摘要
四川盆地中部地区高石梯—磨溪构造侏罗系自流井组—三叠系须家河组渗透性强,钻井过程中虚厚泥饼形成快,起下钻作业存在阻卡频繁发生、划眼井段长、处理复杂情况时间长等技术难题。为此,基于对多口井阻卡发生原因、处理过程的分析,从微扩眼工具设计、钻井参数优化、钻井液性能优化、防卡技术等方面开展技术攻关,形成了新型随钻扩眼防卡钻具技术。研究结果表明:(1)创新扶正器偏心结构设计,自主研制随钻偏心微扩眼器,可在阻卡风险井段有效扩大井径;(2)创新配套弯螺杆,优选钻具组合,优化钻井参数,强化安全措施,有利于降低卡钻风险;(3)强化钻井液性能,有效控制失水,有利于缓解高渗透性地层钻井段虚厚泥饼的快速形成。通过上述研究,建立了“弯螺杆(带扶正器)+扶正器+偏心微扩眼器”新型随钻扩眼防卡式钻具的技术组合。在川中地区高石梯—磨溪构造3口井的钻井中,现场试验应用结果表明:该项技术在起下钻作业中的扩径减阻(扩大井径、减少阻卡风险)效果显著,单井平均阻卡损失时间降低93%。新型随钻扩眼防卡钻具技术的成功应用,对容易发生起下钻阻卡的井段实现优快钻井有技术参考意义。
In Gaoshiti-Moxi structure,central Sichuan Basin,most strata from the Jurassic Ziliujing Formation to the Triassic Xujiahe Formation are strongly permeable.And drilling practice demonstrates that rapid formation of mud cake with false thickness certainly creates difficulties,for example frequent pipe sticking,long reaming segment,and time-consuming complexity treatment.So,both causes and countermeasures were analyzed for the sticking in several wells.Then,through innovations on the design of micro-reaming tool,optimization of drilling parameters and drilling-fluid performance,and development of anti-sticking technology,some novel an-ti-sticking reaming while drilling(RWD)tools were set up.Results show that(i)with a creative eccentric-type stabilizer,an eccentric micro reamer while drilling is independently developed,which may expand caliper in sticking segments with effect;(ii)to innovate the matched bending screw,to optimize bottomhole assembly(BHA)and drilling parameters,and to intensify safety measures are condu-cive to minimizing risks in sticking;and(iii)to enhance fluid performance and to control water loss are profit for alleviating the rapid formation of mud cake with false thickness in the highly permeable strata.In addition,consisting of bending screw equipped with the stabilizer+stabilizer+eccentric micro reamer,the anti-sticking RWD tools are created and applied to three wells in this structure.Ob-vious consequence has been achieved in caliper expansion or sticking prevention,resulting in the average time in anti-sticking reaming decreased by 93%per well.And the success application is referential for fast drilling in sticking segments.
作者
冯劲
FENG Jin(Chuandong Drilling Company,CNPC Chuanqing Drilling Engineering Company Limited,Chongqing 401147,Chi-na)
出处
《天然气勘探与开发》
2024年第4期119-125,共7页
Natural Gas Exploration and Development
基金
中国石油集团公司科研项目(编号:2020B-4019)。
关键词
高石梯—磨溪构造
侏罗系
高渗透
阻卡
复杂防控
Gaoshiti-Moxi structure
Jurassic
High permeability
Pipe sticking
Complexity control
