Packer

Abstract

The invention provides a packer which comprises a central tube as well as a locking mechanism, an actuating mechanism, a sealing mechanism and an anchor mechanism which are arranged outside the central tube, wherein the actuating mechanism enables the sealing mechanism and the anchor mechanism to act; the locking mechanism comprises a lock sleeve adjacent to the sealing mechanism, a locating component arranged outside the lock sleeve, a right-hand nut and a left-hand nut arranged inside the lock sleeve and spaced at an interval, and a right-hand thread section and a left-hand thread section arranged on the outer wall of the central tube and corresponding to the right-hand nut and the left-hand nut; a through hole is arranged on the wall, corresponding to the lock sleeve, of the central tube and a baffle is arranged outside the wall of the tube; the baffle and the inner wall surface of the lock sleeve are sealed and connected to form a cylinder bottom of a piston cavity; and the actuating mechanism comprises a piston arranged in the piston cavity and connected with the lock sleeve and an unpacking elastic component connected with the piston. The packer has the advantages that the prevention of midway setting and setting failure can be effectively realized, the working reliability is improved, the multi-time setting and unpacking in one string can be realized, the borehole operation procedure is simplified, the working efficiency is improved, and the cost is greatly saved.

Description

technical field [0001] The invention relates to a plugging tool used for sealing off lower oil, gas and water layers in mines such as oil wells and gas wells, and in particular to a packer. Background technique [0002] Packers are widely used in oil wells, gas wells and other mines to seal off the lower oil, gas and water layers. It is a safe, reliable, low-cost, fully functional and widely applicable downhole plugging tool. The packer can be used in conjunction with other downhole tools for temporary, permanent, selective and snubbing operations. [0003] The removable packer is mainly composed of five parts: actuator, anchoring mechanism, locking mechanism, sealing mechanism and fishing mechanism. [0004] Among them, the actuator is used to realize setting and unsealing. According to the setting power source of the actuator, the packer is mainly divided into two types: mechanical setting and hydraulic setting. The actuator realizes setting by cutting the setting shears ...

AI Technical Summary

Problems solved by technology

However, in the corrosive well bottom of high temperature and high pressure, the locking function of the aforementioned locking mechanism is poor in reliability, and it is easy to cause midway setting accidents at places where setting should not occur during the process of lowering the packer, and it is also easy to set the seal on the target. After the position is set, it cannot be firmly maintained in the set position, and the setting failure accident occurs

In addition, for the aforementioned three packers, only one setting and unsealing action can be performed in each next string trip. For the setting and unsealing action of the next well section, the bridge packer must be lifted to the well surface, and the packer must be replaced. Only when the setting shear nails and unsealing shear nails are damaged during the setting and unsealing process of the packer, the packer can be lowered into the well again to realize the next setting and unsealing, and it is impossible to complete multiple wells in one trip. Multiple setting and unsealing actions, complicated operation, low efficiency and high cost of downhole operation

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