国内第一口TAML五级双分支井完井技术

针对川西地区气井产层多、压力梯度高、地层致密、岩性变化大等地质特点,研究了一套适合于天然气勘探开发需要的分支井完井工艺及其配套工具。采用相贯套技术,保证了主、支井眼连接处的力学完整性、机械稳定性;主、分支井眼均采用注水泥固井技术,在窗口挤入密封液,保证了主、支井眼连接处有较为可靠的液压密封性;在主井眼完井管柱上预置定向装置,保证了各分支井定向的准确性、连续性和简捷性;采用自动定位定向工具,保证各分支井眼的再进入性;应用预开孔套管、空心导斜器实现了主、支井眼的连通性;通过双油管和双封隔器的完井管柱实现了主井眼和分支井眼的层间压力分隔和分井压裂、分井采气。上述工艺在新浅90分支井中应用成功,圆满完成了国内第1口完井等级达到TAML5级标准的分支井。

Completion Technology of the First TAMI5 Double Lateral Well at Home

A set of completion technology and auxiliary tools for multi - lateral well is developed according to such geological characteristics as multiple production zones, high pressure gradients, dense formation and variability of litbology, etc in west Sichuan area. With the help of the auxiliary tools, the dynamic integrity and mechanical stability at the junction of main hole with branch hole may be achieved; both the main hole and the branch are cemented, and then squeeze sealing fluid at the window, thus more reliable hydraulic seal can be achieved at the junction of main hole with branch hole. A orienting facility is pre - set in the completion string, which ensures the accuracy, continuity and simplicity of the branch hole orientation; by applying auto- positioning and orientating tool,the re-entrance of each branch is ensured; by using the premilled casing and hollow whipstock, the communication between the main hole and branch is then established; zonal pressure isolation and separated fracturing and producing can be achieved through dual tubing string and dual packer. These technologies were successfully used in Well Xinqian - 90, which is double lateral well, and its completion level reached TAMLS.