An investigation of constant-pressure gas well testing influenced by high-velocity flow

Berumen, Sergio; Samaniego, Fernando; Cinco, Heber

doi:10.1016/s0920-4105(97)00014-4

Cited by 6 publications

(5 citation statements)

References 13 publications

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“…Berumen et al 16 have demonstrated that for lowpermeability reservoirs ( k <1md) when the non-Darcy flow does not affect the well test data, a semilog graph of D q / 1 versus D t leads to a straight line having a slope of 1.151 that is the same as the liquid solution slope. This implies that under these specific conditions Eq.…”

Section: Mathematical Developmentmentioning

confidence: 99%

“…(8) can be used to obtain accurate test results. Berumen et al 16 mentioned that the error in calculating the formation conductivity from a constantpressure rate performance test under the influence of highvelocity flow increases with increasing formation permeability. This error may be as high as 13% even when the reservoir permeability has a value of 1 md.…”

Section: Mathematical Developmentmentioning

confidence: 99%

“…To achieve this goal one of the unknown parameters involved in Eq. (16) has to be eliminated from the equation in order to determine the other two. This is done by differentiating Eq.…”

Section: Development Of the Working Equationsmentioning

confidence: 99%

“…Camacho-V 14 presented procedures to determine reservoir parameters from constant-pressure drawdown tests conducted on solution-gas-drive reservoirs. Transient analysis of gas wells producing at constantbottomhole pressure from low-permeability reservoirs have been also discussed in the literature by Berumen et al, 15,16 Vega et al, 17 Camacho et al, 18 and Rangel-German and Samaniego. 19 Transient constant-pressure performance of gas wells depends on fluid and reservoir properties, formation damage or stimulation, wellbore storage, and turbulent flow in the vicinity of the wellbore caused by high velocity production.…”

Section: Introductionmentioning

confidence: 98%

“…Berumen et al 15,16 presented a systematic study of gas well test analysis producing under constant-bottomhole pressure conditions that is similar to the constant-rate solution. They concluded that when the constant-pressure test data is not influenced by formation damage and high-velocity flow effects their results fall within 1% of the actual values.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Mathematical Developmentmentioning

confidence: 99%

Section: Mathematical Developmentmentioning

confidence: 99%

“…To achieve this goal one of the unknown parameters involved in Eq. (16) has to be eliminated from the equation in order to determine the other two. This is done by differentiating Eq.…”

Section: Development Of the Working Equationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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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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A comprehensive analysis of transient rate and rate derivative data of an oil well intercepted by infinite-conductivity hydraulic fracture in closed systems

Malallah,

Nashawi,

Algharaib

2023

J Petrol Explor Prod Technol

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This paper presents a method for analyzing constant-pressure drawdown test of infinite-conductivity fractured wells in bounded reservoirs. The presented method is based on the Tiab direct synthesis approach. The fracture and reservoir parameters are directly determined from the rate and rate derivative of the well test data. New equations describing the elliptical flow regime and the transition from the pseudoradial regime to the boundary-dominated regime of different rectangular reservoirs are also presented. The various flow regimes occurring during the well test are easily identified based on the shape of the plotted data and the slope of each flow regime. The unique features of the slopes of the various regimes and their intersection points are utilized to determine the fracture half-length, formation permeability, skin factor, well drainage area, and reservoir shape factor. Moreover, new equations defining the intersection points of the straight lines corresponding to different flow regimes are presented. These equations are very important for confirming the precision of the calculated results. A systematic process demonstrating the application of the proposed method to linear, elliptical, pseudoradial, and boundary-dominated regimes is well delineated. Comprehensive examples are presented to validate the efficiency of the proposed technique. The examples show that even if some of the flow regimes are not fully developed, the method can still be used to determine the formation and fracture properties using information obtained from the remaining flow regimes. This is one of several advantages of the proposed technique over conventional techniques.

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Well test analysis of finite-conductivity fractured wells producing at constant bottomhole pressure

Nashawi

Malallah

2007

Journal of Petroleum Science and Engineering

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An investigation of constant-pressure gas well testing influenced by high-velocity flow

Cited by 6 publications

References 13 publications

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

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

A comprehensive analysis of transient rate and rate derivative data of an oil well intercepted by infinite-conductivity hydraulic fracture in closed systems

Well test analysis of finite-conductivity fractured wells producing at constant bottomhole pressure

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