石油工业技术监督

针对川中地区蓬莱气区寒武系地层与震旦系上下地层压力系数差异大、钻井风险的问题，及时准确卡取寒武系地层底界，下入技术套管封隔寒武系高压地层，成为该区域优化地质循环和控时钻进方案的关键。首先掌握区域资料、地质设计和邻井资料，然后深入研究蓬莱气区重点地层组合特征，结合录井参数和工程参数变化特征，建立起寒武系与震旦系地层跟踪卡层方法，有助于提高地层卡层成功率，减少井下复杂风险。结果表明：这种方法提高了蓬莱气区卡层准确率，最大程度地解决了筇竹寺、麦地坪组地层特征井间差异大带来的卡层难题。

In view of the significant difference in pressure coefficients between the upper and lower strata of the Cambrian and Sinian systems in the Penglai gas zone of central Sichuan, and the drilling risks, accurately and promptly capturing the bottom boundary of the Cambrian strata and inserting technical casing to seal the high-pressure Cambrian strata have become the key to optimizing the geological cycle and time-controlled drilling plan in this area. Firstly, regional data, geological design and offset well data were mastered, and then the characteristics of key formation assemblage in Penglai gas area were deeply studied. Combined with the variation characteristics of logging parameters and engineering parameters, the method of tracking stuck strata in Cambrian and Sinian strata was established, which was helpful to improve the success rate of formation stuck and reduce complex underground risks.The results show that this method has improved the accuracy of layer jamming in the Penglai gas area and solved the problem of layer jamming caused by the large inter-well differences in stratum characteristics of the Qiongzhusi and Maidiping Formations to the greatest extent.