井下工具尤其是固井工具或采油工具，其动作的实施和完成，常常依赖于定值剪断的销钉（简称剪销）。然而，井下工具剪销的剪切压力的可靠性和稳定性，常常影响了工具正常功能的实现。针对这一问题，设计了井下工具剪销压力测试系统（图１）。图中：１－手摇泵２－压力表３－管 Downhole tools, especially cementing tools or oil recovery tools, the implementation and completion of the action, often depends on the value of shear pins (referred to as the shear). However, the reliability and stability of shear stress in downhole tools often affect the normal function of the tool. In response to this problem, designed a downhole tool shear stress test system (Figure 1). In the figure: 1-hand pump 2-pressure gauge 3-pipe