By R.P. Monicard, D. Berley
This ebook describes porous media and the way their actual, petrophysical, mechanical, electrical and superficial houses are decided. the several measuring equipment and the corresponding gear are defined. middle research (conventional or specified) required for any reservoir engineering operation or for utilizing mathematical types is defined. Analyses of sidewall cores and full cores also are defined intimately. real core-analysis examples are given. The ebook should be necessary for engineers and technicians in laboratories facing the physico-chemistry of hydrocarbon fields and the hydrology of underground nappes. experts in reservoir engineering also will locate the e-book really priceless.
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Additional resources for Properties of Reservoir Rocks: Core Analysis
H0 - f)J') (Eq. 1) 22 1 Porosity of reservoir rocks it follows that: and Vp (Eq. 2) ¢ =-·100 VT Pore volume is equal to the volume of mercury withdrawn in order to make the pressure drop by one half atmosphere. In reality atmospheric pressure is not always 76 cm of mercury, and corrections of the pump are necessary because of trapped air, etc. Ho and t::.. Vp Vp = Const. Ho =.!. 1= I ' Ho pore volume pump reading = Vp t::.. V The coefficient I depends upon the volume of air contained in the pores and on the tlP adopted which is close to one half atmosphere .
I \\. \. 7 6 ~\ • '\\ \ 3 '\ \ t \ \ \i' 1 \ t 3. ' 0 in % Fig. 12. Fonnation factor. Porosity relationship. 67"/00 30 1 Porosity of reservoir rocks It the formation contains oil, its resistivity increases. Tixier introduces the resistivity R j of the zone which is invaded by mud filtrate and the true resistivity of the uncontaminated formation R t . 3. Determination of ~ by microresistivity logs The following logs are utilized: (a) Micrologging for soft formations. (b) Microlaterologging for hard formations.
11) in which perfect permanent flow exists. Upstream and downstream pressures, respectively PG and PF are constant. The mass flow Qm is the same in all slices and for each slice is related to the volume flow rate Q by: where = gas density in the slice where the pressure is p. , where Qm = Q bp p I Q= - . Q bp m Sand Fig. 11. Linear flow of a perfect gas in sand-filled tube. 2 Permeability of reservoir rocks 51 Sk dp Taking into account (Eq. 11), Q = - • - , we obtain: fJ. Q m =- . 11) a differential relating p to distance x.