垦利16-1油田浅层大位移井钻井关键技术

Key technologies of shallow extended-reach well drilling in KL16-1oilfield

垦利16-1油田位于渤海南部海域,是典型边际油田,该油田油藏埋深浅且存在大段疏松砂岩地层,为大位移井钻井带来轨迹控制困难、井眼延伸难度大等难题。笔者从地质背景出发,分析了研究区域大位移井钻井的技术难点,以KL16-1-A25井为例,分析了浅层大位移井关键钻井技术。研究表明,井眼轨迹控制技术、井下工况监测与控制技术的应用对于精确控制浅层大位移井的轨迹具有良好的应用效果,尤其是TruLink工具的应用实现了动态连续测斜、Optidrill系统的应用动态实时反映井下状况等,有效保障了大位移井眼的持续延伸;钻井液优化技术能够显著提高浅层大位移井钻井液的携岩性、润滑性和封堵性;PCLET YK水泥浆体系和加长胶塞的应用有效保障了浅层大位移井的固井质量。本文研究成果对渤海油田浅层大位移井的钻井作业具有良好的借鉴作用,可为渤海油田增储上产提供有力的技术支持。

KL16-1 oilfield,located in the southern Bohai sea,is a typical marginal oilfield,and extended-reach well development is an important way to develop it.However,the oil reservoir of KL16-1 oilfield is buried in shallow depth and there are large sections of unconsolidated sandstone formations,so the difficulty of trajectory control and borehole extension restricts the economic and effective development of the oilfield.Based on this,the author describes the technical difficulties of drilling extended-reach wells in the study area from the geological background,then introduces the drilling technology of shallow extended-reach wells,and introduces the application effect of the above drilling technology with the example of Well KL16-1-A25.It has been proved that the application of borehole trajectory control technology,downhole condition monitoring and control technology has good application effect for accurately controlling the trajectory of shallow extended reach well,especially the application of TruLink to realize dynamic continuous survey and Optidrill system to reflect downhole conditions dynamically and in real time,effectively ensuring the continuous extension of extended reach well.Drilling fluid optimization technology can significantly improve the carrying lithology,lubricity and plugging property of drilling fluid in shallow extended reach wells.The application of PC-LET YK cement system and extended plug effectively ensures the cementing quality of shallow extended reach wells.This study offers good technical reference for shallow extended-reach well drilling in Bohai oilfield,and also provides strong technical support for increasing reservoir and production in Bohai oilfield.