松辽盆地北部深层天然气勘探钻井完井保护技术

RESERVOIR PROTECTION TECHNOLOGY APPLIED DURING DRILLING AND COMPLETION OPERATIONS IN DEEP GAS EXPLORATION ACTIVITIES IN NORTH SONGLIAO BASIN

通过对松辽盆地深层勘探钻井完井技术的简要回顾,指出保护储层的钻井、完井技术所经历的“采用优质钻井完井液体系,实现对储层的保护;使用低密度钻井液提高钻井速度,近平衡钻井对储层的发现与保护和采用欠平衡钻井工艺技术,发现与保护储层”3个阶段分别满足深层勘探就钻井完井过程中保护储层的技术要求。针对深层储层物性和钻井技术条件,研究了储层潜在损害方式和损害程度,分析了各个阶段钻井完井过程中保护技术的作用原理、应用情况与取得的效果。实践表明,保护储层应以勘探发现程度需求为依据,兼顾资料需求和勘探钻井投资,选择相应的保护储层类别。建议加强松辽盆地北部深层天然气勘探钻井、完井过程对储层的保护,探索进一步开展充气、泡沫、雾化、空气等气体钻井技术的研究与应用,使储层发现与保护技术得到一个质的飞跃。

Through a brief review of the drilling and completion technologies used in deep exploration wells in the Songliao Basin, the evolution of the reservoir protection technology can be classified into 3 stages, at the first stage low-density drilling fluid is used to increase drilling speed, at the second stage the near-balance drilling technology is used to discover reservoirs, and at the third stage the underbalanced drilling technology is used to protect and discover reservoirs. Based on the physical properties of the deep reservoirs and the drilling technology status, the potential reservoir damage modes and the damage levels are studied, the working principles and application results of the 3-stage reservoir protection technologies are analyzed. It concludes that the determination of proper reservoir protection measures shall be based on exploration discovery requirements, and shall take into consideration the data acquisition requirements and exploration drilling investment. Greater efforts are recommended to strengthen reservoir protection during drilling and completion operations during deep gas exploration in north Songliao Basin, and to probe for technical development and application of aerated drilling, foam drilling, mist drilling, and air drilling, etc., to bring up the reservoir discovery and protection technology to a new level.