5.密闭测试 在钻井过程中,有时可能要对某一层段进行一次地层测试,测试其生产能力。为此,通常在钻柱下面配备一套测试管柱,待封隔器封隔地层打开测试阀时,地层流体就流入钻杆。如果地层压力充足,地层液可自喷到地面;如果地层压力不足,在回收管柱时,钻杆中的地 5. Closed Test During drilling, it is sometimes necessary to conduct a formation test on a certain interval to test its production capacity. For this reason, a test string is usually provided under the drill string, and the formation fluid flows into the drill string when the packer closes the formation and opens the test valve. If the formation pressure is sufficient, the formation fluid can be sprayed from the ground; if the formation pressure is insufficient, when recovering the string,