Gradually unpacked washable well packer

Abstract

The invention provides a gradually unpacked washable well packer. The packer comprises an upper connector, a central pipe, an upper working barrel, a well-washing working barrel, a well-washing piston component, a fixed ring, a well-washing ring, a plastic barrel component, a fixed piston, a piston-releasing component, a clamp spring component, a releasing barrel, an outer working barrel and a lower connector, and is characterized in that: the fixed ring is in threaded connection with the upper working barrel; the upper end of the upper working barrel is in threaded connection with the upper connector; uniformly distributed through holes are formed on the circumferential wall of the upper end of the fixed ring; steel balls are arranged in the through holes; outer arc grooves matched with the steel balls are formed on the well-washing working barrel; the inner circumferential face of the well-washing piston component is matched with the fixed ring with the steel balls in a sliding manner, and the outer circumferential face of the well-washing piston component is matched with the inner circumferential face of the upper working barrel in a sliding manner; pressure inlet holes are formed at the upper end and the lower end of the central pipe; the upper end of the central pipe is in threaded connection with a sealed piston and sleeved with the upper connector; and the sealed pistonis axially fixed with the upper working barrel through an unpacking pin.

Description

technical field [0001] The invention belongs to a packer for oil recovery from oil wells and water injection to wash wells, in particular to a step-by-step unsealing and washable well packer. Background technique [0002] Packer is an essential downhole tool for oil testing, oil recovery, water injection and reservoir reconstruction. In order to increase the pressure of the underground oil layer, and then increase the production of the oil production well, the method of water injection into the underground layer is adopted. At present, in order to improve the water injection efficiency, multi-stage packers are often used for isolation and simultaneous water injection in layers, so it is necessary to inject more water at a time. stage packer, which can not only save operating costs, but also improve oil displacement efficiency. However, the existing problem is: the multi-stage packer with a conventional structure cannot be separated and lifted during the unsealing and workov...

AI Technical Summary

Problems solved by technology

However, there is a problem: the multi-stage packer with a conventional structure cannot be separated and lifted during unsealing and workover operations due to the multi-stage series structure. Cause danger and affect the normal operation of the equipment

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