Hydraulic detachable packer with sliding sleeve

Abstract

The invention relates to a hydraulic detachable packer with a sliding sleeve, and belongs to the field of borehole operation of oil gas wells. The hydraulic detachable packer comprises a central tube, an upper connector, a lower connector, a middle connector, a release sleeve, an upper piston and a lower piston, wherein the lower connector is mounted at one end of the central tube through a connecting tube; an unsealing ball seat is mounted at the other end of the central tube through the release sleeve; the upper connector is mounted at the end of the unsealing ball seat through the middle connector; two ends of the middle connector are respectively connected with the upper connector and the release sleeve through fastening screws. The hydraulic detachable packer is simple and compact in structure, safe and reliable to recycle and particularly applicable to operation such as well drilling, well cementation, testing and well completion, the risk that an rubber cylinder and slips can be stuck by gravels and chippings when the hydraulic detachable packer is unsealed and recycled as an ordinary hydraulic packer is generally relatively low in pressure resistance can be avoided, and the problems of unsealing and recycling difficulties can be solved.

Description

technical field [0001] The invention relates to a hydraulic removable packer with a sliding sleeve, which belongs to the field of downhole operation tools for oil and gas wells. Background technique [0002] As one of the main tools in petroleum exploration and development, packers are widely used in drilling, cementing, testing, well completion, etc., and can be used for production, water (gas), interlayer isolation, separate injection and production, Multi-layer testing, production stimulation operations, etc. Its working principle is to cause large radial deformation of the rubber sleeve through hydraulic or mechanical effects, and bulge the annular space in the casing, so that contact pressure is generated between the rubber sleeve and the casing, and the annular passage between the oil pipe and the inner wall of the casing Blocking, so as to achieve the requirements of plugging in the oil production process. Provide guarantee for oil well layered oil recovery, water p...

AI Technical Summary

Problems solved by technology

[0004] Due to structural reasons, the conventional mechanical packer is used with a rotating string, especially not suitable for ultra-deep wells or deviated wells where the torque is not well transmitted, and horizontal wells

Conventional hydraulic packers generally have low pressure bearing capacity, and there is a risk that the rubber cartridge and slips will be stuck by gravel and debris during unpacking and recovery, making it difficult to unpack and recover

At the same time, most of the removable packers are unsealed by lifting or right-handedly cutting the shear pin, which has the risk of unsealing in advance

Images