In"this paper, some standard geometrical flood patterns of "n-spot" are compared with each other on the basis of their respective susceptibility to the balance between total fluid injection and withdrawal rates by use of a basic parameter, Fm− the ratio between the average PI of production wells and the injectivity index of injection wells. The characteristic parameter. Fm, of a reservoir basically is dominated by the reservoir rock and fluid property as well as by completion practices.

Each pattern of well networks deserves preference under certain specific circumstances. All factors other than Fm being equal, the five-spot network offers greater total liquid deliverability when Fm lies within the range 1 to 1.5. When Fm is smaller than 0.5, the inverted nine-spot network begins to show its superiority.

Formulas and graphs showing relationships between n and Fm are presented for comparison and selection of optimal patterns for different circumstances.

Keywords:
total number, well network, pattern-type well network, relative number, production well, injector, superiority, well pattern, enhanced recovery, waterflooding
Subjects:
Improved and Enhanced Recovery, Waterflooding
Copyright 1983, Society of Petroleum Engineers
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