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

Abstract

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 preservation of experiment results, automatic generation of an experiment report, reasonable structure and layout, and concise appearance.

Description

technical field [0001] The invention belongs to the field of volume expansion and contraction measuring devices for oil well cement, in particular to a high temperature and high pressure volume expansion and contraction tester for oil well cement, which is used for testing and comparing the expansion and contraction properties of different cement slurry systems in different well conditions. Background technique [0002] At present, the existing high temperature and high pressure dilatometers include: [0003] "Non-contact high temperature and high pressure intelligent dilatometer" (application number 200420064869.4): This patent provides a high temperature and high pressure dilatometer for measuring the expansion properties of clay, but this instrument cannot be used to measure the expansion and contraction ratio of cement slurry in horizontal wells , and the experimental temperature does not reach 170°C. [0004] "High Temperature and High Pressure Dilatometer" (Applicatio...

AI Technical Summary

Problems solved by technology

At present, in this industry, measuring equipment such as concrete shrinkage expansion rate tester or screw micrometer is often used to measure the length value before and after shrinkage. Although this can measure the linear expansion of cement stone, neither of them can accurately measure cement. The volume expansion rate of the slurry; the intuitive measurement of the real-time expansion of the cement slurry cannot be realized, and the real-time recording of the experimental data cannot be realized; it is even more impossible to simulate and measure the expansion performance of the cement slurry under high temperature and high pressure conditions in vertical wells and horizontal wells

Images