Integrated corrosion-proof pumping device of sucker rod and oil pump

Abstract

This utility model discloses an integrated anti-corrosion oil extraction device combining a sucker rod and an oil pump, comprising an oil pump and multiple sucker rods. The oil pump includes a pump barrel assembly and a plunger assembly. The pump barrel assembly includes a pump barrel, and the plunger assembly includes a plunger. Each sucker rod has a rod body and a rod head. Adjacent sucker rods are connected by couplings between their rod heads. The upper sucker rod among the multiple sucker rods is connected to a polished sucker rod, which has a polished rod body and a polished rod head. The outer surface of the sucker rod is coated with an epoxy resin anti-corrosion layer, and the outer surface of the rod head is coated with a nickel-based alloy anti-corrosion layer. The outer surfaces of both the polished rod body and the polished rod head of the polished sucker rod are coated with a nickel-based alloy anti-corrosion layer, or the polished sucker rod is entirely made of stainless steel. The outer surfaces of the couplings and the plungers are coated with a nickel-based alloy anti-corrosion layer. The inner surface of the pump barrel is coated with a multi-element wear-resistant anti-corrosion layer. This utility model exhibits excellent corrosion resistance and wear resistance overall.

Description

Technical Field

[0001] This utility model relates to an oil extraction device, specifically to an integrated corrosion-resistant oil extraction device that combines a sucker rod and an oil pump. Background Technology

[0002] Sucker rods, polished sucker rods, couplings, and the pump are key components of rod-pumped oil wells, playing a crucial role in rod pump lifting. In conventional rod-pumped oil well operations, the tubular pump assembly is typically lowered along with the tubing to the designed oil layer depth. Then, the plunger assembly is connected to the sucker rod string and lowered into the pump. In the sucker rod string used in oil wells, the uppermost rod connected to the pumping unit is the polished sucker rod. The lower sucker rods are connected sequentially via couplings to form the sucker rod string. The last sucker rod in the string connects to the plunger assembly of the pump. During pumping, the pumping unit drives the plunger assembly in a reciprocating linear motion within the pump barrel via the sucker rod string, drawing well fluid.

[0003] As some oilfields enter the middle and late stages of development, the water content and salinity of the downhole environment continue to increase, leading to intensified corrosion of sucker rods, polished rods, couplings, and pumps. Simultaneously, a significant number of pumping wells contain water in their well fluids, and some wells also contain brine, CO2, H2S, and Cl-. - Sulfate-reducing bacteria, corrosive microorganisms, etc. During their reciprocating motion, these components are subjected to CO2, H2S, Cl-, etc., from the well fluid. - Corrosion caused by sulfate-reducing bacteria, water, and other comprehensive corrosive agents will cause these components to fail after a period of use, greatly reducing their service life. This will eventually lead to the breakage of sucker rods and polished rods, corrosion and breakage of couplings, pump barrels and plungers of the oil pump, corrosion and leakage of the oil pump friction pairs, increasing the frequency of operation and operating costs, and reducing service life.

[0004] In addition, for rod-operated pumping systems, most oil wells use conventional whole-tube pumps. During operation, the tubing is filled with well fluid. Every time a tube is pulled out, a large amount of well fluid splashes everywhere. Some of the well fluid flows into the annulus, while most of it flows into the well site. This not only causes crude oil loss and increases wastewater treatment costs, but also pollutes the environment, making the well site working environment harsh, increasing the difficulty and safety risks of well workover operations, and also increasing environmental protection costs. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide an integrated anti-corrosion oil pumping device that combines a sucker rod and an oil pump. The main components of this utility model have good anti-corrosion and wear-resistant properties.

[0006] To solve the above-mentioned technical problems, this utility model provides an integrated anti-corrosion oil pumping device combining a sucker rod and a sucker pump, comprising an oil pump and multiple sucker rods. The sucker pump includes a pump barrel assembly, a plunger assembly, and a fixed valve assembly. The pump barrel assembly includes an upper pump barrel connector and a pump barrel. The plunger assembly includes an upper outlet connector and a plunger. The fixed valve assembly includes a fixed valve cover, a fixed valve ball, a fixed valve seat, and a fixed lower valve connector. Each sucker rod has a rod body and a rod head. Adjacent sucker rods are connected by couplings between their rod heads. Some sucker rods have spaced-apart stabilizers on their rod bodies. The rod head of the lower sucker rod is connected to the upper outlet connector. The oil fitting is connected to an upper sucker rod among multiple sucker rods, which is connected to a polished sucker rod. The polished sucker rod has a polished rod body and a polished rod head. The rod head of the upper sucker rod is also connected to the polished rod head via the aforementioned coupling. The sucker rod is characterized by: an epoxy resin anti-corrosion layer sprayed on the outer surface of its outer rod body; a nickel-based alloy anti-corrosion layer sprayed on the outer surface of both the polished rod body and the polished rod head; or the polished sucker rod is entirely made of stainless steel; a nickel-based alloy anti-corrosion layer sprayed on the outer surface of the coupling and the outer surface of the plunger; and a wear-resistant and anti-corrosion layer co-permeated on the inner surface of the pump barrel.

[0007] The integrated anti-corrosion oil extraction device with the above-described structure, which combines the sucker rod and the oil pump, has significantly improved overall corrosion resistance and wear resistance due to the presence of anti-corrosion or wear-resistant anti-corrosion layers on key components such as the sucker rod, the polished sucker rod, the plunger of the oil pump, and the pump barrel. This extends the service life of the device. Furthermore, the polished sucker rod in this device can be made entirely of stainless steel, which also provides excellent wear and corrosion resistance.

[0008] As an improvement of this utility model, the fixed valve cover of the fixed valve assembly is provided with a stepped hole, and a drain plug that is sealed to the stepped hole is screwed in. One end of the drain plug extends into the fixed valve cover. A blind hole with the open end facing outward is drilled in the drain plug. A circumferential groove is machined on the outer wall of the drain plug located in the fixed valve cover. When the drain plug breaks at the groove, the rod tube annulus and the oil sleeve annulus can be connected.

[0009] The integrated anti-corrosion oil pumping device with the above-described structure for the sucker rod and pump is designed such that during pump inspection, the sucker rod and the plunger assembly connected to it are first removed, and then a special impact rod is inserted from the pump port. When the impact rod reaches the fixed valve assembly and contacts the drain plug, the drain plug can break through the groove under the impact force of the falling impact rod. At this time, the rod tube annulus and the casing annulus are connected, and the well fluid in the tubing flows into the casing annulus and drains into the well, preventing it from being carried to the surface, thus achieving the purpose of clean production. Attached Figure Description

[0010] The present invention will now be described in further detail with reference to the accompanying drawings.

[0011] Figure 1 This is a cross-sectional structural schematic diagram of an integrated anti-corrosion oil pumping device that combines a sucker rod and an oil pump according to this utility model.

[0012] Figure 2 For easier viewing Figure 1 The angles of the structure at various points, along Figure 1 AA, BB, CC, DD lines Figure 1 The diagram shows the structure of a self-controlled, high-efficiency, environmentally friendly, sand-proof oil pump with a pump barrel broken into five parts.

[0013] Figure 3 This is a schematic diagram of the sucker rod in this utility model.

[0014] Figure 4 yes Figure 3 The diagram shows an enlarged cross-sectional view of the sucker rod.

[0015] Figure 5 yes Figure 3 The diagram shows an enlarged cross-sectional view of the rod head in the sucker rod.

[0016] Figure 6 This is a schematic diagram of the structure of the oil extraction rod in this utility model.

[0017] Figure 7 yes Figure 6 The diagram shows an enlarged cross-sectional view of the polished rod in the sucker rod.

[0018] Figure 8 This is a cross-sectional structural diagram of the coupling in this utility model.

[0019] Figure 9 yes Figure 8 Enlarged schematic diagram of the structure at point I.

[0020] Figure 10 This is a cross-sectional structural diagram of the pump cylinder in this utility model.

[0021] Figure 11 yes Figure 10 Enlarged schematic diagram of the structure at point II.

[0022] Figure 12 yes Figure 2 Enlarged schematic diagram of the structure at point III. Detailed Implementation

[0023] See Figure 1 - Figure 11This utility model discloses an integrated anti-corrosion oil extraction device combining a sucker rod and a sucker pump, comprising a sucker pump 1 and multiple sucker rods 2. The sucker pump 1 includes a pump barrel assembly 11, a plunger assembly 12, and a fixed valve assembly 13. The pump barrel assembly includes an upper pump barrel connector 111 and a pump barrel 112. The plunger assembly includes an upper oil outlet connector 120 and a plunger 121. The fixed valve assembly includes a fixed valve cover 131, a fixed valve ball 132, a fixed valve seat 133, and a fixed lower valve connector 134. Each sucker rod 2 has a rod body 21 and a rod head 22. Adjacent sucker rods are connected by a coupling 23 between the rod heads. Some sucker rods have centralizers 24 spaced apart on their rod bodies 21. The rod head of the lower sucker rods of the multiple sucker rods 2 is connected to the upper oil outlet connector 120. The upper sucker rod of rod 2 is connected to a polished sucker rod 9, which has a polished rod body 91 and a polished rod head 92. The rod head 22 of the upper sucker rod and the polished rod head 92 are also connected by the aforementioned coupling 23. The characteristic is that: the outer surface of the rod body 21 of the sucker rod 2 is coated with an epoxy resin anti-corrosion layer 211, and the outer surface of the rod head 22 is coated with a rod head nickel-based alloy anti-corrosion layer 221; the outer surfaces of the polished rod body 91 and the polished rod head 92 of the polished sucker rod 9 are both coated with a polished rod nickel-based alloy anti-corrosion layer 911, or the polished sucker rod 9 is made entirely of stainless steel; the outer surface of the coupling 23 and the outer surface of the plunger 121 are both coated with a nickel-based alloy anti-corrosion layer 231, and the cross-sectional view of the plunger is not shown; the inner surface of the pump barrel 112 is co-permeated with a wear-resistant anti-corrosion layer 1121.

[0024] See also Figure 2 , Figure 12 The fixed valve assembly 13 has a stepped hole 1311 on its fixed valve cover 131. A drain plug 1312 is screwed into the stepped hole and is sealed to fit between the stepped hole and the stepped hole. One end of the drain plug extends into the fixed valve cover. A blind hole 1313 with the open end facing outward is drilled in the drain plug. A circumferential groove 1314 is machined on the outer wall of the drain plug located in the fixed valve cover. When the drain plug breaks at the groove, the rod tube annulus and the oil sleeve annulus can be connected.

[0025] It is understood that the above specific description of the present utility model is only used to illustrate the present utility model and is not limited to the technical solutions described in the embodiments of the present utility model. Any modifications or equivalent substitutions to the present utility model to achieve the same technical effect are within the protection scope of the present utility model.

Claims

1. A corrosion-resistant oil pumping device integrating sucker rods and a sucker pump, comprising an oil pump (1) and multiple sucker rods (2), wherein the oil pump (1) comprises a pump barrel assembly (11), a plunger assembly (12), and a fixed valve assembly (13), wherein the pump barrel assembly comprises an upper pump barrel connector (111) and a pump barrel (112), the plunger assembly comprises an upper oil outlet connector (120) and a plunger (121), and the fixed valve assembly comprises a fixed valve cover (131), a fixed valve ball (132), a fixed valve seat (133), and a fixed lower valve connector (134); the oil pumping device... The rod (2) has a rod body (21) and a rod head (22). Adjacent sucker rods are connected by a coupling (23) between the rod heads. A centralizer (24) is installed at intervals on the rod body (21) of some sucker rods. The rod head of the lower sucker rod in the plurality of sucker rods (2) is connected to the upper oil outlet joint (120). The upper sucker rod in the plurality of sucker rods (2) is connected to a sucker rod (9). The sucker rod has a smooth rod body (91) and a smooth rod head (92). The rod head (22) of the upper sucker rod and the smooth rod head (92) are also connected by the coupling (23). The characteristic is that: The outer surface of the rod body (21) of the sucker rod (2) is coated with an epoxy resin anti-corrosion layer (211), and the outer surface of the rod head (22) is coated with a rod head nickel-based alloy anti-corrosion layer (221); the outer surfaces of the smooth rod body (91) and the smooth rod head (92) of the sucker rod (9) are coated with a smooth rod nickel-based alloy anti-corrosion layer (911), or the sucker rod (9) is made entirely of stainless steel; the outer surfaces of the coupling (23) and the plunger (121) are coated with a nickel-based alloy anti-corrosion layer (231); the inner surface of the pump barrel (112) is permeated with a multi-element wear-resistant anti-corrosion layer (1121).

2. The sucker rod and pump integrated anti-corrosion oil pumping device according to claim 1, characterized in that: The fixed valve assembly (13) has a stepped hole (1311) on its fixed valve cover (131). A drain plug (1312) is screwed into the stepped hole and is sealed to fit between the stepped hole and the stepped hole. One end of the drain plug extends into the fixed valve cover. A blind hole (1313) with the opening end facing outward is drilled in the drain plug. A circumferential groove (1314) is machined on the outer wall of the drain plug located in the fixed valve cover. When the drain plug breaks at the groove, the rod tube annulus and the oil sleeve annulus can be connected.

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