A thermal insulation control device and method for the inner wall surface of a core model tube

Abstract

The invention relates to a heat insulation control device and method for an inner wall surface of a rock core model pipe, and the device comprises a controller, a switch, a first temperature sensor, asecond temperature sensor, wherein the first and second temperature sensors are respectively disposed on the external and internal wall surfaces of the rock core model pipe, and the switch is a single-pole single-throw switch. The positive end of the first temperature sensor is connected with the positive end of the input end of the controller, the negative end of the first temperature sensor isconnected with the negative end of the second temperature sensor through the switch, and the negative end of the input end of the controller is connected with the positive end of the second temperature sensor. The output end of the controller is connected with a heating device, and the heating device is disposed on the rock core model pipe body. The two collected temperature signals are connectedwith an input signal end of the controller through one switch. After the switch is switched on, two signals are in parallel, i.e., inputting a difference signal of the outer wall temperature and the inner wall temperature into the controller. When the device is in use, only the switch needs to be switched on according to the requirements of the heat insulation, and a corresponding target temperature value is set for use.

Description

Technical field [0001] The invention belongs to the field of energy and environment, and particularly relates to an adiabatic control device and method for the inner wall surface of a core model tube. Background technique [0002] Heat preservation and insulation is a scientific and highly efficient energy-saving technology that slows down the heat dissipation and conduction speed. The better the insulation measures, the closer to the adiabatic boundary. At present, there are two main thermal insulation methods. One is to use thermal insulation materials or vacuum structures. Thermal insulation materials are generally materials with a guiding thermal coefficient less than or equal to 0.2. There are many types of thermal insulation materials, including aerogel felt, foam plastic, and minerals. Cotton products, foam glass, expanded perlite insulation products, rubber powder EPS particle insulation slurry, mineral spray cotton, phenolic foam, etc. The principle is based on the low ...

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Problems solved by technology

Both methods fail to form a true adiabatic boundary condition

In the first method, the use of low thermal conductivity insulation materials and vacuum structures can only partially reduce heat loss. In addition, for pressure vessels, the heat storage of the material itself will cause heat loss; in the second method, Since the external heating power is adjusted by the mainstream temperature, setting it too high or too low will cause over-compensation or under-compensation respectively, and it is impossible to accurately control the working condition of the mainstream temperature.

[0004] In the simulation experiment of thermal oil recovery, the core model tube is a necessary rigid constraint to form a formation high pressure environment and ensure the injection of thermal fluid. Compensation will cause a large amount of heat loss and cannot effectively heat the core. The existing solution is to directly place the core model tube in a constant temperature box and control the temperature to be the same as the temperature of the injected thermal fluid. However, this method can only obtain oil displacement efficiency. It is impossible to describe the dynamic process of temperature and pressure in the entire displacement process and the whole process of the change of the quality of the produced oil. Therefore, the development of a control method that can realize the complete insulation of the inner wall of the core model tube is very important for the whole process of the real-state simulation of the thermal oil displacement process. Thermophysical and thermochemical characteristics are very important

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