TCP负压射孔工具对真实负压值的影响研究

Effect of TCP Negative Pressure Perforating Tool on Real Negative Pressure Value

TCP负压射孔工艺在渤海油田广泛应用,但目前采用的TCP负压射孔工具从设计原理上忽略了负压阀联通孔泄压延时性和点火棒在短油管内下落速度非瞬时性等问题,常常导致泄压未完成即触发点火,产生的真实负压值小于设计值。为此,综合考虑TCP负压射孔井下流体、工具等实际情况,建立了负压阀联通孔流体流动模型和点火棒下落速度模型,并对影响真实负压值的相关参数进行了分析,为负压值设计和现场计算提供更准确的理论指导。

TCP negative pressure perforation technology is widely used in Bohai Oilfield, but the design principle of the current TCP negative pressure perforation tool neglects the pressure relief delay of negative pressure valve connection hole and the non-instantaneity of the falling speed of ignition rod in short tubing, which often leads to trigger ignition when the pressure relief is not completed, and the real negative pressure value is less than the design value. Therefore, considering the actual situation of downhole fluid and tools in TCP negative pressure perforation, the fluid flow model of negative pressure valve connection hole and the falling velocity model of ignition rod are established, and the relevant parameters affecting the real negative pressure value are analyzed, which provides more accurate theoretical guidance for the design and field calculation of negative pressure value.