Underbalanced drilling operation machine under pressure

Abstract

The invention provides an underbalanced drilling operation machine under pressure. The underbalanced drilling operation machine under pressure includes a single lifting system, a pipe column rotatingcontrol system and a pipe column exterior sealing system. The pipe column rotating control system is disposed between the single lifting system and the pipe column exterior sealing system. The pipe column rotating control system includes a lifting system and a lifting rotating system. The lifting system is disposed above the lifting rotating system, the lifting system clamps a drill rod to preventthe drill rod from jumping upwards, and the lifting rotating system rotates and places down the drill rod. The underbalanced drilling operation machine under pressure has the advantages that the operation machine under pressure is provided with a turntable power system and has lifting power and anti-pushing power, and the whole underbalanced operation can be met under the conditions that a groupof annular blowout preventers is added.

Description

technical field [0001] The invention relates to the field of drilling machinery, and more specifically relates to a pressurized operation machine for underbalanced drilling. Background technique [0002] Conventional underbalanced drilling has the following problems. 1. Normal drilling can rely on the weight of the drilling tool for underbalanced drilling, but in the completion stage, it cannot be completed directly, and it must rely on other means for assistance, which is expensive and Poor reliability. 2. It is impossible to realize the sealing of the wellhead annulus in a true sense. When the rotary BOP passes through the joint collar of the drilling tool, because the rotary BOP is passively sealed, it takes a certain time for the rubber core to open and recover. At this time, the mud Or combustible gas will definitely be ejected from this gap, which is unavoidable. For a well of 3,000 meters, more than 300 joints have to be passed during the tripping process, which mean...

AI Technical Summary

Problems solved by technology

[0002] Conventional underbalanced drilling has the following problems. 1. Normal drilling can rely on the weight of the drilling tool for underbalanced drilling, but in the completion stage, the well cannot be completed directly. It must rely on other means for assistance, which is expensive and poor reliability

2. It is impossible to realize the sealing of the wellhead annulus in a true sense. When the rotary BOP passes through the joint collar of the drilling tool, because the rotary BOP is passively sealed, it takes a certain time for the rubber core to open and recover. At this time, the mud Or combustible gas will definitely be ejected from this gap, which is unavoidable. For a well of 3,000 meters, more than 300 joints have to be passed during the tripping process, which means that there are more than 300 gas or mud overflows, and there is a serious safety hazard. Hidden danger

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