Coupling detection device during downhole tubing tripping

Abstract

The invention discloses a coupling detection device in roundtrip process of a downhole oil tube. The coupling detection device comprises a pressure regulation valve, a check valve, a reducing signal detection valve, a diversion valve, a right oil cylinder, a left oil cylinder, a barometer, a prompt device stroke switch and an oil tube coupling component, wherein rollers which are mounted at the outer ends of piston rods of the left and right oil cylinders are symmetrically arranged on two sides of the oil tube coupling component, cling to and are in contact with the side walls of the oil tube coupling component; the barometer is communicated with a barometric pressure cavity of the reducing signal detection valve; the prompt device stroke switch is arranged at a limiting position of a piston rod of the reducing signal detection valve. According to the coupling detection device, the theory that the liquid cannot be compressed and the gas can be compressed is utilized; the reducing signal detection valve controls the left and right rollers to be in mechanical rigid contact with the oil tube coupling component, and converts the mechanical rigid contact into flexible transformation between liquid phase and gas phase, so as to realize the correct non-destructive detection for the coupling lifting condition and the overcome the defects of the conventional coupling detection device; such as liquid phase and gas phase balance mechanism is ingenious in structural design and is capable of ideally satisfying the requirements of operations of oil fields under pressure.

Description

technical field [0001] The invention relates to an oil-casing assembly for oil field development, in particular to an oil-casing assembly. Background technique [0002] During pressurized operation, the annular space between the tubing and the casing is sealed by a blowout preventer. When lifting and lowering the oil pipe, when the oil pipe coupling is close to the sealing position of the blowout preventer, the sealing ram (or rubber core) of the blowout preventer must be retreated, otherwise, it will not cause serious damage to the sealing ram (rubber core) of the blowout preventer , is to cause accidents such as coupling tripping and tubing falling into the well. Therefore, it is very important to accurately judge the position of the coupling when working under pressure. At the same time, in conventional workover operations, the collar detector is also an indispensable key component in the process of automatic operation. [0003] At present, there are many researches on...

AI Technical Summary

Problems solved by technology

The mechanical coupling detection device has a complex structure and a large volume. The probe and the coupling are in rigid contact. At the same time, it does not solve the effects of oil pipe position eccentricity, oil contamination, and downhole pressure changes. It has no practical application value. ; The operating technical requirements of the ultrasonic coupling detection device and the magnetic coupling detection device are too high, and the professional requirements of the operators are too high. The general oil field workers cannot operate, and at the same time, the response is slow and there is much interference, so it is impossible to realize the electrical signal Accurate and timely feedback

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