摘要:
海塔油田所钻井中螺旋井眼比例大,造成对比分层不准、油水层识别困难,给地质分层解释带来不利影响。为解决该问题,分析了螺旋井眼的产生机理;结合海塔油田地质特征和钻井施工现状,从地质因素和工程因素2方面研究了海塔油田产生螺旋井眼的主要成因;对钻井工具、钻头、钻井参数和钻井施工措施等进行了分析总结,形成了海塔油田预防螺旋井眼的技术措施。该技术措施的主要内容是:采用直螺杆钻进,弯螺杆纠斜,使用钟摆钻具组合以增大钻具组合刚度,稳定钻具的工作状态;采用保径钻头,降低钻头侧向切削井壁;控制钻压和钻速,及时修正井壁,保证井壁光滑。现场试验表明,该技术措施可大大降低螺旋井眼的发生概率,保证海塔油田地质分层和油水层识别准确及测井工作的顺利进行。
Abstract:
The difficulties in stratigraphic correlation and oil and water layer identification caused by the large ratio of spiral holes in Haita Oilfield have negative impact on the geologic stratigraphic division.In order to solve the problem,the creation mechanism of spiral holes were analyzed first;second,combined with the geological characteristics and drilling operation in Haita Oilfield,the main causes of spiral holes were investigated from geological and engineering factors.Technical measures to reduce the incidence of spiral holes were proposed for Haita Oilfield through the research on drilling tools,bits,drilling parameters and drilling measures and on-site technical problems.These measures include:in terms of drilling assembly,use the straight hosing PDM in drilling,beat hosing PDM in well straightening.Stiffness of drill string will be effectively increased with the use of pendulum BHA;with respect to bit type selection,gauge protecting bit should be used to lower the lateral cutting on the borehole wall;in drilling operation,WOB and ROP should be controlled,borehole wall should be fixed in a timely to manner ensure its smoothness.Field tsets showed these technical measures could reduce the incidence of spiral holes significantly,laying sound foundation for accurate stratigraphic division,oil water layer identification in Haita Oilfield.
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