Improved Estimation of Gas Well Deliverability from Single-Point Tests

Chase, R.W.

doi:10.2118/2000-012

Cited by 3 publications

(3 citation statements)

References 4 publications

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“…Note that Chase et al 9,10 showed that using the dimensionless IPR method produced more accurate deliverability forecasts than those obtained by simply using equation (1) with the assumption that the exponent, n, was equal to one.…”

Section: Discussion Of Simulated Well Resultsmentioning

confidence: 99%

“…Using Joshi's Equation given by: ………………. (9) where, …………….. (10) and Russell and Truitt's Equation given by: r w´ = 0.37 X f ..……………………..……………..………. (11) the following new relationship was derived:…”

Section: Methodsmentioning

confidence: 99%

“…The original M and N data as a function of X e /X f were therefore re-fitted with linear equations given by equations (6) and (7), respectively, for values of X e /X f greater than or equal to 1x10 8 . log(M) = 0.057871 log (X e /X f ) + 0.311663……….…..….. (6) log(N) = -0.002712 log (X e /X f ) + 0.159624...…………..... (7) Chase et al 9,10 showed that the IPR curve resulting from the model could be further utilized to predict the coefficient and exponent of equation (1) or the coefficients of the Jones, Blount, and Glaze 11 equation (also referred to as Houpert's equation or the LIT equation). They also demonstrated that far more accurate predictions of gas well inflow performance were obtained using the dimensionless IPR model and singlepoint test data than when equation (1) was used assuming that the exponent, n, was equal to one.…”

Section: Introductionmentioning

confidence: 99%

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Predicting Horizontal Gas Well Deliverability Using Dimensionless IPR Curves

Chase¹,

Steffy²

2004

Proceedings of SPE Eastern Regional Meeting

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A dimensionless inflow performance relationship (IPR) model, similar to Vogel's method, developed by Chase and Alkandari to predict the deliverability of an hydraulically fractured vertical gas well, has been modified to predict the performance of horizontal gas wells. An equation given in terms of the X e /X f ratio was derived by combining equations offered by Joshi and by Russel and Truitt. Twenty wells were simulated and the IPR curves generated were compared to those obtained using the modified dimensionless IPR model. The average error between the IPR curves generated using the new model and the simulator was 11.1%. When just the absolute open flows were compared, there was an average error of only 3.34%. Reservoir rock and fluid data and modified isochronal test were obtained on a real horizontal well. The IPR curve generated from a conventional modified isochronal analysis and that generated from the new model were compared. The AOFs were within 2.1% of each other, and the average error between the two curves was approximately 4%. The dimensionless IPR curve model appears to offer a cost-effective way of predicting horizontal gas well deliverability.

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Section: Discussion Of Simulated Well Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Predicting Horizontal Gas Well Deliverability Using Dimensionless IPR Curves

Chase¹,

Steffy²

2004

Proceedings of SPE Eastern Regional Meeting

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The Role of Flow Measurement in Hydrocarbon Recovery Forecasting in the Ukcs

et al. 2019

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Dimensionless Inflow-Performance-Relationship Curve for Unfractured Horizontal Gas Wells

Billiter¹,

Lee

Chase

2001

SPE Eastern Regional Meeting

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A dimensionless inflow performance relationship (IPR) curve that is a function of horizontal permeability, average reservoir pressure, reservoir height, and reservoir drainage area has been developed for unfractured, horizontal gas wells. The Babu and Odeh horizontal oil well flow equations were modified to account for non-Darcy flow effects and mechanical skin effects and also transformed into pseudopressure form. The pseudopressure equations were solved using analytical methods and Monte Carlo simulation to yield dimensionless IPR curves. This effort showed that the proposed dimensionless IPR curve for unfractured, horizontal gas wells in pseudosteady-state flow is basically independent of all variables except horizontal permeability, average reservoir pressure, reservoir height, and reservoir drainage area. The proposed dimensionless IPR curve is similar in form to the familiar Vogel equation, but only has one coefficient, which is a function of horizontal permeability, average reservoir pressure, reservoir height, and reservoir drainage area. The proposed dimensionless IPR curve can be used to predict the deliverability of a horizontal gas well using a single-point test, as opposed to a standard four-point deliverability test, if the height of the reservoir is known. Introduction Deliverability testing refers to the testing of a gas well to measure its production capabilities at a given stage of reservoir depletion. Deliverability testing commonly yields a reservoir inflow performance relationship (IPR) curve. An IPR curve relates production rate to flowing bottomhole pressure for a given average reservoir pressure, the reservoir pressure at which the deliverability testing was performed. It is mainly used to predict current gas-well deliverability given a fixed backpressure. Traditionally, deliverability testing of a gas well is accomplished using a four-point backpressure test, an isochronal test, or a modified isochronal test. All of these methods require testing a well at a minimum of four flow rates. These multi-point tests all yield very reliable results but are very expensive in terms of manpower and testing equipment. A method that can predict current gas well deliverability using only a single-point flowrate test is thus desirable. Previous Studies Vogel1 introduced the concept of dimensionless inflow performance relationship curves. As defined by Vogel, an IPR curve is made dimensionless by dividing the pressure for each point on the IPR curve by the maximum pressure for that particular curve and by dividing the corresponding production rate by the maximum producing rate for the same curve. Because it correlates q/qmax with pwf/p, a dimensionless IPR curve can be used to predict well performance. Vogel proposed his now famous inflow equation for solution-gas drive, oil wells: Equation (1)

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Improved Estimation of Gas Well Deliverability from Single-Point Tests

Cited by 3 publications

References 4 publications

Predicting Horizontal Gas Well Deliverability Using Dimensionless IPR Curves

Predicting Horizontal Gas Well Deliverability Using Dimensionless IPR Curves

The Role of Flow Measurement in Hydrocarbon Recovery Forecasting in the Ukcs

Dimensionless Inflow-Performance-Relationship Curve for Unfractured Horizontal Gas Wells

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