Self-expanding anti-scaling water injecting packer

Abstract

The invention belongs to the technical field of an oilfield downhole tool and particularly relates to a self-expanding anti-scaling water injecting packer. In the self-expanding anti-scaling water injecting packer, annular space B is reserved between a protective cylinder and a center pipe; a lower balance piston is arranged in the annular space B; the lower balance piston divides the annular space into upper and lower chambers; the upper chamber is a non-sealed chamber and the lower chamber is a sealed chamber; a soluble release plug is arranged below the lower chamber; liquid column pressurein the oil sleeve annular space serves as seat sealing power, the pressing link of a pressing vehicle is canceled, operation cost is greatly reduced, operation period is reduced, and the current industrial and social requirements of energy saving, consumption reduction and income increment are met; a seat sealing pin is replaced by the release plug, the release plug is made of a soluble metal material, factors such as material strength, components and processing and manufacturing are easy to control, and the seat sealing reliability is greatly improved; and upper and lower anti-scaling sleeves are provided, so the related surface can be prevented from being scaled, the fact that a tool can reset smoothly is guaranteed and the defects in the conventional water injecting packer are avoided.

Description

technical field [0001] The invention belongs to the technical field of oil field downhole tools, in particular to a self-expanding anti-scaling water injection packer. Background technique [0002] Layered water injection means that a packer is lowered into the water injection well to separate the oil layers with large differences, and then the water distribution device is used to distribute water in layers, so that the water injection volume of the high permeability layer can be controlled, and the water injection of the middle and low permeability oil layers can be obtained. Enhanced, a water injection method that enables all types of oil layers to play a role. [0003] The packer that needs to be used in layered water injection is called water injection packer. The current conventional water injection packer has the following shortcomings: 1. The conventional water injection packer generally adopts the hydraulic setting type of pressing truck, which undoubtedly greatly in...

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Problems solved by technology

[0004] In order to solve the problems in the background technology, the present invention provides a self-expanding anti-scaling water injection packer, which can be set without pressure during the setting process of the present invention, and at the same time avoids the problem of poor reliability of the previous setting pins, and When unsealing, the rubber cartridge rebounds smoothly, returns better, the pipe string is easy to pull out, the rubber cartridge is less damaged, and the reuse rate is improved

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