Technology of double tubing's eccentric high pressure layered water injection in highly deviated wells

Zhang Dian oil field are mainly composed of highly deviated injection wells. Due to the influence of deviation, pressure, water quality and other factors, the problem of layered water injection steel wire fishing test in high-angle wells has become increasingly prominent. The existing technology is not ideal for separate injection in high deviated wells, which seriously restricts the separate injection in high deviated wells.Therefore, the eccentric dual-pipe high pressure separate injection technology in high deviated wells is studied. The eccentric water distributor can be lowered in the vertical section or in the position of small deviation after the pipe string is assembled. At the same time, the pipe string avoids the problems of plugging tools and pipe string such as sediment machine and scale, and solves the difficult problem of fishing test in high deviated wells.