A Modified Blasingame Production Analysis Method for Vertical Wells Considering the Quadratic Gradient Term

Junjie Ren, Qiao Zheng and Chunlan Zhao
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Junjie Ren: School of Sciences, Southwest Petroleum University, Chengdu 610500, Sichuan, China
Qiao Zheng: School of Sciences, Southwest Petroleum University, Chengdu 610500, Sichuan, China
Chunlan Zhao: School of Sciences, Southwest Petroleum University, Chengdu 610500, Sichuan, China

Energies, 2019, vol. 12, issue 11, 1-33

Abstract: Fluid flow in actual oil reservoirs is consistent with material balance, which should be described by the nonlinear governing equation, including the quadratic gradient term (QGT). Nonetheless, the widely-used Blasingame production decline analysis (BPDA) is established based on the conventional governing equation neglecting the QGT, which leads to some errors in the interpretation of production data under some conditions, such as wells producing at a large drawdown pressure. This work extends BPDA to incorporate the effect of the QGT by modifying material balance time and normalized rate functions. The step-by-step procedure for the proposed production decline analysis (PPDA) is presented and compared with that for BPDA. The simulated cases for various production scenarios are used to validate PPDA. A field case is employed to show the applicability of PPDA in practice. Comparisons between the results obtained by BPDA and PPDA are analyzed in detail. It is found that BPDA overestimates the permeability and original oil-in-place, while PPDA works well. Compared with BPDA, PPDA can be employed to obtain more accurate original oil-in-place and reservoir properties, especially when wells produce at a large drawdown pressure.

Keywords: production decline analysis; oil reservoir; material balance; quadratic gradient term; Blasingame type curve (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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