Matching tool for controlling plugging of oil pipe of oil well

Abstract

The invention discloses a matching tool for controlling plugging of an oil pipe of an oil well. The matching tool comprises an upper connector, a sleeve, an upper connection pipe, a lower connection pipe and a lower connector which are in threaded connection in sequence, a sliding block is arranged in a shaft hole in the upper connector dynamically in a matched mode, guide grooves are evenly distributed in the sliding block, a rotor is arranged in the sliding block, guide grooves are evenly distributed in the outer wall of the rotor, the saw-tooth-shaped upper end face of the rotor is matched with the lower end face of the sliding block, the guide grooves of the sliding block and the guide grooves of the rotor are matched with sliding rails of the sleeve, and the sliding rails of the sleeve are provided with inclined lower end faces matched with the saw-tooth-shaped upper end face of the rotor. A rotor supporting pipe is arranged in the upper connection pipe, the upper end face of the rotor supporting pipe is matched with a blocking table in the shaft hole of the rotor, the rotor is connected with a rotor supporting pipe and a screen pipe which are located in the upper connection pipe and the lower connection pipe in sequence, the blocking table is arranged in the upper connection pipe, the upper end of an upper spring arranged on a blocking shoulder in the lower connection pipe is matched with the lower end face of the rotor supporting pipe, a valve seat is arranged below the blocking shoulder, a valve ball seat is arranged in a lower connector pipe through a lower spring, a valve ball is matched with the valve seat, and a screen pipe column is matched with the valve ball. By means of the matching tool for controlling plugging of the oil pipe of the oil well, the operation process is controlled through multiple times of power on and power off after lowering at one time, and therefore, operation is convenient.

Description

technical field [0001] The invention belongs to a tool for controlling clogging of oil wells and oil pipes used in oil well pressure operations in oil fields or used as a safety precaution in the oil production process, in particular to a supporting tool for controlling clogging of oil wells and oil pipes. Background technique [0002] 1. In the production process of heavy oil wells, high-pressure steam injection is often required, and the wellhead device is mostly used for temperature and pressure alone. Traditional control methods have the following disadvantages: [0003] 1. When steam enters the tubing string, it is easy to precipitate solid scale, deteriorate the internal working environment of the tubing string, and cause many hidden dangers such as "pump stuck"; [0004] 2. Only the wellhead device bears pressure separately, which is a single-level safety measure, and there is still room for improvement in the safety factor; [0005] 3. The operation is complicated ...

AI Technical Summary

Problems solved by technology

[0003] 1. When steam enters the tubing string, it is easy to precipitate solid scale, deteriorate the internal working environment of the tubing string, and cause many hidden dangers such as "pump stuck";

[0004] 2. Only the wellhead device bears pressure separately, which is a single-level safety measure, and there is still room for improvement in the safety factor;

[0005] 3. Complex operation and high labor intensity

[0006] 2. During high-pressure maintenance operations on the oilfield site, it is sometimes necessary to raise the tubing string

[0008] 2. Damage the formation and affect subsequent production

[0009] Due to the incompatibility between the killing fluid and the inherent properties of oil and gas layers (such as salinity, pH value, surface tension, solid particle size, solid particle content, etc.), it is easy to precipitate scale or cause other effects, resulting in lower yields

[0010] 3. The work time is long and the construction period is delayed;

[0011] 4. It is easy to cause environmental pollution

[0023] (2) Due to the influence of wax deposition and scaling on the inner wall of the tubing, the plugging tool is sometimes not in place, and the plugging depth is relatively shallow. In addition, frequent fishing and fishing times are frequent, the well cycle is long, and the operation efficiency is low, which affects the progress of the workover operation

[0024] (3) When the original well pipe string needs to be pulled out in the secondary operation, the well killing operation is still required

The operation process is complex, and the docking rate of supporting tools and downhole plugging tools is low

[0028] (3) During the secondary operation, due to scaling and waxing on the inner wall of the oil pipe, the lowering and docking will be affected.

[0029] (4) The sealing structure is complicated, and the sealing performance is poor after repeated use

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