A fixed valve assembly

Abstract

This utility model discloses a fixed valve assembly, including a fixed valve cover, a fixed valve ball, a fixed valve seat, and a fixed lower valve connector. The fixed valve cover and the fixed lower valve connector are threaded together. The fixed valve ball is located in a valve ball lifting channel within the fixed valve cover. The fixed valve seat is fixed in a groove formed between the upper end of the fixed lower valve connector and the lower end of the fixed valve cover. The key feature is that the inner walls of both the fixed valve cover and the fixed lower valve connector are coated with an anti-scaling coating. The fixed valve ball and the fixed valve seat are non-magnetic. In this utility model, the inner walls of the fixed valve cover and the fixed lower valve connector are less prone to scaling, and the seal between the fixed valve ball and the fixed valve seat is relatively reliable.

Description

Technical Field

[0001] This utility model belongs to the field of valve technology, specifically relating to a fixed valve assembly. Background Technology

[0002] The oil pump mainly includes a pump barrel assembly, a plunger assembly, and a fixed valve assembly. The fixed valve assembly includes a fixed valve cover, a fixed valve ball, a fixed valve seat, and a fixed lower valve connector. The fixed valve cover and the fixed lower valve connector are threaded together. The fixed valve ball is located in a valve ball lifting channel within the fixed valve cover. The fixed valve seat is fixed in a groove formed between the upper end of the fixed lower valve connector and the lower end of the fixed valve cover.

[0003] As some oilfields enter the middle and late stages of development, the water content and salinity of the downhole environment continue to increase. In some pumping wells, the well fluid also contains brine, CO2, H2S, and Cl-. - Sulfates, etc. After a period of use, scale often forms on the inner walls of the fixed valve cover and the lower connector of the fixed valve after the fixed valve assembly has been used for a period of time. The longer the service time, the more serious the scaling becomes, which reduces the pump efficiency of the oil pump to a certain extent and reduces the service life of the fixed valve assembly. In addition, after a period of use, metal impurities may accumulate on the fixed valve ball and fixed valve seat, causing the fixed valve to not close tightly and resulting in well fluid leakage.

[0004] In addition, for rod-operated pumping systems, the pumps used in oil wells are usually conventional whole-tube pumps. The fixed valve assembly does not have a drainage function. During operation, the tubing string 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 surface. 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 a fixed valve assembly that is not prone to scaling on the inner wall of the fixed valve cover and the fixed valve lower connector, and has a relatively reliable seal between the fixed valve ball and the fixed valve seat.

[0006] To solve the above-mentioned technical problems, this utility model provides a fixed valve assembly, including a fixed valve cover, a fixed valve ball, a fixed valve seat, and a fixed lower valve connector. The fixed valve cover and the fixed lower valve connector are threaded together. The fixed valve ball is located in a valve ball lifting channel inside the fixed valve cover. The fixed valve seat is fixed in a groove formed between the upper end of the fixed lower valve connector and the lower end of the fixed valve cover. The fixed valve assembly is characterized in that: the inner walls of the fixed valve cover and the inner walls of the fixed lower valve connector are coated with an anti-scaling coating; the fixed valve ball is a non-magnetic fixed valve ball; and the fixed valve seat is a non-magnetic fixed valve seat.

[0007] As an improvement of this utility model, the fixed valve cover is further provided with a stepped hole, and a drain plug that is screwed into the stepped hole and seals with the stepped hole is provided. One end of the drain plug extends into the fixed valve cover. A blind hole with the opening 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 blind hole is connected to the space inside the fixed valve cover.

[0008] Furthermore, the anti-scaling coating is a Teflon coating.

[0009] This utility model has the following beneficial technical effects: 1. Because the inner wall of the fixed valve cover and the inner wall of the fixed valve lower connector are both coated with an anti-scaling coating, the utility model as a whole is not prone to scaling, thus extending its service life; 2. Because the fixed valve ball and the fixed valve seat are non-magnetic, magnetic metal impurities will not accumulate, improving the sealing reliability between the fixed valve ball and the fixed valve seat; 3. When this utility model is used in the oil pump, because the fixed valve cover in this utility model is equipped with a drain plug, 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 can be connected to the casing annulus, 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 a fixed valve assembly according to the present invention.

[0012] Figure 2 After removing the unloading plug and the fixed valve seat Figure 1 .

[0013] Figure 3 yes Figure 1 Enlarged schematic diagram of the structure at point I.

[0014] Figure 4 yes Figure 1 Enlarged schematic diagram of the structure at point II.

[0015] Figure 5 yes Figure 1 Enlarged structural diagram of the unloading plug. Detailed Implementation

[0016] See Figure 1 - Figure 5This utility model discloses a fixed valve assembly, comprising a fixed valve cover 1, a fixed valve ball 2, a fixed valve seat 3, and a fixed lower valve connector 4. The fixed valve cover 1 and the fixed lower valve connector 4 are threadedly connected. The fixed valve ball 2 is located in the valve ball lifting channel 5 inside the fixed valve cover 1. The fixed valve seat 3 is fixed in the groove 6 formed between the upper end of the fixed lower valve connector and the lower end of the fixed valve cover. The fixed valve ball 2 is a non-magnetic fixed valve ball, and the fixed valve seat 3 is a non-magnetic fixed valve seat. The fixed valve cover 1 is also provided with a stepped hole 11. A drain plug 12, which is screwed into the stepped hole and seals with it, is installed inside the stepped hole. One end of the drain plug extends into the fixed valve cover. A blind hole 13 with its open end facing outward is drilled inside the drain plug. A circumferential groove 14 is machined on the outer wall of the drain plug located inside the fixed valve cover. When the drain plug breaks at the groove, the blind hole connects with the space inside the fixed valve cover. A rubber sealing ring 15 is provided between the drain plug and the stepped hole to achieve a sealing fit between the drain plug and the stepped hole. The anti-scaling coating 7 is preferably a Teflon coating.

[0017] 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 fixed valve assembly, comprising a fixed valve cover (1), a fixed valve ball (2), a fixed valve seat (3), and a fixed lower valve connector (4), wherein the fixed valve cover (1) and the fixed lower valve connector (4) are threadedly connected, the fixed valve ball (2) is located in a valve ball lifting channel (5) within the fixed valve cover (1), and the fixed valve seat (3) is fixed in a groove (6) formed between the upper end of the fixed lower valve connector and the lower end of the fixed valve cover, characterized in that: The inner wall of the fixed valve cover (1) and the inner wall of the fixed valve lower connector (4) are both coated with an anti-scaling coating (7). The fixed valve ball (2) is a non-magnetic fixed valve ball, and the fixed valve seat (3) is a non-magnetic fixed valve seat.

2. The fixed valve assembly as described in claim 1, characterized in that: The fixed valve cover (1) is also provided with a stepped hole (11). A drain plug (12) is screwed into the stepped hole and is sealed to fit with the stepped hole. One end of the drain plug extends into the fixed valve cover. A blind hole (13) with the opening end facing outward is drilled in the drain plug. A circumferential groove (14) 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 blind hole is connected to the space inside the fixed valve cover.

3. The fixed valve assembly as described in claim 1, characterized in that: The anti-scaling coating (7) is a Teflon coating.

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