Research Papers: Natural Gas Technology

Density-Based Decline Performance Analysis of Natural Gas Reservoirs Using a Universal Type Curve

[+] Author and Article Information
Peng Ye

John and Willie Leone Family
Department of Energy and Mineral
Engineering and EMS Energy Institute,
The Pennsylvania State University,
University Park, PA 16802

Contributed by the Petroleum Division of ASME for publication in the Journal of Energy Resources Technology. Manuscript received November 27, 2012; final manuscript received February 23, 2013; published online May 31, 2013. Assoc. Editor: Hong-Quan (Holden) Zhang.

J. Energy Resour. Technol 135(4), 042701 (Jul 02, 2013) (10 pages) Paper No: JERT-12-1268; doi: 10.1115/1.4023867 History: Received November 27, 2012; Revised February 23, 2013

Modern natural gas reservoir decline performance analysis has traditionally relied on the use of oil type curves along with the concepts of pseudopressure and pseudotime. Alternatively, it also employs empirical curve fitting of rate-time production data for reserve and future performance analysis. In this work we show that the use of a density approach leads to the formulation of a new-generation type curve applicable to the analysis of unsteady state of natural gas wells under boundary dominated flow (BDF). The resulting gas reservoir decline equation applies to any gas well producing at constant bottomhole pressure under BDF. On the basis of this decline model, a single-line, universal type curve is derived for any gas fluid and reservoir properties producing under a constant drawdown condition. New-generation analytical procedures for gas well performance analysis are presented, which does not necessitate the calculation of pseudopressure or pseudotime. Explicit OGIP predictions are thus enabled from the proposed universal type curve matching. The proposed single-line type curve is demonstrated to successfully match rate-time production BDF data and reliably estimate fluids in place for a number of numerical simulations and field cases. It is also demonstrated that the proposed formulation can be alternatively implemented in terms of straight-line analysis of 1/qgscb versus time data plots.

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Grahic Jump Location
Fig. 1

(a) Natural gas viscosity-compressibility versus density behavior (SG = 0.55, 100 < p < 5000 psia, at T = 200 F). (b) Transient decline exponent (b) for a gas well (B¯ = 1) under different rρ.

Grahic Jump Location
Fig. 2

A universal type curve for BDF analysis of gas well decline

Grahic Jump Location
Fig. 3

Straight-line analysis of 1/qgscb versus time BDF data

Grahic Jump Location
Fig. 5

Straight-line analysis of 1/qgscb versus time for case study I

Grahic Jump Location
Fig. 6

Type-curve match against universal BDF stem for case study II

Grahic Jump Location
Fig. 7

Straight-line analysis of 1/qgscb versus time for case study II

Grahic Jump Location
Fig. 8

Type-curve match against universal BDF stem for case study III

Grahic Jump Location
Fig. 9

Straight-line analysis of 1/qgscb versus time for case study III

Grahic Jump Location
Fig. 10

Type-curve match against universal BDF stem for case study IV

Grahic Jump Location
Fig. 11

Straight-line analysis of 1/qgscb versus time for case study IV




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