摘要
陇东铝土岩属于长庆油田重要的资源接替储层,近期完试的陇**井、宁**井在太原组铝土岩勘探获得重大突破。针对该类储层溶孔和裂缝发育,井壁垮塌、漏失风险高及井眼清洁能力差的技术难题,通过铝土岩物性参数、理化性能、力学性能和敏感性测试分析等,明确了陇东铝土岩主要坍塌因素,研发出适用于铝土岩安全钻进的快封堵防塌钻井液技术。该体系在170℃高温高压滤失量小于10 mL,钻井液二次回收率大于91%,铝土岩样品在钻井液体系中浸泡15 d后和清水浸泡15 d后的抗压强度相比提升81.8%。快封堵防塌钻井液技术在长庆首口铝土岩水平井陇4**井进行了试验应用,助力该井700 m水平段的安全钻进,该井投产获日产无阻流量3.53×10^(6)m^(3)高产气流,创鄂尔多斯盆地上古生届勘探开发50多年新纪录,为该类储层的勘探开发提供了技术支撑。
Two wells,the well Long-XX and the well Ning-XX,in Longdong area are recently tested,and the target zone located in the bauxite formation has been found an important alternative resource for the Changqing Oilfield.Significant findings were obtained in exploring the bauxite formation through these two wells.Technical difficulties,such as prevailing of dissolution pores and fractures,borehole wall collapse,mud losses and poor hole cleaning etc.have been encountered in drilling the target bauxite formation.The main factors contributing to borehole wall collapse were found in analyzing and testing the bauxite samples for physical properties,chemical properties,mechanical properties and sensitivity characteristics,and a fast-plugging,inhibitive drilling fluid for safe drilling of the bauxite formation was developed.This drilling fluid has high temperature(170℃)high pressure filter loss of less than 10 mL and percent secondary cuttings recovery of greater than 91%.After soaking the bauxite samples in the drilling fluid and fresh water respectively for 15 days,the compressive strength of the samples tested in the drilling fluid is 81.8%higher than that of the samples tested in the fresh water.This drilling fluid has been tried in drilling the first horizontal Long-4XX well targeted the bauxite reservoir in Changqing,a horizontal section of 700 m was successfully drilled.The daily flowing production rate of this well is 3.53×10^(6)m^(3),a new record made in developing the upper Paleozoic resources in the Erdos basin in the last 50 more years.This technology has provided a technical support to the development of the similar reservoirs.
作者
贾俊
陈磊
郝超
周文军
冯永兵
JIA Jun;CHEN Lei;HAO Chao;ZHOU Wenjun;FENG Yongbing(Research Institute of Drilling and Production Engineering,Chuanqing Drilling Engineering Co.,Ltd.,Xi'an,Shaanxi 710018;Natural Gas Evaluation Project Department,Changqing Oil Field Branch,Petrochina,Xi'an,Shaanxi 710018;National Engineering Laboratory for Exploration and Development of Low Permeability Oil and Gas Fields,Xi'an,Shaanxi 710018)
出处
《钻井液与完井液》
CAS
北大核心
2024年第4期473-480,共8页
Drilling Fluid & Completion Fluid
基金
中国石油集团公司川庆钻探工程有限公司科技攻关项目课题“陇东铝土岩气藏水平井钻完井技术研究”(CQ2022B-17-2-3)。
关键词
铝土岩
水平井
快封堵
防塌
钻井液
Bauxite
Horizontal well
Fast plugging
Anti-collapse
Drilling fluid
