Sand trap type rod pump support seal

Abstract

A kind of sand type rod oil well pump supporting sealing device, the upper portion of leather cup supporting connector is connected in the lower portion of oil string, double-channel supporting leather cup spindle assembly, sand pipe, plug is sequentially connected, the upper portion of double-channel supporting leather cup spindle assembly is connected in the lower portion of rod oil well pump oil inlet valve, the middle portion of double-channel supporting leather cup spindle assembly is installed in leather cup supporting connector, double-channel supporting leather cup spindle assembly is sealed with leather cup supporting connector, the outer diameter of double-channel supporting leather cup spindle assembly, sand pipe, plug is less than the inner diameter of oil string, the outer diameter of sand pipe, plug is less than the inner diameter of leather cup supporting connector, double-channel supporting leather cup assembly has oil inlet channel and sand channel, the upper end of oil inlet channel is communicated with the inlet of rod oil well pump oil inlet valve, the lower portion of oil inlet channel is communicated with oil well casing, the upper end of sand channel is communicated with the annular space between rod oil well pump and oil string, the lower end of sand channel is communicated with the interior of sand pipe.

Description

Technical Field

[0001] This utility model relates to a support and sealing device for a rod-type oil pump used in oil fields, and in particular to a support and sealing device for a sand-sinking rod-type oil pump. Background Technology

[0002] When inspecting a rod-type oil pump, there is no need to remove or remove the tubing; the pump can be replaced simply by removing the sucker rod, saving time and money. However, in oil wells producing sand, when using a rod-type oil pump, if sand particles accumulate on the support joint of the rod-type oil pump and cause pump jamming, and measures such as backwashing cannot remove the jamming, the sucker rod is usually pulled out upside down, and then the tubing and oil pump are pulled out for pump replacement. This does not achieve the goal of reducing and simplifying pump inspection operations.

[0003] To prevent sand from burying or jamming the sucker rod pump, sand-proof sucker rod pumps have been developed, such as the sand-proof sucker rod pump (application number 201120180072.0). This pump employs a double-channel diaphragm support for the sand-absorbing joint and the sand-absorbing tailpipe, which can prevent sand from burying or jamming the pump to a certain extent. However, this design, with the inlet and sand-absorbing channels located on the support joint of the sucker rod pump, has two drawbacks: first, it prevents the connection of auxiliary pumping tools such as air anchors and sand anchors below the pump; second, it does not remove the sand during pump inspection operations.

[0004] The technical problem to be solved by this utility model is to prevent sand particles from accumulating on the support joint of the rod-type oil pump and causing pump jamming, without affecting the use of oil pumping auxiliary tools such as gas anchors and sand anchors, and at the same time, the sand particles can be carried out with the pump during pump inspection. Summary of the Invention

[0005] The purpose of this invention is to design a sand-sinking rod-type oil pump support sealing device, which can prevent sand particles from accumulating on the rod-type oil pump support joint and causing pump jamming, without affecting the use of oil pumping auxiliary tools such as gas anchors and sand anchors, and can carry away the sand with the pump during pump inspection.

[0006] The purpose of this utility model is achieved as follows: It includes a cup support joint, the upper part of which is connected to the lower part of the sucker tubing string. It also includes a dual-channel cup support mandrel assembly, a sand-reducing tube, and a plug, which are connected sequentially. The upper interior of the dual-channel cup support mandrel assembly is connected to the lower part of the rod-type sucker pump inlet valve. The middle part of the dual-channel cup support mandrel assembly is installed inside the cup support joint. The dual-channel cup support mandrel assembly and the cup support joint are sealed together. The outer diameter of the mandrel assembly, sand-retaining tube, and plug is smaller than the inner diameter of the tubing string. The outer diameter of the sand-retaining tube and plug is smaller than the inner diameter of the cup support joint. The outer diameter of the lower part of the dual-channel cup support mandrel assembly is smaller than the inner diameter of the cup support joint. The dual-channel cup support assembly has an oil inlet channel and a sand-retaining channel. The upper end of the oil inlet channel is connected to the inlet of the rod-type pump inlet valve, and the lower part of the oil inlet channel is connected to the well casing. The upper end of the sand-retaining channel is connected to the annular space between the rod-type pump and the tubing string, and the lower end of the sand-retaining channel is connected to the interior of the sand-retaining tube.

[0007] The useful effects of this utility model are as follows: Downhole sand-laden oil is pressurized after entering the pump through the inlet channel and discharged onto the pump. Sand particles in the oil on the pump are deposited into the sand-sinking pipe sealed by the plug through the annular space between the pump and the tubing string, and the sand-sinking channel on the dual-channel support cup mandrel assembly. This prevents sand particles from accumulating on the rod-type pump support joint and causing pump jamming. The sand-sinking pipe and plug connected below the dual-channel support cup mandrel assembly can be removed along with the sucker rod, pump, and dual-channel support cup mandrel assembly, thus achieving the purpose of sand sinking with the pump during pump inspection. Furthermore, tubing can be connected below the cup support joint and extended to the plug below the sand-sinking pipe, thus ensuring that the use of auxiliary tools such as gas anchors and sand anchors is not affected. Attached Figure Description

[0008] Figure 1 This is a structural diagram of an embodiment of the present utility model. Detailed Implementation

[0009] As shown in the figure, the embodiment of this utility model includes a cup support joint 1, the upper part of which is connected to the lower part of the sucker tubing string. It also includes a dual-channel cup support mandrel assembly 2, a sand-collecting pipe 3, and a plug 4, which are connected sequentially. The upper interior of the dual-channel cup support mandrel assembly 2 is connected to the lower part of the rod-type sucker pump inlet valve. The middle part of the dual-channel cup support mandrel assembly 2 is installed inside the cup support joint 1. The dual-channel cup support mandrel assembly 2 and the cup support joint 1 are sealed together. The dual-channel cup support mandrel assembly 2 and the sand-collecting pipe 3 are connected in sequence. The outer diameter of pipe 3 and plug 4 is smaller than the inner diameter of the tubing string. The outer diameter of sand-sinking pipe 3 and plug 4 is smaller than the inner diameter of the cup support joint 1. The outer diameter of the lower part of the double-channel support cup mandrel assembly 2 is smaller than the inner diameter of the cup support joint 1. The double-channel support cup assembly 2 has an oil inlet channel 2-1 and a sand-sinking channel 2-2. The upper end of the oil inlet channel 2-1 is connected to the inlet of the rod-type oil pump inlet valve. The lower part of the oil inlet channel 2-1 is connected to the oil well casing. The upper end of the sand-sinking channel 2-2 is connected to the annular space between the rod-type oil pump and the tubing string. The lower end of the sand-sinking channel 2-2 is connected to the interior of the sand-sinking pipe 3.

[0010] The upper part of the sand settling pipe 3 is provided with a reduced diameter section 3-1 for lifting. The outer diameter of the reduced diameter section 3-1 is smaller than the outer diameter of the sand settling pipe 3. The reduced diameter section 3-1 is designed to install a lifting clamp when lowering the pipe into the well, making it easier to lift and lower it into the well.

[0011] The upper outer diameter of the double-channel support cup mandrel assembly 2 is larger than the inner diameter of the cup support joint, so that the double-channel support cup mandrel assembly 2 is supported on the cup support joint 1. This setting plays a positioning role, ensuring that the seal on the double-channel support cup mandrel assembly 2 is inside the cup support joint 1, so that the upper outer wall of the double-channel support cup mandrel assembly 2 and the inner wall of the cup support joint 1 are in a sealed state.

[0012] When running the pump down the well, the cup support connector 1 is connected to the lower part of the tubing string and is first run into the well along with the tubing string. Then, the upper part of the double-channel support cup mandrel assembly 2 is connected to the lower part of the rod pump. The upper end of the components of the rod pump that reciprocate with the sucker rod (for a fixed-cylinder rod pump, the reciprocating component is the plunger assembly; for a moving-cylinder rod pump, the reciprocating component is the pump barrel and discharge valve assembly) is connected to the lower end of the sucker rod string. The plug 4, the sand-removing pipe 3, the double-channel support cup mandrel assembly 2, and the rod pump can then be run into the tubing string that has already been run down the well along with the sucker rod. Under the weight of the sucker rod, the seal on the dual-channel support cup mandrel assembly 2 is pressed into the cup support joint 1 and locked into one piece. At this time, when the sucker rod reciprocates within the stroke range of the rod pump, the non-reciprocating parts of the rod pump (the non-reciprocating components of the fixed-cylinder rod pump are the pump barrel and the inlet valve assembly, and the non-reciprocating components of the moving-cylinder rod pump are the plunger and the inlet valve assembly) will not move in series, and the well can be started for production.

[0013] The lower outer wall of the cup support joint 1 has tubing threads, which can be used to connect tubing of the required length. The length of this tubing section should be such that its lower end is below the plug 4, allowing the connection of a gas anchor or sand anchor to the lower end of this tubing section. After the gas anchor or sand anchor is installed, the well fluid enters through the outside of the gas anchor or sand anchor. After gas-sand separation, the well fluid flows upward through the annular space between this tubing section and the sand-filled pipe, and is pumped away into the rod-type pump through the oil inlet channel 2-1.

[0014] When pumping stops for any reason, the sand particles in the sucker tubing can sink into the sand settling pipe 3 through the sand settling channel 2-2.

[0015] When pump inspection is required, lifting the sucker rod will disengage the dual-channel support cup spindle assembly 2 from the cup support joint 1, allowing the rod-type oil pump, dual-channel support cup spindle assembly 2, sand settling pipe 3, and plug 4 to be pulled out to the ground, so that the sand in the sand settling pipe 3 can also be removed and cleaned.

Claims

1. A sand-pot type rod pump support sealing device, comprising a cup support joint (1), the upper part of the cup support joint (1) is connected to the lower part of the oil pumping string, characterized in that: It also includes a dual-channel support cup mandrel assembly (2), a sand-removing tube (3), and a plug (4). The dual-channel support cup mandrel assembly (2), the sand-removing tube (3), and the plug (4) are connected in sequence. The upper interior of the dual-channel support cup mandrel assembly (2) is connected to the lower part of the rod-type oil pump inlet valve. The middle part of the dual-channel support cup mandrel assembly (2) is installed in the cup support joint (1). The dual-channel support cup mandrel assembly (2) and the cup support joint (1) are sealed together. The outer diameter of the dual-channel support cup mandrel assembly (2), the sand-removing tube (3), and the plug (4) is smaller than the inner diameter of the oil tubing string. (3) The outer diameter of the plug (4) is smaller than the inner diameter of the cup support joint (1). The outer diameter of the lower part of the double-channel support cup mandrel assembly (2) is smaller than the inner diameter of the cup support joint (1). The double-channel support cup assembly (2) has an oil inlet channel (2-1) and a sand settling channel (2-2). The upper end of the oil inlet channel (2-1) is connected to the inlet of the rod-type oil pump inlet valve. The lower part of the oil inlet channel (2-1) is connected to the oil well casing. The upper end of the sand settling channel (2-2) is connected to the annular space between the rod-type oil pump and the oil tubing string. The lower end of the sand settling channel (2-2) is connected to the interior of the sand settling pipe (3).

2. A sand-set rod pump support seal apparatus according to claim 1, wherein the sand-set The upper part of the pipe (3) is provided with a reduced diameter section (3-1) for lifting, and the outer diameter of the reduced diameter section (3-1) is smaller than the outer diameter of the sand settling pipe (3). ​ 3. The sand-absorbing rod-type oil pump support sealing device according to claim 1, characterized in that: The upper outer diameter of the double-channel support cup mandrel assembly (2) is larger than the inner diameter of the cup support joint, so that the double-channel support cup mandrel assembly (2) is supported on the cup support joint (1).

Images