Anti-eccentric wear fracturing pump

Abstract

This invention discloses a fracturing pump with anti-eccentric wear, comprising a valve box and a plunger. The plunger has a weight-reducing cavity inside, and the hydraulic end of the plunger is slidably disposed within the valve box. It also includes an anti-eccentricity assembly, comprising an anti-eccentricity outer cylinder and an anti-eccentricity inner rod. The anti-eccentricity outer cylinder is sleeved on the outside of the plunger, and one end of the outer cylinder is fixedly connected to the valve box. The inner diameter of the outer cylinder is adapted to the outer diameter of the plunger. One end of the anti-eccentricity inner rod is fixed to the cavity wall of the valve box, and the other end of the inner rod passes through the hydraulic end of the plunger and connects to a limiting slider, which is slidably disposed within the weight-reducing cavity. This invention provides a fracturing pump with anti-eccentric wear, which, through radial limiting inside and outside the plunger, can reduce eccentric wear between the plunger and packing, extending the service life of the packing.

Description

Technical Field

[0001] This invention relates to a fracturing pump that prevents uneven wear. Background Technology

[0002] As a key piece of equipment in fracturing operations, the plunger pump's main function is to convert fracturing fluid with a certain viscosity into high-pressure, high-flow-rate fracturing fluid under normal pressure and inject it into the formation. Therefore, the quality of the plunger pump directly affects the technical level of oil and gas field fracturing operations. Currently, most plunger pumps used for fracturing are reciprocating horizontal multi-cylinder plunger pumps, such as three-cylinder and five-cylinder plunger pumps. To meet the required displacement and pressure, larger diameter and larger size plungers are needed to achieve higher pressure and greater displacement output per pump, thereby reducing the number of equipment required at the well site and lowering equipment costs.

[0003] According to the existing patent authorization announcement number "CN115076092B", a plunger and fracturing pump are provided. By providing a weight reduction cavity in the plunger body, the weight of the plunger body is reduced under the same size. This makes the plunger less likely to tilt downward during movement, thereby reducing the risk of packing wear and extending the service life of the packing.

[0004] However, the uneven wear of the packing is caused by the weight of the plunger itself and the vibration of the plunger caused by high-pressure liquid pulses. This leads to eccentricity between the packing and the plunger. During the reciprocating motion of the plunger, abnormal wear of the packing occurs, which seriously reduces the service life of the packing, increases the maintenance cost of the equipment, and affects the operating efficiency. Summary of the Invention

[0005] The purpose of this invention is to provide a fracturing pump that prevents uneven wear. By radially limiting the plunger inside and outside, it reduces uneven wear between the plunger and the packing, thus extending the service life of the packing.

[0006] To achieve the above objectives, the technical solution of the present invention is to design a fracturing pump with anti-eccentric wear, including a valve box and a plunger. The plunger has a weight-reducing cavity inside. The hydraulic end of the plunger is slidably disposed in the valve cavity of the valve box. The pump also includes an anti-eccentric component, which includes an anti-eccentric outer cylinder and an anti-eccentric inner rod. The anti-eccentric outer cylinder is sleeved on the outside of the plunger. One end of the anti-eccentric outer cylinder is fixedly connected to the valve box, and the inner diameter of the anti-eccentric outer cylinder is adapted to the outer diameter of the plunger. One end of the anti-eccentric inner rod is fixed to the cavity wall of the valve cavity, and the other end of the anti-eccentric inner rod passes through the hydraulic end of the plunger and is connected to a limiting slider. The limiting slider is slidably disposed in the weight-reducing cavity.

[0007] Preferably, the hydraulic end of the plunger is provided with a sealing connector, the sealing connector includes a connecting cavity, the connecting cavity has an axially penetrating rod hole, an axially displaceable anti-wear pressure ring is movably disposed in the connecting cavity, a sealing rubber ring is provided between the anti-wear pressure ring and the hydraulic end of the plunger, and the same anti-deviation inner rod is provided on the connecting cavity, the sealing rubber ring and the anti-wear pressure ring.

[0008] Preferably, the weight-reducing cavity is rectangular, the shape and size of the limiting slider are adapted to the weight-reducing cavity, and the limiting slider has an axially penetrating ventilation hole.

[0009] Preferably, the anti-deviation inner rod is provided with a positioning protrusion at the connection between it and the valve cavity, and the sealing connector is provided with a positioning groove, wherein the positioning protrusion matches the positioning groove.

[0010] Preferably, the power end of the plunger is driven to the power mechanism of the fracturing pump, and the power end of the plunger is provided with a vent hole, which is connected to the weight reduction cavity.

[0011] The advantages and beneficial effects of this invention are as follows: It provides a fracturing pump that prevents uneven wear. Based on the reduction of the overall weight of the plunger by the weight reduction cavity, an anti-displacement component that cooperates with the weight reduction cavity is further provided. The anti-displacement outer cylinder and the anti-displacement inner rod of the anti-displacement component respectively provide radial limit and support for the plunger inside and outside, thereby reducing the phenomenon of uneven wear between the plunger and the packing and extending the service life of the packing. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the present invention.

[0013] Figure 2 This is a schematic diagram showing the disassembled valve box and plunger of the present invention. Implementation

[0014] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solutions of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0015] The specific technical solution of this invention is as follows:

[0016] like Figure 1 and Figure 2 As shown, a fracturing pump with anti-wear features includes a valve box 1 and a plunger 2. The plunger 2 has a weight-reducing cavity 3 inside, and the hydraulic end 4 of the plunger 2 is slidably disposed in the valve cavity 5 of the valve box 1.

[0017] Considering that the plunger 2 moves laterally during use, meaning that the axis of the plunger 2 is not vertical, and given the large weight and diameter of the large-displacement plunger 2, the reason for the packing wear is not only due to the weight of the plunger 2 itself, but also largely due to the vibration of the plunger 2 caused by the high-pressure liquid pulse in the valve box 1. This causes eccentricity between the packing and the plunger 2, resulting in abnormal wear of the packing during the reciprocating motion of the plunger 2. Over time, this leads to premature failure of the packing due to eccentric wear, thus shortening the maintenance cycle and increasing the operating cost of the equipment.

[0018] Based on the above, this embodiment further includes an anti-deviation component, which includes an anti-deviation outer cylinder 6 and an anti-deviation inner rod 7. The anti-deviation outer cylinder 6 is disposed outside the plunger 2, and one end of the anti-deviation outer cylinder 6 is fixedly connected to the valve box 4. The inner diameter of the anti-deviation outer cylinder 6 is adapted to the outer diameter of the plunger 2. One end of the anti-deviation inner rod 7 is fixed to the cavity wall of the valve chamber 4, and the other end of the anti-deviation inner rod 7 passes through the hydraulic end 4 of the plunger 2 and is connected to a limiting slider 8. The limiting slider 8 is slidably disposed within the weight reduction cavity 3. Thus, based on the weight reduction cavity 3 reducing the overall weight of the plunger 2, an anti-deviation component that cooperates with the weight reduction cavity 3 is further provided. The anti-deviation outer cylinder 6 and the anti-deviation inner rod 7 of the anti-deviation component respectively support and limit the inner and outer sides of the plunger 2, reducing the phenomenon of uneven wear between the plunger 2 and the packing, and extending the service life of the packing.

[0019] The hydraulic end 4 of the plunger 2 is provided with a sealing connector 9. The sealing connector 9 includes a connecting cavity 10. The connecting cavity 10 has an axially penetrating rod hole 11. An axially displaceable anti-wear pressure ring 12 is movably disposed in the connecting cavity 10. A sealing rubber ring 13 is provided between the anti-wear pressure ring 12 and the hydraulic end 4 of the plunger 2. The same anti-deviation inner rod 7 is passed through the connecting cavity 10, the sealing rubber ring 13 and the anti-wear pressure ring 12. Based on this, the sealing connector 9 can prevent the high-pressure liquid in the valve box 1 from entering the weight reduction cavity 3 along the anti-deviation inner rod 7. Specifically, during the process of the plunger 2 moving into the valve box 1 to apply pressure, the sealing connector 9 comes into contact with the high-pressure liquid. The high-pressure liquid pushes the anti-wear pressure ring 12 to exert force on the sealing ring 13. Since the connecting cavity 10 surrounds the sealing ring 13, the sealing ring 13 can only deform towards the middle, thereby making the sealing ring 13 and the anti-deviation inner rod 7 fit tightly together to achieve a sealing effect. Therefore, the greater the pressure of the high-pressure liquid, the better the sealing effect of the sealing ring 13.

[0020] The aforementioned weight-reducing cavity 3 is rectangular, and the shape and size of the limiting slider 8 are adapted to the weight-reducing cavity 3. An axially penetrating vent hole 14 is provided on the limiting slider 8. Since the limiting slider 8 is fixedly connected to the cavity wall of the valve cavity 5 via the anti-deviation inner rod 7, and the shape and size of the limiting slider 8 are adapted to the rectangular weight-reducing cavity 3, rotational deviation of the plunger 2 within the valve cavity is prevented, thereby reducing packing wear and extending packing service life. The vent hole 14 on the limiting slider 8 ensures that the limiting slider 8 is not affected by gas pressure when sliding within the weight-reducing cavity 3.

[0021] The anti-deviation inner rod 7 is provided with a positioning protrusion 15 at the connection between it and the valve cavity 5, and the sealing connector 9 is provided with a positioning groove 16. The positioning protrusion 15 matches the positioning groove 16. Based on this, when the plunger 2 is fully inserted into the valve box 1, the sealing connector 9 at the top of the plunger 2 abuts against the inner wall of the valve cavity of the valve box 1, and the positioning protrusion 15 is embedded in the positioning groove 16, thus playing a positioning role.

[0022] The power end 18 of the plunger 2 is connected to the power mechanism 19 of the fracturing pump. The power end 18 of the plunger 2 has a vent 17, which connects to the weight reduction chamber 3. When the temperature of the plunger 2 increases, the pressure inside the weight reduction chamber 3 increases. The pressure difference between the weight reduction chamber 3 and the outside can be balanced through the vent 17, thereby preventing excessive pressure inside the weight reduction chamber 3 from affecting the service life of the plunger 2.

[0023] It should be noted that the specific structure and working principle of the transmission connection between the power mechanism 19 and the power end 18 of the plunger 2 have been disclosed in existing patents in the background art, and will not be elaborated here.

[0024] In use, by setting a weight-reducing cavity 3 inside the plunger 2, the overall weight of the plunger 2 can be reduced, thereby increasing the diameter of the plunger 2 while maintaining the same weight. However, the larger the diameter of the plunger 2, the greater the eccentricity between the packing and the plunger due to the vibration caused by the high-pressure liquid pulse. Therefore, the anti-eccentricity outer cylinder 6 is sleeved on the outside of the plunger 2 to provide radial limiting and support for the outside of the plunger 2. The anti-eccentricity inner rod 7 is set in cooperation with the weight-reducing cavity 3 to provide radial limiting and support for the inside of the plunger 2. Through the cooperation of the inner and outer anti-eccentricity components, the phenomenon of uneven wear between the plunger 2 and the packing is reduced, the service life of the packing is extended, the maintenance cost of the equipment is reduced, and the operating efficiency is guaranteed.

[0025] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A fracturing pump with anti-wear properties, comprising a valve box and a plunger, wherein the plunger has a weight-reducing cavity inside, and the hydraulic end of the plunger is slidably disposed within the valve cavity of the valve box, characterized in that, It also includes an anti-deviation assembly, which includes an anti-deviation outer cylinder and an anti-deviation inner rod. The anti-deviation outer cylinder is sleeved on the outside of the plunger, and one end of the anti-deviation outer cylinder is fixedly connected to the valve box. The inner diameter of the anti-deviation outer cylinder is adapted to the outer diameter of the plunger. One end of the anti-deviation inner rod is fixed to the cavity wall of the valve chamber, and the other end of the anti-deviation inner rod passes through the hydraulic end of the plunger and is connected to a limit slider. The limit slider is slidably disposed in the weight reduction cavity. The hydraulic end of the plunger is provided with a sealing connector, the sealing connector includes a connecting cavity, the connecting cavity has an axially penetrating rod hole, an axially displaceable anti-wear pressure ring is movably provided in the connecting cavity, a sealing rubber ring is provided between the anti-wear pressure ring and the hydraulic end of the plunger, and the same anti-deviation inner rod is provided on the connecting cavity, the sealing rubber ring and the anti-wear pressure ring. The weight-reducing cavity is rectangular, and the shape and size of the limiting slider are adapted to the weight-reducing cavity. An axially penetrating ventilation hole is provided on the limiting slider. The plunger has a vent hole at its power end, which is connected to the weight reduction cavity.

2. The anti-wear fracturing pump according to claim 1, characterized in that, The anti-deviation inner rod is provided with a positioning protrusion at the connection between it and the valve cavity, and the sealing connector is provided with a positioning groove, wherein the positioning protrusion matches the positioning groove.

3. The anti-wear fracturing pump according to claim 2, characterized in that, The power end of the plunger is connected to the power mechanism of the fracturing pump.

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