A full-scale borehole stability simulator

Abstract

The invention discloses a full-size well wall stable simulator. The full-size well wall stable simulator comprises a sealing rubber sleeve (18) arranged outside a rock core in a sleeved mode. The two ends of the sealing rubber sleeve (18) are respectively provided with an axial load piston. A well wall visual and imaging system and a stratum sliding wave sound velocity test system are arranged in the axial load pistons. A high-temperature autoclave body (28) is arranged outside the sealing rubber sleeve (18) in a sleeved mode. A confining pressure inlet (29) is connected with a confining pressure adjusting system. The upper axial load piston (6) and the lower axial load piston (7) are connected with a high-pressure pipeline connecting high-pressure mud circulating system and a high-pressure pipeline connecting pore pressure system respectively. The upper axial load piston (6) is further connected with an overburden pressure control system. The full-size well wall stable simulator has the advantages that the subsurface environment can be more vividly simulated, the well wall stable condition can be dynamically evaluated, circulating media can be changed, optimization of a drilling method and a drilling liquid system is facilitated, the near well wall stratum permeability and the rock sound wave characteristic can be comprehensively evaluated, well wall imaging is achieved, observation is more visual, and practicability is high.

Description

Technical field [0001] The invention relates to the technical field of an experimental evaluation method for simulation study of borehole stability in oil and gas field exploration and development, in particular to a full-scale borehole stability simulator. Background technique [0002] The instability of the wellbore is a big problem that is common in the exploration and development of oil and gas fields and has been plagued by the oil industry. The instability of the borehole wall seriously affects the speed, quality and cost of drilling. According to conservative estimates, the instability of the borehole wall causes the world oil industry to lose 500 to 600 million US dollars every year, and the instability of the borehole wall causes the drilling fluid to penetrate into In the reservoir, the reservoir is contaminated, which has an adverse effect on the exploitation of oil and gas fields, which severely restricts the process of exploration and development. Therefore, maintai...

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Problems solved by technology

However, these instruments cannot simulate the real high temperature and high pressure downhole mechanical environment, cannot comprehensively evaluate the impact of different drilling methods on the stability of the borehole wall, cannot comprehensively evaluate the performance of drilling fluid, rock acoustic characteristics and formation permeability, and the measurement parameters are limited and cannot be intuitive Response to Situation After Borehole Wall Instability

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