Constant-Pressure Production in Solution-Gas-Drive Reservoirs: Transient Flow

Camacho-V., Rodolfo

doi:10.2118/17118-pa

Cited by 13 publications

(5 citation statements)

References 19 publications

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“…The same result is also true for constant-wellborepressure production for the boundary-dominated flow (Eq. 36) and during the transient flow period, as reported by Camacho-V. 8 Fig where Np and G p =cumulative oil and gas productions, respective-Iy. Note that the system of equations 63 and 64 is independent of relative penneability data; also these equations are valid for all times.…”

Section: ¢Ad CImentioning

confidence: 82%

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Boundary-Dominated Flow in Solutions-Gas-Drive Reservoirs

Camacho-V.

Raghavan

1989

SPE Reservoir Engineering

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The performance of wells in solution-gas-drive reservoirs during the boundary-dominated flow period is examined. Both constant-wellbore-pressure and constant-oil-rate production modes in closed systems are considered. For the constant-wellbore-pressure production mode, Arps' performance-prediction equations are examined, and predictions of future performance are shown to be strong functions of well spacing, well condition, and fluid properties. The parameters b (the decline exponent) and d i (the initial decline rate) in the Arps equations are expressed in terms of physical properties. The conditions under which these equations can be used are specified. An empirical procedure to predict production rates is also presented. In the case of constant-oil-rate production, an expression to correlate the pressare distribution in the reservoir is presented. The correlating function permits us to extend the definition of pseudosteady-state flow to solution-gas-drive systems. Its use also allows the simultaneous computation of average properties (pressure and saturation) during boundary-dominated flow from wellbore information. 'Now at Inst. Mexicano del Petr6leo. "Now at Texas A&M U.

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Section: ¢Ad CImentioning

confidence: 82%

“…The development for transient flow given in Ref. 8 is used to provide a theoretical justification for this observation. An empirical procedure to predict production rates of wells produced at a constant pressure over short time spans is also presented.…”

Section: Introductionmentioning

confidence: 98%

Boundary-Dominated Flow in Solutions-Gas-Drive Reservoirs

Camacho-V.

Raghavan

1989

SPE Reservoir Engineering

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“…(14) for the analysis of constant-pressure drawdown test data of gas wells under the effects of highvelocity flow and formation damage. The various factors that have dominant impact on the proposed plot of )…”

Section: Validation Of the Proposed Plotmentioning

confidence: 99%

“…However, the minor error resulted from the most severe case ( k = 5 md) remains within practical engineering applications, which permits one to safely conclude that the proposed plot obtained from Eq. (14) can be adequately used to analyze constant-pressure rateperformance test.…”

Section: Effect Of Reservoir Permeability High-velocity Flow and Fomentioning

confidence: 99%

An Investigation of Gas Well Testing Under Constant-Bottomhole Pressure Conditions, High-Velocity Flow Effects, and Formation Damage

et al. 2003

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractThis paper presents an investigation of the validity of applying the constant-pressure liquid solution to transient ratedecline analysis of gas wells. Pseudo-pressure, non-Darcy flow effects, and formation damage are incorporated in the liquid solution to simulate actual real gas flow in the vicinity of the wellbore. The study shows that for constant-bottomhole pressure gas production the conventional semilog plot of the inverse of the dimensionless rate versus the dimensionless time used for liquid solution has to be modified to consider the high-velocity flow effects. This is especially true when the reservoir permeability is higher than 1 md and the well test is affected by non-Darcy flow and formation damage. This paper also presents a novel systematic method to determine the formation permeability, mechanical skin factor, and non-Darcy flow coefficient from a single constantpressure production test. The working equations are written in such a way that allows a graphical analysis of the variable rate with time that is analogous to the analysis of constant-rate production test. The analysis procedure is simple and straightforward. It does not require type-curve matching or correlations. The applicability of the proposed method is illustrated using several simulated examples. The input formation permeability varies from a low value of 0.1 md to a high value of 5 md. The ratio of the downhole pressure to the initial reservoir pressure ranges from 0.1 to 0.8.

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“…[9][10][11][12][13] In general, the main feature that makes the interpretation of gas well tests more difficult to analyze than their counterpart of oil wells is the presence of non-Darcy effects due to high-velocity flow around the wellbore. 14,15 If not properly recognized, these effects may mask the presence of a fracture in the vicinity of the wellbore.…”

Section: Introductionmentioning

confidence: 99%

Gas Well Decline Analysis Under Constant-Pressure Conditions, Wellbore Storage, Damage, and Non-Darcy Flow Effects

et al. 2002

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractThis paper presents a simple and accurate method to determine all the reservoir parameters for transient constantpressure drawdown data of gas wells influenced by wellbore storage, formation damage, and high-velocity flow effects. The working equations are written in such a way that allows a graphical analysis of the measured variable rate with time that is very much similar to the analysis of constant-rate production case. No iterative procedure, multi-rate test, nor non-linear regression is necessitated to determine the formation damage and the non-Darcy flow effects. The well test data analysis requires two plots to directly obtain all the parameters of interest. The formation permeability and the non-Darcy flow coefficient are obtained from the first plot, whereas the skin factor is obtained from the second analysis plot.This work systematically illustrates the applicability of the derived equations using several simulated examples. The final working equations are written in various forms, which allows the well test analyst to select the form that is most convenient for his application. The advantages of the proposed method are clearly shown when the analysis procedure and results are compared to other analysis techniques.

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Constant-Pressure Production in Solution-Gas-Drive Reservoirs: Transient Flow

Cited by 13 publications

References 19 publications

Boundary-Dominated Flow in Solutions-Gas-Drive Reservoirs

Boundary-Dominated Flow in Solutions-Gas-Drive Reservoirs

An Investigation of Gas Well Testing Under Constant-Bottomhole Pressure Conditions, High-Velocity Flow Effects, and Formation Damage

Gas Well Decline Analysis Under Constant-Pressure Conditions, Wellbore Storage, Damage, and Non-Darcy Flow Effects

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