致密砂岩气藏压后返排技术设计优化研究  

Study on optimization of flowback technology after pressure in tight sandstone gas reservoir

作　　者：张盼盼 杨开利 蒲阳峰 张明浪 ZHANG Panpan;YANG Kaii;PU Yangfeng;ZHANG Mingang(Shaanxi Yanchang Petroleum(Group)Co.,Ltd.,Yulin 718500,Shaanxi China)

机构地区：[1]陕西延长石油(集团)有限责任公司延长气田采气二厂,陕西榆林718500

出　　处：《粘接》2023年第10期130-133,共4页Adhesion

摘　　要：致密砂岩气藏的开发随着时间的推移会产生诸多问题,例如气藏压裂过程中返排能力的下降和水锁效应的产生。为此,以液氮的性质为基础,利用其特性对气藏的压裂方式进行了优化,然后通过实验和计算对优化后的液氮增能压裂效果进行研究。为了减少水锁损害对气藏压裂产生的影响,对水锁损害进行了模拟试验研究。研究结果表明,加入液氮对于井底液柱的压力、返排压差均有积极影响,影响水锁损害程度的因素有气藏的自吸程度和其所受的压力大小。The development of tight sandstone gas reservoir will produce many problems with the passage of time,such as the decline of flowback ability and the generation of water lock effect in the process of gas reservoir fracturing.Therefore,based on the properties of liquid nitrogen,the fracturing method of gas reservoir is optimized by using its characteristics,and then the optimized liquid nitrogen energy increasing fracturing effect is studied through experiments and calculations.At the same time,in order to reduce the impact of water lock damage on gas reservoir fracturing,the simulation test of water lock damage is carried out.The results show that the addition of liquid nitrogen has a positive effect on the pressure of bottom hole liquid column and backflow pressure difference.In addition,the factors that affect the damage degree of water lock include the degree of self absorption of the gas reservoir and the pressure it is subjected to.

关 键 词：致密砂岩气藏 返排技术 液氮 水锁损害 设计优化 

分 类 号：TQ126.2[化学工程—无机化工]