论文部分内容阅读
对现有各类型绳索取心钻具的功能、结构逐项进行深入分析和比较的基础上，我厂设计了JS75S-A、JS75D新型的绳索取心双管钻具和打捞器。该钻具经过4千米的生产试验（在煤系地层中钻进近2千米），取得了令人满意的效果。尤其是在提高钻具的打捞成功率、岩心采取率、提高到位报信和岩心堵塞报信机构工作的可靠性方面效果显著，受到了钻探工人的好评。JS75-A型钻具和JS75D打捞器的主要部位结构特点分述如下：
On the basis of in-depth analysis and comparison of the existing functions and structures of various types of cord coring drilling tools, the factory designs JS75S-A and JS75D new-type rope coring double-pipe drilling tools and salvage devices. After 4 kilometers of production testing (drilling nearly 2 kilometers in the coal formation), the drill achieved satisfactory results. In particular, it has been remarkably effective in improving the success rate of recovery of drilling tools, the rate of core collection, the improvement of the reliability of the work in place of letter service and core jamming letter agencies, and has been well received by drilling workers. JS75-A-type drill and JS75D salvage the main parts of the structural characteristics are described below: