The paper analyses functions and characteristics of all kinds of workover rig, proposes out existing problems during well workover.
文中分析了各类型号修井机的功能和特点，提出了在修井过程中存在的问题；
A test rig for testing the flow characteristics of ball orifice is introduced. Experiments on the flow characteristics of ball orifices with different structure parameters are carried out.
介绍了球阀阀口流量特性试验装置，对水压球阀在不同结构参数下的流量特性进行了试验研究。
A test rig for testing the flow characteristics of ball orifice is introduced. Experiments on the flow characteristics of ball orifices with different structure parameters are carried out.
介绍了球阀阀口流量特性试验装置，对水压球阀在不同结构参数下的流量特性进行了试验研究。
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