Reservoir Fracturing - A Method of Oil Recovery From Extremely Low Permeability Formations
- L.E. Wilsey (Stanolind Oil and Gas Co.) | W.G. Bearden (Stanolind Oil and Gas Co.)
- Document ID
- Society of Petroleum Engineers
- Journal of Petroleum Technology
- Publication Date
- August 1954
- Document Type
- Journal Paper
- 21 - 27
- 1954. Original copyright American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc. Copyright has expired.
- 4.3.4 Scale, 2.4.3 Sand/Solids Control, 1.6 Drilling Operations, 5.7.2 Recovery Factors, 5.1.2 Faults and Fracture Characterisation, 1.2.3 Rock properties, 5.2 Reservoir Fluid Dynamics, 4.1.5 Processing Equipment, 1.1.6 Hole Openers & Under-reamers, 2.5.2 Fracturing Materials (Fluids, Proppant), 4.1.2 Separation and Treating, 3.2.3 Hydraulic Fracturing Design, Implementation and Optimisation, 3.2.4 Acidising, 3 Production and Well Operations
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This paper presents results of analysis of the effect of fracturing on initial flow rates and on ultimate recoveries from low capacity oil formations. This analysis shows that even in formations of permeability as low as 0.1 md, large fracture treatments can yield oil recoveries and production rates approaching those of high permeability formations. Field production information is shown which supports the analytical work.
Often hydrocarbon bearing formations are discovered which, while they are known to contain large quantities of oil, will not produce at commercially attractive rates without special well stimulation. Attempts to solve this problem led to the development of such techniques as underreaming, shooting, acidizing, and recently hydraulic fracturing. These methods of stimulation have been highly successful in many fields. All of these treatments, however, affect only the pay section near the well bore and therefore owe their success to circumventing and overcoming local permeability reduction about the well bore.
It has been the belief that in treating wells to stimulate production in which there is no permeability reduction near the well, the maximum possible production rate increase would be of the order of two or fourfold. Hence, it has been concluded that fracture treatment of uniformly low capacity (permeability times thickness) formations could meet with but limited success.
It is the purpose of this paper to show that the use of fracture treatments much larger than usually used can yield commercially attractive producing rates and high recoveries even in formations of permeability less than 0.1 of a md.
In order to illustrate the effects of fracturing, an analytical study of some hypothetical systems was made in which one factor at a time was varied to show what is important in recovering oil from fractured wells.
|File Size||535 KB||Number of Pages||7|