Explosion-activated type downhole annulus blowout preventer

Abstract

The invention discloses a downhole blowout prevention technology, belongs to the field of downhole blowout prevention, and further discloses an explosion-activated type downhole annulus blowout preventer. Upper and lower joints are installed at both ends of a center cylinder, and the center cylinder is in threaded connection with the upper and lower joints; the lower end of the upper joint is externally sleeved with an outer sleeve, and the lower end of the upper joint is in threaded connection with the outer sleeve; the two ends of a rubber cylinder are fixed with rubber cylinder joints; andthe rubber cylinder pushes a piston through the explosion of an explosive, and compressed oil is squeezed into the rubber cylinder for expansion. The explosion-activated type downhole annulus blowoutpreventer is powered by the explosion to push the piston, generates vibration sound waves to transmit downhole information, and is simple in structure and safe and reliable in operation; and after setting, the internal and external annuli of a drill string form a new circulation passage to facilitate the subsequent well killing work, and the drill string is lowered to cut a pin to realize unsealing.

Description

technical field [0001] The invention designs a blowout prevention technology when well kick and blowout occur in the drilling process of oil and gas fields. Background technique [0002] In various fields of oil and gas development and petroleum exploration, drilling operations have always played a very important role, such as exploring the location of oil and gas reservoirs, detecting oil and gas area and reserves, obtaining relevant data on geological data and formation development, and finally extracting crude oil from The underground transportation to the surface, etc., all these links need to be completed by drilling. Drilling is a key link in the exploration and development of oil and natural gas resources, and it is also an important means. [0003] With the development of my country's economy and society, the demand for oil and gas resources in all walks of life is increasing, and the current supply of oil and gas can no longer meet the requirements of modern product...

AI Technical Summary

Problems solved by technology

However, the entire process of the blowout preventer before and after the blowout prevention operation is automatically controlled, and there is no information interaction with the ground. If drilling continues without knowing it, it will bring huge hidden dangers to the project

[0007] The application number is CN200910312469.8, the publication number is CN101718182A, and the publication date is June 02, 2010. The Chinese invention patent application named ball valve internal and external integrated downhole blowout preventer discloses a downhole blowout preventer. Although the downhole blowout preventer can realize the downhole blowout preventer operation, there is no early warning for the bottom well overflow. It is necessary for the operator to find the overflow in time before the ground control center can send a signal to control the operation of the downhole blowout preventer. Timely, and the risk is very high, requiring the operator to have certain experience and sense of responsibility

At the same time, the pressure of the drilling fluid is slow, which will make the response of the blowout prevention operation lag

Moreover, the follow-up well killing operation of this method faces the difficulties of long period and high cost

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