By Tarek Ahmed

Reservoir Rock homes and Fluid stream covers homes of normal rocks and fluids which are very important in Petroleum and typical gasoline Engineering. during this e-book significant emphasis is put on fluid garage in reservoir rocks and in stream of fluids during the rock's pore constitution. those phenomena dominate calculations which are universal within the components of reservoir and creation engineering. This booklet is designed for technical execs and introduces readers to the elemental in addition to the complicated points of reservoir engineering. Theoretical thoughts coupled with quite a few functional case histories are provided to help reservoir and exploitation engineers of their basic functions-the decision of oil and fuel reserves and the maximization of hydrocarbon restoration lower than fundamental, secondary, and tertiary schemes.Critical houses of reservoir rocks Fluid (oil, water, and fuel) PVT relationships the right way to calculate hydrocarbons in the beginning in position Dynamic strategies to evaluate reservoir functionality Parameters that influence well/reservoir functionality through the years

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Capillary pressure, and capillary rise in an oil-water system from the following data: 46 2. FUNDAMENTALS OF ROCK PROPERTIES y ¼ 30 r ¼ 10À4 cm rw ¼ 1:0 gm=cm3 sow ¼ 25 dynes=cm ro ¼ 0:75 gm=cm3 Solution Step 1. 28 psi higher than the water-phase pressure. Step 2. Calculate the capillary rise by applying Equation 2-33. h¼ ð2Þð25Þð cos 30 Þ ¼ 1766 cm ¼ 75:9 ft ð0:0001Þð980:7Þð1:0 À 0:75Þ Capillary Pressure of Reservoir Rocks The interfacial phenomena just described for a single capillary tube also exist when bundles of interconnected capillaries of varying sizes exist in a porous medium.

As shown by Cole (Figure 2-14), a tilted water-oil contact could be caused by a change in permeability across the reservoir. It should be emphasized that the factor responsible for this change in the location of the water-oil contact is actually a change in the size of the pores in the reservoir rock system. , permeabilities, are essentially uniform. 5 Low Permeability Well No. 1 Medium Permeability Well No. 2 Tilted pc or h FIGURE 2-14 57 CAPILLARY PRESSURE High Permeability Well No. 3 Water-Oil Contact pc Water-Oil Contact or h pc or h Sw Sw Tilted WOC.

From a reservoir engineering standpoint, the free-water level is defined by zero capillary pressure. , WOC, will be the same. This concept can be expressed mathematically by the following relationship: FWL ¼ WOC þ where pd Dr FWL WOC = = = = 144 pd Dr (2-35) displacement pressure, psi density difference, lb/ft3 free-water level, ft water-oil contact, ft Example 2-5 The reservoir capillary pressure-saturation data of the Big Butte Oil Reservoir is shown graphically in Figure 2-11. Geophysical log interpretations and core analysis establish the WOC at 5023 ft.

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