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Water migration in shale could be the basement of all wellbore stability versions with chemical-mechanical coupling. A whole new experimental gear kinase inhibitor Torin 2 to measure in situ water diffusion coefficient of shale is designed in this paper. As well as a sample model to assess time-dependent collapse strain with chemical-mechanical coupling is presented. two. Experimental Research around the Hydration of ShaleThe totally free water and ion will penetrate into shale below the driving force of chemical possible and pressure variation between the pore fluid and drilling fluid [55�C58]. Water information of shale improvements by many mechanisms such as osmosis flow, viscous flow and capillary flow. Osmosis movement, driving force is because of chemical compounds and ions with diverse composition in drilling fluid and pore fluid.
In order to evaluate the hydration of drilling fluid, the coefficient of water absorption and diffusion along with the swellingEfaproxiral Sodium ratio must be determined 1st .two.1. Experimental Analysis on the Water Absorption of Shale2.one.1. Experimental Products Cherevent allow 1 finish face of shale sample contact with drilling fluid and the other finish face wrapped up by plastic film, then he measured the water content material increment in numerous area. But his experiment can only be carried out in space temperature and with zero confining strain. But through drilling approach in deep formation, it is actually within the problem of substantial temperatureSU11274 order and large strain. Shale hydration is influenced by temperature and pressure seriously, so his experimental end result was inconsistent with real drilling.
In order to check the coefficient of water diffusion of shale, we formulated an in situ test products of water diffusion coefficient which may match the downhole temperature and stress issue when drilling (Figure 1).Figure 1The experimental gear sketch.Technical parameters of this created equipment are as the following.Temperature: room temperature to 150��C, which might imitate the temperature issue with the formation with 5000 meters depth.Stress: confining strain 0MPa to 70MPa, axial pressure 0MPa to 200MPa.Imitate the maximum differential strain of drilling fluid with 10MPa.Sample size: ? 25mm �� 50mm.The experimental approach are as follows.Identify the authentic water articles with the rock samples initially, wrap the samples with separation sleeve, and put to the core holder.
Put the drilling fluid into the tank and check out the check system to generate sure it truly is in good problem.Flip within the temperature controller, warm the core samples on the identical temperature with downhole ailment. Then load the confining stress and axial pressure to right worth and start timing.Through the test, data acquisition management procedure is made use of to keep the check values continual.Cooling uninstall when the test time reaches the predetermined worth (50 hrs in this analysis), remove the rock samples promptly, and measure the water information at unique distance from your finish face.two.one.2.