A packer with hydraulic setting and rotary unsealing

Abstract

The invention relates to a hydraulic setting and rotating unlocking packer, and belongs to the field of oil gas well underground working tools. The packer comprises an inner central pipe, an outer central pipe, an upper connector, a lower connector, a piton sleeve and a release sleeve. The upper connector is arranged at one end of the inner central pipe in a threaded mode. An outer central pipe is arranged on the portion, on one side of the upper connector, of the inner central pipe. A middle connector is arranged on the portion, on one side of the outer central pipe, of the inner central pipe. One end of the middle connector is connected with the outer central pipe in a threaded mode, and the other end of the middle connector is provided with the lower connector in a threaded mode. The packer is compact in structure; a setting mechanism and an unlocking mechanism are exquisite in design; by means of a shearing pin arranged in the setting mechanism, setting conducted in advance can be effectively prevented; the setting force is locked and kept through a locking ring after setting is conducted, and setting is durable and effective; the defects caused when multiple packers are unlocked by providing large torque are effectively avoided. The packer is particularly suitable for production, water (gas) injection, interlayer packing, separated injection and production, multi-layer testing and yield increase work of vertical shafts and small-inclination wells.

Description

technical field [0001] The invention relates to a packer for hydraulic setting and rotary unsealing, which belongs to the field of downhole operation tools for oil and gas wells. Background technique [0002] The packer is a special tool used to isolate oil, gas and water layers in downhole casing or open hole. Through the action of external force, the length of the rubber tube is shortened and the diameter is increased to seal the annular space of the oil and sleeve, and separate the oil (gas, water) layers above and below the packer, so as to realize the layered testing of oil and water wells, layered oil recovery, and separation. Layer water injection, layer transformation and sealing water layer. It is widely used in drilling, cementing, testing, and well completion, and can be used for production, water injection (gas), interlayer isolation, separate injection and production, multi-layer testing, stimulation operations, etc. [0003] Due to structural reasons, convent...

AI Technical Summary

Problems solved by technology

[0003] Due to structural reasons, conventional hydraulic packers usually adopt the structure of shear pins, which are directly lifted up and unsealed. Using multiple packers together will generate a large unsealing force, which has a great risk, and its suspension capacity is poor , and during downhole operations, changes in temperature and pressure will cause the pipe string to expand and contract, which may easily cause the packer to unseal in advance

At the same time, conventional hydraulic packers generally have low pressure bearing capacity and small internal diameter, which are not suitable for large-aperture completions and multi-layer combination packer completions

For the common rotary unsealing packer, it is usually mechanically set, and it is necessary to press down the pipe string to maintain the set state. If there is improper operation, it is difficult to judge the working status of the packer

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