Oilfield exploitation equipment

Abstract

The invention relates to the technical field of oil and gas exploitation, in particular to oilfield exploitation equipment which comprises a power mechanism, a speed reducing mechanism and a plunger pump, and the power input end of the speed reducing mechanism is connected with the output end of the power mechanism; the power end assembly of the plunger pump is connected with the power output end of the speed reducing mechanism, the speed reducing mechanism can be independent of the exterior of the plunger pump, the situation that normal use of the whole plunger pump is affected due to the fact that the speed reducing mechanism is abnormal is avoided, and the use reliability of the plunger pump is improved.

Description

Technical Field

[0001] The present application relates to the technical field of oil and gas exploitation, and in particular to an oilfield exploitation device. Background Art

[0002] At present, in the structural design of cementing equipment and fracturing equipment, common power source drive forms include diesel engine drive, motor drive, and turbine engine drive. Since diesel engines, motors, and turbine engines all have high speeds, the output power source still needs to be equipped with a reduction mechanism on the plunger pump for further speed reduction and torque increase after the speed reduction and torque increase of the reduction box. The reduction mechanism on the plunger pump is the key part of the plunger pump, and it is also the part where abnormalities occur more frequently. When the reduction mechanism is abnormal, the entire plunger pump cannot be used normally, affecting the reliability of the plunger pump. Summary of the invention

[0003] The purpose of the present application is to provide an oilfield production equipment, which can separate the speed reduction mechanism from the outside of the plunger pump, thereby avoiding the situation where the normal use of the entire plunger pump is affected by abnormalities in the speed reduction mechanism and improving the reliability of the plunger pump.

[0004] To this end, an embodiment of the present application provides an oilfield extraction equipment, including: a power mechanism; a reduction mechanism, the power input end of the reduction mechanism is connected to the output end of the power mechanism; and a plunger pump, the power end assembly of the plunger pump is connected to the power output end of the reduction mechanism.

[0005] In a possible implementation, the power mechanism is a diesel engine, and the maximum reduction ratio of the reduction mechanism is 20-25:1.

[0006] In a possible implementation, the power mechanism is a motor, and the maximum reduction ratio of the reduction mechanism is 12-15:1.

[0007] In a possible implementation, the power mechanism is a turbine engine, and the maximum reduction ratio of the reduction mechanism is 10-12:1.

[0008] In one possible implementation, the power end assembly of the plunger pump includes: a housing; a crankshaft rotatably disposed in the housing; a drive shaft passing through the housing and connected to the crankshaft; and a drive flange connected to the drive shaft, the drive flange being used to connect to the power output end of the reduction mechanism.

[0009] In a possible implementation, a positioning groove is provided at one end of the crankshaft facing the drive shaft, and a positioning boss is provided at one end of the drive shaft along the axial direction. The positioning boss is positioned in the positioning groove, and the positioning boss is connected to the crankshaft by bolts.

[0010] In a possible implementation, a first positioning hole is circumferentially arranged in the positioning groove, a second positioning hole is circumferentially arranged on the positioning boss, and the power end assembly further includes a positioning pin for connecting the first positioning hole and the second positioning hole.

[0011] In one possible implementation, a side cover is provided at one end of the shell adjacent to the drive shaft, a through hole is provided on the side cover, the drive shaft passes through the through hole, the drive shaft has a sealing portion located in the through hole, and a power end assembly is provided on the drive shaft, which also includes a sealing component for sealing the sealing portion and the through hole.

[0012] In one possible implementation, the sealing assembly includes: an oil seal seat fixed to the side cover by bolts; an oil seal disposed in the oil seal seat, the oil seal abutting against the sealing portion of the drive shaft; and a sealing gasket disposed between the oil seal seat and the side cover.

[0013] In a possible implementation, the drive shaft is connected to the drive flange via a keyway, and a pressure cover for limiting the drive flange is provided at one end of the drive shaft adjacent to the drive flange.

[0014] According to the oilfield extraction equipment provided in the embodiment of the present application, the oilfield extraction equipment outputs power through a power mechanism, and a reduction mechanism reduces the speed and increases the torque of the power output by the power mechanism, and then outputs the power after the reduction in speed and the increase in torque to a power end assembly of a plunger pump for driving the plunger pump to work. By making the reduction mechanism independent of the outside of the plunger pump, it is possible to avoid the situation where an abnormality of the reduction mechanism affects the normal use of the entire plunger pump, thereby improving the reliability of the use of the plunger pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In addition, in the drawings, the same components are marked with the same reference numerals, and the drawings are not drawn according to the actual scale.

[0016] Figure 1 A schematic diagram of the three-dimensional structure of a plunger pump provided in an embodiment of the present application is shown;

[0017] Figure 2 A schematic diagram showing a connection structure of an oilfield production equipment provided by an embodiment of the present application is shown;

[0018] Figure 3 A schematic diagram of an explosion structure of a plunger pump provided in an embodiment of the present application is shown;

[0019] Figure 4A cross-sectional view of a power end assembly provided in an embodiment of the present application is shown;

[0020] Figure 5 Show Figure 4 The schematic diagram of the partial enlarged structure of the power end assembly at the drive shaft is shown;

[0021] Figure 6 A schematic cross-sectional structure diagram of a plunger pump provided in an embodiment of the present application is shown;

[0022] Figure 7 A schematic diagram of the three-dimensional structure of a drive shaft provided in an embodiment of the present application is shown.

[0023] Description of reference numerals:

[0024] 1. Power mechanism;

[0025] 2. Speed ​​reduction mechanism;

[0026] 3. Piston pump; 31. Power end assembly; 311. Housing; 3111. Side cover; 312. Crankshaft; 3121. Positioning groove; 3122. First positioning hole; 313. Drive shaft; 3131. Positioning boss; 3132. Second positioning hole; 3133. Sealing part; 314. Drive flange; 315. Positioning pin; 316. Sealing assembly; 3161. Oil seal seat; 3162. Oil seal; 3163. Sealing gasket; 317. Gland; 318. Crank-connecting rod mechanism; 32. Hydraulic end assembly; 321. Valve box; 322. Suction end; 323. Discharge end; 324. Pipeline; 325. Plunger; 33. Lubrication system assembly. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0028] Figure 1 A schematic diagram of the three-dimensional structure of a plunger pump provided in an embodiment of the present application is shown; Figure 2 A schematic diagram showing a connection structure of an oilfield production equipment provided by an embodiment of the present application is shown; Figure 3 A schematic diagram of an explosion structure of a plunger pump provided in an embodiment of the present application is shown; Figure 4 A cross-sectional view of a power end assembly provided in an embodiment of the present application is shown; Figure 5 Show Figure 4The schematic diagram of the partial enlarged structure of the power end assembly at the drive shaft is shown; Figure 6 A schematic cross-sectional structure diagram of a plunger pump provided in an embodiment of the present application is shown; Figure 7 A schematic diagram of the three-dimensional structure of a drive shaft provided in an embodiment of the present application is shown.

[0029] like Figures 1 to 7 As shown, an embodiment of the present application provides an oilfield extraction equipment, including: a power mechanism 1; a reduction mechanism 2, the power input end of the reduction mechanism 2 is connected to the output end of the power mechanism 1; and a plunger pump 3, the power end assembly 31 of the plunger pump 3 is connected to the power output end of the reduction mechanism 2.

[0030] In the present application, power is output through the power mechanism 1, and the reduction mechanism 2 reduces the speed and increases the torque of the power output by the power mechanism 1, and then outputs the power after the reduction in speed and the increase in torque to the power end assembly 31 of the plunger pump 3, so as to drive the plunger pump 3 to work. By making the reduction mechanism 2 independent of the outside of the plunger pump 3, the situation in which the abnormality of the reduction mechanism 2 affects the normal use of the entire plunger pump 3 is avoided, thereby improving the reliability of the use of the plunger pump 3.

[0031] In the related art, the existing plunger pump 3 will be provided with a reduction unit at one end of the power end assembly 31. For example, in the case of a traditional diesel engine drive, the structure is that the diesel engine is connected to the gearbox to drive the plunger pump 3 to run, and a reduction unit is provided at the power end assembly 31 of the plunger pump 3 to connect the gearbox, and there are two reduction mechanisms 2 (gearbox and reduction unit of the power end assembly 31) in the whole transmission system; another example is a traditional motor drive, the structure is that the motor is directly connected to the plunger pump 3, and the driven plunger pump 3 will also be provided with a reduction unit at the power end assembly 31, and there is a reduction mechanism 2 in the whole electric drive equipment, and the reduction mechanism 2 is provided at the power end assembly 31 of the plunger pump 3; another example is a turbine engine drive, the structure is that the turbine engine is connected to a high-speed reduction box to drive the plunger pump 3 to run, and the traditional plunger pump 3 will also have its own reduction unit in the power end assembly 31, and there are two reduction mechanisms 2 (high-speed reduction box and reduction unit of the power end assembly 31) in the whole system. It can be seen that no matter what power source the existing plunger pump 3 relies on, a reduction unit will be provided on the power end assembly 31. The reduction unit is provided on the power end assembly 31 of the plunger pump 3 as a part that is more prone to abnormalities. Once an abnormality occurs, the entire plunger pump 3 will not work properly, affecting the reliability of the plunger pump 3.

[0032] In the present application, the reduction unit at the power end assembly 31 of the plunger pump 3 is separated and combined with an external reduction box to form a reduction mechanism 2. When an abnormality occurs in the reduction mechanism 2, it will not affect the normal use of the plunger pump 3.

[0033] Moreover, since the reduction unit at the power end assembly 31 of the plunger pump 3 is stripped off, the influence of the reduction unit on the lubrication of the plunger pump 3 can be eliminated, the lubricating oil demand of the plunger pump 3 will be greatly reduced, and the specifications of the plunger pump 3 oil tank, oil pump, heat dissipation and other selections can be appropriately reduced, which is more economical; by removing the reduction unit, the load-bearing capacity of the power end assembly 31 is greatly reduced, and the load-bearing safety factor of the power end assembly 31 is higher; by removing the reduction unit, the influence of the vibration of the reduction unit during operation on the entire plunger pump 3 can be eliminated, and the reliability of the operation of the components of the plunger pump 3 is better.

[0034] Compared with the existing plunger pump 3 with a reduction unit, in the present application, the reduction unit on the plunger pump 3 is removed, and the weight and external dimensions of the entire plunger pump 3 are greatly reduced, which is conducive to the lightweight design of the collection equipment and reserves more design space in the whole equipment. At the same time, the reliability of the plunger pump 3 product itself will be higher.

[0035] The power mechanism 1 of oilfield mining equipment generally adopts three power sources, namely: a diesel engine, an electric motor and a turbine engine. The present application sets up three schemes according to the three different power mechanisms 1.

[0036] In some embodiments, the power mechanism 1 is a diesel engine, and the maximum reduction ratio of the reduction mechanism 2 is 20-25:1.

[0037] In the present application, the diesel engine is used as the power mechanism 1, and the output power is decelerated and torque-increased by the speed reduction mechanism 2, wherein the speed reduction mechanism 2 is a combination of the gearbox in the traditional diesel-driven equipment and the speed reduction unit of the traditional plunger pump 3, which can achieve a reduction ratio that is a cumulative reduction ratio that can be achieved by the traditional gearbox and the speed reduction unit in the traditional plunger pump 3 (taking the 2300 type fracturing vehicle as an example, the maximum speed ratio of the traditional gearbox is 3.75. To meet the structural form of the present application, the maximum speed ratio of the speed reduction mechanism 2 needs to reach 3.75*6.353=23.824), and at the same time, the speed reduction and torque increase function is realized, and the speed and torque transmitted to the plunger pump 3 can directly drive the crankshaft 312 of the plunger pump 3 to rotate, without the plunger pump 3 again reducing speed and increasing torque. At the same time, the speed reduction mechanism 2 can also realize the function of shifting gears to meet the needs of diesel-driven equipment operating in different gears. Compared with the diesel-driven equipment with transmission, the diesel engine-driven oilfield mining equipment provided in the embodiment of the present application optimizes the structural layout of the traditional diesel-driven equipment, reduces the redundant design of the whole machine speed reduction mechanism 2, and makes the speed reduction mechanism 2 design more centralized.

[0038] In some embodiments, the power mechanism 1 is a motor, and the maximum reduction ratio of the reduction mechanism 2 is 12-15:1.

[0039] In the present application, the motor is connected to the reduction mechanism 2 to drive the plunger pump 3 without a reduction unit to run. Compared with the traditional electric drive equipment, the structural form disclosed in the embodiment of the present application is to independently process the traditional reduction unit from the traditional plunger pump 3 structure to form a separately designed reduction box. The reduction box is a fixed speed ratio structure, and the speed ratio design value is consistent with the speed ratio of the reduction mechanism 2 in the traditional plunger pump 3. Taking the current 5000 type electric drive equipment as an example, the reduction ratio must reach 13.3:1, and there is no need to design a speed change function. The speed change function is realized by the motor. By removing the reduction unit from the design of the plunger pump 3, compared with the traditional electric drive equipment, the reduction unit is separated from the plunger pump 3 product, and the reduction box is designed separately, the quality risk is shared, and the quality problem of the reduction box is only limited to the reduction box product, which will not affect the use of the plunger pump 3 product, and facilitate the quality control of the whole machine product.

[0040] In some embodiments, the power mechanism 1 is a turbine engine, and the maximum reduction ratio of the reduction mechanism 2 is 10-12:1.

[0041] In the present application, the reduction mechanism 2 is a high-speed ratio reduction box or a high-speed ratio gearbox, and the turbine engine is connected to the reduction mechanism 2 to drive the plunger pump 3 without a reduction unit to operate, wherein the reduction mechanism 2 is a combination of the high-speed ratio reduction box in the traditional turbine drive equipment and the reduction unit in the traditional plunger pump 3, and the achievable speed ratio is the cumulative speed ratio of the traditional high-speed ratio reduction box and the reduction unit in the traditional plunger pump 3. During the actual use of the equipment, if the high-speed ratio reduction box is required to have the function of speed regulation, the high-speed ratio reduction box can be designed as a high-speed ratio gearbox to meet the needs of the turbine drive equipment shifting operation. Compared with the traditional turbine drive equipment, the oilfield mining equipment driven by the turbine engine provided in the embodiment of the present application optimizes the structural layout of the traditional turbine equipment, reduces the redundant design of the reduction mechanism 2 of the whole machine, and makes the design of the reduction mechanism 2 more centralized. In addition, compared with the traditional high-speed ratio reduction box structure, the structural design of the reduction mechanism 2 adds the function of speed regulation to meet the needs of the turbine drive equipment shifting operation.

[0042] In some embodiments, the power end assembly 31 of the plunger pump 3 includes: a housing 311; a crankshaft 312, rotatably disposed in the housing 311; a drive shaft 313, passing through the housing 311 and connected to the crankshaft 312; and a drive flange 314, connected to the drive shaft 313, and the drive flange 314 is used to connect to the power output end of the reduction mechanism 2.

[0043] In the present application, the driving flange 314 is connected to the power output end of the reduction mechanism 2, and the driving flange 314 drives the crankshaft 312 to rotate through the driving shaft 313. The original reduction unit is removed from the power end assembly 31 of the plunger pump 3, so that the reduction mechanism 2 transmits power directly to the crankshaft 312 through the driving flange 314 and the driving shaft 313.

[0044] Specifically, a bearing is provided between the housing 311 and the crankshaft 312 to ensure that the crankshaft 312 can rotate smoothly. The power end assembly 31 also includes a crank-connecting rod mechanism 318, one end of the crank-connecting rod mechanism 318 is connected to the crankshaft 312, and the other end is connected to the plunger 325 through a clamp. The crankshaft 312 converts the rotational power into a reciprocating push-pull force through the crank-connecting rod mechanism 318 to drive the reciprocating motion of the plunger 325, and the plunger 325 is used to control the hydraulic end assembly 32 of the plunger pump 3 to perform hydraulic pumping.

[0045] In some embodiments, a positioning groove 3121 is provided at one end of the crankshaft 312 facing the drive shaft 313, and a positioning boss 3131 is provided at one end of the drive shaft 313 along the axial direction. The positioning boss 3131 is positioned in the positioning groove 3121, and the positioning boss 3131 is connected to the crankshaft 312 by bolts.

[0046] In the present application, the positioning boss 3131 is assembled in the positioning groove 3121 to ensure the coaxiality of the crankshaft 312 and the drive shaft 313. The crankshaft 312 and the positioning boss 3131 are connected by bolts to facilitate the installation and connection of the drive shaft 313 and the crankshaft 312.

[0047] Specifically, the positioning boss 3131 and the crankshaft 312 are connected by a plurality of bolts, and the plurality of bolts are distributed circumferentially around the positioning boss 3131 to ensure the reliability of the connection between the drive shaft 313 and the crankshaft 312 .

[0048] In some embodiments, a first positioning hole 3122 is circumferentially arranged in the positioning groove 3121 , a second positioning hole 3132 is circumferentially arranged on the positioning boss 3131 , and the power end assembly 31 further includes a positioning pin 315 for connecting the first positioning hole 3122 and the second positioning hole 3132 .

[0049] In the present application, the locating pin 315 can be used to locate the drive shaft 313 and the crankshaft 312 on the one hand, and can ensure that when the drive shaft 313 drives the crankshaft 312 to rotate, the locating pin 315 can withstand better shear force and protect the bolts between the drive shaft 313 and the crankshaft 312 from being sheared off.

[0050] In some embodiments, a side cover 3111 is provided at one end of the shell 311 adjacent to the drive shaft 313, and a through hole is provided on the side cover 3111, through which the drive shaft 313 passes, and the drive shaft 313 has a sealing portion 3133 located in the through hole. The drive shaft 313 is provided with a power end assembly 31 which also includes a sealing component 316 for sealing the sealing portion 3133 and the through hole.

[0051] In the present application, one end of the shell 311 is open, and a side cover 3111 is provided at the opening for installing the crankshaft 312 and the bearing. The drive shaft 313 passes through the through hole on the side cover 3111 and is connected to the crankshaft 312, which is used to eliminate all the sealing components 316 of the reduction unit. The sealing component 316 is provided between the sealing portion 3133 of the drive shaft 313 and the through hole of the side cover 3111 to ensure the sealing of the drive shaft 313 passing through the side cover 3111.

[0052] In some embodiments, the sealing assembly 316 includes: an oil seal seat 3161, which is fixed to the side cover 3111 by bolts; an oil seal 3162, which is disposed in the oil seal seat 3161 and abuts against the sealing portion 3133 of the drive shaft 313; and a sealing gasket 3163, which is disposed between the oil seal seat 3161 and the side cover 3111.

[0053] In the present application, the oil seal seat 3161 is fixed to the outside of the side cover 3111 by bolts, and the sealing gasket 3163 is used to ensure the sealing between the oil seal seat 3161 and the side cover 3111. The oil seal 3162 arranged in the oil seal seat 3161 abuts against the outer peripheral surface of the sealing part 3133 of the drive shaft 313 to realize oil sealing, thereby ensuring the sealing between the drive shaft 313 and the housing 311.

[0054] In some embodiments, the driving shaft 313 is connected to the driving flange 314 via a keyway, and a pressure cover 317 for limiting the driving flange 314 is disposed at one end of the driving shaft 313 adjacent to the driving flange 314 .

[0055] In the present application, the driving shaft 313 and the driving flange 314 are connected by a spline or a flat key. The end of the driving shaft 313 away from the positioning boss 3131 is a transmission part. The sealing part 3133 is arranged between the transmission part and the positioning boss 3131. The outer peripheral surface of the transmission part is axially provided with a keyway, which cooperates with the spline on the inner side of the driving flange 314, thereby realizing the connection between the driving flange 314 and the driving shaft 313. It can withstand large torque and ensure the stability of the transmission between the driving flange 314 and the driving shaft 313.

[0056] Specifically, the hydraulic end assembly 32 of the plunger pump 3 includes a valve box 321, a suction end 322 connected to the valve box 321, a discharge end 323 and a pipe 324. The plunger 325 slides back and forth in the pipe 324 to drive the internal space of the valve box 321 to expand and contract. When the internal space of the valve box 321 expands, external liquid enters the valve box 321 through the suction end 322. When the internal space of the valve box 321 decreases, the liquid in the valve box 321 is discharged through the discharge end 323. The suction end 322 and the discharge end 323 of the hydraulic end assembly 32 are respectively provided with Far components, so that the suction end 322 can be unidirectional for liquid inflow and the discharge end 323 can be unidirectional for liquid outflow.

[0057] In the present application, the plunger pump 3 also includes a lubrication system assembly 33, which is externally connected to lubricating oil and transports the lubricating oil to the inside of the power end assembly 31 through pipes and joints, which plays the role of lubricating, dissipating heat, flushing debris, etc. for the power end assembly 31, thereby ensuring the normal operation of the power end assembly 31.

[0058] The oilfield extraction equipment outputs power through a power mechanism 1, and a reduction mechanism 2 reduces the speed and increases the torque of the power output by the power mechanism 1, and then outputs the reduced-speed and increased-torque power to a power end assembly 31 of a plunger pump 3, so as to drive the plunger pump 3 to work. By making the reduction mechanism 2 independent of the outside of the plunger pump 3, it is avoided that an abnormality of the reduction mechanism 2 affects the normal use of the entire plunger pump 3, thereby improving the reliability of the use of the plunger pump 3.

[0059] It should be noted that the phrases "one embodiment", "an embodiment", "an exemplary embodiment", "some embodiments", etc. mentioned in the specification indicate that the described embodiments may include certain features, structures or characteristics, but not every embodiment may include the certain features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when describing certain features, structures or characteristics in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such features, structures or characteristics in conjunction with other embodiments, whether explicitly or not explicitly described.

[0060] It should be easily understood that “on,” “above,” and “over” in the present disclosure should be interpreted in the broadest manner, so that “on” not only means “directly on something,” but also includes the meaning of “on something” with intervening features or layers therebetween, and “above” or “over” not only includes the meaning of “above” or “over,” but also may include the meaning of “above” or “over something” with no intervening features or layers therebetween (i.e., directly on something).

[0061] In addition, spatially relative terms, such as "below," "below," "beneath," "above," "above," etc., may be used herein for ease of description to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation shown in the figures. The device may have other orientations (rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein may likewise be interpreted accordingly.

[0062] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An oilfield production equipment, characterized in that: include: Power mechanism (1); A speed reduction mechanism (2), wherein a power input end of the speed reduction mechanism (2) is connected to an output end of the power mechanism (1); and A plunger pump (3), wherein a power end assembly (31) of the plunger pump (3) is connected to a power output end of the speed reduction mechanism (2).

2. The oilfield production equipment according to claim 1, characterized in that: The power mechanism (1) is a diesel engine, and the maximum reduction ratio of the reduction mechanism (2) is 20-25:

1.

3. The oilfield production equipment according to claim 1, characterized in that: The power mechanism (1) is a motor, and the maximum reduction ratio of the reduction mechanism (2) is 12-15:

1.

4. The oilfield production equipment according to claim 1, characterized in that: The power mechanism (1) is a turbine engine, and the maximum reduction ratio of the reduction mechanism (2) is 10-12:

1.

5. The oilfield production equipment according to any one of claims 1 to 4, characterized in that: The power end assembly (31) of the plunger pump (3) comprises: Housing (311); A crankshaft (312) rotatably disposed in the housing (311); a drive shaft (313) passing through the housing (311) and connected to the crankshaft (312); and A driving flange (314) is connected to the driving shaft (313), and the driving flange (314) is used to connect to the power output end of the speed reduction mechanism (2).

6. The oilfield production equipment according to claim 5, characterized in that: A positioning groove (3121) is provided at one end of the crankshaft (312) facing the drive shaft (313), and a positioning boss (3131) is provided at one end of the drive shaft (313) along the axial direction. The positioning boss (3131) is positioned in the positioning groove (3121), and the positioning boss (3131) is connected to the crankshaft (312) by bolts.

7. The oilfield production equipment according to claim 6, characterized in that: A first positioning hole (3122) is circumferentially arranged in the positioning groove (3121), a second positioning hole (3132) is circumferentially arranged on the positioning boss (3131), and the power end assembly (31) further comprises a positioning pin (315) for connecting the first positioning hole (3122) and the second positioning hole (3132).

8. The oilfield production equipment according to claim 5, characterized in that: A side cover (3111) is provided at one end of the housing (311) adjacent to the drive shaft (313); a through hole is provided on the side cover (3111); the drive shaft (313) passes through the through hole; the drive shaft (313) has a sealing portion (3133) located in the through hole; a power end assembly (31) is provided on the drive shaft (313) and also includes a sealing component (316) for sealing the sealing portion (3133) and the through hole.

9. The oilfield production equipment according to claim 8, characterized in that: The sealing assembly (316) comprises: An oil seal seat (3161) is fixed to the side cover (3111) by bolts; An oil seal (3162) is disposed in the oil seal seat (3161), and the oil seal (3162) abuts against a sealing portion (3133) of the drive shaft (313); and The sealing gasket (3163) is arranged between the oil seal seat (3161) and the side cover (3111).

10. The oilfield production equipment according to claim 8, characterized in that: The driving shaft (313) is connected to the driving flange (314) via a keyway, and a pressure cover (317) for limiting the driving flange (314) is provided at one end of the driving shaft (313) adjacent to the driving flange (314).

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