摘要
诺1井位于柴达木盆地北缘东部三湖坳陷霍布逊凹陷全吉背斜圈闭,完钻井深为5 000 m,是工程公司重点预探井。该井地层泥岩水敏性强,砂泥岩互层严重,区域断层发育,存在盐水等流体污染,下部地层无实钻资料可供参考,施工中钻井液技术难度大。通过优选胺基硅醇强抑制强封堵钻井液体系,配合相应的现场钻井液维护处理工艺,有效抑制了砂泥岩互层中泥页岩的水化膨胀,井壁稳定性得到有效提高,成功完成了诺1井的工程施工。诺1井中途完钻及完井后采用封井浆封井,保障了中完及完井作业的顺利进行,全井共计电测10次,成功率100%,下套管一次到底;全井井身质量良好,虽然发生卡钻事故,但是φ444.5 mm、φ311.2 mm、φ215.9 mm井眼平均井径扩大率为7.46%、9.33%和9.40%;全井平均机械钻速为7.54 m/h,达到了优快钻井的目的,为区块后续勘探开发提供了技术保障。
Well Nuo-1, 5 000 m in depth, is a key exploratory well located in the east of the northern margin（Quanji anticline, Huobuxun sag, Sanhu depression） of the Qaidam Basin. Formations penetrated by the well included strongly water-sensitive mudstones and frequent interbeds of sandstones and mudstones. Faults are developed in the area and formation saltwater renders contamination to the drilling fluids used. Difficulties in drilling fluid operation existed because of the problems and no offset well data were available for reference. An amine-based silanol highly inhibitive plugging drilling fluid was selected to inhibit the hydration and swelling of shale, and techniques for drilling fluid maintenance were optimized to inhibit the hydration and swelling of mudstone and shale formations, thereby to stabilize the borehole wall. The drilling of Well Nuo-1 was successful, providing a technical support for subsequent drilling operation in the same area. When drilled to the designed depth of each interval and the completion depth of the well, viscous mud was spotted at the bottom of the well to guarantee the success of casing running and well cementing. 10 times of well logging were all conducted successfully and casing strings were run to the bottom with no hindrance. Average percent hole enlargement of theφ444.5 mm was 7.46%, the φ311.2 mm was 9.33%, and the φ215.9 mm was 9.40%. Although pipe sticking had occurred drilling, these data indicate that the quality of the whole well is satisfactory, especially when the exploratory well was first drilled in an area that had never been explored. Average ROP of the well was 7.54 m/h, realizing the objective of ＂high quality fast drilling＂.
出处
《钻井液与完井液》
CAS
北大核心
2017年第6期46-51,共6页
Drilling Fluid & Completion Fluid
关键词
井壁稳定
砂泥互层
胺基硅醇
强抑制钻井液
强封堵钻井液
诺1井
Borehole stability
Interbedded sandstone and mudstone
Amine-based silanol
Strongly inhibitive drilling fluid
Plugging drilling fluid
Well Nuo-1
