摘要:
为了降低定向井摩阻扭矩,提高钻井速度,针对地质特点和钻井难点,建立了井眼轨道和岩石可钻性回归计算模型。通过五段制轨道剖面的优化,最优井眼曲率为(2畅85°~3°)/30 m、最大井斜角为30°;技术套管下至Sadi层8~15 m,确保了S型定向井安全钻进,裸眼内摩阻系数由0畅52降至0畅35,套管内摩阻系数由0畅35降至0畅28;Rus软硬夹层优选试验KM533复合钻头,解决了常规PDC钻头磨损快、牙轮钻头机械钻速低的问题。通过上述3项技术的研究与应用,鲁迈拉S型定向井实际顶驱扭矩降低30%以上,钻头使用数量降低2畅7只,钻井周期缩短18畅58 d。
Abstract:
In order to reduce the drag and torque in directional well drilling and increase the ROP, according to the geolog-ical conditions and drilling difficulties, a regression calculation model of borehole trajectory and rock drillability was estab-lished.By the optimization of 5-section trajectory sections, the optimal hole curvature 2.85°~3°/30m and maximum well angle 30°were determined, the intermediate casing was put down to sadi layer 8~15m to ensure the completion of S-shaped directional well.As the result, the friction coefficient in the open hole is reduced from 0.52 to 0.35 and casing in-ternal friction coefficient from 0.35 to 0.28.The quick wearing of conventional PDC bit and low ROP of cone bit are solved by optimization test on KM533 composite bit in RUS soft and hard interlayer.Based on the technical research and applica-tion, the actual top driven torque of Rumaila S-shaped directional well is lowered by more than 30%, the mumber of used bits is reduced by 2.7 and the drilling period is decreased by 18.58d.
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