Well-Test Analysis for Solution-Gas-Drive Reservoirs: Part 3—A Unified Treatment of the Pressure-Squared Method

Serra, Kelsen V.; Peres, Alvaro M.M.; Reynolds, Albert C.

doi:10.2118/18110-pa

Cited by 9 publications

(4 citation statements)

References 21 publications

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“…However, a different slope, w, is observed during the CWP decline period than at the bubble point. This has also been observed by Serra et al 15 in their work with the pressure-squared method.…”

Section: Application To Synthetic Datasupporting

confidence: 78%

Maximizing the Potential of Decline Curve Analysis

Aitokhuehi¹

2007

Proceedings of Nigeria Annual International Conference and Exhibition

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fax 01-972-952-9435. AbstractThe data most collected within the oil industry is the rate-time data. This data is analyzed with decline curve to primarily determine well/reservoir remaining reserves. However, rate-time data, which is a form of extended well testing, can also be used to estimate other reservoir parameters such as permeability and/or relative permeability curve.In this paper, we utilized Masoner's decline derivation to show that estimates of the relative permeability curve can be obtained from a well under voidage rate control in a solution gas drive system. For a well under pressure control in a solution gas drive reservoir, however, we show that the decline is exponential and obtain an expression for the permeability. The results were applied to data from solution gas drive simulation models and are presented. Application to field data is also presented.

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Section: Application To Synthetic Datasupporting

confidence: 78%

Maximizing the Potential of Decline Curve Analysis

Aitokhuehi¹

2007

Proceedings of Nigeria Annual International Conference and Exhibition

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“…24 and 25 will usually underestimate kk roi and s, respectively. 17,18 Fig. 5 compares the sandface value of So obtained from the simulator as a function of time with the So value obtained by solving Eq.…”

Section: Simulator Datamentioning

confidence: 99%

“…8 by assuming that all variables are functions of the Boltzmann variable, which is defined asz=r2It . ........................................ (18). and that So is a function of p. The right side of Eq.…”

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confidence: 97%

Well-Test Analysis for Solution-Gas-Drive Reservoirs: Part 1—Determination of Relative and Absolute Permeabilities

Serra

Peres

Reynolds

1990

SPE Formation Evaluation

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For transient radial flow to a well producing a solution-gas-drive reservoir, it is shown that estimates of effective phase permeabilities as functions of pressure can be obtained directly from the measured flowing wellbore pressure and the flow rates. Rough estimates of effective permeabilities as functions of oil saturation also can be obtained. It is also shown that a semilog plot of pressure squared vs. time can be used to estimate effective permeabilities and the skin factor.

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“…Even though the Perrine approach is used in this work, it is worth to say that there exist more rigorous methods provided in the literature for analyzing multi-phase fl ow without requiring the knowledge of the permeability curves. The reader should refer to Al-Khalifah, A-J.A., Aziz and Horne (1987) and Serra, Peres and Reynolds (1990) for further information.…”

Section: Introductionmentioning

confidence: 99%

Application of TDS Technique to Multiphase Flow

Escobar

Montealegre-M.

2008

CT&F Cienc. Tecnol. Futuro

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Although, the radial difussivitity equation has been solved for a single-fluid phase flow, in some cases more than one phase flows from the reservoir to the well; therefore, the single-phase solution has been previously extended to multiphase flow without losing a significant degree of accuracy. Practically, there exist two ways of dealing with multiphase flow: The Perrine method, Perrine (1956) which basically replaces the single-phase compressibility by the multiphase compressibility so that each fluid is analyzed separately using the concept of mobility. The other one is the use of pseudofunctions which have been found to be the best option. The TDS technique has been widely applied to a variety of scenarios. It has been even tested to successfully work on condensate systems with the use of pseudofunctions, Jokhio, Tiab and Escobar (2002). However, equations for estimation of phase permeability, skin factor and drainage area has not neither presented nor tested. In this article, we present new versions of a set of equations of the TDS technique to be applied to multiphase flow following the Perrine method along with a previously presented way of estimation of the absolute relative permeability. We successfully applied the proposed equations to synthetic and field examples.

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Well-Test Analysis for Solution-Gas-Drive Reservoirs: Part 3—A Unified Treatment of the Pressure-Squared Method

Cited by 9 publications

References 21 publications

Maximizing the Potential of Decline Curve Analysis

Maximizing the Potential of Decline Curve Analysis

Well-Test Analysis for Solution-Gas-Drive Reservoirs: Part 1—Determination of Relative and Absolute Permeabilities

Application of TDS Technique to Multiphase Flow

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