High-temperature and high-pressure volume expansion and shrinkage tester of oil well cement

The invention provides a high-temperature and high-pressure volume expansion and shrinkage tester of oil well cement, and belongs to the field of volume expansion and shrinkage test devices of the oil well cement. The tester comprises a high-temperature and high-pressure kettle, a temperature control system, a pressure control system, a controller and a computer data processing system. The tester can simulate the volume shrinkage rate and the volume expansion rate of the oil well cement in a vertical well and a horizontal well at a maintenance temperature under a maintenance pressure, and record a temperature-pressure curve and a time-expansion/shrinkage rate curve. The tester provided by the invention has the advantages of adjustable experiment pressure, automatically-controlled experiment temperature, real-time display of the experiment pressure and the experiment temperature, real-time display of the volume expansion/shrinkage curve of a cement mortar, simple experiment operation, automatic output and pres