青海果洛龙洼金矿复杂地层钻井液与钻进方法研究

Study on drilling fluid and drilling technology in the complicated strata in the Guoluolongwa gold deposit, Qinghai

中文关键词: 低固相  低失水抑制型  防塌型  大动塑比  青海

英文关键词: low solid phase  anti-sloughing mud  loose and crushing collapse  rock stratum application value  Qinghai Province

中文摘要:

      青海省都兰县沟里乡果洛龙洼金矿构造活动多期叠加,地层破碎复杂,矿体赋存于构造蚀变带中,围岩及矿体顶底板岩石破碎松散,钻进过程中孔壁稳定性差,水敏缩径、松散易塌、掉块等现象并存,卡钻、埋钻事故经常发生。结合钻具组合与钻孔结构的设计,根据地层特点选取合适钻进方法,并依据冲洗液上返的环空间隙、循环阻力及悬浮排屑需求,选取了抑制型和防塌型的低固相泥浆,通过室内预案和现场试验对比,分别选择对应的低固相冲洗液,解决了复杂地层的松散坍塌和水敏缩径问题,使深部地质找矿钻探工作得以顺利进行。

英文摘要:

      The Guoluolongwa gold deposit, located at Gouli township,Dulan county, Qinghai Province, experienced multi-stages of structural activities, and the gold orebodies exist occur in the altered fracture zone. The country rock, hanging wall and footwall of the gold orebody are very loose and broken, therefore the drillhole wall is instable and easy to collapse during the drilling process, and the sticking buried drilling accidents are added frequently. By analyzing BHA and drillhole structures, the appropriate drilling technology, formulated hedge lotion and low solid anti-sloughing mud were selected. Through experimental test, it was found that the use of the low solid anti-sloughing mud solved the problems of drillhole collapse and drillhole shrinkage successfully, and the deep exploration drilling in the complicated strata went smoothly.