Pre-filling self expansion packer for well completion

Abstract

The invention relates to a pre-filling self expansion packer for well completion. A position limiting ring A and a position limiting ring B are respectively positioned at both ends outside a base pipe and are fixed through clamping a clamp ring A and a clamp ring B fixed in outer wall grooves of the base pipe into grooves arranged on the inner walls of the position limiting ring A and the position limiting ring B, the part between the inner wall of the position limiting ring A and the outer wall of the base pipe as well as the part between the inner wall of the position limiting ring B and the outer wall of the base pipe are respectively sealed by an O-shaped sealing ring A and an O-shaped sealing ring B, a porous separation tube is sheathed on the outer wall of the base pipe, is arranged between the position limiting ring A and the position limiting ring B and is fixed on the position limiting ring A and the position limiting ring B through a screw A and a screw B, expansion media are filled in an annular cavity formed between the inner wall of the porous separation tube and the outer wall of the base pipe, expansion rubber is vulcanized onto the outer wall of the porous separation tube when meeting oil, and the expansion media and the rubber expending when meeting the oil are communicated through seeping holes arranged on the porous separation tube. The pre-filling self expansion packer has the advantages that the structure is simple, the installation and the construction operation are convenient, the packing time is short, the packing pressure difference is great, the well completion time of the permeability reservoir is greatly shortened, the operation cost is reduced, and the operation risk caused by untight packing of the packer is reduced.

Description

technical field [0001] The invention relates to a pre-packed self-expandable packer for downhole well completion in an oil field. Background technique [0002] Oil-expanding packer is a new type of packer developed in oil fields in recent years. At present, the common oil self-expanding packer mainly relies on its own rubber to absorb crude oil downhole to expand and seal the formation, and it does not have a medium for expansion - crude oil. When the self-expanding packer in contact with oil is completed in a low-permeability reservoir, due to the lack of sufficient crude oil supply for the packer rubber sleeve, the rubber sleeve cannot effectively expand and seal the pressure, which seriously affects the operation process and completion efficiency. In the field, diesel oil is sometimes injected into the well to accelerate the expansion and setting of the self-expandable packer in contact with oil, but it will eventually increase the operation process of the packer, increa...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a pre-packed self-expandable packer for oil field completion, to overcome the shortcomings of the existing common self-expandable packer when completing wells in low-permeability reservoirs, such as long setting time and complicated completion process , ultimately improving the completion efficiency of low-permeability reservoirs and reducing the completion cost

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