Measuring device and measuring method for rock high temperature compression coefficient and permeability

Abstract

The invention relates to a measuring device and a measuring method for rock high temperature compression coefficient and permeability. The measuring device is characterized by comprising a high pressure kettle, a heating system, a confining pressure pump system, a pore pressure pump system, a first air release valve, a second air release valve, a temperature controller and a control system; a rock core is fixedly arranged on the middle part of the high pressure kettle; a temperature sensor is arranged on the inner side of the high pressure kettle; the heating system is fixedly arranged on the outer periphery of the high pressure kettle; the high pressure kettle is respectively connected with the confining pressure pump system, the pore pressure pump system, the first air release valve and the second air release valve through the heating system by the first to fourth high pressure pipelines; the temperature controller is used for heating the confining pressure fluid in the high pressure kettle and the rock core through the heating system and monitoring the rock core temperature in real time through the temperature sensor; the control system is used for controlling the confining pressure pump system and the pore pressure pump system to apply confining pressure and pore pressure into the high pressure kettle and monitoring the downstream pressure change of the pore pressure system in real time through the pressure sensor. The measuring device can be widely applied to the field of development and research for thick oil thermal recovery and development of geothermal resources.

Description

technical field [0001] The invention relates to a measuring device and measuring method for high-temperature compressibility coefficient and permeability of rock, and belongs to the research field of thermal recovery of heavy oil. Background technique [0002] The rock compressibility coefficient is an important parameter reflecting the amount of energy that the reservoir rock can provide. A large rock compressibility coefficient indicates that the elastic driving energy of the reservoir is very sufficient. Therefore, the rock compressibility coefficient is very important for reservoir development, especially for development similar to natural energy The production capacity evaluation and index forecast of throughput development have a greater impact. At the same time, as oil and gas are continuously produced, the reservoir pressure will gradually decrease, resulting in a change in reservoir permeability. Therefore, understanding the change law of reservoir compression chara...

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Problems solved by technology

[0003] At present, the test of rock pore volume compressibility mainly adopts the national oil and gas industry standard named "Measurement Method of Rock Pore Volume Compressibility Coefficient", and the measurement of permeability mainly adopts "Measurement Method of Rock Porosity and Permeability under Overburden Pressure" According to the national oil and gas industry standard, a single method and equipment are often used to measure the permeability characteristic parameters of rocks, such as using a permeameter to measure permeability and a flow compressibility meter to measure compressibility. It is impossible to measure the same rock sample at the same time. compressibility and permeability, and it is impossible to simultaneously measure the change characteristics of the above two parameters under the condition of high temperature and complex stress changes.

[0004] In recent years, although people have tried to improve the test methods of compressibility coefficient and permeability in laboratory experiments, due to the complex lithological structure of the formation, the experiments have certain limitations and large errors

Researchers have developed a core pore compressibility testing device and its testing method, and a transient steady-state simultaneous testing device and method for tight rock permeability. measurement, and the degree of automatic control has been greatly improved, but the influence of temperature on the test results was not considered in the test process, and the compressibility and permeability of the reservoir rock under the condition of underground temperature and pressure cannot be accurately measured. In fact, at high temperature and high pressure The physical and mechanical properties of porous media in the formation will change, resulting in changes in compressibility and permeability

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