By Izzy M. Kutasov, Lev V. Eppelbaum
The booklet contains elements: strain and circulate good trying out (Part I) and Temperature good checking out (Part II), and comprises quite a few authors’ advancements. as a result of similarity in Darcy’s and Fourier’s legislation an identical differential diffusivity equation describes the brief stream of incompressible fluid in porous medium and warmth conduction in solids. for that reason it's average to imagine that the suggestions and information processing methods of strain good checks should be utilized to temperature good exams. The ebook offers new how to confirm the formation of permeability and pores and skin components from checks performed in simulated wells, designing interference good assessments, processing consistent bottom-hole strain exams, estimation of the formation temperature and geothermal gradients from temperature surveys and logs, in-situ determination of the formation thermal conductivity and call thermal resistance of boreholes, temperature regime of boreholes (cementing of creation liners), and the restoration of thermal equilibrium in deep and superdeep wells. Processing and research of strain and geothermal info are proven on a number of box examples from varied areas of the world.
The booklet is meant for college kids, engineers, and researchers within the box of hydrocarbon geophysics and geology, groundwater looking and exploitation, and subsurface atmosphere exam. will probably be additionally important for experts learning strain and temperature in parametric deep and superdeep wells.
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Example text
Then the formation permeability can be determined from Eq. (4-21) and, finally the skin factor can be estimated from Eq. (4-19). 0002637 kt p t Dapφ ct μ , s = − ln © 2016 by Taylor & Francis Group, LLC rwa . rw (4-30) 28 Pressure and Temperature Well Testing B. The value of the initial reservoir pressure is not known. At least three measurements of pressure (pwf , pws1, pws2) at t = tp, Δt = Δt1, and Δt = Δt2 are needed to calculate the formation permeability, initial reservoir pressure and skin factor.
Then the formation permeability can be determined from Eq. (4-21) and, finally the skin factor can be estimated from Eq. (4-19). 0002637 kt p t Dapφ ct μ , s = − ln © 2016 by Taylor & Francis Group, LLC rwa . rw (4-30) 28 Pressure and Temperature Well Testing B. The value of the initial reservoir pressure is not known. At least three measurements of pressure (pwf , pws1, pws2) at t = tp, Δt = Δt1, and Δt = Δt2 are needed to calculate the formation permeability, initial reservoir pressure and skin factor.
In the practice the values of qD are estimated from Eq. (5-3). 3 Example Using the table (Sengul 1983) of qD* = f(tD) we generated data for this simulated example. The reservoir, well, and fluid data (Table 5-2) were chosen to allow to avoid interpolation of qD* values. Let us now assume that the well started to produce oil and the well’s skin factor is equal to zero. Later, after some time of production, a constant BHP test was conducted and it was found that due to formation damage the skin Table 5-2.