Performance testing device and method for valve body and valve seat

Abstract

The invention provides a performance testing device and a performance testing method for a valve body and a valve seat, relates to the technical field of oil and gas field equipment testing, and solves the technical problem that a special testing device capable of simulating the real working environment of the valve body and the valve seat in a factory or a laboratory in a low-cost and high-efficiency manner is lacked in the prior art. The device comprises a single-cylinder fluid end assembly, a driver, a transmission mechanism and a liquid container, the driver is connected with the transmission mechanism, the transmission mechanism is connected with the single-cylinder fluid end assembly, the single-cylinder fluid end assembly is placed in the liquid container, a liquid medium is placed in the liquid container, and the single-cylinder fluid end assembly is connected with the transmission mechanism. A valve body to be tested and a valve seat to be tested are placed at a channel opening of the single-cylinder fluid end assembly.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil and gas field equipment testing, in particular to a performance testing device and testing method for a valve body and a valve seat. BACKGROUND

[0002] Since oil was discovered and exploited by human beings, mature exploitation processes and procedures have been formed for oil and gas field exploitation at home and abroad, drilling, fracturing, well cementing and acidizing have become the most common construction processes and procedures for oil and gas field exploitation, and drilling plunger pump, fracturing plunger pump, well cementing plunger pump and acidizing plunger pump are the key components of the exploitation equipment for the four exploitation processes and procedures, which all realize corresponding functions and targets by pumping high-pressure fluid medium into the well. These pumps are powered by diesel engines, and then the power is transmitted to the power end of the plunger pump through a transmission box or a gearbox, and then drives the plunger to move at high speed in a straight line, so as to pump the fluid medium in the liquid end assembly of the liquid end of the plunger pump. As the key components of the fluid medium suction and discharge channel, the valve body with valve rubber and the valve seat collide at high speed in the process of continuous suction and discharge of the fluid medium, and the collision causes the short service life of the valve body and the valve seat. They are therefore consumables in the plunger pump. Due to different geological characteristics, the fluid medium is also very complex, so the service life of the valve body and the valve seat varies greatly.

[0003] At present, the performance of the valve body and the valve seat is verified by directly installing them on large complete operation equipment such as fracturing truck and fracturing skid with high value, and then testing them on site in simulated or real oilfield. This testing method has the following defects: Firstly, the testing cost is extremely high, including not only the purchase or rental cost of large equipment, but also the high fuel cost and personnel organization cost, which is a huge economic burden for the manufacturers of valve body and valve seat; Secondly, the on-site testing period is long, and complex organization and coordination work is needed, resulting in low testing efficiency; Finally, if the test sample fails on site, not only the entire oil field operation may be interrupted, causing huge economic losses, but also potential claim risks exist.

[0004] Therefore, there is a long-term lack of a special testing device in the prior art, which can simulate the real working environment of the valve body and the valve seat in the factory or the laboratory in a low-cost and high-efficiency manner. SUMMARY

[0005] The present application aims to provide a performance testing device and testing method for a valve body and valve seat, so as to solve the technical problem that there is no special testing device in the prior art which can simulate the real working environment of the valve body and valve seat in a factory or laboratory in a low-cost and high-efficiency manner. The preferred technical solutions in the technical solutions provided by the present application can produce the technical effects described below.

[0006] To achieve the above-mentioned object, the present application provides the following technical solutions: The present application provides a performance testing device for a valve body and valve seat, comprising a single-cylinder hydraulic end assembly, a driver, a transmission mechanism and a liquid container, wherein the driver is connected with the transmission mechanism, the transmission mechanism is connected with the single-cylinder hydraulic end assembly, the single-cylinder hydraulic end assembly is placed in the liquid container and liquid medium is placed in the liquid container, and the valve body and valve seat to be tested are placed at the passage opening of the single-cylinder hydraulic end assembly.

[0007] Optionally, a plunger capable of linear motion is arranged in the single-cylinder hydraulic end assembly, one end of the plunger penetrates through the side wall of the liquid container and is connected with the output shaft of the transmission mechanism.

[0008] Optionally, the plunger and the output shaft of the transmission mechanism are connected through a clamp, or the plunger and the output shaft of the transmission mechanism are connected through a shaft coupling.

[0009] Optionally, suction and discharge passage openings are arranged in the single-cylinder hydraulic end assembly, one valve body and valve seat to be tested are placed in each of the suction and discharge passage openings, a suction manifold is connected with the suction passage opening, the suction passage opening is located at the lower end of the discharge passage opening, and the suction manifold is immersed in the liquid medium in the liquid container.

[0010] Optionally, the driver is a motor.

[0011] Optionally, the transmission mechanism comprises, but is not limited to, a groove cam structure, an equal-width cam structure, an equal-diameter cam structure, a main return cam structure or a slider-crank mechanism.

[0012] Optionally, a bearing seat and a shaft sleeve are further included, the output shaft of the driver extends into the shaft sleeve and is keyed connected with the shaft sleeve, the input shaft of the transmission mechanism extends into the shaft sleeve and is keyed connected with the shaft sleeve, and the shaft sleeve is connected with the bearing seat through a bearing.

[0013] Optionally, the liquid container is an open water tank or a sealed tank body.

[0014] The application provides a performance testing device for a valve body and a valve seat. Step one: install the valve body and the valve seat to be tested into a single-cylinder hydraulic end assembly, wherein a plunger is arranged in the single-cylinder hydraulic end assembly, and the single-cylinder hydraulic end assembly is communicated with a liquid container; Step two: start a driver, and convert the rotary motion output by the driver into reciprocating linear motion of the plunger through a transmission mechanism, so as to drive the plunger to reciprocate in the single-cylinder hydraulic end assembly; Step three: through the reciprocating motion of the plunger, the liquid medium in the liquid container is sucked into and discharged from the single-cylinder hydraulic end assembly, so as to drive the valve body and the valve seat to be tested to perform high-frequency cycle opening and closing.

[0015] The application provides a performance testing device for a valve body and a valve seat. By using low-cost and small-sized standard or simplified components such as an industrial motor, a simple transmission mechanism, a single-cylinder hydraulic end assembly and a liquid container, the expensive, large and complex diesel engine, the transmission box, the multi-cylinder hydraulic end assembly and the manifold system in the prior art are replaced, the manufacturing cost and the operation cost of the testing device are greatly reduced, and the performance testing of the valve body and the valve seat is no longer limited by high equipment cost. In addition, the device structure is compact, and the device can be conveniently deployed and operated in a factory or a laboratory without relying on large oilfield equipment and site, the testing preparation time is short, and the organization and coordination are simple, so that the testing period is significantly shortened, and the testing efficiency is improved. Meanwhile, since the testing is performed in a controlled experimental environment, the operation interruption and the safety risk caused by the testing in an oilfield site are avoided, and the technical problem that there is no special testing device for simulating the real working environment of the valve body and the valve seat in a low-cost and high-efficiency manner in a factory or a laboratory in the prior art is solved.

[0016] The preferred technical scheme of the application can at least produce the following technical effects: The application provides an economic, reliable and efficient testing means for the research and development, design optimization and quality control of the valve body and the valve seat. The researchers can use the device to quickly verify the design effect of new materials and new structures, and accelerate product iteration. The manufacturers can use the device to perform quality sampling inspection before product delivery, so as to effectively improve the overall performance and service life of the valve body and the valve seat, and promote the technical progress of the entire industry.

[0017] The performance testing device is suitable for performance testing of the valve body and the valve seat of a plunger pump on an oil and gas field fracturing, cementing and acidizing construction process device, in detail, is suitable for performance testing of the valve body and the valve seat of a fracturing plunger pump, a cementing plunger pump and an acidizing plunger pump, and is a device for performance testing of oil and gas field equipment accessories. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without any creative effort.

[0019] Figure 1 is a structural schematic view of a performance testing device for a valve body and a valve seat provided by an embodiment of the present application; Figure 2 is a front view of a performance testing device for a valve body and a valve seat provided by an embodiment of the present application; Figure 3 is a sectional view of a single-cylinder hydraulic end assembly of a performance testing device for a valve body and a valve seat provided by an embodiment of the present application; Figure 4 is a structural schematic view of a groove cam structure of a performance testing device for a valve body and a valve seat provided by an embodiment of the present application; Figure 5 is a structural schematic view of an equal-width cam structure of a performance testing device for a valve body and a valve seat provided by an embodiment of the present application; Figure 6 is a structural schematic view of an equal-diameter cam structure of a performance testing device for a valve body and a valve seat provided by an embodiment of the present application; Figure 7 is a structural schematic view of a main return cam structure of a performance testing device for a valve body and a valve seat provided by an embodiment of the present application; Figure 8 is a structural schematic view of a crank slider mechanism of a performance testing device for a valve body and a valve seat provided by an embodiment of the present application; Figure 9 is a structural schematic view of a fracturing truck in the prior art; Figure 10 is an exploded view of a fracturing pump in the prior art.

[0020] In the figure, 1 is a single-cylinder hydraulic end assembly; 11 is a plunger; 12 is an intake passage port; 13 is a discharge passage port; 14 is a pressure gauge; 2 is a driver; 3 is a transmission mechanism; 4 is a liquid container; 5 is a valve body; 6 is a valve seat; 7 is a clamp; 8 is a bearing seat; 9 is a shaft sleeve; 10 is a diesel engine; 20, transmission case; 30, fracturing pump; 301, power end assembly; 302, multi-cylinder fluid end assembly. DETAILED DESCRIPTION

[0022] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described in detail below. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of protection of the present application.

[0023] In the description of the present application, it should be noted that, unless otherwise specified, the meaning of "a plurality of" is two or more; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only for descriptive purposes, and cannot be understood as indicating or implying relative importance.

[0024] In the description of the present application, it should also be noted that, unless otherwise specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0025] Referring to Figure 9 is a structural schematic diagram of a prior art trailer-mounted fracturing truck, which can facilitate viewing of various functional modules, Figure 9 which has a truck head and a trailer chassis, and the chassis is provided with a fan, a diesel engine 10, a transmission case 20 or a gearbox, and a fracturing pump 30. Power is transmitted to the fracturing pump 30 through the diesel engine 10 to realize oilfield fracturing operations. Referring to Figure 10 is an exploded view of a fracturing pump in the prior art, Figure 10 which has a power end assembly 301 and a multi-cylinder fluid end assembly 302, and the fracturing pump is usually of a three-cylinder structure and a five-cylinder structure, Figure 9The middle diesel engine 10 transmits power to the power end assembly 301 of the fracturing pump 30, and transmits power to the plunger of the multi-cylinder hydraulic end assembly 302 through the pull rod of the power end assembly 301. Figure 9 and Figure 10 The present application is directly used for fracturing operation in oil and gas fields, and can also test the performance of the valve body and the valve seat. If the fracturing truck and the fracturing pump are used only for testing the performance of the valve body and the valve seat, the test cost of using large equipment will be high, and it is not suitable for manufacturers to test the valve body and the valve seat.

[0026] Therefore, the present application provides a performance testing device for the valve body and the valve seat, which has simple structure and low cost, can effectively simulate the working state of the valve body 5 and the valve seat 6 under the high-frequency opening and closing working condition in the factory or the laboratory, and comprises a single-cylinder hydraulic end assembly 1, a driver 2, a transmission mechanism 3 and a liquid container 4. The driver 2 is connected with the transmission mechanism 3, the transmission mechanism 3 is connected with the single-cylinder hydraulic end assembly 1, the single-cylinder hydraulic end assembly 1 is placed in the liquid container 4, liquid medium is placed in the liquid container 4, and the valve body 5 and the valve seat 6 to be tested are placed at the passage opening of the single-cylinder hydraulic end assembly 1. The performance testing device for the valve body and the valve seat provided by the present application uses industrial motors, simple transmission mechanisms 3, single-cylinder hydraulic end assemblies 1 and liquid containers 4 and other low-cost, small-sized standard or simplified components to replace the expensive, large and complex diesel engine 10, transmission box 20, multi-cylinder hydraulic end assembly 302 and manifold system in the prior art, so that the manufacturing cost and the operation cost of the testing device are greatly reduced, and the performance testing of the valve body 5 and the valve seat 6 is no longer limited by high equipment cost. In addition, the device structure is compact, and the device can be conveniently deployed and operated in the factory or the laboratory without relying on large oil field equipment and site, so that the test preparation time is short, the organization and coordination are simple, the test period is significantly shortened, and the test efficiency is improved. At the same time, since the test is carried out in a controlled experimental environment, the operation interruption and safety risk caused by the test in the oil field site are avoided, and the technical problem that there is no special testing device for simulating the real working environment of the valve body and the valve seat in the factory or the laboratory in a low-cost and high-efficiency manner in the prior art is solved.

[0027] As an optional implementation, the single-cylinder hydraulic end assembly 1 is provided with a plunger 11 capable of linear motion. The plunger 11 is a core execution component for realizing liquid pumping, and one end of the plunger 11 penetrates through the side wall of the liquid container 4 and is connected with the output shaft of the transmission mechanism 3.

[0028] As an optional embodiment, the plunger 11 is connected with the output shaft of the transmission mechanism 3 through the clamp 7, which can realize detachable connection and provide convenience for the installation and replacement of the plunger 11; or the plunger 11 is connected with the output shaft of the transmission mechanism 3 through a shaft coupling.

[0029] As an optional embodiment, the single-cylinder hydraulic end assembly 1 is provided with an intake channel port 12 and an exhaust channel port 13, and each of the intake channel port 12 and the exhaust channel port 13 is provided with a valve body 5 and a valve seat 6 to be tested. The intake channel port 12 is connected with an intake manifold, and the intake channel port 12 is located at the lower end of the exhaust channel port 13. The intake manifold is immersed in the liquid medium in the liquid container 4. Referring to Figure 3 The top of the single-cylinder hydraulic end assembly 1 is provided with a pressure gauge 14 or a plug, and the pressure gauge 14 can be in contact with the valve body 5 in the exhaust channel port 13. The outlet of the exhaust channel port 13 is located at the rear wall of the single-cylinder hydraulic end assembly 1.

[0030] As an optional embodiment, the driver 2 is an electric motor, which can be an industrial three-phase motor.

[0031] As an optional embodiment, the transmission mechanism 3 includes but is not limited to a groove cam structure, an equal-width cam structure, an equal-diameter cam structure, a main return cam structure or a slider-crank mechanism.

[0032] As an optional embodiment, the bearing seat 8 and the shaft sleeve 9 are further included. The output shaft of the driver 2 extends into the shaft sleeve 9 and is keyed to the shaft sleeve 9. The input shaft of the transmission mechanism 3 extends into the shaft sleeve 9 and is keyed to the shaft sleeve 9. The shaft sleeve 9 is connected with the bearing seat 8 through a bearing, so that the driver 2 and the transmission mechanism 3 are more firmly connected and the stability of rotation is ensured. Alternatively, the driver 2 and the transmission mechanism 3 can also be connected through a shaft coupling.

[0033] As an optional embodiment, the liquid container 4 is an open water tank or a sealed tank. During assembly, the entire single-cylinder hydraulic end assembly 1 is fixed inside or above the open water tank, and the intake channel port 12 of the single-cylinder hydraulic end assembly 1 is ensured to be completely immersed below the liquid medium (such as water or a specific test liquid) pre-injected in the open water tank. The outlet of the exhaust channel port 13 of the single-cylinder hydraulic end assembly 1 directly faces the inside of the open water tank, so that the discharged liquid can directly flow back to the open water tank. Such an open design significantly simplifies the pipeline system and reduces manufacturing costs. Alternatively, the intake channel port 12 of the single-cylinder hydraulic end assembly 1 is no longer directly immersed in the liquid, but is connected with the lower outlet of the sealed tank through an intake manifold. At the same time, the outlet of the exhaust channel port 13 of the single-cylinder hydraulic end assembly 1 is connected back to the upper part of the sealed tank through an exhaust manifold, thereby forming a complete and closed liquid circulation loop.

[0034] The application provides a testing method of a performance testing device of a valve body and a valve seat, and comprises the following operation steps: Step one: install the valve body 5 and the valve seat 6 to be tested into the single-cylinder hydraulic end assembly 1, specifically install a pair of valve body 5 and valve seat 6 into the suction passage port 12 and the discharge passage port 13 respectively, and fasten them in place to ensure good sealing, the single-cylinder hydraulic end assembly 1 is provided with a plunger 11, and the single-cylinder hydraulic end assembly 1 is communicated with the liquid container 4, specifically the assembled single-cylinder hydraulic end assembly 1 is fixed on the liquid container 4, and a sufficient amount of liquid medium is injected into the liquid container 4 to ensure that the liquid level is higher than the suction passage port 12; Step two: start the driver 2, and convert the rotary motion output by the driver 2 into reciprocating linear motion of the plunger 11 through the transmission mechanism 3, so as to drive the plunger 11 to reciprocate in the single-cylinder hydraulic end assembly 1; Step three: through the reciprocating motion of the plunger 11, the liquid medium in the liquid container 4 is sucked into and discharged from the single-cylinder hydraulic end assembly 1, so as to drive the valve body 5 and the valve seat 6 to be tested to perform high-frequency cycle opening and closing. Referring to Figure 3 When the plunger 11 moves to the left under the pull of the transmission mechanism 3 (i.e. suction stroke), the volume of the cylinder space of the single-cylinder hydraulic end assembly 1 increases, and a transient negative pressure is formed. Under the joint action of the negative pressure and the liquid static pressure in the open tank, the pressure difference acting on the valve body 5 and the valve seat 6 in the suction passage port 12 overcomes the self-weight or pre-tightening force, and pushes the valve body 5 away from the valve seat 6, so that the valve is opened, and the liquid medium in the open tank is sucked into the cylinder; When the plunger 11 moves to the right under the push of the transmission mechanism 3 (i.e. discharge stroke), the liquid in the cylinder is extruded and the pressure rapidly rises. The pressure first acts on the back of the valve body 5 in the suction passage port 12, and rapidly hits the valve body 5 to the valve seat 6, so as to realize reliable closing. As the plunger 11 continues to advance, the pressure in the cylinder further sharply rises, and when the pressure is sufficient to overcome the resistance of the valve body 5 of the discharge passage port 13, the valve body 5 of the discharge passage port 13 is pushed away, the high-pressure liquid is discharged from the discharge passage port 13, and directly falls back to the open tank.

[0035] The continuous rotation of the driver 2 makes the plunger 11 continuously cycle the above-mentioned suction and discharge strokes, so as to drive the two sets of valve body 5 and valve seat 6 installed in the single-cylinder hydraulic end assembly 1 to perform high-frequency opening and closing hundreds of times per minute. In each closing action, the valve body 5 hits the valve seat 6 at a very high speed, while bearing the scouring of high-pressure fluid. By running the device for a long time (for example, running for millions of cycles), the impact resistance, scouring resistance, fatigue resistance, sealing reliability and anti-aging performance of the sample to be tested under simulated working conditions can be effectively evaluated. During the test or after the test, the performance state of the valve body 5 and the valve seat 6 can be evaluated by observation, measurement or disassembly inspection. The above merely provides the specific implementation of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A performance testing device for a valve body and valve seat, characterized by, It includes a single-cylinder hydraulic end assembly (1), a drive unit (2), a transmission mechanism (3), and a liquid container (4), wherein, The driver (2) is connected to the transmission mechanism (3), the transmission mechanism (3) is connected to the single-cylinder hydraulic end assembly (1), the single-cylinder hydraulic end assembly (1) is placed in the liquid container (4) and the liquid container (4) contains a liquid medium, and the valve body (5) and valve seat (6) to be tested are placed at the channel opening of the single-cylinder hydraulic end assembly (1).

2. The performance testing device for a valve body and valve seat according to claim 1, characterized in that, The single-cylinder hydraulic end assembly (1) is provided with a plunger (11) that can move linearly. One end of the plunger (11) passes through the side wall of the liquid container (4) and is connected to the output shaft of the transmission mechanism (3).

3. The performance testing device for a valve body and valve seat according to claim 2, characterized in that, The plunger (11) is connected to the output shaft of the transmission mechanism (3) via a clamp (7); or the plunger (11) is connected to the output shaft of the transmission mechanism (3) via a coupling.

4. The performance testing device for a valve body and valve seat according to claim 2, characterized in that, The single-cylinder hydraulic end assembly (1) is provided with an intake port (12) and an exhaust port (13). A valve body (5) and a valve seat (6) to be tested are placed in both the intake port (12) and the exhaust port (13). The intake port (12) is connected to an intake manifold. The intake port (12) is located at the lower end of the exhaust port (13). The intake manifold is immersed in the liquid medium in the liquid container (4).

5. The performance testing device for a valve body and valve seat according to claim 1, characterized in that, The driver (2) is a motor.

6. The performance testing device for a valve body and valve seat according to claim 1, characterized in that, The transmission mechanism (3) includes, but is not limited to, a grooved cam structure, an equal-width cam structure, an equal-diameter cam structure, a main return cam structure, or a crank-slider mechanism.

7. The performance testing device for a valve body and valve seat according to claim 1, characterized in that, It also includes a bearing housing (8) and a bushing (9), the output shaft of the driver (2) extends into the bushing (9) and the output shaft of the driver (2) is keyed to the bushing (9), the input shaft of the transmission mechanism (3) extends into the bushing (9) and the input shaft of the transmission mechanism (3) is keyed to the bushing (9), and the bushing (9) is connected to the bearing housing (8) through a bearing.

8. The performance testing device for a valve body and valve seat according to claim 4, characterized in that, The liquid container (4) is an open water tank or a sealed tank.

9. A test method for a performance testing apparatus comprising a valve body and a valve seat as described in any one of claims 1-8, characterized in that, The following steps are included: Step 1: Install the valve body (5) and valve seat (6) to be tested into the single-cylinder hydraulic end assembly (1), wherein a plunger (11) is provided in the single-cylinder hydraulic end assembly (1), and the single-cylinder hydraulic end assembly (1) is connected to the liquid container (4); Step 2: Start the driver (2), and convert the rotational motion output by the driver (2) into the reciprocating linear motion of the plunger (11) through the transmission mechanism (3) to drive the plunger (11) to reciprocate within the single-cylinder hydraulic end assembly (1); Step 3: Through the reciprocating motion of the plunger (11), the liquid medium in the liquid container (4) is drawn in and discharged from the single-cylinder hydraulic end assembly (1), thereby driving the valve body (5) and valve seat (6) to be tested to perform high-frequency cyclic opening and closing.

Images