High temperature and high pressure visualization wellbore gas-liquid flow state simulation experiment device and method

Abstract

The invention relates to a high temperature and high pressure visualization wellbore gas-liquid flow state simulation experiment device and a method thereof and belongs to the technical field of wellbore gas-liquid flow state study in the oil and gas development process. The high temperature and high pressure visualization wellbore gas-liquid flow state simulation experiment device is characterized in that the experiment device comprises a wellbore system, a gas-water pressurization injection system and a visualization monitoring system; the gas-water pressurization injection system simultaneously injects gas and liquid into the wellbore system, and the visualization monitoring system conducts monitoring. Further provided is the experiment method adopting the above-mentioned device. With mutual cooperation of various parts such as a high temperature and high pressure visualization wellbore model, the gas-water pressurization injection system and the visualization monitoring system, thehigh temperature and high pressure visualization wellbore gas-liquid flow state simulation experiment device and the method have the advantages of being capable of simulating and monitoring gas-liquid two-phase flow patterns under different gas-liquid ratios and different flow rates when the pressure in a wellbore is lower than 30 MPa and the temperature is lower than 150 DEG C, being capable ofsimulating vertical to horizontal and intermediate any angle well conditions, realizing disassembly and self-assembly of the experiment device, and achieving repeated use and low cost.

Description

technical field [0001] The invention relates to a high-temperature and high-pressure visualized wellbore gas-liquid flow state simulation experiment device and method, and belongs to the technical field of wellbore gas-liquid flow state research in the oil and gas development process. Background technique [0002] Since the "Eleventh Five-Year Plan", my country's gas fields (low permeability-tight gas, shale gas, coalbed methane, etc.) have entered the stage of large-scale exploration and development, and four major basins have been formed, including Sichuan, Ordos, Zhungeer and Tarim. It is a representative natural gas production base. On the one hand, with the development of gas reservoirs, the formation energy is gradually exhausted, the output gradually decreases, and the formation begins to produce water; on the other hand, the development of gas and water co-injection has become one of the important development methods of oil and gas fields. Therefore, multiphase flow ...

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Problems solved by technology

[0003] At present, the commonly used multiphase pipe flow wellbore models are mainly transparent plexiglass pipes, as is the representative multiphase flow simulation device of the State Key Laboratory of Oil and Gas Reservoir Geology and Development Engineering of Southwest Petroleum University (Ma Xiaolong. Nanbao water-producing gas well Foaming agent optimization and downhole agitator development [D]. Chengdu: Southwest Petroleum University, 2015), the advantage is that it can realize the whole process of visualization of the flow process in the miscellaneous wellbore after gas-liquid mixing, but it can withstand the experimental pressure below 0.5MPa, Therefore, it is impossible to simulate multiphase pipe flow under high pressure conditions; in addition, transparent plexiglass pipes generally work at room temperature, and it is difficult to simulate multiphase pipe flow under medium and high temperature conditions

In order to meet the high-pressure simulation conditions, Wang Zhiyuan of China University of Petroleum (East China) (Research on the flow regime transformation mechanism of annular multiphase flow with natural gas hydrate phase transition [D]. Qingdao, 2009) used stainless steel pipes to design and process the multiphase flow The wellbore is simulated, but the model cannot use the visualization method to identify the flow pattern, but conducts indirect identification based on the characteristic parameter curve of the porosity wave, such as the fluctuation curve and PDF curve; in addition, the stainless steel model is not installed with heating and heat preservation devices. Therefore, it does not have the conditions to carry out medium and high temperature simulation experiments

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