High temperature and high pressure shale well wall stability evaluation device

Abstract

The invention relates to a high temperature and high pressure shale well wall stability evaluation device and belongs to the technical field of evaluation devices of test of hydrocarbon reservoir protection in the process of petroleum exploration and development. The high temperature and high pressure shale well wall stability evaluation device is characterized by comprising a well wall analog device, a triaxial cell (11), a mud container (14), a piston container (16), a constant-flux pump (17), an electric metering pump (18), a mud pump (20) and a data collection processing system. The high temperature and high pressure shale well wall stability evaluation device can carry out drilling fluid washing damage test on an analog well wall on the condition that temperature, pressure and circulating fluid flow are simulated. An imaging method is used for simulating degrees of hole enlargement, hole shrinkage and collapse after the well wall is eroded by external liquid, microwaves are used for measuring the degrees, and therefore the washing degrees of the well wall and wall building situation can be observed and recorded in real time. A new method for comprehensively evaluating influence of the drilling fluid and completion fluid on instability and collapse degree of the well wall is provided. Besides, the high temperature and high pressure shale well wall stability evaluation device has the advantages of being good in repeatability, simple in structure, convenient to operate, stable in performance and the like.

Description

Technical field: [0001] The invention relates to a high-temperature and high-pressure mud shale well wall stability evaluation device, which belongs to the technical field of experimental evaluation equipment for oil and gas layer protection in the process of petroleum exploration and development. Background technique: [0002] The wellbore instability problem is a worldwide problem in the oil drilling process, especially the downhole complex situation and other downhole accidents caused by it are extremely harmful to the drilling engineering. Wellbore instability seriously affects the speed, quality and cost of drilling, and it will also pollute the reservoir, adversely affect oil testing and oil and gas development, and even delay the exploration and development process, affecting the comprehensive economic benefits of oil and gas drilling and development. Therefore, preventing wellbore instability is a systematic project throughout the exploration and development of oil a...

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Problems solved by technology

According to the wellbore stability model of the film effect, a shale hydration / mechanical coupling experimental device, a shale film efficiency tester, a high-temperature and high-pressure wellbore stability tester, a core soaking device, and a high-temperature and high-pressure wellbore wall stability tester have been developed. Various instruments such as the stability simulation experimental device are used to evaluate the influence of drilling fluid on the stability of the wellbore wall, but the above-mentioned experimental devices cannot fully and truly reflect the influence of drilling fluid on the stability of the wellbore wall under downhole conditions

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