Confining pressure device of uniaxial compression testing machine for well cementation

Abstract

The utility model relates to the field of petroleum engineering, in particular to a confining pressure device of a uniaxial compression testing machine for well cementation, which comprises a barrel, a base, an inner self-balancing piston, an outer self-balancing piston, an upper balancing part and a lower balancing part, wherein the bottom of the barrel is in threaded connection with the base, and the top of the barrel is detachably provided with an inner self-balancing piston and an outer self-balancing piston arranged outside the inner self-balancing piston in a sleeving mode; wherein the base comprises a first part and a second part; the first part is matched with the bottom of the cavity of the barrel, and the diameter of the second part is smaller than that of the cavity of the barrel; according to the Young modulus testing device, the purpose of testing the Young modulus is achieved by additionally arranging the confining pressure device and the displacement sensor at the same time, and the equipment cost can be greatly reduced while the testing precision is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of petroleum engineering especially, relate to a single axle pressure testing machine's confining pressure device for well cementing. BACKGROUND

[0002] The long-term effective interlayer isolation ability of the cement sheath in the wellbore is the prerequisite for realizing the yield increase of oil and gas field development and the guarantee for the long-term mining life of the oil and gas well, however, the well cementing cement stone is a brittle material, and in the subsequent construction such as pressure test, perforation, fracturing and the like, rupture is prone to occur, and the application of the tough and elastic cement slurry is irresistible.

[0003] And the basic index for evaluating the toughness of the cement slurry is the Young's modulus and the compressive strength, the original two-axle pressure testing machine cannot test the Young's modulus, and there is a pseudo triaxial pressure testing machine in the industry, but the cost of the equipment is very high.

[0004] The existing single-axle and triaxle pressure testing machines can test the Young's modulus and the compressive strength of the material, but the cost of these devices is very high, and it is a heavy burden for general small enterprises. The high price limits the wide application of these advanced testing technologies in small and medium-sized enterprises, therefore, at present, there is an urgent need for an economical and practical confining pressure device for a single-axle pressure testing machine for well cementing. UTILITY MODEL CONTENTS

[0005] The utility model aims at the deficiency in the prior art, and provides a confining pressure device for a single-axle pressure testing machine for well cementing;

[0006] In order to achieve the above-mentioned purpose, the utility model takes the technical scheme that

[0007] The utility model provides a confining pressure device for a single-axle pressure testing machine for well cementing, which comprises a cylinder body, a base, an inner self-balancing piston, an outer self-balancing piston, an upper balancing piece and a lower balancing piece.

[0008] The bottom of the cylinder body is threadedly connected to the base, and the top of the cylinder body is detachably provided with the inner self-balancing piston and the outer self-balancing piston which is sleeved outside the inner self-balancing piston; wherein

[0009] The base comprises a first part and a second part, the first part is matched with the bottom of the cavity of the cylinder body, and the diameter of the second part is smaller than the diameter of the cylinder cavity.

[0010] The outer self-balancing piston is detachably arranged on the outer wall of the inner self-balancing piston, the inner self-balancing piston is provided with a cavity in the axial direction, and the top of the inner self-balancing piston abuts against a pressing block.

[0011] The upper balancing piece is detachably arranged in the cavity, a threaded hole is arranged at the top of the upper balancing piece, the lower balancing piece is detachably arranged at the bottom of the upper balancing piece, the bottom of the upper balancing piece is provided with a micro convex, and the top of the lower balancing piece is provided with a micro groove matched with the micro convex.

[0012] The cylinder body is provided with a liquid inlet channel and a liquid outlet channel.

[0013] Further, the liquid inlet channel is connected with an air inlet valve pipeline, and the liquid outlet channel is connected with a liquid storage tank pipeline through an air outlet valve.

[0014] Further, the outer side of the cylinder body is fixedly provided with a resistance displacement sensor through a clamp, and a measuring end of the resistance displacement sensor is in contact with the bottom of the pressing block.

[0015] Further, the base is provided with a sealing ring at the connection with the cylinder body, and the outer self-balancing piston is provided with a sealing ring at the connection with the cylinder body.

[0016] Further, the first part comprises a first cylinder, a second cylinder fixedly arranged at the bottom of the first cylinder, and a circular plate fixedly arranged at the bottom of the second cylinder.

[0017] The outer surface of the second cylinder is in threaded connection with the bottom of the cylinder body.

[0018] The diameter of the first cylinder is smaller than the diameter of the second cylinder, and the diameter of the second cylinder is smaller than the diameter of the circular plate.

[0019] Further, the second part is in a cylindrical shape.

[0020] Compared with the prior art, the above technical scheme has the following technical effects:

[0021] In conclusion, the pressure test device is economical and convenient to operate, is suitable for uniaxial compression test of materials such as rock and cement stone, and can test Young's modulus by adding a confining pressure device and a displacement sensor, thereby greatly reducing the equipment cost while ensuring the test accuracy. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a sectional view of the utility model;

[0023] Figure 2 is a front view of the utility model;

[0024] Figure 3The utility model discloses a base's axle side structure schematic diagram shows for the utility model;

[0025] The utility model discloses the sign as follows:

[0026] Cylinder, 1, base, 2, inner self-balancing piston, 31, outer self-balancing piston, 32, upper balancing piece, 4, lower balancing piece, 5, first part, 21, second part, 22, liquid inlet channel, 12, liquid outlet channel, 11, clamp, 9, resistance displacement sensor, 7, telescopic rod, 8, briquetting, 6, first cylinder, 211, second cylinder, 212, round plate, 213, core, 10. DETAILED DESCRIPTION

[0027] The specific embodiment of the utility model will be described in detail below.

[0028] Unless otherwise defined, technical or scientific terms used in the claims and specification shall have the meaning commonly understood by one of ordinary skill in the art to which the utility model pertains.

[0029] The "comprising" or similar words used in the utility model patent application specification and claims mean that the object appearing before "comprising" covers the object appearing after "comprising" or its equivalent object, and other objects are not excluded.

[0030] The numerical values mentioned in the utility model include all the values increasing one unit from low to high, and it is assumed that there are at least two units between any lower value and higher value. For example, if it is said that a component quantity or a physical quantity is from 1 to 100, 10 to 90 is better, and 20 to 80 is optimal, it is intended to express that the values such as 5 to 95, 14 to 76, 23 to 67, 32 to 58, 41 to 49 are clearly listed in the specification; for the values less than 1, 0.0001, 0.001, 0.01 or 0.1 are considered to be a suitable unit. The foregoing examples are only illustrative, and in fact, all the numerical value combinations between the lowest value and the highest value listed are considered to be clearly listed in the specification in a similar manner. EMBODIMENT

[0031] The utility model provides a kind of confining pressure device of single-shaft pressure testing machine for well cementation, it include: cylinder 1, base 2, inner self-balancing piston 31, outer self-balancing piston 32, upper balancing piece 4 and lower balancing piece 5;

[0032] Wherein, the bottom of the cylinder 1 is threadedly connected to the base 2, the top of the cylinder 1 is detachably provided with an inner self-balancing piston 31 and an outer self-balancing piston 32 sleeved outside the inner self-balancing piston, and the inner self-balancing piston 31 and the outer self-balancing piston 32 are fastened by bolts.

[0033] The base 2 comprises a first part 21 matched with the bottom of the cavity of the cylinder 1 and a second part 22 with a diameter smaller than that of the cavity of the cylinder 1, wherein the second part 22 is cylindrical;

[0034] The outer self-balancing piston 32 is detachably arranged on the outer wall of the inner self-balancing piston 31, the inner self-balancing piston 31 is provided with a cavity in the axial direction, and the top of the inner self-balancing piston 31 abuts against the pressure block 6;

[0035] The upper balancing piece 4 is detachably arranged in the cavity, the top of the upper balancing piece 4 is provided with a threaded hole, the lower balancing piece 5 is detachably arranged at the bottom of the upper balancing piece 4, the bottom of the upper balancing piece 4 is provided with a micro convex, the top of the lower balancing piece 5 is provided with a micro concave, the micro convex is matched with the micro concave, in actual test, the micro convex is above and the micro concave is below, when pressure is applied, the micro convex and the micro concave can be automatically leveled to realize self-balancing function;

[0036] The cylinder 1 is provided with a liquid inlet channel 12 and a liquid outlet channel 11 on one side.

[0037] The liquid inlet channel 12 is connected with the air inlet valve pipeline, and the liquid outlet channel 11 is connected with the liquid storage tank pipeline through the air outlet valve.

[0038] The outer side of the cylinder 1 is fixedly provided with a resistance displacement sensor 7 through a clamp 9, and the measuring end 8 of the resistance displacement sensor 7 is in contact with the bottom of the pressure block 6.

[0039] The connection between the base 2 and the cylinder 1 is sleeved with a sealing ring, the connection between the outer self-balancing piston 32 and the cylinder 1 is sleeved with a sealing ring, and the connection between the base 2 and the cylinder 1 is connected through bolts.

[0040] The first part 21 comprises a first cylinder 211, a second cylinder 212 fixedly arranged at the bottom of the first cylinder 211, and a circular plate 213 fixedly arranged at the bottom of the second cylinder 212.

[0041] The outer surface of the second cylinder 212 is threadedly connected with the bottom of the cylinder 1.

[0042] The diameter of the first cylinder 211 is smaller than that of the second cylinder 212, and the diameter of the second cylinder 212 is smaller than that of the circular plate 213.

[0043] In use, the core 10 with a diameter of 25mm is placed on the base 2, the bottom of the cylinder 1 is installed on the base 2 and the bolt is tightened, the lower balancing piece 5, the upper balancing piece 4, the inner self-balancing piston 31 and the outer self-balancing piston 32 are sequentially installed on the top of the cylinder 1, the cylinder 1 and the base are integrated, a closed cavity is formed in the cylinder 1, a confining pressure chamber is obtained, the liquid inlet channel 12 and the liquid outlet channel 11 are formed on one side of the cylinder 1, the liquid inlet channel 12 is connected with the air inlet valve pipeline, the liquid outlet channel 11 is connected with the liquid storage tank pipeline through the air outlet valve, wherein the liquid inlet in the confining pressure chamber shares the liquid inlet channel 12 with the air inlet, the liquid outlet in the confining pressure chamber shares the liquid outlet channel 11 with the air outlet, the liquid inlet or the air inlet can be carried out by opening the air inlet valve, the liquid outlet and the air outlet can be carried out by opening the air outlet valve, wherein the resistance displacement sensor 7 is fixedly arranged on one side of the outside of the cylinder 1 through the clamp 9, when the pressing block 6 is pressed downward, the resistance displacement sensor 7 measures the displacement change of the bottom of the pressing block 6 through the measuring end 8, so as to record the axial strain of the core 10.

[0044] In conclusion, the pressure test device is economic and convenient to operate, is suitable for uniaxial compression test of materials such as rock and cement stone, and can test Young's modulus by adding a confining pressure device and a displacement sensor, and can greatly reduce equipment cost while ensuring test accuracy.

[0045] The above only describes the preferred embodiments of the utility model, and does not limit the implementation and protection scope of the utility model, and those skilled in the art should realize that any equivalent replacement and obvious change obtained by applying the content of the utility model specification and drawings should be included in the protection scope of the utility model.

Claims

1. A confining pressure device for a single-axis press testing machine for cementing, characterized by, The utility model relates to a self-balanced piston pump, comprising: a cylinder (1), a base (2), an inner self-balancing piston (31), an outer self-balancing piston (32), an upper balancing piece (4), and a lower balancing piece (5); wherein the bottom of the cylinder (1) is threadedly connected to the base (2), and the top of the cylinder (1) is detachably provided with the inner self-balancing piston (31) and the outer self-balancing piston (32) which is sleeved outside the inner self-balancing piston; wherein the base (2) comprises a first part (21) and a second part (22); the first part (21) matches the bottom of the cavity of the cylinder (1), and the diameter of the second part (22) is smaller than that of the cavity of the cylinder (1); the outer self-balancing piston (32) is detachably surrounded on the outer wall of the inner self-balancing piston (31), the inner self-balancing piston (31) is provided with a cavity in the axial direction, and the top of the inner self-balancing piston (31) abuts against a pressing block (6); the upper balancing piece (4) is detachably arranged in the cavity, the top of the upper balancing piece (4) is provided with a threaded hole, the lower balancing piece (5) is detachably arranged at the bottom of the upper balancing piece (4), the bottom of the upper balancing piece (4) has a micro convex, the top of the lower balancing piece (5) has a micro concave, and the micro convex matches the micro concave; one side of the cylinder (1) is provided with a liquid inlet channel (12) and a liquid outlet channel (11).

2. The confining pressure device for a single-axis pressure testing machine for cementing wells according to claim 1, characterized in that, The liquid inlet channel (12) is connected with an air inlet valve pipeline, and the liquid outlet channel (11) is connected with a liquid storage tank pipeline through an air outlet valve.

3. The confining pressure device for a single-axis press testing machine for cementing wells according to claim 1, characterized by One side of the outer part of the cylinder (1) is fixedly provided with a resistance displacement sensor (7) through a clamp (9), and the measuring end (8) of the resistance displacement sensor (7) is in contact with the bottom of the pressing block (6).

4. The confining pressure device for a single-axis press testing machine for cementing wells according to claim 1, characterized by A sealing ring is sleeved at the connection between the base (2) and the cylinder (1), and a sealing ring is sleeved at the connection between the outer self-balancing piston (32) and the cylinder (1).

5. The confining pressure device for a single-axis press testing machine for cementing wells according to claim 1, characterized by The first part (21) comprises a first cylinder (211), a second cylinder (212) fixedly arranged at the bottom of the first cylinder (211), and a circular plate (213) fixedly arranged at the bottom of the second cylinder (212); wherein the outer surface of the second cylinder (212) is threadedly connected to the bottom of the cylinder (1); wherein the diameter of the first cylinder (211) is smaller than that of the second cylinder (212), and the diameter of the second cylinder (212) is smaller than that of the circular plate (213).

6. The confining pressure device for a single-axis press testing machine for cementing wells according to claim 1, characterized by The second part (22) is cylindrical.

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