir.
Background
The gravel filling sand control is a sand control process for filling gravel, tao Li and other solid-phase particles into a shaft or a 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, the functions of related instruments pay more attention to gravel packing effect evaluation, but less attention to reservoir damage evaluation, local region observation and packing parameter monitoring are adopted in the aspect of observation means, and full-process visual monitoring is adopted less.
SUMMERY OF THE UTILITY MODEL
The utility model provides a visual gravel packing simulation experiment system of hydrate reservoir to be used for solving the technical problem that the gravel packing effect under the current device can't develop different well types, different sieve sleeve combinations, different gravel packing process parameters, the different hydrate stratum circumstances is preferred to be evaluated and is tested.
In order to solve the above problem, the utility model provides a visual gravel packing simulation experiment system of hydrate reservoir, include:
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 at the bottom of the arc cauldron, at the bottom of the arc cauldron with form between the transparent glass window that one end is sealed, 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 connected in sequence, 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 plugging 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 a plurality of 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.
Compared with the prior art, the utility model have apparent advantage and beneficial effect, the concrete aspect that embodies is in following:
1. the solid-liquid supply system is used for pumping gravel carrying liquid with a specific flow and pressure to provide a material technical basis for subsequent simulation of gravel packing 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 packing experiments under different inclination angles, simulation of gravel packing 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 packing pipe column, optimal gravel packing process parameters corresponding to different well types are researched, the reaction kettle main body is made of transparent organic glass, an observation window is reserved in the position of a cross section, gravel migration, a packing process and a stratum damage state in the whole gravel packing process can be monitored visually in real time, and a basis is provided for evaluation of effectiveness and rationality of gravel packing 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 present invention;
FIG. 2 is a schematic sectional view of a reaction vessel in an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a cross section of a reaction kettle in an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a gravel packing string according to an embodiment of the present invention;
FIG. 5 is a schematic cross-sectional structure diagram of an upper pipe column in an embodiment of the present invention;
figure 6 is a cross-sectional view of a screen according to an embodiment of the present 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; 2131-circular hole; 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-laden fluid 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 winch; 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 more comprehensible, embodiments accompanied with figures are described in detail below.
Please refer to fig. 1-6, the embodiment of the present invention provides a simulation experiment system for the visual gravel packing of hydrate reservoir, which includes solid-liquid supply system 1, reaction kettle 2, lifting system 3 and liquid storage tank 4, wherein:
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 stratum damage conditions at different axial positions 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, please refer to and show in fig. 2, 3 among the embodiments of the utility model, reation kettle 2 includes the reation kettle body 21 and the sand-packed tubular column 22 of coaxial setting, and the one end of sand-packed tubular column 22 is suitable for and inserts in the reation kettle body 21, and has annular space 23 between the inner wall of sand-packed tubular column 22 and reation kettle body 21, and the internal face of reation kettle body 21 scribbles simulation stratum filler 5 for the simulation is surveyd the gravel and is filled the damage condition of process to the stratum.
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, please refer 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 covered on the arc kettle bottom 211, an accommodating space with one end closed and the other end opened is formed between the arc kettle bottom 211 and the transparent glass window 212, and the opening upper cover of the accommodating space is provided with a kettle cover 213.
In this embodiment, a transparent glass window 212 is disposed at a section of the reaction kettle body 21 with a radius of 1/2, 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 conditions during the gravel packing process. Preferably, the transparent glass window 212 is made of transparent acrylic glass, and the thickness thereof is 25mm.
Specifically, as shown in fig. 4, 5 and 6, in an embodiment of the present invention, the sand-packed column 22 includes an upper column 221 and a sieve tube 222 coaxially disposed and penetrating through the bottom side of the upper column 221, the wall of the upper column 221 is provided with through liquid return passages 22111 along the axial direction, the sieve tube 222 is provided with a sieve tube inner hole 2221 inside, and the liquid return passages 22111 are communicated with the sieve tube inner hole 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, please refer to fig. 4, 5, and 6, in an embodiment of the present invention, the upper column 221 includes an outer column 2211 and a multi-way tube 2212 coaxially disposed in the outer column 2211, the multi-way tube 2212 is disposed on a side of the outer column 2211 away from the screen 222, a gravel carrying liquid inlet 22121 flush with the opening of the outer column 2211 is disposed at a top end of the multi-way tube 2212, each side end of the multi-way tube 2212 is disposed through a sidewall of the outer column 2211 and has a gravel carrying liquid outlet 22122, the gravel carrying liquid is suitable for entering the upper column 221 from the gravel carrying liquid inlet 22121 of the multi-way tube 2212, and is suitable for flowing out the upper column 221 from the gravel carrying liquid outlet 22122 of the multi-way tube 2212 and entering the annular gap 23 between the autoclave body 21 and the sand-packed column 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 an 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 autoclave body 21 and the sand-packed pipe column 22, so as to return the liquid to 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 reaction 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, please refer to fig. 1, in an 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, 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 packing experiment. The pressure flowmeter 12, the pressure gauge positioned on the reaction kettle body 21 and the corresponding sensor are used as data monitoring systems for monitoring the pressure change condition of the axial direction of the shaft 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, please refer 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 reaction kettle 2 via a rope, and pulleys 34 respectively fixedly connected to two ends of the reaction kettle 2, the hoist 33 is adapted to pull the reaction kettle 2 via the rope, so that the pulleys 34 respectively slide in the horizontal guide rail 31 and the vertical guide rail 32.
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, please refer to fig. 2 and 3, in an embodiment of the present invention, a plurality of sets of liquid returning ports 2111 are uniformly distributed on the arc kettle bottom 211 along the axis 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, be provided with 50 sets of liquid return ports 2111 along axial equidistance on the curved kettle bottom 211, each set of liquid return port 2111 respectively has 3 in the curved kettle bottom 211 radial direction, and the equal radian distributes on the cambered surface of no observation window for discharge unnecessary gravel liquid and installation 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 carrier fluid is returned through the screen openings in the screen 222 to the screen openings 2221 in the screen 222 and discharged through the fluid return passage 22111 in the sand-packed string 22.
The experimental process comprises the following steps: 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 21, and leaving a certain gap with the outer wall of a sand filling pipe column 22 while forming a certain thickness so as to leave gravel filling annulus;
S 2 hydrate synthesis:
installing a 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:
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;
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.
Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Various changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the present disclosure, and these changes and modifications are intended to fall within the scope of the present disclosure.
Claims (9)
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 the lateral wall of reation kettle (2) is linked together, liquid storage pot (4) are used for storing from the gravel liquid is taken in the return in reation kettle (2).
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 arranged on the open upper cover of the containing space.
3. The hydrate reservoir visualization gravel pack simulation experiment system of claim 1, wherein the sand-packing 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 string (221) comprises an outer string (2211) and a tee (2212), the top end of the outer string (2211) is provided with a gravel carrying liquid inlet (22121), the side wall of the outer string is provided with a plurality of symmetrically arranged gravel carrying liquid outlets (22122), and gravel carrying liquid is suitable for entering the upper string (221) from the gravel carrying liquid inlet (22121) and flowing out from the gravel carrying liquid outlets (22122).
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.
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| CN114961665A (en) * | 2022-04-29 | 2022-08-30 | 中国地质大学（武汉） | Hydrate reservoir visual gravel packing simulation experiment system and method |
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