我勘探处现有百分之八十的钻井队使用NB_8-600型泥浆泵,其中大部分泵的阀箱都已经过改造。但是在实际使用中,阀箱口和镶口钢圈仍常被刺坏。不久前,在马15井用一台NB_2-600泵摆在1号泵位置上钻井,第一次开钻用φ170毫米缸套。当第二次开钻换用φ140毫米缸套时,钻进不久,即发现右排缸前上水阀箱显示孔漏泥浆,不能承受压力。经拆 Eighty-eight percent of drilling rigs at my prospect use the NB_8-600 mud pump, most of which have been retrofitted with valve boxes. However, in actual use, the valve box mouth and mouth ring is still often stabbed. Not long ago, a well NB_2-600 pump was used to drill No. 1 pump at Ma 15 well, the first time using φ170mm liner. When the second drill for φ140 mm cylinder liner, drilling soon, that is found in the right row before the tank on the valve box leakage mud leakage, can not withstand the pressure. Demolished