High-temperature water-wet maintenance simulation test device and method of cement stone of thermal production well

Abstract

The invention discloses a high-temperature water-wet maintenance simulation test device and method of cement stone of a thermal production well. The device is mainly composed of a nitrogen source (1),an intermediate water container (5), a CO2 gas source (10), a flowmetre (12), a closed kettle body A (13), a pressure gage (17), a condenser (19) and a heating furnace (22); cement stone (24) is putin the closed kettle body A (13); the closed kettle body A (13) is in the heating furnace (22); a water inlet is at the lower part of the side part of the kettle body A; the water inlet is separatelyconnected to the flowmetre (12) and a heating pressure manifold (11); the heating pressure manifold (11) is connected to the intermediate water container (5) and the nitrogen source (1), and also connected to the CO2 gas source (10); a water outlet is at the upper part of the side end of the kettle body A; the water outlet is connected to the pressure gage (17) and the condenser (19); the maintenance method can be used for simulating acid medium corrosion of cement stone of the thermal production well at different temperatures; and, if the closed kettle body A (13) is replaced by a closed kettle body B (25), the method can be used for testing the shear cementing strength and the channeling pressure of the cement stone in a high-temperature water-wet environment. The high-temperature water-wet maintenance simulation test device and method in the invention are reliable in principle and simple and convenient to operate, and have wide market prospect.

Description

technical field [0001] The invention relates to a maintenance simulation test device and method for cement stone in a high-temperature and water-humidity environment in the process of heavy oil thermal recovery, which can be used for tests and researches on aspects such as testing and evaluating the influence of cement stone in thermal recovery wells by the high-temperature and water-humidity environment. Background technique [0002] The cement strength, interface cementation and corrosion of thermal recovery wells under ultra-high temperature and water humidity environment have always been a major challenge and difficult problem in the field of oil and gas well engineering. Accurately simulate the harsh service environment of cement stone in the well and analyze the change of cement stone strength , Separation ability performance, and corrosion law are important prerequisites for evaluating the safety of heavy oil thermal recovery wells and guiding thermal recovery well cem...

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Problems solved by technology

In recent years, some people have also developed a device for high and low temperature carbonization corrosion experiments (Cheng Xiaowei, Zhang Mingliang, Li Zaoyuan, Zhang Xingguo, Guo Xiaoyang. Research on the failure evolution of cement stone in sanded oil wells under the condition of burning oil reservoirs, Silicate Bulletin, Issue 4, 2016) , but this kind of device cannot maintain the environment of continuous high temperature and water humidity, and the corrosion test is only for the carbonization of cement stone, and does not involve the corrosion of cement stone under high temperature and water humidity

Chinese patents "Ultra-high temperature oil well cement stone curing kettle and its use method" (CN104070596A), "A high-temperature and high-pressure cementing cement sheath mechanical integrity testing device and method" (CN104405366A), "High-temperature and high-pressure cementing one and two Interface sealability test device and method" (CN104406910B), etc., these devices cannot provide excessively high temperature (500°C) on the one hand, and cannot continuously provide hot steam or mixed humid gas of water vapor and acid gas on the other hand, so they cannot Completely simulate and reflect the actual working conditions of downhole high temperature, water humidity and corrosion when heavy oil is recovered in different periods of thermal recovery wells. At the same time, cement stone and casing are connected together and fixed downhole, so the connection between cement stone and casing is studied It is extremely difficult to resist high temperature and corrosion when they are together, so these devices cannot be applied to the research of high temperature and corrosion resistance of cement stone in thermal recovery wells

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