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膨胀坐挂定位分支井技术是国家863“可控(闭环)三维轨迹钻井技术”研究课题分支井钻完井技术研究内容及关键技术。膨胀坐挂定位分支井技术具有以下特点:①采用膨胀管作为坐挂工具,操作简便;②可对老井套管起到保护作用,无需采用传统的卡瓦式坐挂工具;③膨胀管坐挂膨胀后留在井筒内的内径大,便于下入修井工具及井下作业。该项技术首次用于渤海NB35-2油田244.5mm套管井获得成功,为渤海复杂河流相沉积油藏后期调整积累了经验,对于有效降低我国海上油田开发成本具有重要意义。
Expansion of the sit-positioning branch well technology is a national 863 “controlled (closed-loop) three-dimensional trajectory drilling technology” research topic branch well drilling and completion technology research content and key technologies. Expansion of the seated positioning branch wells technology has the following characteristics: ① expansion tube as a hanging tool, easy to operate; ② can play a protective role of the old casing, without using the traditional slip-sitting tools; ③ expansion tube sit Hanging in the wellbore after inflation expansion within the large diameter, easy access to workover tools and downhole operations. This technique was firstly applied to the 244.5mm cased hole in the Bohai NB35-2 oilfield and gained experience for the post-adjustment of the complex marine fluvial sedimentary reservoir in the Bohai Sea, which is of great significance for effectively reducing the development cost of offshore oilfields in China.