High-temperature high-pressure multifunctional horizontal well damage appraisement instrument

The invention relates to a high temperature and high pressure multi-functional horizontal well damage assessment instrument which mainly comprises a working fluid cycle kettle body, a long core gripper, three short core grippers, a confining pressure pump, a collection control box, and a bracket; the long core gripper and the short core grippers are connected together by the cycle kettle body and supported by the bracket with the angle of 90 degrees respectively and the axial lines on the same plane; the top part of the cycle kettle body has a pressurizing hole; the bottom part of the cycle kettle body has a fluid discharge port; the cycle kettle body has a magnetic rotor; the plunger of each gripper is hollow and is connected with a flowmeter; a rubber sleeve has an electrode, a pressure measurement point and an electrode measurement point, and the like; and the internal part of the collection control box has a temperature controller, a cycle motor controller and a data acquisition card. The invention has high automatic degree, can simulate the damage on the top part, side part and bottom part of the horizontal well body caused by the working fluid in the drilling process of the horizontal well under the temperature and pressure conditions, monitor the filtration loss process of the working fluid and the changing situations of the resistivity and pressure of the long core at different sections along with the time, and evaluate the damage degree and depth on different parts of the long core caused by the working fluid.