福建煤田深孔钻探施工技术探讨

Discussing of Deep Hole Drilling Construction in Fujian Coalfield

摘要:

福建煤田地质构造复杂，断层发育，岩层极其破碎且较松软，泥岩受挤压破碎为薄片状或烂泥状，给钻探施工造成许多困难，比如泥页岩水化膨胀，孔壁失稳导致孔内坍塌严重等。采用绳索取心技术，优选金刚石钻头，科学确定泥浆配比和钻进参数，成功解决了这些孔内技术难题，提高了钻探效率，降低了生产成本，取得的施工经验可供该矿区或该类地层的钻探施工借鉴。

Abstract:

The geological structure is complex in Fujian coalfield with fault development, fractured and loose rock formations and thin sheet or muddy mudstone by being extrusion, which cause many difficulties for drilling; such as mud shale hydration expansion and severe hole collapse led by hole wall instability, etc. By the use of wire-line core drilling technology, optimum the diamond bit and scientific ratio of mud and drilling parameters, the technical difficulties in holes were successfully solved. The drilling efficiency is improved and the production cost is reduced.