克拉苏构造带博孜1区块复杂超深井钻井完井关键技术

Key Technologies for Drilling and Completing Ultra-deep Wells in the Bozi 1 Block of Kelasu Structure

殷召海 李国强 王海 丁永亮 王雲 刘长柱

YIN Zhaohai LI Guoqiang WANG Hai DING Yongliang WANG Yun LIU Changzhu

中国石油集团渤海钻探工程有限公司定向井分公司，天津 300450 中国石油集团渤海钻探工程有限公司国际工程分公司，天津 300450

Directional Well Technology Services Company, CNPC Bohai Drilling Engineering Company Limited, Tianjin, 300450, China International Engineering Company, CNPC Bohai Drilling Engineering Company Limited, Tianjin, 300450, China

克拉苏构造带博孜1区块复杂超深井钻井完井存在上部巨厚砾岩层钻速低、钻井周期长、固井质量差、钻井安全风险高等技术难点。为解决这些技术难点，结合区域地质特征，通过理论分析优化了井身结构，优选了系列钻井提速技术、提出了组合式盐底卡层技术，制定了一系列防漏堵漏技术措施和固井技术措施，形成了克拉苏构造博孜1区块超深井钻井完井关键技术。该技术在B1103井等4口井进行了现场试验，与未应用该技术的邻井相比，机械钻速提高了34.4%，钻井周期缩短了131 d，完井周期缩短了141 d，取得了良好的提速效果。这表明，该技术能够解决博孜1区块超深井钻井完井存在的技术难点，满足博孜1区块安全高效钻井完井的需求，可以在该区块推广应用。

Technical difficulties such as low ROP, long drilling cycle, poor cementing quality, and high drilling safety risk occur when drilling the upper part of complex ultra-deep wells in the Bozi 1 Block of the Kelasu structure. To break down these problems, a casing program was optimized in terms of regional geological characteristics and theoretical analysis; a series of technologies in ROP enhencment were optimized; combined evaporite bed determine technology was proposed, and a series of antileaking and lost circulation control technical measures and cementing measures were formulated. Consequently, key technologies for drilling and completion of complex ultra-deep wells in Bozi 1 Block of Kelasu structure were formed. The technologies had been tested in four wells including B1103 with an excellent potential for universal applicability. Compared with the neighboring wells using other drilling and completion technologies, there were many positive advances. For example, the ROP was increased by 34.4%, drilling cycle was reduced by 131 days, and completion cycle was cut by 141 days. This showed that the technologies could solve the technical difficulties in drilling and completion of ultra-deep wells reservoirs in the Bozi 1 Block, ensuring safe and efficient drilling and completion. Hence, the key technologies could be widely adopted in this block.

中国石油集团公司重大科技专项 “重大工程关键技术装备研究与应用”（编号：2018E-21）资助

https://doi.org/10.11911/syztjs.2020130