迪北区块深层致密砂岩气藏氮气钻完井技术应用及认识  

Application and Understanding of Nitrogen Drilling and CompletionTechnology in Deep Tight Sandstone Gas Reservoirs in the Dibei Block

作　　者：王春生[1] 冯少波[1] 龙敏 李宁[1] 梁红军[1] 张权[1] 秦宏德[1] 滕志想 WANG Chunsheng;FENG Shaobo;LONG Min;LI Ning;LIANG Hongjun;ZHANG Quan;QIN Hongde;TENG Zhixiang(PetroChina Tarim Oilfield Company,Korla,Xinjiang 841000,China)

机构地区：[1]中国石油塔里木油田公司,新疆维吾尔自治区841000

出　　处：《钻采工艺》2024年第1期16-23,共8页Drilling & Production Technology

基　　金：中国石油集团公司科技专项“超深层碎屑岩油气规模增储上产与勘探开发技术研究”(编号:2023ZZ14)之课题六“超深层高温高压井钻井关键技术研究与试验”(编号:2023ZZ14-06)。

摘　　要：针对塔里木油田迪北区块目的层阿合组致密砂岩储层岩性致密、地层压力高、煤层发育,应用常规液体介质的钻完井技术对储层损害严重,为此特引入氮气钻完井技术,并在DX1井开展现场试验,获得日产气量82.39×104m3,日产油量100.8 m3的高产。但由于地层岩性的复杂性,氮气钻完井过程中,出现了井壁垮塌严重、内防喷工具失效、井控装备冲蚀等问题,制约了氮气钻完井技术在该区块的推广应用。通过对井身结构、钻具组合、井口装备、排砂管线、内防喷工具以及配套工艺流程等关键工艺、装备的改进优化,形成适用于高压高产深层致密砂岩储层的氮气钻完井配套工艺技术,并在DB104井开展了现场试验,试验效果显著。与同区块液体介质钻井的钻完井方式相比,DB104井日产气增加了400余倍,日产油量增加了6倍。通过DX1井和DB104井证明,只要工艺、装备、措施得当,氮气钻完井技术在迪北区块这类高温高压深层致密砂岩气藏中对储层具有重要的保护作用,可为塔里木油田乃至全国高压高产致密砂岩储层的高效勘探开发提供技术支撑。Targeting the tight sandstone reservoirs of the Ahe Formation in the Dbei Block of the Tarim Oilfield,characterized by dense lithology,high formation pressure,and developed coal seams,the conventional liquid-based drilling and completion technology significantly damages the reservoir.Therefore,nitrogen drilling and completion technology was introduced and field-tested in the well DX1,achieving high production with a daily gas output of 82.39×104 m 3 and a daily oil output of 100.8 m 3.However,due to the complexity of the formation lithology,severe wellbore collapse,failure of internal blowout prevention tools,and erosion of well control equipment occurred during the nitrogen drilling and completion process,limiting the widespread application of this technology in the block.Improvements and optimizations in key processes and equipment,including wellbore structure,bottom hole assembly,wellhead equipment,bleed off ling,internal blowout prevention tools,and accompanying technological processes,a suitable nitrogen drilling and well completion technology for high-pressure,high-yield tight sandstone reservoirs was developed.This technology was field-tested in the well DB104,showing significant results.Compared to the liquid-based drilling and completion methods in the same block,the daily gas production of DB104 well increased by more than 400 times and the daily production increased by 6 times.The wells DX1 and DB104 demonstrate that with proper techniques,equipment,and measures,nitrogen drilling and completion technology can effectively protect the reservoir in high-temperature,high-pressure,deep dense sandstone gas reservoirs in the Dibei Block.This technology provides technical support for efficient exploration and development of high-pressure,high-yield,dense sandstone reservoirs in the Tarim Oilfield and across the country.

关 键 词：迪北区块 高压高产 深层致密气藏 氮气钻完井 储层保护 

分 类 号：TE24[石油与天然气工程—油气井工程] TE257