纪照生,袁国栋,晁文学,等. 塔里木盆地超深小井眼定向钻井提速提效关键技术[J]. 石油钻探技术,2024,52(4):8-14. DOI: 10.11911/syztjs.2024064
引用本文: 纪照生,袁国栋,晁文学,等. 塔里木盆地超深小井眼定向钻井提速提效关键技术[J]. 石油钻探技术,2024,52(4):8-14. DOI: 10.11911/syztjs.2024064
JI Zhaosheng, YUAN Guodong, CHAO Wenxue, et al. Key technology for speeding up and improving efficiency of ultra-deep slim-hole directional drilling in Tarim Basin [J]. Petroleum Drilling Techniques, 2024, 52(4):8-14. DOI: 10.11911/syztjs.2024064
Citation: JI Zhaosheng, YUAN Guodong, CHAO Wenxue, et al. Key technology for speeding up and improving efficiency of ultra-deep slim-hole directional drilling in Tarim Basin [J]. Petroleum Drilling Techniques, 2024, 52(4):8-14. DOI: 10.11911/syztjs.2024064

塔里木盆地超深小井眼定向钻井提速提效关键技术

Key Technology for Speeding up and Improving Efficiency of Ultra-Deep Slim-Hole Directional Drilling in Tarim Basin

  • 摘要: 针对塔里木盆地台盆区超深小井眼定向钻井机械钻速低、钻头使用寿命短、常规螺杆钻具脱胶脱扣、钻井液稳定性差和产层喷漏同存等难题,研究形成了塔里木盆地超深小井眼定向钻井提速提效关键技术。以标准行程钻速和钻头进尺为指标,采用统计分析法优选了适用于目的层的ϕ149.2 mm/ϕ165.1 mm KS1352DGRX型钻头和ϕ120.7 mm KDM1062TR型钻头;对比国内外抗高温螺杆现状,确定了井底温度低于180 ℃时推荐使用国产抗高温螺杆,高于180 ℃时推荐使用全金属螺杆或进口耐高温螺杆;采用理论分析结合数值模拟的方法,优化设计了小尺寸降摩减阻工具,并优化了其安放位置;优选抗盐高温高压降滤失剂和抑制剂,研选除氧剂等,制定合理pH值调控和钙离子补充措施,形成了抗温200 ℃钻井液;分析了顺北油气田产层钻进喷漏同层的特点,确定了“降密度+井口控压+优化排量”的井控基本原则。塔里木盆地5口井应用了超深小井眼定向钻井提速提效关键技术,小井眼段平均机械钻速提高了113.24%,平均井径扩大率5.57%,平均钻井周期缩短了35.03%,均未发生井下故障和复杂情况。超深小井眼定向钻井提速提效技术为塔里木盆地勘探开发提供了技术支撑。

     

    Abstract: In view of the problems such as low rate of penetration (ROP), short bit life, degumming and threading off of conventional screw drill tool, poor stability of drilling fluid, and simultaneous occurrence of blowout and leakage in pay zones in ultra-deep slim-hole directional drilling in the platform basin area of the Tarim Basin, the key technology for speeding up and improving efficiency in ultra-deep slim-hole directional drilling in Tarim Basin was developed. The technology used the standard drilling rate of a trip and bit footage as indicators and employed statistical analysis method to select bit KS1352DGRX with a diameter of ϕ149.2 mm / ϕ165.1 mm and bit KDM1062TR with a diameter of ϕ120.7 mm applicable to the target layer. By comparing the current situation of high-temperature resistant screws in China and abroad, Chinese high-temperature resistant screws were recommended for bottomhole temperatures below 180 °C. Otherwise, it was recommended to use metal screws or imported high-temperature resistant screws. The small-sized friction and drag reduction tools were designed using theoretical analysis combined with numerical simulation methods, and the tools’ position was optimized. Optimal salt-resistant, high-temperature, and high-pressure filtrate reducers and inhibitors were selected, and deoxidizers were developed. Reasonable pH control and calcium ion supplementation measures were made, and a temperature-resistant drilling fluid system for 200 °C was formed. The characteristics of blowout and leakage in the same layer in the pay zones of Shunbei Oilfield were analyzed, and the basic principle of well control featuring “density reduction + wellhead pressure control + optimized displacement” was determined. The key technology for speeding up and improving efficiency in ultra-deep slim-hole directional drilling in Tarim Basin was applied in five wells. The average ROP of the slim-hole section was increased by 113.24%, and the average hole diameter expansion rate was 5.57%. The average drilling cycle was shortened by 35.03%, and none of the wells had bottom hole failures and other complex conditions. The key technology for speeding up and improving efficiency in ultra-deep slim-hole directional drilling have provided the technical supports for the exploration and development of Tarim Basin.

     

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