川南煤田古叙矿区大村勘查区复杂地层钻探施工技术

Construction Technology in Complex Formation of Dacun Exploration Area in Guxu Mining Area of South Sichuan Coal Field

摘要:

川南煤田古叙矿区大村勘查区溶洞、溶隙发育，煤层垮塌，加之瓦斯压力测试、煤层气试井对孔壁的破坏，施工难度大。为了解决上述钻探施工难题，从钻孔结构设计、钻头选型、钻井液使用、套管使用等方面入手，采取相适应的施工工艺及技术措施，取得了较好的效果，保证了该地区钻探施工的顺利实施。

Abstract:

The construction is difficult in Dacun exploration area in Guxu mining area of South Sichuan coal field with Karst cave and crack development, coal seam collapse and the wall damage by gas pressure test and CBM well test. In order to deal with the above difficulties, the suitable construction processes and technical measures were adopted in borehole structure design, bit selection and the usage of drilling fluid and casing, the good effects ensured the smooth drilling construction in this area.