Some Analytical Principles Covering Oil Recovery by Forced Drive
- Stanley C. Herold (Petroleum Geologist, Stanford University)
- Document ID
- Society of Petroleum Engineers
- Transactions of the AIME
- Publication Date
- December 1926
- Document Type
- Journal Paper
- 218 - 218
- 1926. Original copyright American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc. Copyright has expired.
- 5.1.1 Exploration, Development, Structural Geology, 2.4.3 Sand/Solids Control
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This paper covers "an ideal situation with a formation horizontal,uniform thickness of sand, perfectly homogeneous texture and containing oilwith gas in solution with no water, throughout a definite, although undefined,lateral extent," and outlines fully an analytical method covering each ofthe following problems: Ideal drainage area, application of forced drive toexhausted wells, recovery of oil from an elliptical area, the systems offlooding in common use as applied to such area, and the method of determiningthe area of the elliptical non-drained space, and the application of this tothe determination of whether it is less costly to space wells closely or applygreater pressure.
J. B. Umpleby, Oklahoma City, Okla. (written discussion).Mr. Herold?sanalysis of principles concerning oil recovery by forced drive is timely andthe conclusions follow logically from the premises taken. I doubt, however, ifthe method of elliptical areas can be applied in fields that have alreadyyielded a large amount of oil. The method seems to imply a saturated reservoirrock, the result of pressure being to develop stress in the fluid withoutbodily movement except as localized by producing wells. Under these conditionsthere will be undrained areas as indicated in his Fig. 4. Will the same area beundrained if saturation is incomplete? It is at this point where pressures fromopposite directions first meet, causing a pressure gradient outward toward anoil well in staggered position. The amount of oil leaving this area will dependon the steepness of the pressure gradient, the porosity, and the time elapsingbefore fluid saturation is reached in the triangle between wells. When thereservoir rock between first and second-line wells becomes saturated, movementwill doubtless he in elliptical areas but observations at Bradford lead me tobelieve that more than half the total migration of oil in any particular areatakes place before it becomes fully saturated.
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