Under-pressure drilling device for oil-gas well mouth

Abstract

The invention provides an under-pressure drilling device for an oil-gas well mouth. The device comprises an elevator, a pressure balance pipe, a pressure balance valve, a drilling unit, a packing component, an adapter, a blowout prevention nozzle, a blowout prevention valve, a gate valve, a drill rod string, a pressure balance manifold, and a control console; the elevator is arranged at the end ofthe pressure balance pipe; the middle of the pressure balance pipe is of a hollow structure; the pressure balance valve is arranged at the other end of the pressure balance pipe; the drilling unit comprises a power mechanism and an executing mechanism which are connected with each other; the executing mechanism is arranged at one end of the pressure balance valve; in the drilling direction, the packing component, the adapter, the blowout prevention nozzle, the blowout prevention valve and the gate valve are connected in sequence; the drill rod string is arranged in the drilling device; one end of the pressure balance manifold is communicated with the hollow structure of the pressure balance pipe, and the other end is communicated with the adapter or the blowout prevention nozzle; and thecontrol console is used for starting tripping of the drill rod string and controlling the drilling speed of the drill rod string. The under-pressure drilling device for the oil-gas well mouth is convenient to operate and good in sealing performance.

Description

technical field [0001] The invention relates to the technical field of oil and gas well development, and more specifically, relates to a pressurized drilling device for the wellhead of an oil and gas well. Background technique [0002] The wellhead device of gas production is an important channel for the safe production of gas wells, and it is also the main device for gas well pressure control. However, with the increase of the production life of the gas well, the wellhead device will have many safety hazards due to wear, corrosion, aging and other reasons. If it is not treated in time, it will affect the safe production of gas wells, seriously damage the surrounding environment, and threaten the lives of humans and animals. [0003] Drilling under pressure technology is to connect the drilling device under pressure with the pressure gate valve to be drilled, the pipe string, the wellhead, etc. Sealed connection, in the sealed state, drill those valves, pipelines, and wellh...

AI Technical Summary

Problems solved by technology

[0002] The wellhead device of gas production is an important channel for the safe production of gas wells, and it is also the main device for gas well pressure control. However, with the increase of the production life of the gas well, the wellhead device will have many safety hazards due to wear, corrosion, aging and other reasons.

If it is not treated in time, it will affect the safe production of gas wells, seriously damage the surrounding environment, and threaten the lives of humans and animals.

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