By Professor Gian Luigi Chierici (auth.)
Volume 1 of this e-book handled the innovations at the back of the purchase, processing and interpretation of uncomplicated reservoir facts. This moment vol ume is dedicated to the examine, verification and prediction of reservoir behaviour, and techniques of accelerating productiveness and oil restoration. I should still prefer to convey a number of issues to the reader's recognition. to begin with, the remedy of immiscible displacement by way of the strategy of features. the benefit of this technique is that it brings into proof some of the actual points of the method, in particular its dependence at the homes of the fluids involved, and at the pace of displacement. It was once now not till after the e-book of the 1st, Italian, version of this ebook (February 1990) that i found an analogous remedy within the e-book more suitable Oil restoration, by way of Larry W. Lake, released in 1989. one other subject that I may still prefer to deliver to the reader's awareness is the forecasting of reservoir behaviour by means of the tactic of pointed out versions. This unique contribution to reservoir engineering is predicated on platforms idea - a technological know-how which may still, in my view, locate some distance wider applica tion, in view of the "black field" nature of reservoirs and their responses to creation processes.
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Quantity 1 of this publication handled the thoughts at the back of the purchase, processing and interpretation of easy reservoir facts. This moment vol ume is dedicated to the research, verification and prediction of reservoir behaviour, and techniques of accelerating productiveness and oil restoration. I may still prefer to convey a couple of issues to the reader's recognition.
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This offers a number of computational advantages, already described. 3 Total Layer Thickness h t Much Greater Than the Height he of the Capillary Transition Zone When the total thickness h t of the oil-bearing interval is much greater than the height he of the capillary transition zone, we can quite reasonably ignore the influence of the latter on both the average water saturation Sw, and the biphasic flow of oil and water. For flow occurring under VE conditions (Sect. 1), we can define the height hw of the water table above the base of the layer at any point in the layer (Fig.
Schematic of the entropy condition at the front: the velocity of Sw behind the front is greater than its velocity ahead of the front The value of Vf obtained from Eq. 26) also satisfies the so-called entropy condition. In physical terms, this means that in its advance, the front must remain infinitesimally thin, with no tendency to spread out - introducing, in our case, a more gradual change in saturation. The entropy condition is met if the velocity of the water saturation behind the front, v(Sw,d, is greater than the velocity Vf of the front itself, and if this in turn is greater than the velocity V(SW,R) ahead of the front (see Fig.
Furthermore, at breakthrough, the cumulative volume of oil produced can be expressed quite simply as the difference between the initial volume of oil AL¢(I- Siw) and the volume currently remaining, AL¢[1 - (Sw)BT], where (Sw)BT is the average water saturation in the porous medium at breakthrough. 35b) Substituting from Eq. 35c) w) dSw s ~ f Combining Eqs. 36b) . f This is Welge's equation 16 for the average water saturation at breakthrough. Note that Eq. 35b) suggests a very simple graphic method for evaluating (Sw)BT.