为适应我国深井和超深井的钻探需要,我厂试制了一种用于超深井钻机的JZ400型指重表。1977年4月,经厂内调试检验,仪表达到了设计要求,又于同年8月在四川省石油管理局石油沟气矿4096钻井队进行了现场试验,性能良好,基本符合现场使用要求。一、主要技术性能 In order to meet the drilling needs of deep and ultra-deep wells in our country, our factory trial-produced a JZ400 type finger rest gauge for ultra-deep well drilling rigs. In April 1977, after in-plant commissioning test, the instrument met the design requirements. In August of the same year, it also conducted on-site tests at the 4096 drilling team of Petroleum Migo Gas Station of Sichuan Provincial Petroleum Administration with good performance and basically meeting the requirements of on-site use. First, the main technical performance