By M. A. Lovell
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The aim of utilized Geothermics for Petroleum Engineers is to give in a transparent and concise shape equipment of using the knowledge of temperature surveys in deep boreholes in addition to the result of box, laboratory and analytical investigations in geothermics to a large viewers. even though a few features of the topic of this publication were mentioned in numerous earlier books and various papers, utilized Geothermics for Petroleum Engineers is the 1st booklet in this subject on hand to the petroleum engineering group.
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2d. Forced water drive is primarily a drainage process, as water (the non-wetting phase) is now displacing oil (the wetting phase) from oilwet pores. Thus, the criteria for the displacement of oil by water during this stage of the cycle are similar to those governing primary drainage. Consequently, forced water drive will be termed 'water drainage' here. Let Pcwa be any intermediate capillary pressure during water drainage. The criteria for water invasion of a given pore are: (1) (2) (3) (4) the pore should be oil-wet (0 = 91-180°); the pore entry radius should satisfy the condition (Pcwd < (2acos(O)/r) < 0); (remember that Pcwd is now negative); a continuum of water from the inlet to the target pore should be present; (i) for strongly oil-wet pores ( 0 = 135180°), a continuum of oil or a continuous oil-wet cluster to the outlet is all that is required for escape; (ii) for weakly oil-wet pores (0 = 91-135°), an uninterrupted path of oil-filled pores is required.
1990a. Magma mixing in the subvolcanic environment: petrology of the Gerena interaction zone near Seville, Spain. Contributions to Mineralogy and Petrology, 205, 9-26. MORENO-VENTAS, I. & DE LA ROSA, J. D. 1990b. Microgranular enclaves as indicators of hybridization processes in granitoid rocks, Hercynian belt, Spain. Geological Journal, 25, 391-404. CHAPMAN, M. & RHODES, J. M. 1992. Composite layering in the Isle au Haut Igneous Complex, Maine: evidence for periodic invasion of a mafic magma in to an evolving magma reservoir.
Oil production during water imbibition The water imbibition capillary pressure curves as functions of produced OIP (oil in place) from single-valued and distributed contact angle networks are given in Fig. 12. The imbibition curve for the single-valued water-wet system ( 0 - - 0 ° for all pores in the network) is also given in Fig. 12b for reference. With single-valued contact angles, imbibition is maximum in a 100% water-wet system (a = 0) and diminishes monotonically with an increase in the fraction of oilwet pores.