Pressurized set expansion packer and application method thereof

Abstract

The invention discloses a pressurized set expansion packer and an application method of the pressurized set expansion packer, and belongs to the field of expansion packers. The expansion packer includes an upper connector which is connected with an upper block bowl. The upper block bowl is connected with a rubber barrel, and the rubber barrel is internally sleeved with an outer central tube. The lower end of the rubber barrel is connected with a lower block bowl, and the lower end of the lower block bowl is connected with an outer barrel, and the lower part of the outer barrel is connected with a lower connector. An inner center tube is arranged between the upper connector and the lower connector. Setting fluid is arranged between the outer center tube and the inner center tube. A drain hole is arranged on the inner center tube. A pressurizing part is arranged between the outer barrel and the inner center tube. Since the expansion packer is provided with the pressurizing part, the pressure intensity of the setting fluid can be increased by several times compared with that in the internal center tube, and the problem that an existing expansion packer can not set effectively under low throttle pressure difference is solved. So the pressurized set expansion packer can meet the setting requirement under low throttle pressure difference to achieve a better layering effect, prevent interlayer fluid and pressure interference, and improve the efficiency of oil well production.

Description

technical field [0001] The invention relates to the field of expandable packers, in particular to an expandable packer that can be pressurized and set and a method for using the same. Background technique [0002] The implementation of polymer flooding and water injection well profile control in oilfield development is an effective means to solve the development contradiction between water flooding reservoirs and improve the effect of water flooding development. It has been widely used in the development of major water flooding oilfields. However, during the implementation process, the polymer solution and profile control and plugging agent injected into the well are mostly high-viscosity solution systems prepared by high-molecular polymers. If the throttling pressure difference is too large during the injection process, the long-chain structure of the polymer molecules will be destroyed. As a result, the viscosity of the solution system is greatly reduced, which affects the...

AI Technical Summary

Problems solved by technology

However, the conventional expandable packer cannot be effectively set under low choke pressure difference, and cannot meet the requirement of delamination

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