不分散低固相钻井液在车排子地区铀矿绳索取心钻进中的应用研究  

Application Research on Non-dispersible Low-solid Drilling Fluid in Wire-line Coring Drilling for Uranium Exploration in Chepaizi Area

作　　者：孟祥森 蔡顺山 董瑞 MENG Xiangsen;CAI Shunshan;DONG Rui(Geologic Party No.216,CNNC,Urumqi,Xinjiang 830011,China)

机构地区：[1]核工业二一六大队,新疆乌鲁木齐830011

出　　处：《铀矿地质》2023年第4期700-706,共7页Uranium Geology

摘　　要：准噶尔盆地车排子地区是近年来可地浸砂岩型铀矿找矿的主要地区。但是通过最近几年车排子勘探区的钻探施工情况来看,该区域内地层较为复杂,区内广泛分布有泥页岩、松散砂砾岩等强水敏、不稳定地层。在区内钻探施工中,易发生岩层水化膨胀、孔径缩小、孔壁坍塌等复杂情况。而钻井液的性能是实现复杂地层顺利钻进的关键指标,在车排子勘探区钻探施工中使用传统细分散钻井液面临着岩心采取率低、地质效果差、回次进尺短和钻探效率低等问题。文章针对车排子勘探区的地层特点和钻探施工中存在的问题,通过相关钻井液文献调研和现场实验,研究并优选出了一套新型低固相不分散钻井液体系、配置与维护技术。该钻井液以广谱护壁剂和磺化沥青粉为核心材料,具有配置维护简单、流动性好、失水量低和所形成泥饼薄而强韧的特点。在2022年的铀矿钻探中,采用该钻井液体系,结合电动直驱钻机在车排子勘探区开展了绳索取心钻进实验,3口试验钻孔达到安全、优质和高效完孔的试验目标,为今后该地区类似钻孔的钻探施工提供借鉴与指导意义。Chepaizi area of the Junggar Basin is the main prospecting target for leachable sandstone-uranium deposits in recent years.However,the drilling construction in the Chepaizi exploration area in recent years encountered some problem due to widely distributed water-sensitive and unstable strata such as mud shale and loose sandy conglomerate,which often cause the hydration expansion of the rock formation,shrinkage of the borehole diameter,and collapse of the borehole wall during the drilling construction.And the traditional finely dispersed drilling fluids fails to solve the problems encountered in actual drilling operations in the Chepaizi exploration and result in low drilling efficiency such as low core recovery rate,poor geological effect,repeated footage,etc.To overcome the problems existing in the actual drilling operation in Chepaizi exploration area,this paper studied and optimized a set of new low-solid non-dispersible drilling fluid configuration and maintenance technology through extensive review of relevant literature and a large number of field experiments.The new drilling fluid adopts broad-spectrum wall protection agent and sulfonated asphalt powder as the core materials,and has the characteristics of simple configuration and maintenance,good fluidity,low water loss,and forming thin and tough mud cake.In 2022,the new drilling fluid was actually used to carry out the construction test of wireline coring drilling combined with the electric direct drive drilling rig in the Chepaizi exploration area,and achieved safety,high quality and high efficiency outcome finally in the test drilling,which provide reference and guidance for future drilling in similar area.

关 键 词：绳索取心 不分散低固相钻井液 准噶尔盆地 可地浸砂岩型铀矿 

分 类 号：P634.3[天文地球—地质矿产勘探]