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美国内务部,矿物管理服务(MMS)要求在潜在的浅层钻井危险区必须安装导管柱和表层套管。但在LWD测井确认出的安全区域MMS对使用导管柱和表层套管不作要求,且LWD代替电缆测井评估浅地层有明显优势。模型显示在纵波慢度接近钻井泥浆慢度时LWD可以测量出纵波慢度。在大井眼和超慢速地层,91/2in的LWD声波仪器采集浅层数据是非常合适的。因此钻井时,实时的LWD测井可以确证出该地层有没有浅层气藏,且被MMS接受。这样,在多井项目操作中,可以降低电缆项目的操作费用,也节省出拆卸导管柱和表层套管的费用,可以节约215万USD左右。
The U.S. Department of Interior, the Mineral Management Service (MMS), requires the installation of a guidepost and a surface casing in potentially shallow drilling danger areas. However, the safe area MMS identified by LWD logging is not required for the use of conduit columns and surface casing, and LWD has the obvious advantage of evaluating shallow formations instead of cable logging. The model shows that LWD can measure the longitudinal wave slowness when compressional slowness is close to the slowness of drilling mud. In large boreholes and ultra-slow formations, 91 / 2in LWD sonic instruments to collect shallow data is very suitable. Therefore, real-time LWD logging can confirm whether there is a shallow gas reservoir in this formation and is accepted by MMS when drilling. In this way, multi-well project operations can reduce the operating costs of cable projects and also save about $ 2.15 million by removing the cost of removing the column and casing.