A suspension device and method for controlling release by using hydraulic pressure difference

Abstract

The invention discloses a hanging device for controlling release through hydraulic pressure difference and a release controlling method thereof, and belongs to the drilling technical field. After a well descending tool is connected with the hanging device for controlling release through the hydraulic pressure difference, the hanging device for controlling release through the hydraulic pressure difference is tripped into a preset position inside a well, workover fluid is pumped therein from the inside of an oil pipe, and when the pressure difference value reaches 3-4 MPa, a pressure difference sliding sleeve descends; when the pressure difference sliding sleeve driving force exceeds spring starting force, the pressure difference sliding sleeve moves downwards to the position which is disengaged from a supporting face used for supporting a slip, at the moment, the slip is opened, a bearing connector and the well descending tool connected with the bearing connector are released to fall together, so that an expected purpose is achieved, the pressure difference sliding sleeve returns automatically under the action of a spring, and the pressure difference sliding sleeve can be cleaned and maintained to be used continuously after being pulled out. By means of the hanging device for controlling release through the hydraulic pressure difference and the release controlling method, the phenomenon that ball throwing is conducted for a long time, no fishing devices exist, and thus the downhole condition is complex can be avoided, it is guaranteed that the downhole operating environment cannot be polluted, and cleanliness and sanitation are achieved; after the method is matched with a pipe inner sand washing technology, the problem that an inner wash pipe can be stuck when returning to the oil pipe in the sand washing process is solved, and therefore the continuous sand washing purpose can be achieved.

Description

Technical field [0001] The invention relates to a suspension device and a controlled release method for controlled release using hydraulic pressure difference, and belongs to the technical field of drilling. Background technique [0002] At present, many oil wells use tools such as sliding sleeves and suspensions in order to achieve a certain goal according to their technology. After going down the well, whether it is a sliding sleeve or a throwing tool, it is basically solved by throwing a ball to hold down the pressure. The current method There are great limitations. Some processes have multiple levels of pressure holding, and there is no salvage bar, and the steel balls cannot be recovered, which makes the downhole situation complicated; if the pressure is held down or the hand fails, the wellhead pipe string cannot be connected and the wellhead operation volume And the difficulty of the operation is increasing, the wellhead is seriously polluted, and the working environment o...

AI Technical Summary

Problems solved by technology

[0002] At present, many oil wells use tools such as sliding sleeves and suspensions in the downhole tools to achieve a certain purpose according to their technology. After going into the well, whether it is a sliding sleeve or a hand-dropping tool, it is basically solved by throwing a ball to suppress the pressure. The current method There are great limitations. Some processes will have multiple multi-stage pressure suppression, and there is no salvage bar, and the steel balls cannot be recovered, resulting in complex downhole conditions; And the difficulty of operation is increased, the wellhead is seriously polluted, and the working environment of the operators is harsh

Secondly, the chance of rework increases due to the inability to drop hands

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