Positioning of the tubing string in a steam injection well

Details Positioning of the tubing string in a steam injection well Positioning of the tubing string in a steam injection well

E - Fixed Constructions

21

B

E21B 43/24 (2006.01)

Patent

CA 2313837

A steam-assisted gravity drainage process, involving a co-operating pair of closely spaced, horizontal steam injection and liquid production wells, is modified as follows: .cndot. during the initial circulation phase, the tubing string is landed at the toe of the injection well; and .cndot. during the following injection phase, the tubing string is landed at the heel or intermediate the heel and toe. It has been found that steam preferentially leaks into the reservoir at heel and toe due to pressure drop arising from friction effects through the annulus, between the tubing string and screened liner. So the steam delivery point through the tubing string during the circulation phase is located at the toe, but it is retracted to the heel or to between heel and toe for the injection phase, to shorten the annulus and thereby lessen the pressure drop.

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