Key Drilling Technologies for Ultra-Shallow Horizontal Wells in the Jihua-1 Block of Jilantai Oilfield
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摘要: 吉兰泰油田吉华1区块在钻超浅层水平井时，由于上部白垩系地层松软，下部片麻岩地层硬度高、可钻性差、非均质性强，存在造斜率难以保证、钻井周期长、硬地层水平段延伸困难和后期固井套管下入困难等问题。针对该情况，开展了超浅层水平井钻井技术研究。结合该区块的地质特性，应用片麻岩岩石力学参数进行模拟计算，优化了井身结构，进行了PDC个性化钻头设计，优化了钻具组合及提速工具，并集成环保性好、储层保护效果好的低固相钻井液和漂浮下套管等配套技术，形成了吉兰泰油田吉华1区块超浅层水平井钻井关键技术。现场应用4口井，均未发生任何井下复杂情况，成井效果良好，为该区块后续的水平井开发提供了技术支撑。Abstract: During the drilling of ultra-shallow horizontal wells in the Jihua-1 Block of Jilantai Oilfield, some problems were encountered due to the soft Cretaceous strata in the upper part and the high hardness, poor drillability and strong heterogeneity of the gneiss strata in the lower part. In these wells, the build up rate can not be guaranteed, the drilling cycle is long, the horizontal sections are difficult to extend in hard strata, and the later completion casings are hard to run safely. In the light of this, the drilling technologies for ultra-shallow horizontal wells were studied. Considering the geological characteristics of this region, the rock mechanics parameters of gneiss were adopted in simulation and the casing program was optimized. A customized PDC bit was designed and the bottomhole assembly and speed-up tools were optimized. In addition, supporting technologies such as float casing running and environmentally friendly low-solid drilling fluid which would effectively protect the reservoir were integrated. Thus, key drilling technologies were formed for ultra-shallow horizontal wells in the Jihua-1 Block of Jilantai Oilfield. They were applied to four wells in the field with no downhole complexity occurred, suggesting good well completion results. These technologies can provide technical support for the future development of horizontal wells in this block.
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Keywords:
- gneiss /
- horizontal well /
- drilling /
- ultra-shallow layer /
- casing program /
- Jihua-1 Block /
- Jilantai Oilfield
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表 1 常规下套管模拟分析结果
Table 1 Simulation results of conventional casing running
套管外径/mm 摩阻系数 上提载荷/kN 静载荷/kN 下放载荷/kN 下放摩阻/kN 水平段长/m 管内 管外 139.7 0.25 0.40 284.7 137.8 31.4 106.4 800 0.25 0.45 300.6 17.3 120.4 
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表 2 漂浮下套管模拟分析结果
Table 2 Simulation results of float casing running
套管外径/mm 摩阻系数 上提载荷/kN 静载荷/kN 下放载荷/kN 下放摩阻/kN 水平段长/m 管内 管外 139.7 0.25 0.40 191.4 115.9 53.4 62.5 800 0.25 0.45 198.0 47.7 68.2
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表 3 4口超浅层水平井钻井完井参数
Table 3 Drilling and completion parameters of 4 ultra-shallow horizontal wells
井号 井深/m 垂深/m 最大井斜角/（°） 水平位移/m 水平段长/m 套管下放方式推荐 实际施工 吉华1平1井 1 422 636 78.00 1 080 817 顶驱下压 顶驱下压
（压力70～100 kN）吉华1平7井 1 326 641 72.38 1 040 783 顶驱下压 顶驱下压
（压力40～60 kN）吉华1平13井 1 493 663 78.13 1 132 843 顶驱下压 顶驱下压
（压力10 kN）吉华1平11井 1 922 634 85.82 1 591 1 204 “漂浮+顶驱”复合下套管 复合下套管至接箍位置
（井深797.67 m处）
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