By Izzy M. Kutasov, Lev V. Eppelbaum
The booklet includes elements: strain and move good checking out (Part I) and Temperature good checking out (Part II), and includes a variety of authors’ advancements. as a result of the similarity in Darcy’s and Fourier’s legislation a similar differential diffusivity equation describes the temporary stream of incompressible fluid in porous medium and warmth conduction in solids. for this reason it really is average to imagine that the thoughts and information processing tactics of strain good exams may be utilized to temperature good assessments. The publication offers new how you can confirm the formation of permeability and dermis components from assessments performed in simulated wells, designing interference good checks, processing consistent bottom-hole strain assessments, estimation of the formation temperature and geothermal gradients from temperature surveys and logs, in-situ determination of the formation thermal conductivity and phone 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 facts are proven on quite a few box examples from various areas of the world.
The publication is meant for college kids, engineers, and researchers within the box of hydrocarbon geophysics and geology, groundwater looking and exploitation, and subsurface setting exam. it is going to be additionally important for experts learning strain and temperature in parametric deep and superdeep wells.
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Additional resources for Pressure and Temperature Well Testing
In interference testing at least two wells are used: one well (the “active” well) is put on production or injection, and in the second “observational” well the pressure changes are observed during production (injection) and shut-in of the first well. The pressure response in the “observational” well enables estimation of the thickness (h)—formation permeability (k) product (reservoir transmissivity) and the hydraulic diffusivity of formations (J). After the value of J is determined the formation porosity—total compressibility product can be estimated.
2016 by Taylor & Francis Group, LLC Designing an Interference Well Test in a Geothermal Reservoir 53 For r = R and t > tp ⎡ ⎛ D ⎛ D⎞ pi − pws ( R, t ) = M ⎢ − Ei ⎜ − ⎟ + Ei ⎜ − ⎜ ⎝ t ⎠ ⎢⎣ ⎝ t − tp ⎞⎤ ⎟⎟ ⎥ , ⎠ ⎥⎦ (7-4) where pws is the bottom-hole pressure at the “observational” well after shut-in of the “active” well. Below we will also show that the time derivative of pws can be utilized in designing an interference test. The differentiation of the last equation yields • pws ( R, t ) = ⎛ dpws M D = exp ⎜ − ⎜ dt t − tp ⎝ t − tp ⎞ M ⎛ D⎞ ⎟⎟ − exp ⎜ − ⎟ .
The reservoir, well and oil properties data are presented in Table 4-1. Table 4-1. Reservoir and well data for two oil wells (McDonald 1983). Well IS-21, PT-1. 21 Well IS-7, PT-1. 1 Oil well IS-21, PT-1 A pressure buildup test was conducted in this well; the duration of the shut-in period was 48 hours. Using the type-curve matching approach it was determined that the start of the Horner straight line to begin after approximately 30 hours shut-in time. As mentioned by McDonald (1983): “Therefore, the straight line drawn through the latetime data on the Horner plot (Figure 4-1), although not well defined, still should be correct Horner straight line”.