A wireless electromagnetic wave direct control pressure relief casing valve

Abstract

The invention relates to a wireless electromagnetic wave direct current control casing valve capable of relieving pressure. The valve comprises an upper joint, a baffle ring, an upper outer shell, a middle outer shell, a lower outer shell, a lower joint, a valve clack opening and closing mechanism, a bypass pressure relief mechanism and a wireless electromagnetic wave control system, wherein the valve clack opening and closing mechanism and the bypass pressure relief mechanism are arranged in the middle outer shell, the upper joint and the lower joint are connected with an upper casing pipe and a lower casing pipe respectively through taper threads. According to the valve, through the adopted wireless electromagnetic wave control system, signals are transmitted through the metal walls of the casing pipes, the safety and reliability are higher compared with that of an existing control mode, and the machining and operation construction difficulty of a casing pipe string is reduced; a hollow shaft motor is used in the valve clack opening and closing mechanism, so that the narrow space between the casing pipes is well met, and the motor can output large torque, so that valve clack opening and closing are reliable; and the bypass pressure relief mechanism is arranged so that the upper and lower pressure of the casing valve can be balanced, lower pressure building is prevented, and normal opening of the casing valve is guaranteed.

Description

technical field [0001] The invention relates to the technical field of petroleum engineering underbalanced drilling, in particular to a wireless electromagnetic wave direct control pressure relief casing valve. Background technique [0002] With the increasing demand for oil and gas resources and the continuous improvement of drilling technology, underbalanced drilling technology has been in-depth research and continuous development. Compared with traditional drilling methods, underbalanced drilling technology can effectively solve the problem of oil and gas layer pollution, greatly reduce the damage of drilling to the formation, reduce lost circulation, increase the rate of penetration, shorten the construction period, and especially effectively discover concealment oil and gas layers, etc. With the development of underbalanced drilling technology, various oil companies have increasingly higher technical requirements for underbalanced drilling, requiring to achieve underba...

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to solve the problems existing in the use of the existing casing valve, and provide a wireless electromagnetic wave direct control pressure-relieving casing valve to solve the problem that the existing casing valve is easy to damage the internal structure of the valve body; Tongue opening and closing realizes safe and reliable control; when performing underbalanced operations on gas wells or gas-bearing oil wells, the pressure under the valve tongue cannot normally open the casing valve

The present invention adopts a wireless electromagnetic wave control system, sends control signals through the ground, transmits signals through the metal wall of the casing, receives signals through the signal receiver inside the casing valve, and then controls through the PLC controller, which can effectively solve the problem of hydraulic control and Cable control and other methods are prone to failure and high cost; the invention adds a rubber ring to the lower part of the valve tongue switch cylinder, which can solve the problem that the valve tongue is easily scratched when the valve tongue is opened; the invention uses a hollow shaft in the valve tongue opening structure The motor makes great use of the small space in the well, and solves the problem that ordinary motors are limited by the small space in the well, which leads to the use of small-sized and low-power motors, which may make it difficult to open the valve tongue; the invention increases the bypass leakage. The pressure structure can balance the pressure on the upper and lower sides of the casing valve before opening the casing valve, and can solve the problem that the downhole air bubbles rise and cause the lower part of the valve tongue to hold pressure and cause the valve tongue to fail to open during underbalanced tripping.

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