A bridge-type layered water injection string and its operating technology

Abstract

The invention relates to the oil field separate layer water injection technology and support tools, in particular to a bridge type separate layer water injection string and an operation technology thereof.The bridge type separate layer water injection string is composed of a tubing string stretching and shrinking compensation tool, a string stabilizer, a water injection packer A, a bridge type eccentric water distributor T, a bridge type eccentric water distributor F, a bridge type packer, a water injection packer B and the like, wherein the tubing string stretching and shrinking compensation tool, the string stabilizer, the water injection packer A, the bridge type eccentric water distributor T, the bridge type eccentric water distributor F and the bridge type packer are placed on the vertical shaft section of a horizontal well, and other tools are placed on the horizontal section.The water injection rates of the an upper water injection layer section and a lower water injection layer section of the horizontal well are controlled by the bridge type eccentric water distributor T and the bridge type eccentric water distributor F respectively, so that separate layer water injection is achieved.Examining sealing, control and testing can be achieved through steel wire releasing and fishing or efficient cable testing and regulation, the stability of the string is high, the technology is mature and completed, and data credibility is high.

Description

technical field [0001] The invention relates to an oilfield layered water injection process and supporting tools, in particular to a bridge-type layered water injection string and its operating process. Background technique [0002] After the oil field is put into development, with the prolongation of the production time, the energy of the oil layer itself will be continuously consumed, resulting in a continuous drop in the pressure of the oil layer, a large amount of degassing of the underground crude oil, an increase in the viscosity, a great reduction in the production of the oil well, and even stop of spraying and production, resulting in underground A large amount of dead oil remains and cannot be recovered. In order to make up for the underground deficit caused by crude oil production, maintain or increase oil layer pressure, adjust plane and interlayer contradictions, achieve high and stable oil production, and obtain higher recovery ratios, layered water injection is...

AI Technical Summary

Problems solved by technology

The main defect of the above deployment and testing process is that the steel wire deployment test operation and the efficient cable deployment test are limited by the well deviation, especially not suitable for horizontal wells, and the construction of double-pipe or triple-pipe injection strings is cumbersome and costly

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