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用减小套管柱间隙 [(小间隙井身结构(RCCP) ]的方法钻井是很有价值的。这种新技术可以在上层套管下钻出扩大的井眼 ,尤其是在定向井和水平井中更是如此。RCCP有助于降低钻井费用。在海上深井中要增大油层套管的尺寸 ,同时要不改变表层套管和防喷器 (BOP)的额定压力等级 ,这就要求使用RCCP。在当前的油价条件下 ,RCCP不仅适用于深井 ,也适用于许多其它的井。实施RCCP的必要工具和技术不断提高。本文讨论的随钻扩眼 (EWD)和可变径稳定器 (ES)可以通过RCCP降低钻井费用。这些工具将使RCCP的应用更加广泛。EWD随钻扩眼器可以钻套管内的水泥塞 ,并能在钻穿套管鞋后继续随钻扩眼钻进。变径稳定器可以在直井或定向井的扩眼段有效地稳定下部钻具组合 ,其功能与常规尺寸井眼中的一体式稳定器一样。本文提出了一种推荐的RCCP ,描述了EWD和ES工具的开发以及在RCCP和常规井中的应用实例
It is valuable to drill wells that reduce casing string clearance [(RCCP)], a new technique that allows for the drilling of enlarged boreholes below upper casing, especially in directional wells and This is especially true in horizontal wells, where RCCP helps to reduce drilling costs, increasing the size of casing in offshore deep wells without changing the rated pressure rating of surface casing and blowout preventers (BOPs) RCCP. Under the current oil price conditions, RCCP is not only suitable for deep wells but also for many other wells. The necessary tools and techniques for implementing RCCP are constantly being improved. The Rewinding Reaming (EWD) and Variable Path Stabilizers ES) Reduce drilling costs via RCCP These tools will make the RCCP more widely available.EWD Rewind Reamers can drill cement plugs in bushing and continue to ream as the bores are drilled after drilling the bushing shoes. The variable-diameter stabilizer effectively stabilizes the lower-hole assembly in the reaming section of a vertical well or a directional well and performs the same function as an integrated stabilizer in a conventional-size wellbore A recommended RCCP is presented in this paper that describes EWD and ES Tool development as well as in RC CP and conventional wells in the application of examples