摘要
苏里格气田东区北部上古生界气藏原始压力系数低,并且随采出程度的增加目前地层压力系数降低至0.4,因该区域经压裂改造后的水平井对井筒沉积物清理过程中有较高的储层保护和工艺安全要求,常规的冲砂、清砂工艺存在局限性。借鉴水平井欠平衡钻井和吐哈油田直井氮气钻磨桥塞的成功案例,以Boyun Guo和Ali Ghalambor等人的研究结果为基础,建立了井底流压、固相携带能力、施工压力和井口流速4种数学模型,并基于数学模型的计算和预测结果,于2023—2024年在苏里格气田试验应用连续油管气液混相钻冲砂6井次,单井日增气均超过2.5×104 m 3/d。试验井的随钻电子压力计数据结果显示,实测井底流压值与理论计算结果吻合,证实井底流压计算核心数学模型的准确可靠。该研究为同类井解堵增产提供了一种全新的解决方法。
The original pressure coefficient of Upper Paleozoic gas reservoir in the northern part of East Sulige Gas Field is low,and with the increase of production degree,the formation pressure coefficient can be lower than 0.4.Because the fractured horizontal wells in this area have strict requirements for reservoir protection and process safety in the process of wellbore sediment cleaning,conventional sand flushing and sand clearing have limitations.Based on the research results of Boyun Guo and Ali Ghalambor,four mathematical models of bottom-hole flow pressure,solid phase carrying capacity,pump pressure and wellhead flow rate are established.Based on the calculation and prediction results of the mathematical model,from 2023 to 2024,the continuous tubing gas-liquid miscible drilling and sand flushing were tested and applied in Sulige gas field for 6 times,and the gas production increase per well exceeded 25×103 m 3/d.The data playback results of electronic manometer about wellⅣshow that the measured bottom-hole flow pressure is consistent with the theoretical calculation results,which confirms the accuracy and reliability of the core model.This study provides a new method for plugging removal and stimulation of similar wells.
作者
邹长虹
宋权
王永康
兰勇
高如军
刘慎成
刘云见
ZOU Changhong;Song Qua;WANG Yongkang;LAN Yong;Gao Rujun;LIU Shencheng;LIU Yunjian(Tuha Downhole Operation Company of Xibu Drilling Engineering Company Ltd.,CNPC,Shanshan,Xinjiang 839009,China;Southwest Project Department of Xibu Drilling Engineering Company Ltd.,CNPC,Chengdu,Sichuan 610051,China;Sulige Gasfield Branch of Xibu Drilling Engineering Company Ltd.,CNPC,Wushenqi,Inner Mongolia 017300,China;Drilling&Production Technology Research Institute of CNPC Chuanqing Drilling Engineering Co.,Ltd.,Guanghan,Sichuan 618300,China)
出处
《钻采工艺》
CAS
北大核心
2024年第5期88-93,共6页
Drilling & Production Technology
基金
国家自然科学基金(面上)项目“华北克拉通怀安地体泥质麻粒岩的变质—深熔作用研究及其地质意义”(编号:42072225)。
关键词
连续油管
水平井
气液混相钻冲砂
固相携带能力
井底流压
coiled tubing
horizontal wells
gas-liquid miscible drilling sand flushing
solid phase carrying capacity
flowing bottomhole pressure
