Up-to-Date ROP Improvement Technologies for Drilling in the Paleozoic of Shunbei Oil & Gas Field and Suggestions for Further Improvements
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摘要:
顺北油气田储层埋深达8 000～8 800 m，穿越层位多，岩性复杂。尤其是钻进古生界时钻井速度慢、钻头寿命短，导致钻井周期长、成本高的问题突出，制约了该油田高效经济开发。为此，分析了影响古生界破岩效率难钻地层的特征及提速难点，总结了针对二叠系、石炭系—志留系和奥陶系桑塔木组的钻井提速技术，明确了各项技术的提速原理和技术特征，分析了各项技术在顺北油气田古生界的提速效果。在此基础上，进一步分析了目前提速技术依然存在的问题，指出各项技术提速效果差异性大、缺乏理论基础、钻井提速潜力不明确仍然是制约顺北油气田钻井提速技术发展的瓶颈问题，给出了古生界提速技术的发展建议，以期为该油气田古生界进一步提高破岩效率提供新的思路。
Abstract:The reservoirs in Shunbei Oil & Gas Field are characterized by a deep burial depth of 8000−8800 m. There are many strata to cross in the drilling process, and the lithology is very complex. A persistent issue, the slow drilling speed and short bit life of Paleozoic lead to the problems of long drilling cycle and high cost, which restrict its efficient and economic development. Therefore, the characteristics of the hard-to-drill formations that influence the rock-breaking efficiency in the Paleozoic and also the difficult parts of rate of penetration(ROP) improvement were analyzed. Subsequently, ROP improvement technologies designed for drilling in the Permian, Carboniferous-Silurian, and Sangtamu Formation were summarized. Meanwhile, the ROP improvement principles and characteristics of these technologies were clarified, and the performance of the technologies in improving the ROP in the Paleozoic of Shunbei Oil & Gas Field was analyzed. On this basis, the problems with currently available ROP improvement technologies were further investigated. This work points out that the technical bottleneck restricting the development of drilling acceleration technology in Shunbei Oil & Gas Field was due to a great difference in the effect of various ROP improvement technologies, the lack of theoretical basis and an unclear drilling acceleration potential. Finally, the suggestions for further improvements of ROP improvement technologies for the Paleozoic were proposed to provide a new approach to further enhancing the rock-breaking efficiency in the Paleozoic of Shunbei Oil & Gas Field.
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Keywords:
- Paleozoic /
- Permian /
- Carboniferous /
- Silurian /
- Santamu Formation /
- drilling /
- ROP /
- Shunbei Oil & Gas Field
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图 2 尖圆齿PDC钻头工作原理及布齿情况
Figure 2. Working principle and tooth distribution of polycrystalline diamond compact (PDC) bit with sharp circular teeth
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图 3 钟摆钻具组合防斜原理
Figure 3. Deviation control principle of the pendulum bottom-hole assembly(BHA)
表 1 奥陶系桑塔木组易斜地层提速效果对比
Table 1 Comparison of the ROP improvement effect in deviation-prone formations in the Ordovician Sangtamu Formation
井名 井眼直径/mm 提速工艺 进尺/m 钻速/（m·h−1） 顺托1井 241.3 PDC钻头+螺杆钻具 1470 1.91 顺北8X井 241.3 PDC钻头+螺杆钻具 1868 3.15 顺北14井 241.3 PDC钻头+垂直钻井工具 2210 9.11 顺北41X井 241.3 PDC钻头+垂直钻井工具 1249 6.29 顺北42X井 241.3 PDC钻头+垂直钻井工具 195 5.82 顺北16X井 215.9 PDC钻头+垂直钻井工具+螺杆钻具 2239 13.45 顺北801X井 215.9 PDC钻头+垂直钻井工具+螺杆钻具 1779 6.49 顺北4-1H井 215.9 PDC钻头+垂直钻井工具+螺杆钻具 1465 8.52 顺北44X井 215.9 PDC钻头+垂直钻井工具+螺杆钻具 332 5.03 
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