为了解决青山口组页岩油井内普通常规压差式趾端滑套无法满足全井筒试压的问题，基于常规压差式滑套的开启原理，设计了满足全井筒试压条件的延时开启趾端滑套样机。利用数值模拟和室内试验手段进行了验证分析。结果表明：①该工具内受液压110 MPa，其内最大应力值为835.935 MPa，小于材料许用应力930 MPa，工具满足设计要求；②当延时阀喷嘴直径0.5 ~ 0.6 mm时，数值模拟与理论计算结果较为接近；③当剪销个数小于等于5时，该种滑套开启压力试验值近似等于其理论计算值，且相对误差值最小为1.64%；当剪销个数为6，加装延时机构时，工具剪断销钉后能够延时28.3 min开启，与预设值相对误差仅5.67%。

In order to solve the problem that conventional normal pressure differential toe-end sliding sleeves in Qingshankou Formation shale oil wells cannot meet the full wellbore pressure test, based on the opening principle of conventional differential pressure sliding sleeves, a delayed opening toe-end sliding sleeve prototype that meets the full wellbore pressure test conditions was designed. Verification analysis was carried out using numerical simulation and indoor testing methods. The results show these as follows. The tool is subject to a hydraulic pressure of 110 MPa, and the maximum internal stress value is 835.935 MPa, which is less than the allowable stress of the material 930 MPa. The tool meets the design requirements. When the diameter of the delay valve nozzle is between 0.5 mm and 0.6 nm, the numerical simulation and theoretical calculation results are relatively close. When the number of shear pins is less than or equal to 5, the test value of the sliding sleeve's opening pressure is approximately equal to its theoretical calculation value, and the relative error value is at least 1.64%; when the number of shear pins is 6 and a delay mechanism is installed, After the tool shears the pin, it can be opened with a delay of 28.3 minutes, and the relative error with the preset value is only 5.67%.