Locking device for downhole sliding sleeve of intelligent well and operation method thereof

Abstract

The invention relates to a locking device for a downhole sliding sleeve of an intelligent well and an operation method thereof. The locking device is characterized by comprising a thickened oil pipe, wherein the periphery of the thickened oil pipe is sleeved with a locking hydraulic cylinder, and the locking hydraulic cylinder comprises a hydraulic cylinder cover and a cylinder sleeve that are connected through a bolt; the other end of the hydraulic cylinder cover is connected with a lower cover plate and an upper cover plate and positioned by a clamping ring arranged between the upper cover plate and the thickened oil pipe; a sliding sleeve is arranged between the locking hydraulic cylinder and the thickened oil pipe, a piston is arranged between the sliding sleeve and the cylinder sleeve, a piston annular space is kept between the piston and the sliding sleeve, and a returning spring is arranged between the piston and the cylinder sleeve; the hydraulic cylinder cover is provided with an oil inlet communicated in the cylinder sleeve, and the cylinder sleeve is provided with an oil outlet communicated with the outside; the contact part of the thickened oil pipe and the sliding sleeve is provided with a plurality of positioning grooves at intervals and a positioning steel ball; and the sliding sleeve is provided with a key slot, and the key slot is oppositely provided with a feather key. In the invention, the sliding sleeve can be locked through regulation under driving of hydraulic power so as to adjust the size of a downhole production runner. Therefore, the locking device is widely applied in a production control process of an oil and gas well.

Description

technical field [0001] The invention relates to an oil and gas drilling and completion and oil and gas production device, in particular to a sliding sleeve locking device applied to an intelligent well and an operation method thereof. Background technique [0002] Smart well is a kind of real-time collection of production parameters such as downhole temperature and pressure through downhole sensors, and analyzes the downhole production status, reservoir status and the data of the whole well production chain through transmission on the ground, and performs production management and monitoring of oil layers according to the production status of the oil well. Completion systems for enhanced oil well recovery. Downhole production control is mainly through the surface hydraulic system, hydraulically drives the downhole sliding sleeve, adjusts the opening degree of the sliding sleeve, adjusts the size of the downhole production flow channel, and realizes oil and gas well productio...

AI Technical Summary

Problems solved by technology

The method of hydraulic lock is usually adopted, that is, to close the hydraulic control system to keep the pressure, so that the sliding sleeve is stable at the designated position. This method requires the system to be under pressure all the time, and the hydraulic system cannot leak, so the reliability is difficult to guarantee.

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