Self-control rock core clamping device

Abstract

The utility model discloses a self-control rock core clamping device which comprises a kettle body, an inner rubber sleeve and a pressing rod mechanism, a sliding block is arranged at one end, close to a rock core sample block, of a fixed pressing rod, an adjusting pressing rod is connected with the other end of the kettle body through a cylinder body, a confining pressure cavity is formed between the inner rubber sleeve and the kettle body, and a confining pressure connector and a back pressure connector are arranged on the kettle body. The confining pressure connector is connected with a high-pressure tank through a first automatic pressure regulating valve and a first conveying pipe, a back pressure valve is arranged outside the back pressure connector, the adjusting pressure rod is a reducing adjusting pressure rod, a pressure cavity is formed between the small-diameter portion of the reducing adjusting pressure rod and the inner wall of the cylinder body, and a pressure regulating connector is arranged on the cylinder body. And the pressure regulating joint is connected with the high-pressure tank through a second automatic pressure regulating valve and a second transmission pipe. The pressure in the confining pressure cavity is automatically controlled to be maintained at a target pressure value through the first automatic pressure regulating valve and the back pressure valve, pressure is applied to the core sample block in the radial direction, the second automatic pressure regulating valve is automatically controlled to apply pressure to the pressure cavity, and the adjusting pressure rod is driven to apply pressure to the core sample block in the circumferential direction.

Description

Technical Field

[0001] The utility model belongs to the technical field of core clamping, and in particular relates to an automatic core clamping device. Background Art

[0002] The core holder is a tool used to clamp, protect the rock sample and seal the cylinder or end face (generally the end face with fluid inlet and outlet) when measuring the seepage characteristics of the rock sample or conducting displacement tests in the laboratory. It is an indispensable and important auxiliary component in the development of experimental instruments and devices. The existing core holder can apply different axial and radial pressures to the end face of the rock sample and the surrounding cylinder respectively, and is used for displacement tests of full-diameter cores to simulate the seepage characteristics of the fluid when the overburden pressure and the formation flow pressure change. However, the existing core holders that can apply different axial and radial pressures to the end face of the rock sample and the surrounding cylinder are often complex in structure, with many parts, cumbersome installation, and the process of adjusting the pressure to the target pressure is uncontrollable, the pressure adjustment efficiency is low, and the test error is large. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide an automatic core clamping device in view of the deficiencies in the above-mentioned prior art. The device has a novel and reasonable design, few parts, and an ingenious and compact structure. The device automatically controls the pressure in the confining pressure chamber to maintain a target pressure value through a first automatic pressure regulating valve and a back pressure valve, applies radial pressure to the core sample block, automatically controls the second automatic pressure regulating valve to pressurize the pressure chamber, and drives the adjusting pressure rod to apply circumferential pressure to the core sample block, which is convenient for promotion and use.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: a self-controlled core clamping device, characterized in that it includes a kettle body, an inner rubber sleeve arranged in the kettle body for wrapping the core sample block, and a pressure rod mechanism passing through the kettle body for clamping the core sample block, the pressure rod mechanism includes a fixed pressure rod extending from one end of the kettle body into the cylinder and an adjusting pressure rod extending from the other end of the kettle body into the cylinder, a sliding block extending into the inner rubber sleeve is arranged on the outer sleeve of one end of the fixed pressure rod close to the core sample block, the outer side of the end of the fixed pressure rod away from the core sample block is connected to one end of the kettle body through a fixed sleeve and a fixed pressure block, the adjusting pressure rod is connected to the other end of the kettle body through the cylinder body, a confining pressure cavity is provided between the inner rubber sleeve and the kettle body, and a confining pressure joint and a back pressure joint connected to the confining pressure cavity are provided on the kettle body. The confining pressure joint is connected to the high-pressure tank through a first transmission pipe, a first automatic pressure-regulating valve is arranged at one end where the confining pressure joint and the first transmission pipe are connected, a back-pressure valve is arranged outside the back-pressure joint, an adjusting pressure rod passes through the cylinder body and extends into the inner rubber sleeve, the adjusting pressure rod is a variable-diameter adjusting pressure rod, a half of the rod section of the variable-diameter adjusting pressure rod close to the outside is a small-diameter section, a half of the rod section of the variable-diameter adjusting pressure rod away from the outside is a large-diameter section, a pressure chamber is provided between the small-diameter section of the variable-diameter adjusting pressure rod and the inner wall of the cylinder body, a pressure-regulating joint connected to the pressure chamber is arranged on the cylinder body, the pressure-regulating joint is connected to the high-pressure tank through a second transmission pipe, a second automatic pressure-regulating valve is arranged at one end where the pressure-regulating joint and the second transmission pipe are connected, and the first automatic pressure-regulating valve, the back-pressure valve and the second automatic pressure-regulating valve are all connected to the controller.

[0005] The above-mentioned automatic core clamping device is characterized in that: an outlet joint is provided at one end of the fixed pressure rod away from the core sample block, and an inlet joint is provided at one end of the adjusting pressure rod away from the core sample block.

[0006] The above-mentioned automatic core clamping device is characterized in that: the end of the slider close to the inner rubber sleeve is provided with a conical sealing surface 1 that matches with one end of the inner rubber sleeve, and the end of the cylinder body close to the inner rubber sleeve is provided with a conical sealing surface 2 that matches with one end of the inner rubber sleeve.

[0007] The above-mentioned automatic core clamping device is characterized in that: the inner wall of the cylinder body that contacts the small diameter part of the variable diameter adjustment pressure rod is provided with a sealing component 1, and the inner wall of the cylinder body that contacts the large diameter part of the variable diameter adjustment pressure rod is provided with a sealing component 3.

[0008] The above-mentioned automatic core clamping device is characterized in that: a step groove is provided at a position on the outer wall of the cylinder body between the second sealing surface and the pressure regulating joint, the step outer diameter of the step groove close to the second sealing surface is larger than the step outer diameter of the step groove close to the pressure regulating joint, one end of the kettle body and the cylinder body is provided with a through hole adapted to the step of the step groove close to the pressure regulating joint, the outer wall of the step of the step groove close to the pressure regulating joint is provided with a sealing component 2 in contact with the inner wall of the through hole, and the step of the step groove close to the second sealing surface is located in the confining pressure chamber and is clamped with the end of the kettle body.

[0009] The above-mentioned automatic core clamping device is characterized in that: the end of the slider away from the inner rubber sleeve is a cylindrical structure, and the outer wall of the end of the slider away from the inner rubber sleeve is provided with a sealing component four in contact with the inner wall of the confining pressure chamber.

[0010] The above-mentioned automatic core clamping device is characterized in that the cylinder body is connected to the kettle body by bolts.

[0011] The beneficial effects of the utility model are that it has fewer parts and components, an ingenious and compact structure, and automatically controls the pressure in the confining pressure chamber to maintain at a target pressure value through the first automatic pressure regulating valve and the back pressure valve, applies radial pressure to the core sample block, automatically controls the second automatic pressure regulating valve to pressurize the pressure chamber, and drives the regulating pressure rod to apply circumferential pressure to the core sample block, which is easy to promote and use.

[0012] The technical solution of the utility model is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the utility model.

[0014] Figure 2 It is a schematic diagram of the connection relationship between the cylinder body, the inner rubber sleeve and the sliding block of the utility model.

[0015] Description of reference numerals:

[0016] 1—Cylinder body; 2—Adjusting pressure rod; 3—Inlet joint;

[0017] 4—bolt; 5—kettle body; 6—inner rubber sleeve;

[0018] 7—confining pressure chamber; 8—core sample; 9—sliding block;

[0019] 10—fixed pressure block; 11—fixed sleeve; 12—export connector;

[0020] 13—fixed pressure rod; 14—confining pressure joint; 15—back pressure joint;

[0021] 16—pressure regulating joint; 17—sealing component 1; 18—sealing component 2;

[0022] 19—sealing component three; 20—sealing component four; 21—sealing surface one;

[0023] 22—Second sealing surface; 23—Pressure chamber; 24—First automatic pressure regulating valve;

[0024] 25—Second automatic pressure regulating valve; 26—Back pressure valve; 27—High pressure tank;

[0025] 28—first transmission pipe; 29—second transmission pipe. DETAILED DESCRIPTION

[0026] like Figure 1 and Figure 2 As shown, the utility model comprises a kettle body 5, an inner rubber sleeve 6 arranged in the kettle body 5 for wrapping a core sample block 8, and a pressure rod mechanism passing through the kettle body 5 for clamping the core sample block 8, wherein the pressure rod mechanism comprises a fixed pressure rod 13 extending from one end of the kettle body 5 into the cylinder and an adjusting pressure rod 2 extending from the other end of the kettle body 5 into the cylinder, an outer sleeve of the end of the fixed pressure rod 13 close to the core sample block 8 is provided with a sliding block 9 extending into the inner rubber sleeve 6, an outer side of an end of the fixed pressure rod 13 away from the core sample block 8 is connected to one end of the kettle body 5 through a fixed sleeve 11 and a fixed pressure block 10, the adjusting pressure rod 2 is connected to the other end of the kettle body 5 through the cylinder body 1, a confining pressure cavity 7 is provided between the inner rubber sleeve 6 and the kettle body 5, a confining pressure joint 14 and a back pressure joint 15 connected to the confining pressure cavity 7 are provided on the kettle body 5, the confining pressure joint 14 is connected to the high-pressure tank 27 through a first transmission pipe 28, and the confining pressure joint 14 and the first transmission pipe 28 are connected. A first automatic pressure regulating valve 24 is arranged at one end connected with the delivery pipe 28, a back pressure valve 26 is arranged outside the back pressure joint 15, the regulating pressure rod 2 passes through the cylinder body 1 and extends into the inner rubber sleeve 6, the regulating pressure rod 2 is a variable diameter regulating pressure rod, the half rod section of the variable diameter regulating pressure rod close to the outside is the small diameter section, and the half rod section of the variable diameter regulating pressure rod away from the outside is the large diameter section, and a pressure chamber 23 is provided between the small diameter section of the variable diameter regulating pressure rod and the inner wall of the cylinder body 1, a pressure regulating joint 16 connected to the pressure chamber 23 is arranged on the cylinder body 1, the pressure regulating joint 16 is connected to the high pressure tank 27 through the second transmission pipe 29, and a second automatic pressure regulating valve 25 is arranged at one end where the pressure regulating joint 16 and the second transmission pipe 29 are connected, the first automatic pressure regulating valve 24, the back pressure valve 26 and the second automatic pressure regulating valve 25 are all connected to the controller, and the controller adopts an industrial computer, a PLC controller or a control board with an integrated microcontroller.

[0027] It should be noted that there are few parts, the structure is ingenious and compact, and the pressure in the confining pressure chamber is automatically controlled by the first automatic pressure regulating valve and the back pressure valve to maintain the target pressure value, radial pressure is applied to the core sample, and the second automatic pressure regulating valve is automatically controlled to pressurize the pressure chamber, and the regulating pressure rod is driven to apply circumferential pressure to the core sample. The back pressure valve can set the target pressure. When the pressure in the confining pressure chamber 7 is smaller than the set pressure, the back pressure valve blocks the pipeline to maintain the pressure; when the pressure in the confining pressure chamber 7 is larger than the set pressure, the back pressure valve is opened to reduce the pressure.

[0028] In this embodiment, an outlet joint 12 is provided at one end of the fixed pressure rod 13 away from the core sample block 8 , and an inlet joint 3 is provided at one end of the adjustable pressure rod 2 away from the core sample block 8 .

[0029] In this embodiment, the end of the slider 9 close to the inner rubber sleeve 6 is provided with a conical sealing surface 21 that cooperates with one end of the inner rubber sleeve 6, and the end of the cylinder body 1 close to the inner rubber sleeve 6 is provided with a conical sealing surface 22 that cooperates with one end of the inner rubber sleeve 6.

[0030] In this embodiment, the inner wall of the cylinder body 1 that contacts the small diameter portion of the variable diameter adjusting rod is provided with a sealing component 17, and the inner wall of the cylinder body 1 that contacts the large diameter portion of the variable diameter adjusting rod is provided with a sealing component 3 19.

[0031] In this embodiment, a step groove is provided at a position of the outer wall of the cylinder body 1 between the sealing surface 22 and the pressure regulating joint 16. The outer diameter of the step of the step groove close to the sealing surface 22 is larger than the outer diameter of the step of the step groove close to the pressure regulating joint 16. The end of the kettle body 5 that cooperates with the cylinder body 1 is provided with a through hole adapted to the step of the step groove close to the pressure regulating joint 16. The outer wall of the step of the step groove close to the pressure regulating joint 16 is provided with a sealing component 2 18 that contacts the inner wall of the through hole. The step of the step groove close to the sealing surface 22 is located in the confining pressure chamber 7 and is clamped with the end of the kettle body 5.

[0032] In this embodiment, the end of the slider 9 away from the inner rubber sleeve 6 is a cylindrical structure, and the outer wall of the end of the slider 9 away from the inner rubber sleeve 6 is provided with a sealing component 20 in contact with the inner wall of the confining pressure chamber 7.

[0033] In this embodiment, the cylinder body 1 is connected to the kettle body 5 via bolts 4 .

[0034] When the utility model is used, a confining pressure joint 14 and a back pressure joint 15 are arranged on the outside of the kettle body 5. The external pipelines of these two joints provide pressure to the confining pressure chamber 7 of the experimental sample to simulate the formation pressure environment. At the same time, the pipeline is connected to the first automatic pressure regulating valve. The experimental pressure value is set by using the controller. After the first automatic pressure regulating valve is opened, the confining pressure required for the experiment can be provided; the cylinder body 1 and the kettle body 5 are connected as a whole by bolts, and the experimental device is easy to disassemble. At the same time, a force point is provided for the cylinder body 1. The cylinder body 1 is provided with a pressure regulating joint 16. The external pipeline of the joint can provide the experimental pressure to the regulating pressure rod 2, which is used to drive the regulating pressure rod 2 to move in the cylinder body 1 and the inner rubber sleeve 6. At the same time, the regulating pressure rod 2 provides the experimental pressure to the core sample block 8. This structure has a large movement range and is not limited by the length of the core within the design range. At the same time, the pipeline is connected to the second automatic pressure regulating valve. The experimental pressure value is set in the controller. After the second automatic pressure regulating valve is opened, the required pressure for the experiment can be provided; the slider 9 is the original cylinder, and A conical sealing surface 21 is set, the inner rubber sleeve 6 is a cylinder, and the material is a rubber body. The two are combined together under the action of external force, and the two are tightly combined under the pressure of the confining pressure chamber 7 to achieve sealing. The slider 9 is provided with a sealing component 4 20. The slider 9 is combined with the kettle body 5, and the joint surface of the two squeezes the sealing component 4 20 to deform, so as to achieve sealing between the confining pressure chamber 7 and the outside world; the cylinder body 1 is the original cylinder and is provided with a conical sealing surface 22, the inner rubber sleeve 6 is a cylinder, and the material is a rubber body. The two are combined together under the action of external force, and the two are tightly combined under the pressure of the confining pressure chamber 7 to achieve sealing. The cylinder body 1 is provided with a sealing component 2 18, and the cylinder body 1 is combined with the kettle body 5. The joint surface of the two squeezes the sealing component 2 18 to deform, so as to achieve sealing between the confining pressure chamber 7 and the outside world; the adjusting pressure rod 2 passes through the sealing component 17 and the sealing component 3 19 set by the cylinder body 1, and the sealing component is squeezed and deformed to achieve sealing to form a pressure chamber 23, and the pressure chamber 23 provides experimental force to the adjusting rod 2.

[0035] The above is only a preferred embodiment of the present invention and does not constitute any limitation to the present invention. Any simple modification, change and equivalent structural change made to the above embodiments according to the technical essence of the present invention shall still fall within the protection scope of the technical solution of the present invention.

Claims

1. An automatic core clamping device, characterized in that: The invention comprises a kettle body (5), an inner rubber sleeve (6) arranged in the kettle body (5) for wrapping a core sample (8), and a pressure rod mechanism passing through the kettle body (5) for clamping the core sample (8), wherein the pressure rod mechanism comprises a fixed pressure rod (13) extending from one end of the kettle body (5) into the cylinder and an adjusting pressure rod (2) extending from the other end of the kettle body (5) into the cylinder, and a sliding block (9) extending into the inner rubber sleeve (6) is provided on the outer sleeve of one end of the fixed pressure rod (13) close to the core sample (8). The outer side of one end of the constant pressure rod (13) away from the core sample block (8) is connected to one end of the kettle body (5) through a fixed sleeve (11) and a fixed pressure block (10); the adjusting pressure rod (2) is connected to the other end of the kettle body (5) through a cylinder body (1); a confining pressure cavity (7) is provided between the inner rubber sleeve (6) and the kettle body (5); a confining pressure joint (14) and a back pressure joint (15) which are connected to the confining pressure cavity (7) are provided on the kettle body (5); the confining pressure joint (14) is connected to the high pressure chamber (7) through a first transmission pipe (28); The pressure tank (27) is connected, the confining pressure joint (14) and the first transmission pipe (28) are connected at one end thereof, a first automatic pressure regulating valve (24) is arranged, a back pressure valve (26) is arranged outside the back pressure joint (15), the regulating pressure rod (2) passes through the cylinder body (1) and extends into the inner rubber sleeve (6), the regulating pressure rod (2) is a variable diameter regulating pressure rod, the half rod section of the variable diameter regulating pressure rod close to the outer side is the small diameter part, the half rod section of the variable diameter regulating pressure rod away from the outer side is the large diameter part, and the small diameter part of the variable diameter regulating pressure rod is the large diameter part. A pressure chamber (23) is provided between the cylinder body (1) and the inner wall of the cylinder body (1); a pressure regulating joint (16) in communication with the pressure chamber (23) is provided on the cylinder body (1); the pressure regulating joint (16) is connected to the high-pressure tank (27) via a second transmission pipe (29); a second automatic pressure regulating valve (25) is provided at one end where the pressure regulating joint (16) and the second transmission pipe (29) are connected; and the first automatic pressure regulating valve (24), the back pressure valve (26) and the second automatic pressure regulating valve (25) are all connected to the controller.

2. An automatic core clamping device according to claim 1, characterized in that: An outlet joint (12) is provided at one end of the fixed pressure rod (13) away from the core sample block (8), and an inlet joint (3) is provided at one end of the adjustable pressure rod (2) away from the core sample block (8).

3. An automatic core clamping device according to claim 1, characterized in that: The end of the slider (9) close to the inner rubber sleeve (6) is provided with a conical sealing surface (21) that matches with one end of the inner rubber sleeve (6), and the end of the cylinder body (1) close to the inner rubber sleeve (6) is provided with a conical sealing surface (22) that matches with one end of the inner rubber sleeve (6).

4. An automatic core clamping device according to claim 3, characterized in that: The inner wall of the cylinder body (1) in contact with the small diameter portion of the variable diameter adjustment pressure rod is provided with a sealing component one (17), and the inner wall of the cylinder body (1) in contact with the large diameter portion of the variable diameter adjustment pressure rod is provided with a sealing component three (19).

5. An automatic core clamping device according to claim 4, characterized in that: The outer wall of the cylinder body (1) is provided with a step groove at a position between the second sealing surface (22) and the pressure regulating joint (16); the outer diameter of the step of the step groove close to the second sealing surface (22) is larger than the outer diameter of the step of the step groove close to the pressure regulating joint (16); one end of the kettle body (5) that cooperates with the cylinder body (1) is provided with a through hole that is adapted to the step of the step groove close to the pressure regulating joint (16); the outer wall of the step of the step groove close to the pressure regulating joint (16) is provided with a sealing component 2 (18) that contacts the inner wall of the through hole; the step of the step groove close to the second sealing surface (22) is located in the confining pressure chamber (7) and is clamped with the end of the kettle body (5).

6. An automatic core clamping device according to claim 1, characterized in that: The end of the slider (9) away from the inner rubber sleeve (6) is a cylindrical structure, and the outer wall of the end of the slider (9) away from the inner rubber sleeve (6) is provided with a sealing component four (20) in contact with the inner wall of the confining pressure chamber (7).

7. An automatic core clamping device according to claim 1, characterized in that: The cylinder body (1) is connected to the kettle body (5) via bolts (4).

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