A system for determining an adiabatic stress derivative of temperature for rock includes two pressure vessels containing a rock sample unit. The two pressure vessels are both filled with silicon oil. Bottoms of the pressure vessels are communicated with each other through an oil pipe. Each of the pressure vessels is communicated with a booster pump through an oil inlet pipe, and is provided with a pressure relief pipe at its top. Each of the oil pipe, the oil inlet pipes, and the pressure relief pipes is respectively provided with a drain valve. Each of the oil inlet pipes is respectively provided with a pressure sensor. Each of the rock sample units is respectively encapsulated in a rubber sleeve immersed in the silicone oil, and each rock sample is provided with temperature sensors on a surface and in a center thereof.

The expandable jacket consists of the rubber membrane surrounding the cylindrical specimen, circular segmental metal plates surrounding the rubber membrane, and elastomeric rubber bands or rings around the segmental plates to permit uniform radial expansion and maintain uniform diameter of the specimen during the test and thereby providing accurate values of deviator stress, volume change characteristics and shear strength of soil specimen. To determine the three-dimensional coefficient of consolidation and coefficient of consolidation in horizontal direction, the flexible ring consists of all above structural components of expandable jacket except that a filter fabric or paper is wrapped around the cylindrical specimen, and then rubber membrane is mounted surrounding the filter paper or paper. The calibration device for calibration of the expandable jacket and flexible ring shall provide the magnitude of correction to be made in deviator stress and lateral resistance provided by the rubber bands or rings during the test.

Provided is a device for testing a reaction between supercritical carbon dioxide and a rock. The device includes a carbon dioxide pressurization system, a reaction system, a contact angle test system and an observation system. The carbon dioxide pressurization system is configured to liquefy, heat and vaporize an initial carbon dioxide gas to obtain gaseous carbon dioxide. The reaction system is configured to regulate and control a temperature and pressure to change a state of the gaseous state to obtain supercritical carbon dioxide, and to enable the supercritical carbon dioxide to react with a sample. The contact angle test system is configured to convey a reaction residual water source and receive residual supercritical carbon dioxide, and to carry out a contact reaction of the residual supercritical carbon dioxide, the sample and the reaction residual water source.

A wide-temperature-range uniaxial and biaxial compression test device in a high-pressure hydrogen environment is provided. An upper computer is interacted with a temperature sensor, a gas pressure sensor, test pressure sensors, displacement sensors, an oxygen/hydrogen concentration monitor, a hydrogen filling system, a vacuum extraction system, a DIC test system, and the other components. The upper computer is used to achieve high-pressure hydrogen environment wide-temperature-range uniaxial and biaxial compression test based on different test modes. Tested engineering stress-strain data is processed to obtain real stress-strain data of rubber, and then the real stress-strain data is processed through a corresponding database to screen out a constitutive model capable of best characterizing the nonlinearity of the rubber specimen. Meanwhile, a strain distribution nephogram generated by a test result of a sample material can be analyzed, thus obtaining a deformation behavior and a failure fracture mechanism of the sample material.

A device for electrofracturing a material sample and analyzing the material sample is disclosed. The device simulates an in situ electrofracturing environment so as to obtain electrofractured material characteristics representative of field applications while allowing permeability testing of the fractured sample under in situ conditions.

Disclosed is an exemplary test apparatus having an autoclave head, a fretting mechanism connected on a first end to a first side of the autoclave head, a load train operably connected with a first end of the fretting mechanism, an autoclave adapter connected on a first side to a second side of the autoclave head, and a force balance assembly connected to a second side of the autoclave head and configured to equalize a pressure acting on the load train. Certain exemplary embodiments include an upper plate, a plurality of upper tie rods connected to a first side of the upper plate and a second side of the autoclave adapter, a lower plate, a plurality of lower tie rods connected to the first side of the autoclave head and a first side of the lower plate, and a pressure vessel sealingly connected to the first side of the autoclave head.

A method of measuring cement volumetric changes includes loading a sample cement into a flexible container and surrounding the flexible container by a column of fluid in a chamber. The temperature of the column of fluid is adjusted to a cement setting temperature, and the sample cement is allowed to set over several hours. The pressure of the column of fluid is adjusted to a test pressure. The temperature of the column of fluid in the chamber is adjusted to induce volumetric changes in the set cement. As the volume of the set cement changes, fluid volume adjustments are applied to the column of fluid in the chamber to maintain the pressure of the column of fluid in the chamber constant at the test pressure. The volumetric changes in the set cement are determined from the fluid volume adjustments applied to the column of fluid in the chamber.

A large-space high-temperature and high-pressure true triaxial flexible loading device includes a cylinder reaction frame, which includes a cylinder, a lower shear ring, an upper shear ring, a bottom cover, and a top cover, wherein the bottom cover and the top cover are detachably mounted at a bottom and a top inside the cylinder respectively, and an interior of the cylinder is divided to form a loading space for performing a triaxial test on a square test block; the lower shear ring is detachably embedded on an inner wall of the cylinder below the bottom cover; the upper shear ring is detachably embedded on the inner wall of the cylinder above the top cover; a confining pressure reaction frame, mounted in the loading space around the square test block; and, flexible loading mechanisms, disposed in pairs at two opposed side surfaces of the square test block.

The system for testing stress corrosion cracking (SCC) includes an autoclave having at least one heating element selectively actuated to heat the interior portion of the autoclave, the autoclave being configured for receiving a liquid and/or gas and for forming a corrosive fluid. The system also includes a circulation assembly having a flow line and a test section line. A plurality of test sections is positioned in series along the test section line and configured for receiving the corrosive fluid via the test section line once the required temperature is reached to expose the specimens directly to the corrosive fluid, the fluid flowing through a section of the flow line parallel to the test section line until the required temperature is reached. The circulation assembly includes a circulating pump, a flowmeter positioned along the flow line, and a pressure assembly mounted on the autoclave.

A device for a low stress triaxial test includes a test platform; a pressure chamber disposed on the test platform; a base disposed on the pressure chamber and fixed to the test platform; a support disposed on the test platform; a servo motor disposed on the support; a loading piston connected to the servo motor and penetrating into the pressure chamber; an axial force sensor disposed on the loading piston; a top cap detachably connected to the loading piston and covering the sample; a first pipeline connected to the base and passing through the test platform to connect with a measurement system; a second pipeline connected to the pressure chamber and passing through the test platform to connect with a confining pressure control system; and a third pipeline connected to the first pipeline and the top cap. The device can ensure the accuracy and authenticity of test results.