摘要
黄草峡储气库在实钻中存在浅表层震动大、三叠系须家河组机械钻速慢、嘉陵江组膏盐层定向困难、井漏复杂处理时间长、含硫目的层井漏转溢流速度快等钻井难点,制约了钻井提速。基于第1轮钻井资料分析了地层特征对钻井的要求,对钻具组合优化、井漏快速处理、目的层安全钻完井进行归纳总结。采用了如下对策:(1)表层须家河组钻进?660.4 mm井眼采用“牙轮钻头+钻铤”钻具组合,?406.4 mm井眼采用“复合钻头+螺杆”钻具组合能够实现快速安全钻进;(2)嘉陵江组大井眼采用“欠尺寸螺杆扶正器+?203.2 mm钻铤+加重”定向组合钻具,有效缓解了定向托压;(3)须家河组井漏采用清水强钻,嘉陵江组井漏采用“刚性粒子+桥塞”堵漏,能够快速处理井漏复杂;(4)含硫低压目的层在钻遇井漏失返后,采取关井反推配合压裂车连续吊灌方式,能够保障H2S不溢出至地面从而进行安全钻完井作业。应用结果证实:通过集成应用系列钻井技术,第2轮单井最快钻井周期缩短至38.26d,周期同比降低36%,故障时率同比降低39%。
There exist drilling difficulties in Huangcaoxia underground gas storage(UGS),such as big vibration in superficial zones,low rate of penetration(ROP)in the Triassic Xujiahe Formation,inconvenient directional drilling in gypsum salt rocks of Jialingjiang Formation,much longer treatment of complex lost circulation,and quick conversion from lost circulation to overflow in sulfur reservoirs,which may restrict ROP increase.Thus,formation characteristics to drilling requirements were analyzed in the light of the last drilling data.And some information was summarized in terms of the optimization of bottom hole assembly(BHA),rapid lost-circulation treatment,and safe drilling and completion.Four countermeasures were taken as follows:(i)in the superficial Xujiahe Formation,one BHA of both cone bit and drill collar was utilized to drill theØ660.4 mm borehole,and the other of multiple drill bits and screws for the borehole ofØ406.4 mm,all achieving fast and safe drilling;(ii)in Jialingjiang Formation,an oriented BHA combined the under-sized screw centralizer,the drilling collar withØ203.2 mm with the heavy wall drill pipe,was introduced to alleviate directional backing pressure;(iii)the forced drilling with fresh water was available for the lost-circulation treatment in Xujiahe Formation while both rigid particle and bridge plug for Jialingjiang Formation,which might tackle complex lost circulation immediately;and(iv)in coordination with continuous hanging irrigation via fracturing trucks,the shut-in reverse propulsion was employed after lost circulation came across the sulfur target with low pressure to promise H2S not spill over to the surface and thus implement the safe drilling and completion.As a result,through these drilling technologies,the fastest cycle is shortened to 38.26 days in the second drilling period,36%lower than in the last cycle,and the accident time ratio is reduced by 39%.
作者
黄兵
汪勇
王明华
陈涛
卓云
王成学
杜江
HUANG Bing;WANG Yong;WANG Minghua;CHEN Tao;ZHUO Yun;WANG Chengxue;DU Jiang(Chuandong Drilling Company,CNPC Chuanqing Drilling Engineering Company Limited,Chongqing 401147,China;International Ltd.,CNPC Chuanqing Drilling Engineering Company Limited,Chengdu,Sichuan 610051,China)
出处
《天然气勘探与开发》
2024年第6期80-86,共7页
Natural Gas Exploration and Development
基金
中国石油集团川庆钻探工程有限公司(编号:CQ2020B-7-3-3)。
关键词
储气库
漏转溢
井漏失返
定向托压
快速安全钻进
吊罐
UGS
Conversion from lost circulation to overflow
Lost circulation in return
Directional backing pressure
Fast and safe drilling
Hanging irrigation
