Key Technologies for Improving Drilling and Completion Speed in Shunbei Ultra-Deep and Ultra-High-Temperature Oil and Gas Field
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摘要:
顺北超深超高温断控型油气藏地质条件复杂、埋藏深，地层温度高、强度高，钻完井过程中漏失、坍塌、气侵、井斜和仪器工具失效等井下故障与复杂情况频发，严重制约了该油气藏的高效勘探开发。为此，针对古生界钻速慢的问题，研究了地层可钻性，优选高效钻头和大扭矩长寿命螺杆，推广应用预弯曲防斜打快技术；针对储层温度高、定向难度大的问题，推广应用高温随钻工具，配套井眼轨道设计和井眼控制技术；针对窄间隙漏失问题，采用“随钻封堵+段塞堵漏”和高性能水基钻井液；针对漏溢同层问题，应用控压钻井和平推法压井技术；针对长裸眼固井质量差的问题，采用超高温固井水泥浆体系和配套工艺。综合上述技术，研究形成了顺北超深超高温油气藏钻完井提速关键技术。该技术在顺北不同条带6口井进行了应用，基本解决了超深超高温油气藏钻井提速困难、漏溢同存等问题，钻井周期同比缩短了55.0%，机械钻速提高了184.2%。研究结果为顺北超深超高温断控型油气藏高效勘探开发提供了技术支持。
Abstract:The Shunbei ultra-deep and ultra-high-temperature fault-controlled oil and gas reservoir complex geology, large burial depth, high formation temperature, and high formation strength. During the drilling and completion process, complex situations such as leakage, collapse, gas invasion, wellbore deviation, and instrument tool failure are encountered frequently, seriously restricting the efficient exploration and development of the oil and gas field. Therefore, in order to improve the drilling speed in the Paleozoic, the drillability of the formation was investigated, and high-efficiency drill bits and long-life screws with large torque were selected, meanwhile pre-bending anti-deviation and fast drilling technology were promoted and employed. To address the issues of high reservoir temperature and difficulty in orientation, the application of high-temperature drilling tools was promoted, along with trajectory design and control technology. To avoid narrow gap leakage, “plugging while drilling + slug loss circulation control” and high-performance water-based drilling fluid were adopted. To address the issue of leakage and overflow in the same layer, managed pressure drilling and bull head method were applied to kill the well. In view of poor quality in long open hole cementing, an ultra-high-temperature cementing slurry system and supporting technology were adopted, and key technologies for improving drilling and completion speed in Shunbei ultra-deep and ultra-high-temperature oil and gas oilfield came into being. The technologies were applied in six wells in different zones of Shunbei, basically solving the problems of difficult drilling speed improvement and simultaneous leakage and overflow in ultra-deep and ultra-high-temperature oil and gas reservoirs. The drilling duration was shortened by 55.0% year on year, and the rate of penetration (ROP) was increased by 184.2%. The research results provided technical support for efficient exploration and development of Shunbei ultra-deep and ultra-high-temperature fault-controlled oil and gas reservoirs.
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表 1 顺北油气田预弯曲防斜打快工艺应用效果
Table 1 Application effect of pre-bending anti-deviation and fast drilling technology in Shunbei Oil and Gas Field
井号 井眼直径/
mm却尔却克组井段/
m钻压/
kN机械钻速/
（m·h−1）XB803X 241.3 5 819～7 660 100～130 7.60 XB81X 241.3 5 550～7 476 100～140 7.58 XB82X 241.3 5 710～7 618 80～140 6.65 XB83X 241.3 6 176～7 821 120～140 8.53 XB84X 241.3 6 226～7 846 80～130 8.23 XB8-2H 241.3 6 508～7 710 80～140 7.01 
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