Steady-state flow capacity of wells with limited entry to flow
The paper analyzes the effect of limited entry to flow at the well bore on the steady-state productivity of a well. Wells which have been opened to flow along a fraction of their productive interval are termed wells with limited entry. Previous work treated the cases of a partially penetrating well, a well producing from the central portion of the productive interval, and a well in which several intervals equally spaced are open to flow. In this paper the open interval can be located anywhere within the productive interval. Thus, in a sense, it generalizes previous work. The finite cosine transform was used to arrive at a solution for stady-state flow of slightly compressible fluid. The solution was programmed for a CDC 1604. Numerical values for rDeU = 660, rDwU = 1/4, and range of sand thickness of 20 to 200 ft, are presented in graphical form. The effect of rDeU and rDwU values on the result in shown in a table. The correct calculation of skin and damage ratio in the presence of limited entry to flow is explained and illustrated by examples. Moreover, the paper shows how to calculate the net decrease in productivity due to the combined effect of limited entry and perforations.
- OSTI ID:
- 6302348
- Resource Relation:
- Conference: 42. annual SPE of AIME fall meeting, Houston, TX, USA, 1 Oct 1967; Related Information: SPE-1797
- Country of Publication:
- United States
- Language:
- English
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