SUBDIVIDED LAYERS WATER INJECTION TECHNOLOGY IN THICK PRODUCTION FORMATION BY HYDRAULIC RUNNING AND PULLING

A subdivided layer water injection technology through hydraulic running and pulling method is developed, according to some problems of conventional separate layer water injection technology in thick production interval. By hydraulic means, the pipes can be run and pulled within the same time. It also can test flow rate and regulate water nozzles in five injecting zones simultaneously with higher efficiency. A packer can be set and sealed accurately in the minimum setting interval of 0.89m with mini sticking and sealing distance of 1.8m by mechanical tubing string locator, allowing for successive thin interbred and injection layers to be water injected subdivided. The type of injecting string is hanging one at wellhead, suit for both shallow and deep and deviated wells. Some 14 well field trials showed that the success rate and the effective rate are 100%.