Low-energy-consumption reliability test device for cylinder sleeve and piston of drilling pump

Abstract

The invention discloses a drilling pump cylinder sleeve and piston low-energy-consumption reliability testing device which comprises two cylinder sleeves, a hydraulic cylinder is connected between the two cylinder sleeves, the first cylinder sleeve is connected with a drilling pump, the drilling pump cylinder sleeve and piston rod device sequentially penetrates through the first cylinder sleeve, the hydraulic cylinder and the second cylinder sleeve, and the hydraulic cylinder is provided with a liquid inlet and a liquid outlet which are communicated with the hydraulic cylinder. The first cylinder sleeve, the hydraulic cylinder and the second cylinder sleeve are communicated; the two cylinder sleeves and the pistons are symmetrically arranged on the two sides of the hydraulic cylinder, the opposite space of the two sets of parts is filled with high-pressure liquid, and detection of the service life of the pistons and the cylinder sleeves is achieved through reciprocating motion of the two sets of pistons in a high-pressure cavity along with the middle pull rod. The two pistons are located in the same high-pressure cavity, the pressures are equal in magnitude and opposite in direction and can be just counteracted, a drilling pump does not need to provide strong power to overcome the end face pressure effect, only power capable of overcoming friction force consumption between the two cylinder sleeves and the pistons needs to be provided, and the energy consumption of the cylinder sleeve and piston reliability testing device can be greatly reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of oil and gas drilling, and relates to a low-energy consumption and reliable test device for the cylinder liner and piston of a drilling pump. Background Art

[0002] The drilling pump is known as the "heart" of the oil and gas drilling rig, and provides power for the circulation of the drilling fluid during operation. The important functions of the drilling fluid include: (1) timely removing cuttings and cleaning the bottom of the well to prevent sticking of the drill string; (2) balancing the formation pressure, stabilizing the wellbore, and preventing well collapse, blowout, and leakage; (3) transmitting power to downhole motor drills, assisting the drill bit to break rocks, and improving drilling efficiency; (4) cooling and lubricating the drill bit and drill string, etc. The cylinder liner and piston are one of the most important wearing parts of the drilling pump, and their reliability (or service life) level directly affects the efficiency and safety of oil and gas drilling. Therefore, professional drilling pump manufacturers attach great importance to improving the reliability level of the cylinder liner and piston, and spend a large amount of money on reliability tests;

[0003] The characteristics of the reliability test are that a sufficient number of test samples and a sufficient test time are required, otherwise the test purpose cannot be achieved. At present, each manufacturer generally uses high-power drilling pump products to conduct reliability tests on cylinder liners and pistons. The main disadvantages are: (1) high energy consumption. Taking a commonly used 2200hp drilling pump as an example, its power consumption per hour is about 1640 degrees, and the electricity cost exceeds 2000 yuan; (2) large consumption of fluid medium, and the test device is large in volume and complex in structure. Summary of the Invention

[0004] The purpose of the present invention is to provide a low-energy consumption and reliable test device for the cylinder liner and piston of a drilling pump, which solves the problem of high energy consumption existing in the conventional test device.

[0005] The technical solution adopted by the present invention is that a low-energy consumption and reliable test device for the cylinder liner and piston of a drilling pump includes two cylinder liners, a hydraulic cylinder is connected between the two cylinder liners, the first cylinder liner is connected to the drilling pump, and further includes a piston rod device that sequentially passes through the first cylinder liner, the hydraulic cylinder, and the second cylinder liner. The hydraulic cylinder is provided with a liquid inlet and a liquid outlet communicated with it, and the first cylinder liner, the hydraulic cylinder, and the second cylinder liner are communicated with each other.

[0006] The characteristics of the present invention also lie in:

[0007] Wherein a wear-resistant disc and a cylinder liner flange are sequentially arranged between the first cylinder liner and the drilling pump. The cylinder liner flange is sleeved on the outer side of one end of the first cylinder liner, and a cylinder liner gland is embedded at the connection between the cylinder liner flange and the first cylinder liner;

[0008] Wherein the cylinder liner flange is connected to the drilling pump through stud bolts, and the stud bolts pass through the drilling pump and are connected to the hydraulic cylinder;

[0009] A wear-resistant disc A is provided at the connection between the second cylinder liner and the hydraulic cylinder. A groove matching with the second cylinder liner is provided at the end of the hydraulic cylinder. The side of the wear-resistant disc A away from the hydraulic cylinder is connected to the cylinder liner flange A. The stud passes through the hydraulic cylinder and is connected to the cylinder liner flange A. Nuts matching with the stud are provided at both ends of the stud. One end of the second cylinder liner is embedded in the cylinder liner flange A, and a cylinder liner gland A is provided between the second cylinder liner and the cylinder liner flange A;

[0010] Sealing rings are respectively embedded at one ends of the first cylinder liner and the second cylinder liner extending into the cylinder liner flange and the cylinder liner flange A;

[0011] The piston rod device includes a piston group pull rod extending into the first cylinder liner. One end of the piston group pull rod extending into the first cylinder liner is connected to a piston connecting rod. The two ends of the piston connecting rod are respectively sleeved with a first piston and a second piston. The piston connecting rod passes through the hydraulic cylinder and extends into the second cylinder liner. The first piston is embedded in the first cylinder liner, the second piston is embedded in the second cylinder liner, and the end of the piston group pull rod away from the piston connecting rod is connected to the drilling pump;

[0012] The piston group pull rod is coaxially connected to the piston connecting rod, and piston nuts are provided on the outer sides of the two ends of the piston connecting rod where the first piston and the second piston are located;

[0013] The rubber bell mouths of the first piston and the second piston are arranged oppositely.

[0014] The beneficial effects of the present invention are:

[0015] For the low-energy consumption and reliability test device of the drilling pump cylinder liner and piston of the present invention, during the test, the cylinder liner and the piston are installed in a group in an opposed manner, and the space between the two groups of components is filled with high-pressure liquid. The piston connecting rod is used to bear two piston forces that are equal in magnitude and opposite in direction, converting the powerful piston rod force into internal force of the device, and there is no need to provide additional powerful power to drive the piston under high pressure. In this way, it can not only simulate the working condition of the cylinder liner and the piston under high pressure, but also greatly reduce the kinetic energy consumption in the test. Description of the Drawings

[0016] Figure 1 is a schematic structural diagram of the existing cylinder liner piston test device;

[0017] Figure 2 is a structural diagram of the low-energy consumption and reliability test device of the drilling pump cylinder liner and piston of the present invention;

[0018] Figure 3 is a three-dimensional sectional structural diagram of the low-energy consumption and reliability test device of the drilling pump cylinder liner and piston of the present invention;

[0019] Figure 4 is a three-dimensional structural diagram of the opposed installation of the pistons in the low-energy consumption and reliability test device of the drilling pump cylinder liner and piston of the present invention;

[0020] Figure 5 It is the three-dimensional structure diagram of the hydraulic cylinder in the low-energy consumption and reliable test device for the cylinder liner and piston of the drilling pump of the present invention;

[0021] Figure 6 It is the three-dimensional structure diagram of the piston connecting rod in the low-energy consumption and reliable test device for the cylinder liner and piston of the drilling pump of the present invention;

[0022] Figure 7 It is the three-dimensional structure diagram of the wear-resistant disc in the low-energy consumption and reliable test device for the cylinder liner and piston of the drilling pump of the present invention;

[0023] Figure 8 It is the three-dimensional structure diagram of the cylinder liner flange in the low-energy consumption and reliable test device for the cylinder liner and piston of the drilling pump of the present invention;

[0024] Figure 9 It is the three-dimensional structure diagram of the cylinder liner gland in the low-energy consumption and reliable test device for the cylinder liner and piston of the drilling pump of the present invention.

[0025] In the figure, 1. Hydraulic end assembly, 2. Wear-resistant disc, 3. Cylinder liner flange, 4. Cylinder liner gland, 5. Piston rod, 6. Nut, 7. Stud, 8. Sealing ring, 9. First piston, 10. First cylinder liner, 11. Drilling pump, 12. Piston nut, 13. Hydraulic cylinder, 14. Piston connecting rod, 15. Piston group tie rod, 16. Second cylinder liner, 17. Liquid inlet, 18. Liquid outlet, 19. Wear-resistant disc A, 20. Cylinder liner flange A, 21. Cylinder liner gland A, 22. Second piston. Specific embodiments

[0026] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] The present invention provides a low-energy consumption and reliable test device for the cylinder liner and piston of a drilling pump, as shown in the following embodiments:

[0028] Embodiment 1, the design idea of the low-energy consumption and reliable test device for the cylinder liner and piston of the drilling pump of the present invention is as follows:

[0029] The purpose of the present invention is to provide a low-energy consumption and reliable test device for the cylinder liner and piston of a drilling pump; this device is still installed on a certain drilling pump product for operation, but the actual power consumption is only about one-tenth of the original, as Figure 2 shown, it mainly includes a hydraulic cylinder 13, two bimetallic cylinder liners, and two piston structures that cooperate with the two bimetallic cylinder liners. Among them, the two bimetallic cylinder liners and the two pistons are the objects to be tested;

[0030] As Figure 1As shown, compared with the conventional test device, the low-energy-consumption reliability test device can test two pistons and cylinder liners at a time, and the end face pressures of the two pistons are equal in magnitude and opposite in direction, which can just cancel each other out. There is no need for a drilling pump to provide strong power to overcome the action of the end face pressure, and only the power to overcome the friction consumption between the two cylinder liners and the pistons needs to be provided. Therefore, the energy consumption of the low-energy-consumption test device can be as low as 1 / 5 to 1 / 10 of that of the conventional test device.

[0031] Embodiment 2, the specific structure of the low-energy-consumption reliability test device for the cylinder liner and piston of the drilling pump provided by the present invention is as follows:

[0032] As Figure 3 、 Figure 7 and Figure 8 shown, first, the wear-resistant disc 2 and the wear-resistant disc A19 are symmetrically installed on both sides of the hydraulic cylinder 13. The cylinder liner flange 3 and the cylinder liner flange A20 are respectively connected to the wear-resistant disc 2 and the wear-resistant disc A19. One end of the first cylinder liner 10 and the second cylinder liner 16 are respectively inserted into the cylinder liner flange 3 and the cylinder liner flange A20. Sealing rings 8 are sleeved on the ends of the first cylinder liner 10 and the second cylinder liner 16 inserted into the cylinder liner flange 3 and the cylinder liner flange A20. Then, the cylinder liner gland 4 and the cylinder liner gland A21 are respectively sleeved at their connection positions. The cylinder liner gland 4 and the cylinder liner gland A21 are used to press the first cylinder liner 10 and the second cylinder liner 16 tightly. As Figure 9 shown, the stud 7 passes through the cylinder liner flange 3, the drilling pump 11, the hydraulic cylinder 13 and the cylinder liner flange A20 in sequence, and the two ends of the stud 7 are fastened by nuts 6, that is, the cylinder liner flange 3, the drilling pump 11, the hydraulic cylinder 13 and the cylinder liner flange A20 are fixed in sequence by the stud 7 and the nuts 6. As Figure 5 shown, the hydraulic cylinder 13 is provided with a groove for connecting with the cylinder liner flange, that is, the first cylinder liner 10 and the second cylinder liner 16 are symmetrically arranged with the hydraulic cylinder 13 as the axis of symmetry;

[0033] As Figure 4 and Figure 6 shown, then the piston connecting rod 14, the first piston 9 and the second piston 22 are separately assembled into a whole through the piston nut 12, and are inserted into the inner hole at the end of the second cylinder liner 16 away from the hydraulic cylinder 13, and are pushed all the way to the left until they are connected to the piston group pull rod 15; the piston group pull rod 15 is connected to the middle pull rod and the clamp of the drilling pump 11. When the drilling pump 11 operates, the middle pull rod makes a reciprocating motion, thereby driving the combination of the piston connecting rod 14, the first piston 9 and the second piston 22 to make a reciprocating motion in the first cylinder liner 10, the hydraulic cylinder 13 and the second cylinder liner 16.

[0034] Embodiment 3, the experimental process of the low-energy-consumption reliability test device for the cylinder liner and piston of the drilling pump of the present invention is as follows:

[0035] Above the hydraulic cylinder 13, there is a high-pressure fluid inlet 17, and below it, there is a high-pressure fluid drain outlet 18. The inner cavity of the hydraulic cylinder 13 is filled with the required test pressure by an external low-power power device. That is, an external low-power high-pressure reciprocating pump is used to pump the liquid into the inlet 17 above the hydraulic cylinder 13, and the liquid flows out from the drain outlet 18 (throttle booster hole) below the hydraulic cylinder 13, so as to form a specified test pressure in the inner cavity holes of the hydraulic cylinder 13 and the bimetallic cylinder liner. The combination of the piston connecting rod 14, the first piston 9, the second piston 22, and the piston nut 12 makes reciprocating movements in the high-pressure fluid medium, achieving the purpose of testing the service life of the two vulnerable parts, namely the two pistons and the two bimetallic cylinder liners.

Claims

1. Low - energy - consumption and reliability test device for the cylinder liner and piston of a drilling pump, comprising two cylinder liners. A hydraulic cylinder (13) is connected between the two cylinder liners. The first cylinder liner (10) is connected to the drilling pump (11). Characterized in that, It further includes a piston rod device that sequentially passes through the first cylinder liner (10), the hydraulic cylinder (13), and the second cylinder liner (16). The hydraulic cylinder (13) is provided with a liquid inlet (17) and a liquid outlet (18) communicating with it, and the first cylinder liner (10), the hydraulic cylinder (13), and the second cylinder liner (16) are in communication with each other.

2. The low - energy - consumption and reliability test device for the cylinder liner and piston of a drilling pump according to claim 1, wherein a wear - resistant disc (2) and a cylinder liner flange (3) are sequentially arranged between the first cylinder liner (10) and the drilling pump (11). The cylinder liner flange (3) is sleeved on the outer side of one end of the first cylinder liner (10), and a cylinder liner gland (4) is embedded at the connection between the cylinder liner flange (3) and the first cylinder liner (10).

3. The low - energy - consumption and reliability test device for the cylinder liner and piston of a drilling pump according to claim 2, wherein the cylinder liner flange (3) is connected to the drilling pump (11) through a stud (7), and the stud (7) passes through the drilling pump (11) and is connected to the hydraulic cylinder (13).

4. The low - energy - consumption and reliability test device for the cylinder liner and piston of a drilling pump according to claim 1 or 3, wherein a wear - resistant disc A (19) is provided at the connection between the second cylinder liner (16) and the hydraulic cylinder (13). A groove cooperating with the second cylinder liner (16) is provided at the end of the hydraulic cylinder (13). On the side of the wear - resistant disc A (19) away from the hydraulic cylinder (13), a cylinder liner flange A (20) is connected. The stud (7) passes through the hydraulic cylinder (13) and is connected to the cylinder liner flange A (20). Nuts (6) cooperating with the two ends of the stud (7) are provided. One end of the second cylinder liner (16) is embedded in the cylinder liner flange A (20), and a cylinder liner gland A (21) is provided between the second cylinder liner (16) and the cylinder liner flange A (20).

5. The low - energy - consumption and reliability test device for the cylinder liner and piston of a drilling pump according to claim 4, wherein sealing rings (8) are respectively embedded at one ends of the first cylinder liner (10) and the second cylinder liner (16) that extend into the cylinder liner flange (3) and the cylinder liner flange A (20).

6. The low - energy - consumption and reliability test device for the cylinder liner and piston of a drilling pump according to claim 1, wherein the piston rod device includes a piston group pull rod (15) extending into the first cylinder liner (10). One end of the piston group pull rod (15) extending into the first cylinder liner (10) is connected to a piston connecting rod (14). The two ends of the piston connecting rod (14) are respectively sleeved with a first piston (9) and a second piston (22). The piston connecting rod (14) passes through the hydraulic cylinder (13) and extends into the second cylinder liner (16). The first piston (9) is embedded in the first cylinder liner (10), the second piston (22) is embedded in the second cylinder liner (16), and one end of the piston group pull rod (15) away from the piston connecting rod (14) is connected to the drilling pump (11).

7. The low-energy consumption and reliability test device for the drilling pump cylinder liner and piston according to claim 6, wherein the piston group tie rod (15) is coaxially connected with the piston connecting rod (14), and piston nuts (12) are provided on the outer sides of the two ends of the piston connecting rod (14) with respect to the first piston (9) and the second piston (22).

8. The low-energy consumption and reliability test device for the drilling pump cylinder liner and piston according to claim 6, wherein the rubber bell mouths of the first piston (9) and the second piston (22) are arranged oppositely.

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