沁水盆地深部煤层气水平井定向钻进地质导向技术
Geological steering technology for directional drilling of deep CBM horizontal wells in Qinshui Basin
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摘要: 沁水盆地内深部煤层地质构造较为复杂，对水平井定向着陆点控制及水平段钻进轨迹控制构成新的挑战，传统基于导眼钻进探查所得的目标层及紧邻相关层位地质特征数据及岩性判别等方法，难以满足实际定向钻进过程中精准轨迹控制，无法实现顺层钻进的要求。为了解决深井水平定向钻进控制问题，提出了一套适用于适用于深部煤层气水平定向钻进地质导向技术，通过前期谐振解析分析判断目的煤层地质构造情况，设计施工导眼获取目标地层参数，采用精准着陆技术和水平段地质导向技术完成钻井工作。该技术在沁水盆地武乡南区块WXN-T27-L1井试验应用，钻进水平段长708.00 m，煤层钻遇率达85.51%，显著提高煤层钻遇率、缩短钻井周期。Abstract: The geological structure of the deep coal seam in Qinshui Basin is relatively complex, which poses a new challenge to the control of the directional landing site of the horizontal well and the control of the drilling trajectory of the horizontal section, and the traditional methods based on the geological characteristics data and lithology of the target layer obtained by the guide hole drilling exploration are difficult to meet the precise trajectory control in the actual directional drilling process, and the requirements of drilling along the layer cannot be realized. In order to solve the problem of horizontal directional drilling control of deep wells, a set of geological guidance technology suitable for horizontal directional drilling of deep coalbed methane was proposed. The geological structure of the target coal seam was judged by early resonance analysis, the target formation parameters were obtained by the design and construction guide hole, and the drilling work was completed by using precise landing technology and horizontal section geological guidance technology. The technology was tested and applied in WXN-T27-L1 well in south Wuxiang block of Qinshui Basin, with a drilling horizontal section length of 708.00 m and a coal seam drilling rate of 85.51%, which significantly improved the coal seam drilling rate and shortened the drilling cycle.
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