Pressure Prediction for Oil Reservoirs
- W.A. Bruce (The Carter Oil Co.)
- Document ID
- Society of Petroleum Engineers
- Transactions of the AIME
- Publication Date
- December 1943
- Document Type
- Journal Paper
- 73 - 85
- 1943. Original copyright American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc. Copyright has expired.
- 5.5 Reservoir Simulation
- 3 in the last 30 days
- 348 since 2007
- Show more detail
- View rights & permissions
This paper presents the essentials of a mathematical method of studying thepressure beha vior of an oil reservoir as the fluids are withdrawn. Methods areshown whereby the behavior of a reservoir can be used to predict the futurerelationship between withdrawals and pressure. The oil reservoir is consideredas a small part of a large porous continuum, which contains for the most partwater. The expansion of this water resulting from a decrease of pressure in theoil zone causes a movement of water that is an important factor in therelationship between fluid withdrawals and reservoir pressure. Examples aregiven to illustrate the methods of pressure prediction for a circular reservoircontaining undersaturated crude, the
pressure distribution over a field that has a uniform production rate, theeffect of a fault line near a field, the mutual interference of near-by fields,and the perturbing influence of a gas cap. Applications of the analysis towell-spacing problems are shown.
The pressure-prediction methods to be described here are based upon theconception of an oil pool as a small part of a large porous continuum,containing for the most part water. The formation containing this water may bethought of as extending over an area of many square miles and having one ormore small bodies of oil or gas trapped in high spots or reservoirs. It will betreated as having the general aspect of a thin, flat sheet with an over-alltilt to the horizontal and with numerous small high spots, tight zones, andirregularities. This porous continuum will be treated as being much moreextensive than the oil or gas zones, but will be recognized as terminating atsuch large boundaries as a general fault, outcrop, unconformity, orpinch-out.
Throughout the greater part of this limited porous continuum it is likelythat there is a hydraulic connection. If this is true, the removal of fluid inone place will cause a disturbance that eventually will travel to all parts ofthe continuum.
This picture has led to the recognition of water as the major fluid in theporous continuum and in many cases the expansive nature of this water as themain driving force producing the oil. The next step is the solution of thegeneral problem of compressible liquid behavior in porous media.
|File Size||915 KB||Number of Pages||13|