顺北Ⅳ号条带超深高温定向井钻井关键技术

顺北油田IV号条带地质构造属滑移断裂带，以奥陶系碳酸盐岩储层为主，多采用水平井/定向井方式开发，平均垂深接近8 000 m，井底温度最高达174 ℃，超深、高温、复杂地质条件给该区域定向钻井带来了井眼轨迹控制难、仪器故障率高、气侵处理时效低等技术难题。为解决上述技术难题，进一步优化了井身剖面，降低了定向难度，复合钻进比例平均提高10%；通过优配钻具组合、优选钻进参数、应用工具面稳定调控工艺和地震数据随钻指导钻井技术，井眼轨迹控制效率大幅度提高，中靶率100%；在井筒温度场分布规律研究基础上，配套了高温随钻测量工艺，仪器故障率由23%降至9.3%；利用简易控压钻井技术提高了储层气侵处理效率。该技术现场应用12口井，储层定向周期较设计平均缩短14.3%，平均机械钻速较邻区提高32.1%，可进一步推广应用。

Key technology of directional drilling in the ultra-deep high-temperature IV belt,the Shunbei oilfield

The IV belt of the Shunbei oilfield is located in a slipping fault zone. Its reservoirs mostly of the Ordovician carbonate rocks are mainly recovered using horizontal/direction wells. The average vertical depth is nearly 8 000 m, with a maximum formation temperature of 174 °C, The ultra-high depth, high temperature and complex geology lead to technical challenges for directional drilling in this area, such as high difficulties in well trajectory control, high failure rates of devices and low timeliness to handle gas invasion. Under this background, the casing program was optimized to reduce difficulties in directional drilling, and the proportion of composite drilling was on average increased by 10%. The efficiency of well trajectory control was greatly improved, with a target hit rate of 100%, by optimizing the BHA and drilling parameters and applying the tool-face stable adjustment and control technology and seismic-assisted guiding-while-drilling technology. Based on the investigation of the well temperature field distribution, the MWD technology was improved, and the tool failure rate dropped from 23% to 9.3%. With the simplified MPD technology, the handling efficiency for the gas invasion was enhanced. The presented directional drilling technology was applied to 12 wells in the field. Compared with the drilling engineering design, the directional drilling duration of the reservoir is on average reduced by 14.3%, and the average rate of penetration is increased by 32.1%, compared with that of the adjacent block. Applications of the presented directional drilling technology should be further promoted.