Question

Select the CORRECT statements for the injection-production well pattern.

• A. Inverted 5-spot drive includes four injectors at the corners and the producer at the centre.
• B. Regular 7-spot drive includes six injectors at the corners and the producer at the centre.
• C. Staggered-line drive involves staggered injectors and producers.
• D. Crestal injection involves positioning of the wells along the periphery of the reservoir.

Hint:

7-spot patterns provide uniform sweep around a central producer, while staggered-line patterns enhance areal coverage.

Answer 1

The Correct Option is B, C

Injection-production well patterns are used to optimize displacement efficiency in reservoirs.
Option (A) is incorrect because an inverted 5-spot drive has one injector at the centre and four producers at the corners, not the other way around.
Option (B) is correct since a regular 7-spot pattern consists of six injectors arranged hexagonally around a central producer.
Option (C) is also correct because staggered-line drive places injectors and producers alternatively in staggered rows for better sweep.
Option (D) is incorrect since crestal injection places wells near the reservoir crest, not at the periphery.
Therefore, the correct statements are (B) and (C).