The results of experiment in oil fields show that it can simulate the signals of downhole instruments and resolve the problem of self-test of ground system.
油田现场试验表明，它完全可以模拟井下仪器，解决了地面系统的自检问题。
Methods used have been gravity, ground and airborne magnetics, ground and airborne electromagnetics, IP/resistivity, downhole geophysical logging, and reflection seismic.
使用的物探方法有重力、地面和航空磁法、地面和航空电磁、IP／电阻率法、钻孔物探测井及地震反射。
The ground stress, formation pressure, desorption pressure and many inferred values, gained from these basic data of a certain coal bed in downhole may be obtained through testing and calculation.
对于井下某一煤层，通过测试和计算可得到地应力、地层压力、解吸压力以及据以上基础数据而得出的许多推算值。
A cementing method of separable setting and variable density is used, with two level controls of safety valve on the ground and downhole;
采用双凝固井、变密度固井方式，均采用地面和地下两级安全阀控制；
A cementing method of separable setting and variable density is used, with two level controls of safety valve on the ground and downhole;
采用双凝固井、变密度固井方式，均采用地面和地下两级安全阀控制；
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