Evaluation device for multi-stage pressure bearing capacity of gel and swellable materials

Abstract

The utility model discloses a multistage loading capacity evaluation device for gel and volume expansion materials, which relates to the field of leakage control equipment and comprises a kettle body, a clamping component is arranged outside the kettle body, a crack structure control system is arranged inside the kettle body, a temperature control system is mounted inside the kettle body, and the temperature control system is connected with the clamping component. A data acquisition system is arranged on one side of the kettle body, a precision pressure gauge is arranged at the top of the kettle body, a nitrogen cylinder is arranged on one side of the kettle body, and an upper plug and a lower plug are respectively mounted at two ends of the kettle body. According to the utility model, the migration and multi-stage pressure bearing process of a plugging body formed by gel and a volume expansion plugging material in combinations of cracks and caves with different widths is simulated, and the plugging mechanism of the plugging body in large-scale cracks and caves is described by visually observing the extrusion, expansion and filling processes of the plugging body in the plugging process; the leakage rate and the pressure bearing capacity are accurately measured, the accuracy of plugging effect evaluation is improved, and the method has important significance on effective control over leakage.

Description

TECHNICAL FIELD

[0001] The utility model relates to the leakage control equipment field, concretely is a kind of gel and body swelling class material multistage pressure-bearing capacity evaluation device. BACKGROUND

[0002] With exploration and development gradually to complex formation drilling, drilling encounters karst cave, big fracture more and more, malignant leakage occurs more and more frequently, causes huge economic loss, effectively cementing near wellbore in shorter time, prevents drilling fluid from entering formation, is the key to big fracture, karst cave plugging problem.

[0003] Gel and body swelling class plugging material have good pressure deformability, can be self-adaptive into different scale leakage passage without being limited by its form, easily form high-strength plug sealing body in leakage passage, are suitable for big scale fracture and karst cave type leakage passage plugging material, gel and body swelling class plugging material can pass through different width fractures and karst caves under the action of pressure during plugging process, finally form a long distance plug sealing body by continuous filling, accumulation and compaction under the action of shear force, and have good plugging effect to big fracture.

[0004] Existing simulation leakage passage is usually single slit type structure and gel and body swelling class plugging material plugging pressure-bearing capacity is usually judged by one-time breakthrough pressure, cannot simulate multistage pressure-bearing process of plug sealing body under slit-hole series structure, is difficult to accurately judge its pressure-bearing capacity, secondly, gel and body swelling class plugging material extrusion, expansion and filling process in big scale fracture and karst cave cannot be observed by vision, is difficult to describe its plugging mechanism in big fracture development malignant leakage formation, and now visual plugging evaluation device has problems of low pressure strength, short leakage simulation passage, small fracture width, low temperature resistance and cannot add confining pressure, cannot effectively evaluate the plugging effect of gel and body swelling class plugging material. UTILITY MODEL CONTENTS

[0005] Based on this, the utility model aims at providing a kind of gel and body swelling class material multistage pressure-bearing capacity evaluation device to solve the technical problems mentioned in the above background art.

[0006] To achieve the above object, the utility model provides the following technical scheme: a gel and body swells material multistage pressure-bearing capacity evaluation device, including cauldron body, the outside of cauldron body is provided with clamping assembly, and the inside of cauldron body is provided with crack structure control system, the inside of cauldron body is installed with temperature control system, and one side of cauldron body is provided with data acquisition system, and the top of cauldron body is provided with precision pressure gauge, one side of cauldron body is provided with nitrogen cylinder, both ends of cauldron body are installed with upper plug and lower plug respectively, the inside of cauldron body is provided with liquid storage chamber and confining pressure liquid chamber, crack structure control system is composed of first core column, second core column and third core column, the inside of first core column is provided with first flow channel, and the inner wall of first core column is conically arranged, the inside of second core column is provided with second flow channel and fourth flow channel, and fourth flow channel is less than second flow channel, the inside of third core column is provided with second flow channel, third flow channel and fourth flow channel, and the inside of fourth flow channel is less than third flow channel, and the inner wall of third flow channel is less than second flow channel.

[0007] By adopting the above technical scheme, the migration and multistage pressure-bearing process of the plugging body formed by the gel and body swells plugging material in different width cracks and cave combinations are simulated, the extrusion, expansion and filling process in the plugging process is observed visually, the plugging mechanism in large-scale cracks and caves is described, the leakage rate and pressure-bearing capacity are accurately measured, the accuracy of the plugging effect evaluation is improved, and the effective control of leakage has important significance.

[0008] The utility model further sets up, temperature control system includes the heating system of installation in the inside of cauldron body.

[0009] As preferred, the heating system can heat the cauldron conveniently, and facilitate subsequent operation.

[0010] The utility model further sets up, the top of upper plug is provided with high pressure needle valve, and high pressure needle valve's top installs precision pressure gauge, high pressure needle valve is connected with nitrogen cylinder through pipeline.

[0011] As preferred, the precision pressure gauge can observe the pressure in the cauldron, and the high pressure needle valve can connect the nitrogen cylinder and the cauldron.

[0012] The utility model further sets up, the bottom of lower plug is provided with ball valve, and ball valve's bottom is provided with liquid outlet pipe.

[0013] As preferred, the ball valve can open and close the cauldron, and the cauldron is in a sealed state when closed.

[0014] The utility model further sets up, electronic balance is arranged below the cauldron body, and electronic balance is located below the liquid outlet pipe.

[0015] As preferred, the electronic balance can measure the falling liquid, and the data acquisition system receives data through the data line and forms the multi-stage pressure-bearing capacity curve of the plugging body in the software.

[0016] The utility model further sets up, the inside of cauldron body is provided with metal washer.

[0017] As preferred, the metal washer can ensure the sealing property of the inside.

[0018] The utility model further sets up, the clamping component includes support, universal wheel, speed reducer, support frame and fixed ring and is composed, the support frame is movably installed above the support, and the end of support frame is fixed with fixed ring, and the fixed ring is set in the outer wall of cauldron body, the one side of support is installed with speed reducer, and the bottom of support is provided with universal wheel.

[0019] As preferred, the universal wheel can facilitate the movement of the equipment, the support frame and the fixed ring can install the cauldron body, and the support can avoid the contact between the cauldron body and the ground.

[0020] In summary, the utility model mainly has the following beneficial effects:

[0021] 1、The utility model discloses a cauldron body, crack structure control system and metal washer are set up, simulate the migration and multi-stage pressure-bearing process of the plugging body formed by gel and body expansion type plugging material in different width cracks and cave combination, observe its extrusion, expansion and filling process in the plugging process by vision, describe its plugging mechanism in large scale crack and cave, accurately measure the leakage rate and pressure-bearing capacity, improve the accuracy of plugging effect evaluation, and it has important significance to the effective control of leakage.

[0022] 2、The utility model discloses a plurality of core columns, and the different crack type core columns are combined, which can simulate different crack-cave series structure channel conditions, simulate the migration and multi-stage pressure-bearing process of the slug plugging body formed by gel and body expansion type plugging material in different width cracks and cave combination, the material of cauldron body and core column is glass transparent material, and the transparent cauldron body and transparent multiple machine glass core column are used to simulate crack leakage conditions, which can observe the extrusion, expansion and filling process of the slug plugging body in the plugging process by vision, and describe its plugging mechanism in large scale crack and cave. DRAWINGS

[0023] Figure 1 It is the structural schematic drawing of the utility model.

[0024] Figure 2 is a sectional view of the kettle body of the present application;

[0025] Figure 3 is a structural schematic view of the support of the present application;

[0026] Figure 4 is a perspective view of the first core column of the present application;

[0027] Figure 5 is a perspective view of the second core column of the present application;

[0028] Figure 6 is a perspective view of the third core column of the present application;

[0029] Figure 7 is a sectional view of the first core column of the present application;

[0030] Figure 8 is a sectional view of the second core column of the present application;

[0031] Figure 9 is a sectional view of the third core column of the present application.

[0032] Explanation of reference signs:

[0033] 1, kettle body; 2, support; 21, universal wheel; 22, speed reducer; 23, support frame; 24, fixing ring; 3, fracture structure control system; 31, first core column; 32, second core column; 33, third core column; 34, first flow-through groove; 35, second flow-through groove; 36, third flow-through groove; 37, fourth flow-through groove; 4, nitrogen cylinder; 5, temperature control system; 6, data acquisition system; 7, precision pressure gauge; 8, high-pressure needle valve; 9, upper plug; 10, liquid storage chamber; 11, metal gasket; 12, heating system; 13, confining pressure liquid chamber; 14, lower plug; 15, ball valve; 16, liquid outlet pipe; 17, electronic balance. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. The embodiments described below with reference to the drawings are exemplary and are used only for explaining the present application, and cannot be understood as a limitation of the present application.

[0035] The embodiments of the present application will be described below according to the overall structure of the present application.

[0036] Please refer to Figures 1-9, including kettle body 1, the outside of kettle body 1 is provided with clamping assembly, and the inside of kettle body 1 is provided with crack structure control system 3, temperature control system 5 is installed in the inside of kettle body 1, and data acquisition system 6 is arranged on the side of kettle body 1, and precise pressure gauge 7 is arranged on the top of kettle body 1, nitrogen cylinder 4 is arranged on the side of kettle body 1, upper plug 9 and lower plug 14 are respectively installed at both ends of kettle body 1, liquid storage chamber 10 and confining pressure liquid chamber 13 are arranged in the inside of kettle body 1, crack structure control system 3 is composed of first core column 31, second core column 32 and third core column 33, any four groups of first core column 31, second core column 32 and third core column 33 are composed, different fracture-cave series structure channel conditions can be simulated, the migration of the slug plugging body formed by gel and body swelling plugging materials in different width fractures and cave combinations and the multistage pressure-bearing process can be simulated, the material of kettle body 1, first core column 31, second core column 32 and third core column 33 is transparent glass material, first flow-through groove 34 is arranged in the inside of first core column 31, and the inner wall of first core column 31 is conical, second flow-through groove 35 and fourth flow-through groove 37 are arranged in the inside of second core column 32, and fourth flow-through groove 37 is smaller than second flow-through groove 35, second flow-through groove 35, third flow-through groove 36 and fourth flow-through groove 37 are arranged in the inside of third core column 33, and the inside of fourth flow-through groove 37 is smaller than third flow-through groove 36, and the inner wall of third flow-through groove 36 is smaller than second flow-through groove 35.

[0037] In the above embodiment, please refer to Figure 2 , temperature control system 5 includes heating system 12 installed in the inside of kettle body 1, the kettle body 1 can be heated conveniently through the heating system 12, which is convenient for subsequent operation.

[0038] In the above embodiment, please refer to Figure 2 , high-pressure needle valve 8 is arranged on the top of upper plug 9, and precise pressure gauge 7 is installed on the top of high-pressure needle valve 8, high-pressure needle valve 8 is connected with nitrogen cylinder 4 through pipeline, the pressure condition in the inside of kettle body 1 can be observed conveniently through the precise pressure gauge 7, and high-pressure needle valve 8 can conveniently connect nitrogen cylinder 4 with kettle body 1.

[0039] In the above embodiment, please refer to Figure 2 , ball valve 15 is arranged on the bottom of lower plug 14, and liquid outlet pipe 16 is arranged on the bottom of ball valve 15, the kettle body 1 can be conveniently opened and closed through the ball valve 15, so that the kettle body 1 is in a sealed state when closed.

[0040] In the above embodiment, please refer to Figure 2, the lower part of the kettle body 1 is provided with an electronic balance 17, and the electronic balance 17 is located below the liquid outlet pipe 16, the data acquisition system 6 is a computer, the falling liquid can be measured through the electronic balance 17, the working liquid leakage amount and the leakage rate in the plugging process can be measured in real time, and the data acquisition system 6 receives data through a data line and forms a multi-stage pressure-bearing capacity curve of the plugging body in software.

[0041] In the above embodiment, please refer to Figure 1 and Figure 2 , the inside of the kettle body 1 is provided with a metal gasket 11, and the metal gasket 11 can ensure the sealing property of the inside.

[0042] In the above embodiment, please refer to Figure 3 , the clamping assembly comprises a support 2, universal wheels 21, a speed reducer 22, a support frame 23 and a fixing ring 24, the support frame 23 is movably installed above the support 2, the fixing ring 24 is fixed at the end of the support frame 23 and is sleeved on the outer wall of the kettle body 1, the speed reducer 22 is installed on one side of the support 2, and the universal wheels 21 are arranged at the bottom of the support 2, the kettle body 1 can be installed through the support frame and the fixing ring, and the support 2 can avoid the contact between the kettle body 1 and the ground.

[0043] In the specific work, when in use, the kettle body 1 is installed in the inside of the fixing ring 24, the kettle body 1 rotates around the support frame 23, then the lower plug 14 is opened, four groups of the first core column 31, the second core column 32 and the third core column 33 are combined to form the crack structure control system 3, then the lower plug 14 is closed, the crack structure control system 3 is pressed tightly, then the kettle body 1 rotates to the vertical state, then the kettle body 1 is preheated to the experimental temperature (80 DEG C) through the heating system 12, and the confining pressure is added to 15 MPa; the solidified material with one eighth of the crack volume is measured, is mixed with the swelling material at a mass ratio of 1:1, is fully stirred for 5 min, and is poured into the crack module together with the same volume of water, and forms the crack plugging body after curing for 30 min; the working liquid is added to the liquid storage chamber and stirred for a period of time, then the valve is opened, the displacement pump is started to pressurize to 0.5 MPa, the outlet valve is opened after 2 min, and then the pressure is increased at a pressure gradient of 1.5 min, each pressure point is stable for 5 min, if the kettle body pressure sharply decreases during the pressurization process and is not recovered, the crack plugging body is considered to be broken, the last stable pressure point is recorded as the plugging pressure-bearing capacity, and the experiment is ended; in the experiment, with the increase of the pressure, the plugging body is gradually compacted, gradually reaches the peak value of the pressure-bearing capacity, and then the pressure-bearing capacity decreases in steps with the plugging body being damaged; under the action of the pressure, smaller blocks in the plugging body are flushed out of the kettle body, larger blocks re-bridge in the cracks, but the overall pressure-bearing capacity is low, and the plugging body has the characteristics of two-stage pressure-bearing with two platforms.

[0044] Although the embodiments of the utility model have been shown and described, the specific embodiments are only the interpretation of the utility model, and are not the limitation of the utility model, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable way, the person skilled in the art can make the modification, replacement and change of no creative contribution to the embodiment according to the need after reading the specification without departing from the principles and the purpose of the utility model, but as long as in the scope of the claim of the utility model, it is protected by the patent law.

Claims

1. A multi-level pressure-bearing capacity evaluation device for gels and bulk-swellable materials, comprising a vessel body (1), wherein a clamping assembly is provided on the outside of the vessel body (1), and a crack structure control system (3) is provided inside the vessel body (1), a temperature control system (5) is installed inside the vessel body (1), a data acquisition system (6) is provided on one side of the vessel body (1), and a precision pressure gauge (7) is provided on the top of the vessel body (1), a nitrogen cylinder (4) is provided on one side of the vessel body (1), an upper plug (9) and a lower plug (14) are respectively installed at both ends of the vessel body (1), and a liquid storage chamber (10) and a confining pressure chamber (13) are provided inside the vessel body (1), characterized in that: The crack structure control system (3) is composed of a first core column (31), a second core column (32) and a third core column (33).

2. The apparatus according to claim 1, wherein the apparatus is characterized by: The first core column (31) is internally provided with a first flow channel (34), and the inner wall of the first core column (31) is conical; the second core column (32) is internally provided with a second flow channel (35) and a fourth flow channel (37), and the fourth flow channel (37) is smaller than the second flow channel (35); the third core column (33) is internally provided with a second flow channel (35), a third flow channel (36) and a fourth flow channel (37), and the inner part of the fourth flow channel (37) is smaller than the third flow channel (36), and the inner wall of the third flow channel (36) is smaller than the second flow channel (35).

3. The apparatus according to claim 1, wherein the apparatus is characterized by: The temperature control system (5) comprises a heating system (12) installed inside the kettle body (1).

4. The apparatus for evaluating the multi-stage pressure-bearing capacity of a gel and a body-swelling material according to claim 1, characterized in that: The top of the upper plug (9) is provided with a high-pressure needle valve (8), the top of the high-pressure needle valve (8) is provided with a precision pressure gauge (7), and the high-pressure needle valve (8) is connected with the nitrogen cylinder (4) through a pipeline.

5. The apparatus for evaluating the multi-stage pressure-bearing capacity of a gel and a body-swelling material according to claim 1, characterized in that: The bottom of the lower plug (14) is provided with a ball valve (15), and the bottom of the ball valve (15) is provided with a liquid outlet pipe (16).

6. The apparatus according to claim 5, wherein the apparatus is characterized by: The bottom of the kettle body (1) is provided with an electronic balance (17), and the electronic balance (17) is located below the liquid outlet pipe (16).

7. The apparatus of claim 1, wherein: The inside of the kettle body (1) is provided with a metal gasket (11).

8. The apparatus of claim 1, wherein: The clamping assembly comprises a support (2), a universal wheel (21), a speed reducer (22), a support frame (23) and a fixing ring (24), the upper part of the support (2) is movably provided with the support frame (23), the end of the support frame (23) is fixedly provided with the fixing ring (24), the fixing ring (24) is sleeved on the outer wall of the kettle body (1), one side of the support (2) is provided with the speed reducer (22), and the bottom of the support (2) is provided with the universal wheel (21).

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