大牛地气田直井复合式钻进的可行性分析

Feasibility analysis of combination drilling of vertical wells in Daniudi gas field

目前大牛地气田使用传统PDC钻头+大钻压的钻进方式,严重制约了优快钻井的发展。分析大牛地气田钻井现状,并借鉴同属鄂尔多斯盆地的长庆气田的成功经验,对螺杆+PDC钻头复合钻进模式在大牛地气田的实用性进行研究。结果表明,复合钻进模式在大牛地气田有广阔的应用前景,复合钻进模式不仅能够达到充分发挥PDC钻头低钻压、高转速效能的目的,而且具有节约成本、提高钻速、防斜纠斜、防止钻具失效等优势。

The use of conventional PDC drill bit + heavy WOB has seriously restricted the development of Daniudi gas field.Based on current drilling status analysis and the successful experience of Changqing gas field located in the same Ordos Basin,the feasibility of combination of screw + PDC drill bit has been studied for drilling in Daniudi gas field.The results indicate a promising future of combination drilling for this gas field.It not only gives a full play to PDC drill bit to keep low WOB and high rotation rate,but also saves cost,improves drilling speed,prevents and controls deflection,and prevents drilling rig failure.