延安气田志丹区块完钻电测遇阻分析及对策

Analysis and Countermeasures of Resistance Encountered in Electrical Logging After Drilling Completion of Zhidan Block of Yan’an Gas Field

延安气田志丹区块的完钻电测存在电测遇阻率高的问题,为了探索完钻电测遇阻的原因及技术对策,针对区块的钻井电阻情况进行了统计研究,提出了"大肚子井眼""糖葫芦井眼""井眼台阶""电测施工前准备不充分"4大主要电测遇阻原因,采取了施工预报、井眼轨迹优化、加强施工管控、电测前充分准备、测井工艺优化等5大措施对其进行了优化,电测遇阻率得到了大幅下降。

In Zhidan block of Yan’an gas field,there is a problem of high resistance rate in electrical logging after drilling.In order to explore the causes and technical countermeasures of high resistance rate in electrical logging after drilling,a statistical study on the resistance condition in electrical logging of the block was carried out,and four main causes of resistance in electrical logging were put forward,including"big belly well","Tanghulu well","well step"and"inadequate preparation before electrical logging",and five measures were used to optimize it,including engineering prediction,well trajectory optimization,strengthening construction control,full preparation before electrical logging,and optimization of logging technology,which can greatly reduce the resistance rate of electrical logging.