A deep-sea expansion bellows through-type lowering method

Abstract

A deep-sea expansion bellows through-type running method, which is implemented by means of a pipe string device, including reaming the upper and lower parts of the accident hole section and selecting the length of the expansion bellows; running the pipe string device into the hole; pumping and throwing the ball; pressurized collision; Cut the upper transition joint; enlarge the upper incision; salvage the pipe into the block; cut the lower transition joint; expand the lower incision and other steps. The method of the present invention greatly reduces the pressure difference between the deep-sea drilling expansion bellows when it is lowered into the inside and outside, and effectively avoids the disadvantage that the expansion bellows is severely deformed under the action of huge external pressure and cannot be used. In addition, after the expansion bellows collides with the hanging wall, the salvage mechanism of the running device can be used to salvage and recover the ball seat and joint together with the running device. There is no foreign matter in the hole, so as to prevent the foreign matter in the hole from affecting the drilling process.

Description

technical field [0001] The invention relates to a drilling technology, in particular to a through-type lowering method for deep sea expansion bellows. Background technique [0002] With the development of geological drilling and prospecting to deep, remote and complex areas, the requirements for drilling methods are getting higher and higher. In the process of drilling in ultra-deep and complex areas, it is inevitable to encounter complex formations such as loss, collapse, shrinkage, and karst caves, and drilling accidents such as burning, sticking, and burying often occur. The recently introduced expansion bellows protection wall technology is an effective method to solve the in-hole accidents such as burning, sticking and burying of drill caused by formation loss, block loss and collapse of well wall during geological drilling and oil and gas drilling. Expansion tube wall protection technology is to lower the expansion tube into the hole during the geological construction...

AI Technical Summary

Problems solved by technology

The existing expansion bellows running device used in land drilling is a closed running device, and part of the internal pressure is sealed to balance the liquid column pressure outside the pipe body. However, due to deep sea drilling, the depth of sea water plus drilling may reach tens of thousands. m, the huge external pressure will cause a huge pressure difference between the inside and outside of the closed expansion bellows, which will cause serious deformation of the expansion tube during the running process, making it unusable. Therefore, the existing closed running device is not suitable for the expansion bellows in deep sea drilling download

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