ф508mm隔水导管开窗侧钻技术

Window sidetracking technology for ф508 mm riser

海上油气开发通常使用丛式井方式,槽口内隔水导管大部分采用锤入法下入,必然会导致个别隔水导管变形、受损等问题,引起槽口的变形。同时,受隔水导管的强度、入泥的深度等多种因素的限制,受损槽口一般不能被再利用。为解决此难题,实现变形、受损槽口的有效利用,以锦州25-1南油田WHPA平台变形ф508 mm隔水导管为例,通过优选Smith开窗工具、加固隔水导管、合理控制钻压、优选开窗点、优化轨迹控制等措施,顺利实现了隔水导管的开窗侧钻作业。该配套侧钻技术在国内首次应用,其成功经验为其他平台变形、受损隔水导管槽口的再利用提供了借鉴,有较好的应用前景。

The development of offshore oil and gas is usually by way of cluster wells. Due to the particularity of offshore oil fielddevelopment, most of the riser in the slot is driven in by hammering, which will certainly cause deformation or damage to some risersand cause deformation of the slot. Meanwhile, being limited by the riser strength, depth into the soil, etc., the damaged slot shall usuallynot be used again. So in order to solve this problem and realize efficient use of deformed and damaged slots, this paper took the deformedΦ508 mm riser on WHPA platform in Jinzhou 25-1 oilfield as an example and successfully carried out window sidetracking through riserby optimally selecting the Smith window cutting tools, strengthening the riser, reasonably controlling weight on bit, optimally selectingthe window point and optimizing the trajectory control. This supporting sidetracking drilling technology was first used in China, and itssuccessful experiences provide reference to the reuse of deformed and damaged risers in other platforms, and so it enjoys a favorableapplication prospect.