YD油田Y26ST井控制压力钻井技术  

Managed Pressure Drilling Technique in the Well Y26ST of YD Oilfield

作　　者：张华卫[1] 郭京华[2] 庞小旺 赵向阳[1] 赵国权 

机构地区：[1]中国石化石油工程技术研究院,北京100101 [2]中国石化国际石油勘探开发有限公司,北京100029 [3]中国石油川庆钻探工程有限公司,四川成都610051

出　　处：《石油钻探技术》2015年第3期35-40,共6页Petroleum Drilling Techniques

基　　金：国家科技重大专项之专题"中东复杂地层安全快速钻井关键技术研究"(编号:2011ZX05031-004-001)资助

摘　　要：YD油田Y26井在钻进Kazhdumi组地层时有大量沥青和硫化氢侵入,造成井涌与井漏并存的井下复杂情况,采取多种方法处理未见效果,被迫临时弃井。Y26ST井为Y26井的侧钻井眼,基于原井眼沥青侵处理过程中获得的经验与教训,针对侧钻要求,开展了控制压力钻井技术适应性评价和控制压力钻井风险分析,并形成了Y26ST井控制压力钻井技术方案。侧钻过程中,根据实际情况,依次采用了井底恒压和加压泥浆帽2种控制压力钻井方法,有效控制了井筒内的压力分布,降低了沥青侵、油气侵和井漏等井下复杂情况对钻井工程的危害。Y26ST井顺利钻穿Kazhdumi组湿沥青层段,成功下入尾管并固井。控制压力钻井技术在Y26ST井的成功应用,为活跃沥青层长裸眼安全钻进提供了新的技术手段。Large volume of bitumen and hydrogen sulfide flew into Well Y26 in the YD Oilfield while drilling into the Kazhdumi Formation,which resulted in the complexity of coexisting well kicks and lost circulation.Some methods were used to kill the well,but they were all unsatisfactory.Finally,the well was temporarily abandoned.Well Y26 ST is a sidetracked hole of Well Y26.On the basis of experience gained from handling the bitumen in the original borehole,assessments for applicability and risks related to managed pressure drilling were conducted,so as to generate a drilling program for Well Y26 ST.To cope with the kick of formation fluids during drilling,the methods both constant bottom hole pressure and pressured mud cap were used during sidetracking operation,the borehole pressures was controlled effectively,the invasion of wet bitumen,heavy oil and gas was minimized,lost circulation and other troubles in drilling were also avoided.Well Y26 ST was penetrated the wet bitumen interval and cemented with liner successfully in Kazhdumi Formation,which shows that success of managed pressure drilling in Well Y26 ST can provide a reference for drilling a long open-hole interval within active bitumen formation.

关 键 词：控制压力钻井 泥浆帽 井底压力 Y26ST井 YD油田 

分 类 号：TE242[石油与天然气工程—油气井工程] TE283