Question

The ratio of number of production to injection wells for a regular Seven-Spot pattern is ........... (rounded off to one decimal place).

Hint:

In typical enhanced oil recovery patterns, such as Seven-Spot, the number of production wells is designed to be higher than the injection wells to ensure the effective sweep of injected fluids across the reservoir.

Answer 1

In reservoir engineering, the well pattern configuration is crucial for understanding how fluid will be injected and produced from the reservoir. One common pattern used for enhanced oil recovery is the Seven-Spot pattern, which is a part of a larger injection-production system.
A Seven-Spot pattern consists of one injection well surrounded by six production wells. These wells are arranged in a pattern that maximizes the area of oil swept by the injected fluid. The basic layout for a regular Seven-Spot pattern is as follows:
- 1 injection well at the center
- 6 production wells surrounding the injection well
Thus, in this pattern, the number of production wells is always 6, and the number of injection wells is 1.
The ratio of production to injection wells is simply the number of production wells divided by the number of injection wells. Using this information, we can calculate:
\[ {Ratio} = \frac{{Number of Production Wells}}{{Number of Injection Wells}} = \frac{6}{1} = 6 \] Thus, the ratio of production to injection wells in a Seven-Spot pattern is \( \boxed{6.0} \).
This simple calculation is useful for understanding well spacing, the effectiveness of injection programs, and reservoir management strategies in enhanced oil recovery projects.