气体钻井高效开发致密砂岩气藏的典型案例分析  

A Typical Case Analysis of Gas Drilling for Efficient Development of Tight Sandstone Gas Reservoirs

作　　者：李皋 张毅[1,2] 杨旭 胥志雄[3] 何龙 龚汉渤[4] LI Gao;ZHANG Yi;YANG Xu;XU Zhixiong;HE Long;GONG Hanbo(National Key Laboratory of Oil and Gas Reservoir Geology and Exploration,Chengdu,Sichuan 610500,China;Southwest Petroleum University,Chengdu,Sichuan 610500,China;PetroChina Tarim Oilfield Company,Korla,Xinjiang 841000,China;Sinopec Southwest Oil and Gas Branch,Chengdu,Sichuan 610041,China)

机构地区：[1]油气藏地质及开发工程全国重点实验室,成都市610500 [2]西南石油大学 [3]中国石油塔里木油田公司 [4]中国石化西南油气分公司

出　　处：《钻采工艺》2024年第1期30-38,I0001,共10页Drilling & Production Technology

基　　金：国家重点研发计划课题“超快响应湿度传感器在油气勘探、工业监控等领域的应用验证”(编号:2023YFB3210205)。

摘　　要：目前气体钻井开发致密砂岩气藏是否高效建产受多方面制约,建产机理尚不清晰,阻碍了气体钻井发挥技术优势。为此,文章选取塔里木迪北地区和川西地区的典型高产井为研究对象,在综合分析随钻资料的基础上,探究了高效建产的共性特征。研究发现,产气点的井深与砂泥岩岩性界面存在高度相关性,证实了岩性界面处发育的缝网系统是有利渗流通道;有水致密气藏中,受断裂带影响,地层水在断层下降盘上部富集概率高,部署在断层上升盘的井产水程度低,加之岩性界面缝的存在,使气水实现同产、稳产。分析认为,井位部署应以构造高部位和断层上升盘为依据,确保气源富集的同时避免水体突进,井轨迹应将岩性界面缝作为重点穿越目标,上部井段下套管应避免完全封隔目的层泥岩段,以充分释放岩性界面缝的产气潜力。未来还应加强技术攻关,提升气体钻井钻穿复杂砂泥岩互层的能力。Currently,the efficient establishment of production in tight sandstone gas reservoirs through gas drilling is constrained by various factors,and the unclear production mechanism hinders the technical advantages of gas drilling.Therefore,selecting typical high-yielding wells in the Dibei and Western Sichuan areas as research subjects,a comprehensive analysis of drilling data was conducted to explore the common characteristics of efficient production establishment.The study found that the well depth of the gas production points is highly correlated with the sandstone and mudstone lithological interfaces,confirming that the fracture network system developed at the lithological interfaces is a favorable permeability channel.In water-rich tight gas reservoirs affected by fault zones,there is a high probability of formation water enrichment in the upper part of the fault′s downthrown side.Wells deployed on the upthrown side of the fault have a lower degree of water production,and the presence of fractures at the lithological interfaces enables simultaneous and stable gas and water production.The analysis suggests that well site deployment should be based on structural high positions and the upthrown side of faults to ensure gas source enrichment while avoiding sudden water influx.The well trajectory should target fractures at lithological interfaces,and the upper well section should avoid completely sealing the target mudstone layers with casing,to fully release the gas production potential of the fractures at the lithological interfaces.Future efforts should also focus on strengthening technical breakthroughs to enhance the capability of gas drilling through complex interbedded sandstone and mudstone.

关 键 词：致密砂岩气藏 气体钻井 岩性界面缝 井位部署 

分 类 号：TE24[石油与天然气工程—油气井工程]