CN116256239B - Visual device and method for testing pressure bearing performance of plugging band considering fluid loss - Google Patents
Visual device and method for testing pressure bearing performance of plugging band considering fluid loss Download PDFInfo
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- CN116256239B CN116256239B CN202310546276.9A CN202310546276A CN116256239B CN 116256239 B CN116256239 B CN 116256239B CN 202310546276 A CN202310546276 A CN 202310546276A CN 116256239 B CN116256239 B CN 116256239B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
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- G01N3/068—Special adaptations of indicating or recording means with optical indicating or recording means
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Abstract
The invention discloses a visual device and a visual method for testing pressure-bearing performance of a plugging zone considering fluid loss, and relates to the field of petroleum and natural gas exploration and development, comprising a test box, wherein two sides of the test box are respectively provided with a liquid inlet pipeline and a liquid outlet pipeline; the other end of the liquid inlet pipeline is connected with the stirring kettle; the stirring kettle is connected with one end of the intermediate container; the other end of the intermediate container is connected with a liquid pump, and drilling fluid is arranged in the intermediate container; a first pressure sensor is arranged on the liquid inlet pipeline; the liquid outlet pipeline is provided with a first valve. According to the invention, the preparation function of the plugging belt is combined with the pressure-bearing capacity test of the plugging belt, and the problem that the pressure-bearing capacity test of the plugging belt under the condition of fluid loss cannot be simulated due to inaccurate pressure-bearing capacity measurement caused by the fact that the plugging belt is required to be transferred by the conventional plugging belt pressure-bearing capacity test device is solved on the basis of realizing the visualization of the test process.
Description
Technical Field
The invention relates to the field of petroleum and natural gas exploration and development, in particular to a plugging belt pressure-bearing performance test visualization device and method considering fluid loss.
Background
Drilling fluid is a circulating flushing medium used in holes in the drilling process in the fields of oil and natural gas. In the well drilling construction, the drilling fluid is usually lost to the peripheral wall surface of the well and the crack joint surface communicated with the well shaft, and a filter cake is formed, so that the stability of the well wall is improved, and on the other hand, in order to prevent or timely control the leakage of the drilling fluid, on-site personnel can add solid-phase particle plugging agents into the drilling fluid to prepare the plugging slurry. In the whole drilling operation process, solid-phase particles in the working solution are accumulated on the surface of a crack, filtrate is lost into a stratum, when the drilling slurry contains particles with different sizes, larger particles in the slurry form a filter cake skeleton, and the smallest particles can migrate and deposit in a porous filter cake formed by the larger particles to form a plugging band for leakage of the crack drilling solution. Therefore, how to simulate the performance measurement of the plugging zone of the actual stratum drilling fluid wall surface filtration process in the room and realize the visualization. Has important significance for evaluating the plugging effect of the drilling fluid and the plugging slurry, clearly considering the formation mechanism of the plugging zone under the fluid loss effect and solving the difficult problem of lost circulation. However, the current plugging band performance measuring device still has several problems:
1. the method can not simulate the fluid loss process in underground real stratum cracks and adjust the wall fluid loss performance, and the wall fluid loss directly influences the sedimentation speed of solid phase particles, so that a plugging zone is formed and has larger deviation from the real working condition;
2. the visualization can not be realized, the lack of a visualization process in the conventional fluid loss measurement device experiment can not intuitively judge whether the plugging band is formed, inconvenience is brought to the subsequent experiment, and meanwhile, the forming process of the plugging band can not be intuitively observed, so that the research on the microscopic plugging mechanism of solid-phase particles is not facilitated;
3. the real flushing direction of fluid and a seam surface in a real crack cannot be simulated, the liquid flow direction of a conventional fluid loss measurement device is parallel to the solid-phase particle deposition direction, and the two directions are in a mutually perpendicular relation in the actual situation;
4. the combination of the plugging band preparation function and the plugging band pressure bearing capability test under the fluid loss condition cannot be realized.
Disclosure of Invention
Aiming at the defects in the prior art, the device and the method for testing and visualizing the pressure-bearing performance of the plugging zone taking the fluid loss into consideration solve the problems that the conventional plugging zone performance measuring device cannot simulate the fluid loss process in the underground real stratum fracture and adjust the wall fluid loss performance, and cannot realize visualization.
In order to achieve the aim of the invention, the invention adopts the following technical scheme:
the visual device for testing the pressure-bearing performance of the plugging band considering the fluid loss comprises a testing box, wherein two sides of the testing box are respectively provided with a liquid inlet pipeline and a liquid outlet pipeline; the other end of the liquid inlet pipeline is connected with the stirring kettle; the stirring kettle is connected with one end of the intermediate container; the other end of the intermediate container is connected with a liquid pump, and drilling fluid is arranged in the intermediate container; a first pressure sensor is arranged on the liquid inlet pipeline; the liquid outlet pipeline is provided with a first valve;
the test box comprises a backboard; the other five surfaces of the backboard are provided with baffle plates and are enclosed into a box body; two rows of second partition boards are transversely arranged on the backboard; an upper filter plate and a lower filter plate are arranged between the two rows of second partition plates, and test cracks are formed between the upper filter plate and the lower filter plate; the back plate, the upper filter plate, the lower filter plate, the second partition plate and the baffle plate enclose a plurality of independent fluid loss chambers; each fluid loss cavity is connected with a second valve and a second pressure sensor;
the baffle plate positioned at the front end of the backboard comprises an upper light shielding plate, a light transmitting plate and a lower light shielding plate which are sequentially arranged from top to bottom; the position of the backboard corresponding to the test crack is made of a light-transmitting material, and the rear end of the backboard is provided with a light source; the front end of the test box is provided with a light shield, and a camera aligned with the test crack is arranged in the light shield.
The method for testing the pressure-bearing performance of the plugging belt comprises the following steps:
s1, enclosing a back plate, an upper filter plate, a lower filter plate, a second partition plate and a baffle plate into a plurality of independent fluid loss chambers, and connecting each fluid loss chamber with a second valve and a second pressure sensor to form a test box;
s2, a first pressure sensor is arranged on a liquid inlet pipeline of the test box, and a first valve is arranged on a liquid outlet pipeline of the test box; a light shield is arranged at the front end of the test box, and a camera aligned with the test crack is placed;
s3, presetting and stirring a plugging material and drilling fluid in a stirring kettle; presetting drilling fluid in an intermediate container; connecting the test box, the stirring kettle, the intermediate container and the liquid pump; starting a light source at the rear end of the backboard;
s4, opening the first valve and the second valve, pressing the intermediate container through the liquid pump, enabling the drilling fluid in the intermediate container to enter the stirring kettle, and enabling the mixed fluid in the stirring kettle to enter the test box; adjusting the pressure of the liquid pump to enable the data of the first pressure sensor to be stable at a set value;
s5, continuously acquiring image data of a camera, and counting the filtration loss through a first valve and a second valve;
s6, judging whether a plugging band is formed in the test crack according to the image data of the camera, and if so, entering a step S8; otherwise, entering step S7;
s7, judging whether the pressing time of the liquid pump reaches the set time, if so, judging that the plugging belt fails to form, and ending the test; otherwise, returning to the step S5;
s8, closing the second valves to obtain pressure data of each second pressure sensor; acquiring position data of the plugging band through image data of a camera;
s9, testing the pressure bearing performance of the plugging belt: increasing the pressure of a liquid pump, recording the pressure data of the first pressure sensor until the pressure bearing of the plugging belt fails, and taking the maximum pressure data of the first pressure sensor as the maximum pressure bearing capacity of the plugging belt; and acquiring image data of the pressure bearing performance test of the plugging belt.
The beneficial effects of the invention are as follows:
1. according to the invention, the light source and the camera are used for shooting the test cracks, whether the plugging band is formed or not can be judged through the light transmittance, and the forming process of the plugging band is recorded; the failure process of bearing pressure of the plugging belt can be recorded, and the research of solid-phase particle microscopic plugging mechanism is facilitated.
2. The invention can simulate the formation and pressure bearing of the plugging band under the action of the fluid loss, and obtain the fluid loss process and the wall fluid loss performance which are closer to those of underground real stratum cracks. Has important significance for evaluating the plugging effect of the drilling fluid and the plugging slurry, clearly considering the formation mechanism of the plugging zone under the fluid loss effect and solving the difficult problem of lost circulation.
3. The opening adjusting component can simulate different wall fluid loss properties, adjust the fluid loss coefficients of different fluid loss chambers, and is convenient for simulating different underground environments without specially manufacturing a rock plate.
4. The opening adjusting component can provide support for the test crack under the condition of complete closing, and avoids the influence of drilling fluid entering the fluid loss cavity to the plugging belt pressure test in the plugging belt pressure test process.
5. The intermediate container is isolated through the first partition board, so that the using amount of drilling fluid can be reduced, and the drilling fluid can be prevented from being diluted by water.
Drawings
FIG. 1 is a block diagram of the present apparatus;
FIG. 2 is a schematic diagram of the overall structure of the test box;
FIG. 3 is a schematic diagram of an exploded construction of the test case;
fig. 4 is a schematic structural view of the opening degree adjusting member;
fig. 5 is a top view of the first opening control plate;
fig. 6 is a bottom view of the second opening control plate.
Wherein: 1. a test box; 2. stirring kettle; 3. an intermediate container; 4. a liquid pump; 5. a first separator; 6. a liquid inlet pipe; 7. a first pressure sensor; 8. a liquid outlet pipe; 9. a first valve; 10. a light shield; 11. a back plate; 12. a second valve; 13. a second pressure sensor; 14. a second separator; 15. an upper filter plate; 16. a fluid loss chamber; 17. a lower filter plate; 18. a limiting table; 19. a first sealing rubber strip; 20. a baffle; 21. an upper light shielding plate; 22. a light-transmitting plate; 23. a lower light shielding plate; 24. a first opening control board; 25. a second opening control board; 26. a flow port; 27. universal ball head; 28. a threaded rod; 29. a wheel disc; 31. a convex-shaped groove body; 32. an opening; 33. the convex-shaped limiter.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and all the inventions which make use of the inventive concept are protected by the spirit and scope of the present invention as defined and defined in the appended claims to those skilled in the art.
As shown in fig. 1, 2 and 3, the visual device for testing the pressure-bearing performance of the plugging zone considering the fluid loss comprises a test box 1, wherein two sides of the test box 1 are respectively provided with a liquid inlet pipeline 6 and a liquid outlet pipeline 8; the other end of the liquid inlet pipeline 6 is connected with the stirring kettle 2; the stirring kettle 2 is connected with one end of the intermediate container 3; the other end of the intermediate container 3 is connected with a liquid pump 4, and drilling fluid is arranged in the intermediate container 3; the liquid inlet pipeline 6 is provided with a first pressure sensor 7; the liquid outlet pipeline 8 is provided with a first valve 9;
the test box 1 comprises a back plate 11; the other five surfaces of the back plate 11 are provided with baffle plates 20 and are enclosed into a box body; two rows of second partition plates 14 are transversely arranged on the back plate 11; an upper filter plate 15 and a lower filter plate 17 are arranged between the two rows of second partition plates 14, and test cracks are formed between the upper filter plate 15 and the lower filter plate 17; the back plate 11, the upper filter plate 15, the lower filter plate 17, the second partition plate 14 and the baffle plate 20 enclose a plurality of independent fluid loss chambers 16; each fluid loss chamber 16 is connected with a second valve 12 and a second pressure sensor 13;
the baffle 20 at the front end of the backboard 11 comprises an upper light shielding plate 21, a light transmitting plate 22 and a lower light shielding plate 23 which are sequentially arranged from top to bottom; the position of the backboard 11 corresponding to the test crack is made of a light-transmitting material, and the rear end of the backboard 11 is provided with a light source; the front end of the test box 1 is provided with a light shield 10, and a camera aiming at the test crack is arranged in the light shield 10.
A first baffle plate 5 capable of sliding is arranged in the middle container 3, and the first baffle plate 5 is divided into two accommodating spaces; the drilling fluid is arranged in the accommodating space connected with the stirring kettle 2; the liquid pump 4 is connected to the other receiving space.
The back plate 11 is provided with a stopper 18 for supporting the upper filter plate 15. The edges of the second partition 14 are each provided with a first bead 19 for sealing.
An opening degree adjusting part is arranged in at least one fluid loss chamber 16; as shown in fig. 4, 5 and 6, the opening degree adjusting means includes a first opening degree control plate 24 and a second opening degree control plate 25; the first opening control plate 24 and the second opening control plate 25 are provided with a circulation port 26;
the first opening control plate 24 is fixed with the back plate 11 and the corresponding second partition plate 14 respectively and is arranged at one end close to the test crack; the first opening control plate 24 is provided with a convex groove 31; the convex groove 31 is provided with an opening 32;
the second opening control plate 25 is provided with a convex limiter 33 matched with the convex groove 31 and the opening 32; the rear end of the second opening control plate 25 is connected with one end of a threaded rod 28 through a universal ball head 27; the other end of the threaded rod 28 passes out of the back plate 11 and is provided with a wheel disc 29; the threaded rod 28 is in threaded connection with the back plate 11;
the opening value of the opening adjusting member is controlled by the overlapping amount of the flow ports 26 on the first opening control plate 24 and the second opening control plate 25. A second sealing strip is arranged around the circulation port 26.
The plugging belt pressure bearing performance testing method based on the visual device for testing the plugging belt pressure bearing performance considering the fluid loss comprises the following steps:
s1, enclosing a back plate 11, an upper filter plate 15, a lower filter plate 17, a second partition plate 14 and a baffle 20 into a plurality of independent fluid loss chambers 16, and connecting each fluid loss chamber 16 with a second valve 12 and a second pressure sensor 13 to form a test box 1;
s2, a first pressure sensor 7 is arranged on a liquid inlet pipeline 6 of the test box 1, and a first valve 9 is arranged on a liquid outlet pipeline 8 of the test box 1; a light shield 10 is arranged at the front end of the test box 1, and a camera aligned with the test crack is placed;
s3, presetting and stirring a plugging material and drilling fluid in the stirring kettle 2; presetting drilling fluid in an intermediate container 3; the test box 1, the stirring kettle 2, the intermediate container 3 and the liquid pump 4 are connected; starting a light source at the rear end of the backboard 11;
s4, opening a first valve 9 and a second valve 12, applying pressure to the intermediate container 3 through the liquid pump 4, enabling the drilling fluid in the intermediate container 3 to enter the stirring kettle 2, and enabling the mixed fluid in the stirring kettle 2 to enter the test box 1; the pressure of the liquid pump 4 is regulated, so that the data of the first pressure sensor 7 is stabilized at a set value;
s5, continuously acquiring image data of a camera, and counting the fluid loss through a first valve 9 and a second valve 12;
s6, judging whether a plugging band is formed in the test crack according to the image data of the camera, and if so, entering a step S8; otherwise, entering step S7;
s7, judging whether the pressing time of the liquid pump 4 reaches the set time, if so, judging that the plugging belt fails to form, and ending the test; otherwise, returning to the step S5;
s8, closing the second valve 12 to obtain pressure data of each second pressure sensor 13; acquiring position data of the plugging band through image data of a camera;
s9, testing the pressure bearing performance of the plugging belt: increasing the pressure of the liquid pump 4, recording the pressure data of the first pressure sensor 7 until the pressure bearing of the plugging belt fails, and taking the maximum pressure data of the first pressure sensor 7 as the maximum pressure bearing capacity of the plugging belt; and acquiring image data of the pressure bearing performance test of the plugging belt.
Step A1 is further included before step S3: a first sliding partition board 5 is arranged in the middle container 3, so that the middle container 3 is divided into two accommodating spaces; adding drilling fluid into a containing space connected with the stirring kettle 2; the liquid pump 4 is connected to the other accommodation space and water is supplied to the liquid pump 4 as a pressurizing medium.
The following operations are also included in step S1: the convex stopper 33 on the second opening control plate 25 is placed in the opening 32, one end of the threaded rod 28 is connected to the universal ball head 27, the threaded rod 28 is moved forward and backward relative to the back plate 11 by rotating the wheel disc 29, the second opening control plate 25 is pushed and pulled, and the amount of overlap of the flow ports 26 on the first opening control plate 24 and the second opening control plate 25 is controlled so that the opening value of each opening adjusting member is set.
The specific method for setting the opening value of each opening adjusting component to the set value comprises the following substeps:
b1, performing fluid loss test on the single fluid loss chamber 16 according to the formula:
the opening value of the opening adjusting part is obtained asaThe cross-sectional area of the crack isbTime-dependent fluid loss factorFurther obtain different opening values of the opening adjusting component and the cross section area of the crack asbThe corresponding fluid loss coefficient; wherein->Is an opening value ofaThe filtration loss at that time; t is the fluid loss test duration;bis the cross-sectional area of the crack;
b2, different opening values of the opposite opening adjusting component and the cross section area of the crack arebPerforming linear fitting on the corresponding fluid loss coefficients to obtain a corresponding relation between the opening value of the opening adjusting component and the fluid loss coefficients;
and B3, taking the opening value corresponding to the fluid loss coefficient of the target rock plate as a set value, and enabling the opening value of each opening adjusting component to be a corresponding set value.
In an embodiment, the camera may observe the light from the test slit when the occluding tape is not formed. When the plugging belt is formed, the plugging belt can shield light, a shadow area is formed, when the shadow area crosses the upper filter plate and the lower filter plate, the plugging belt is indicated to be formed preliminarily, and if the plugging belt needs to be made to develop continuously, the current test condition is kept continuously. Otherwise, closing the second valve 12, acquiring pressure data of each second pressure sensor 13, taking the second pressure sensor 13 close to the liquid inlet pipeline 6 as an upstream, sequentially recording the numerical value of each second pressure sensor 13, linearly regressing the data points by taking the length of the plugging band as an abscissa and the pressure as an ordinate, and acquiring the gradient of the pressure drop inside the plugging band by acquiring the gradient of a regression curve.
In one embodiment of the present invention, since the threaded rod 28 is in threaded connection with the back plate 11, the threaded rod 28 moves relative to the back plate 11 when rotating, and the threaded rod 28 can rotate relative to the second opening control plate 25 and drive the second opening control plate 25 to move through the connection mode of the universal ball head 27, and the threaded connection has strong tightness, so that loss of fluid loss from the threaded rod 28 can be avoided. And the convex-shaped limiter 33 on the second opening control plate 25 can be attached to the first opening control plate 24, so that the pressure bearing capacity of the second opening control plate 25 is enhanced, the filter plate and the fluid loss chamber 16 can be isolated, and filtrate in a test crack is prevented from entering the fluid loss chamber 16.
In summary, the invention combines the plugging belt preparation function with the plugging belt bearing capacity test, and solves the problems that the plugging belt of the conventional plugging belt bearing capacity test device needs to shift positions to finally cause inaccurate bearing capacity measurement and can not simulate the plugging belt bearing capacity test under the condition of fluid loss on the basis of realizing the visualization of the test process.
Claims (9)
1. The visual device for testing the pressure-bearing performance of the plugging zone taking the fluid loss into consideration is characterized by comprising a test box (1), wherein a liquid inlet pipeline (6) and a liquid outlet pipeline (8) are respectively arranged at two sides of the test box (1); the other end of the liquid inlet pipeline (6) is connected with the stirring kettle (2); the stirring kettle (2) is connected with one end of the intermediate container (3); the other end of the intermediate container (3) is connected with a liquid pump (4), and drilling fluid is arranged in the intermediate container (3); a first pressure sensor (7) is arranged on the liquid inlet pipeline (6); a first valve (9) is arranged on the liquid outlet pipeline (8);
the test box (1) comprises a back plate (11); the other five surfaces of the back plate (11) are provided with baffle plates (20) and are enclosed into a box body; two rows of second partition boards (14) are transversely arranged on the back board (11); an upper filter plate (15) and a lower filter plate (17) are arranged between the two rows of second partition plates (14), and test cracks are formed between the upper filter plate (15) and the lower filter plate (17); the back plate (11), the upper filter plate (15), the lower filter plate (17), the second partition plate (14) and the baffle plate (20) enclose a plurality of independent fluid loss chambers (16); each fluid loss cavity (16) is connected with a second valve (12) and a second pressure sensor (13);
the baffle plate (20) positioned at the front end of the backboard (11) comprises an upper light shielding plate (21), a light transmitting plate (22) and a lower light shielding plate (23) which are sequentially arranged from top to bottom; the position of the backboard (11) corresponding to the test crack is made of a light-transmitting material, and the rear end of the backboard (11) is provided with a light source; a light shield (10) is arranged at the front end of the test box (1), and a camera aligned with the test crack is arranged in the light shield (10);
an opening adjusting part is arranged in at least one fluid loss chamber (16); the opening degree adjusting part comprises a first opening degree control plate (24) and a second opening degree control plate (25); the first opening control plate (24) and the second opening control plate (25) are respectively provided with a circulation port (26);
the first opening control plate (24) is respectively fixed with the back plate (11) and the corresponding second partition plate (14) and is arranged at one end close to the test crack; the first opening control board (24) is provided with a convex-shaped groove body (31); an opening (32) is arranged on the convex-shaped groove body (31);
a convex-shaped limiter (33) matched with the convex-shaped groove body (31) and the opening (32) is arranged on the second opening control plate (25); the rear end of the second opening control plate (25) is connected with one end of a threaded rod (28) through a universal ball head (27); the other end of the threaded rod (28) penetrates out of the back plate (11) and is provided with a wheel disc (29); the threaded rod (28) is in threaded connection with the back plate (11);
the opening value of the opening adjusting member is controlled by the overlapping amount of the flow ports (26) on the first opening control plate (24) and the second opening control plate (25).
2. The visual device for testing the pressure-bearing performance of the plugging zone considering the fluid loss according to claim 1, wherein a first sliding partition plate (5) is arranged in the intermediate container (3), and the first partition plate (5) divides the first sliding partition plate into two accommodating spaces; the drilling fluid is arranged in an accommodating space connected with the stirring kettle (2); the liquid pump (4) is connected with the other accommodating space.
3. The visual device for testing the pressure-bearing performance of the plugging zone considering the fluid loss according to claim 1, wherein a limiting table (18) for supporting the upper filter plate (15) is arranged on the back plate (11).
4. The visual device for testing the pressure-bearing performance of the plugging zone considering the fluid loss according to claim 1, wherein the edges of the second partition plate (14) are provided with first sealing rubber strips (19) for sealing.
5. The visual device for testing the pressure-bearing performance of the plugging band considering the fluid loss according to claim 1, wherein the second sealing rubber strips are arranged around the circulation port (26).
6. A plugging band pressure-bearing performance testing method based on the visual device for testing the pressure-bearing performance of the plugging band considering fluid loss according to any one of claims 1 to 5, which is characterized by comprising the following steps:
s1, enclosing a back plate (11), an upper filter plate (15), a lower filter plate (17), a second partition plate (14) and a baffle plate (20) into a plurality of independent fluid loss chambers (16), and connecting each fluid loss chamber (16) with a second valve (12) and a second pressure sensor (13) to form a test box (1);
s2, a first pressure sensor (7) is arranged on a liquid inlet pipeline (6) of the test box (1), and a first valve (9) is arranged on a liquid outlet pipeline (8) of the test box (1); a light shield (10) is arranged at the front end of the test box (1), and a camera aligned with the test crack is placed;
s3, presetting and stirring a plugging material and drilling fluid in the stirring kettle (2); presetting drilling fluid in an intermediate container (3); the test box (1), the stirring kettle (2), the intermediate container (3) and the liquid pump (4) are connected; starting a light source at the rear end of the backboard (11);
s4, opening a first valve (9) and a second valve (12), and pressing the intermediate container (3) through the liquid pump (4) to enable drilling fluid in the intermediate container (3) to enter the stirring kettle (2) and enable mixed fluid in the stirring kettle (2) to enter the test box (1); adjusting the pressure of the liquid pump (4) to enable the data of the first pressure sensor (7) to be stabilized at a set value;
s5, continuously acquiring image data of a camera, and counting the fluid loss through a first valve (9) and a second valve (12);
s6, judging whether a plugging band is formed in the test crack according to the image data of the camera, and if so, entering a step S8; otherwise, entering step S7;
s7, judging whether the pressing time of the liquid pump (4) reaches the set time, if so, judging that the plugging belt fails to form, and ending the test; otherwise, returning to the step S5;
s8, closing the second valve (12) to acquire pressure data of each second pressure sensor (13); acquiring position data of the plugging band through image data of a camera;
s9, testing the pressure bearing performance of the plugging belt: increasing the pressure of the liquid pump (4), recording the pressure data of the first pressure sensor (7) until the pressure bearing of the plugging belt fails, and taking the maximum pressure data of the first pressure sensor (7) as the maximum pressure bearing capacity of the plugging belt; and acquiring image data of the pressure bearing performance test of the plugging belt.
7. The method for testing the pressure-bearing performance of the plugging band according to claim 6, further comprising the step A1 before the step S3:
a first sliding partition plate (5) is arranged in the middle container (3) to divide the middle container (3) into two accommodating spaces; adding drilling fluid into a containing space connected with the stirring kettle (2); the liquid pump (4) is connected to the other receiving space and water is supplied to the liquid pump (4) as a pressurizing medium.
8. The method for testing the pressure-bearing performance of the plugging band according to claim 6, wherein the following operations are further included in the step S1:
a convex-shaped limiter (33) on a second opening control plate (25) is placed in an opening (32), one end of a threaded rod (28) is connected with a universal ball head (27), the threaded rod (28) moves back and forth relative to a back plate (11) through a rotary wheel disc (29), the second opening control plate (25) is pushed and pulled, the superposition amount of a circulation opening (26) on a first opening control plate (24) and a second opening control plate (25) is controlled, and the opening value of each opening adjusting part is set to be a set value.
9. The method for testing the pressure-bearing performance of the plugging band according to claim 8, wherein the specific method for setting the opening value of each opening adjusting member to the set value comprises the following sub-steps:
b1, performing fluid loss test on a single fluid loss chamber (16), and according to the formula:
the opening value of the opening adjusting part is obtained asaThe cross-sectional area of the crack isbTime-dependent fluid loss factorFurther obtain different opening values of the opening adjusting component and the cross section area of the crack asbThe corresponding fluid loss coefficient; wherein->Is an opening value ofaThe filtration loss at that time; t is the fluid loss test duration;bis the cross-sectional area of the crack;
b2, different opening values of the opposite opening adjusting component and the cross section area of the crack arebPerforming linear fitting on the corresponding fluid loss coefficients to obtain a corresponding relation between the opening value of the opening adjusting component and the fluid loss coefficients;
and B3, taking the opening value corresponding to the fluid loss coefficient of the target rock plate as a set value, and enabling the opening value of each opening adjusting component to be a corresponding set value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310546276.9A CN116256239B (en) | 2023-05-16 | 2023-05-16 | Visual device and method for testing pressure bearing performance of plugging band considering fluid loss |
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