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首页> 外文会议>Geothermal Resources Council Annual Meeting >Germany's Deepest Hydro-Geothermal Doublet, Drilling Challenges and Conclusions for the Design of Future Wells
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Germany's Deepest Hydro-Geothermal Doublet, Drilling Challenges and Conclusions for the Design of Future Wells

机译：德国最深处的水力热水双倍，钻探未来井设计的挑战和结论

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From 2016 to 2017 two hydro-geothermal wells were successfully drilled in Holzkirchen, a market town south of Munich, Germany. The carbonate reservoir in this region (the Jurassic "Malm") is found between 4,600 m and 5,200 m depth and is known to have suitable transmissivity and a geothermal fluid with low salinity. The first well was spudded in January 2016; the drilling for the first two sections went according to plan. Following an intense gas kick, the third section had to be abandoned and a sidetrack was drilled following a new well path to avoid the potential gas-bearing zone. The final depth of 5.600 m MD was reached in May. After successfully testing the first well, the second well commenced in June. In the third section, part of a liner as well as a drilling BHA were lost in two separate incidences due to differential sticking. Two sidetracks were drilled and after a total drilling period of about 8 months, the final depth of 6.084m MD was reached and followed by a well test which verified the required productivity and temperature. The most significant drilling challenge was the high variance in pore pressures and the difficulty in foreseeing these pressures within the lower part of the basin sediments (Oligocene and Upper Cretaceous) (approx. 3000 - 4500 m TVD), despite data from hydrocarbon offset wells. The primary conclusion for future wells to be drilled further south of Munich is to incorporate an additional sixth casing string, which would allow the use of higher mud weights in potential overpressure zones to achieve a sufficient kick tolerance whilst not increasing the risk of differential sticking in formations with normal pore pressure. Therefore, this paper will discuss two different design options for future wells. Option 1: Standard clearances are used resulting in an increased surface casing diameter and Option 2: No change in surface casing diameter but the incorporation of a low clearance section. The final borehole diameter in both design options stays the same.
机译：从2016到2017年，两台水力地热井，在德国慕尼黑南部的市场城镇Holzkirchen成功钻探。该区域中的碳酸盐储存器（侏罗纪“麦芽”）被发现在4,600米和5,200米之间，并且已知具有合适的透射率和具有低盐度的地热流体。第一个很好的是2016年1月的傻瓜;前两部分的钻孔根据计划进行。在激烈的气体踢之后，必须放弃第三部分，并且在新的井道之后钻出侧面，以避免潜在的含气区。 5月份达到了5.600米MD的最终深度。在成功测试第一井后，第二次良好的良好开始于6月开始。在第三部分，由于差动粘性，衬里的一部分以及钻孔BHA丢失了两种独立的发生率。钻出两种侧面侧面钻孔，经过大约8个月的总钻孔，达到6.084米MD的最终深度，然后进行井测试，验证所需的生产率和温度。尽管来自碳氢化合物偏移井的数据，但最重要的钻孔挑战是孔隙压力的高差异，以及难以预见盆地沉积物（寡烯和上层白垩纪）（约3000 - 4500米TVD）的压力。慕尼黑以南进一步钻井的未来井的主要结论是融入另外的第六个套管柱，这将允许在潜在的过压区内使用较高的泥浆重量，以实现足够的踢足耐受性，同时不会增加差异粘连的风险孔隙压力正常的形成。因此，本文将讨论未来井两种不同的设计选项。选项1：使用标准间隙，导致表面套管直径增加和选项2：表面壳体直径没有变化，但掺入低间隙部分。两个设计选项中的最终钻孔直径保持不变。

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