Research on key technologies for developing multi-branched horizontal of CBM wells in low pressure and low permeability coal reservoirs
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摘要: 西藏昌都孜拉山隧道勘察水平孔设计深度1500 m,实际完钻深度1888.88 m。钻进过程中强风化破碎带地层孔壁易坍塌,硬岩地层超长水平孔钻孔轨迹控制难度大,绳索取心岩心管和打捞器推送困难,提下钻阻力大、回转扭矩大、钻具磨损严重,局部地层涌水、冲洗液漏失频发,严重影响成孔质量、施工效率和施工成本。分析了无垂深水平孔钻进过程中破碎地层孔壁失稳、钻孔轨迹偏移、钻进扭矩大、钻具磨损严重等问题产生的原因,给出了实钻过程中的解决方案和处理措施,顺利完成钻孔施工任务,积累了无垂深水平孔绳索取心钻进复杂问题处理措施和经验。Abstract: The design depth of the horizontal exploration hole for the Zila Mountain Tunnel in Changdu, Tibet is 1500m with the actual completion depth of 1888.88m. During the drilling process, many difficulties and downhole incidents were encountered, including collapsible hole wall in the strongly weathered and fractured zone, difficult control of the trajectory of the ultra-long horizontal hole drilling in hard rock formations, difficult landing of the wireline core tube and the overshot, high tripping resistance, high rotation torque, severe wear and tear of the drilling tool, local formation water inrush, frequent circulation loss. They had seriously affected the drilling quality, efficiency, and cost. This paper analyzes the causes for the above mentioned problems in drilling the horizontal hole with zero TVD (true vertical depth) tolerance, and presents the solutions and treatment measures taken in the actual drilling process for successful completion of the drilling job, which has accumulated treatment measures and experience for dealing with the complex problems in wire-line coring drilling of horizontal holes with zero TVD tolerance.
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