Down-hole packer based on shape memory materials

Abstract

The invention provides a down-hole packer based on shape memory materials. The down-hole packer based on shape memory materials comprises a rubber sleeve, a fixed end assembly and a floating end assembly. The rubber sleeve made of shape memory polymer materials is sleeved in the outer side of a pipe body, an extensile spiral pipe is embedded in the rubber sleeve, and a liquid inlet is arranged on the side wall of the pipe body. The fixed end assembly is sleeved on the pipe body and connected with the upper end of the rubber sleeve, the fixed end assembly is provided with a fixed end limit ring and a middle connector connected with the rubber sleeve, the middle connector is provided with a liquid inlet channel, one end of the extensile spiral pipe penetrates out of the upper end of the rubber sleeve to be communicated with the liquid inlet channel relatively, an over-flow sliding sleeve penetrates in the fixed end limit ring in a connecting mode, and the liquid inlet of the pipe body is opposite to the over-flow sliding sleeve. The floating end assembly is provided with a floating end limit ring which is sleeved on the pipe body and connected with the lower end of the rubber sleeve, the floating end limit ring is provided with a liquid outlet channel, and one end of the extensile spiral pipe penetrates out of the lower end of the rubber sleeve to be communicated with the liquid outlet channel relatively. The down-hole packer based on shape memory materials can meet requirements for well completion of complex structural wells with different well conditions and is controllable in setting, small in overall size and simple in structure.

Description

technical field [0001] The invention relates to a downhole packer, in particular to a downhole packer based on a shape memory material for oil and gas wells for oil and gas development. Background technique [0002] As the national economy's demand for oil and natural gas energy continues to increase, the development of oil and gas resources has gradually shifted from focusing on conventional resources to focusing on both conventional and unconventional resources. At the same time, the well types for developing oil and gas reservoirs are becoming more and more complex, such as extended-reach horizontal wells, multilateral wells, etc., which put forward high requirements for completion tools including packers. Packers are important downhole interlayer isolation tools for oil and gas production, and are widely used in fields such as well completion, oil production, water injection, reservoir stimulation, and downhole operations. [0003] At present, the packers are mainly of ...

AI Technical Summary

Problems solved by technology

Existing mechanical packers still have many deficiencies: poor setting reliability, high cost, large size, complex structure that makes it difficult to go into the well, high construction risk, and poor adaptability to open-hole wells, etc.

The tool has no complicated mechanical structure, and only relies on the oil-absorbing or water-absorbing expansion of the rubber tube made of special rubber to seal, and the on-site construction process is simple. Disadvantages such as being affected by the properties of the liquid in the wellbore

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