Pressure-Transient Analysis for a Well With Multiple Horizontal Sections

Kamal, Medhat M.; Buhidma, Ismail M.; Smith, Steven A.; Jones, W.R.

doi:10.2118/26444-ms

Cited by 34 publications

(22 citation statements)

References 16 publications

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“…Because of the complex deployment method and associated high cost and risk, production logging is seldom run in horizontal wells, and direct measurement of the effective well length is usually unavailable. The well contributing length is directly correlated with the ratio of formation vertical permeability to horizontal permeability and the well skin factor (Kamal et al 1993, Yildiz and Ozkan 1998, and Ozkan 2001. Hence, different combinations of parameters could provide similar results.…”

Section: Uncertainty Of Contributing Well Lengthmentioning

confidence: 99%

Pressure Transient and Production Data Analysis of Horizontal Well in Unconsolidated Formation in Frade, Brazil

Pan

Ewy

Ringe

et al. 2011

SPE Annual Technical Conference and Exhibition

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Frade Asset is a medium-heavy-oil field located in the Northern Campos Basin, approximately 75 miles offshore from Rio de Janeiro, Brazil in 3500 ft water depth. The structure is a low relief anticline with two main fault blocks consisting of four stacked unconsolidated reservoirs. First production started in June 2009, and field development target peak production is 80,000 barrels of crude oil per day. Currently, the field is producing from 9 horizontal oil wells with 3 vertical water injection wells to maintain reservoir pressure. Continuous well monitoring and reservoir characterization is the key to cost-efficient development in this deep-water subsea field. Therefore, most wells in Frade are equipped with permanent down-hole gauges for reservoir surveillance.In this paper, we discuss the impact of three efforts on field performance: 1) monitoring the pressure and production data from horizontal wells since first production, 2) the real-time pressure transient analysis (PTA) of a series of buildup tests, and 3) the transient study combined with long-term production data analysis (PDA). The study results provide insight into formation quality and the change of well conditions with time. The estimations of current drainage area, average reservoir pressure, and original oil in place help to optimize the field development plan. The impacts of pressure-dependent oil properties and rock compaction were also studied, and the first quantitative evaluation of pressure-dependent permeability/porosity reduction was performed using both long-term dynamic well data and laboratory core experiment results. The applications of PTA and PDA in Frade showed that using current advanced technologies properly can yield valuable well and reservoir information from well pressure and rate data.The positive impact of focused efforts to measure and analyze pressure transient and production data, and to use pressuredependent permeability and porosity values in managing a large asset, demonstrated best practices that may be followed in other oil and gas fields.

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Section: Uncertainty Of Contributing Well Lengthmentioning

confidence: 99%

Pressure Transient and Production Data Analysis of Horizontal Well in Unconsolidated Formation in Frade, Brazil

Pan

Ewy

Ringe

et al. 2011

SPE Annual Technical Conference and Exhibition

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“…For this reservoir example, the horizontal permeability perpendicular to the well main trunk k y is higher than the permeability parallel to the main trunk k x . It is known that the horizontal-permeability element that contributes to flow during the vertical radial-flow regime is k y (Kamal et al 1993).…”

Section: Effect Of Multilateral Azimuth Anglementioning

confidence: 99%

Field Applications of a Semianalytical Model of Multilateral Wells in Multilayer Reservoirs

Pan

Kamal

Kikani

2010

SPE Reservoir Evaluation &Amp; Engineering

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Advanced drilling technology has been widely and successfully applied to construct multilateral wells in reservoirs. This paper presents several field applications of a generalized semianalytical segmented model accounting for multilateral-well systems in commingled layered reservoirs. Cases include a heavy-oil field, Al Rayyan oil field offshore Qatar, and Dos Cuadras field offshore California.The model can predict the production performance under either constant-rate or constant-pressure conditions of a well system with any number of arbitrarily oriented laterals of any length and nonuniform formation damage. The reservoir layers, with different porosities, anisotropic permeabilities, and drainage areas, are noncommunicating except through the wellbore. The solution is valid for large reservoirs and when no-flow or constant-pressure boundaries affect the pressure behavior.Results of applying this method in the field cases showed that the model enabled us to predict multilateral-well performance, to obtain information about reservoir connectivity, and to estimate well and reservoir properties in a multilayer system. Uncertainty caused by the large number of unknown parameters in such a complex system represents the main challenge in using this method. It is recommended to use other means together with pressure transient data to reduce the uncertainty.The presented model and the lessons learned from the field applications provide engineers with a tool enabling the use of transient data collected from multilateral wells in multilayer systems for reservoir characterization and performance forecast.

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“…2 However, a multisegment horizontal well model is required in conjunction with the use of conventional method for formulating the nonuniform skin profile. [8][9][10][11][12][13][14][15][16][17][18][19][20] If the segment i along a horizontal well is under the influence of a local skin factor defined as After the incorporation of the scaled segment skin factor into the multisegment horizontal well model, the set of equations are simultaneously solved for flux distribution and pressure losses.…”

Section: Furui Et Al Modelmentioning

confidence: 99%

“…Productivity models for selectively completed or perforated horizontal wells has also been presented in the literature. [9][10][11][12] Pressure transient characteristics of horizontal wells influenced by formation damage have been studied by many researchers since the mid 1980s. 1,[9][10][11][12][13] Goode and Thambynayagam 1 were among the first to incorporate the effect of uniform skin factor into the transient pressure solutions for horizontal wells.…”

Section: Introductionmentioning

confidence: 99%

“…[9][10][11][12] Pressure transient characteristics of horizontal wells influenced by formation damage have been studied by many researchers since the mid 1980s. 1,[9][10][11][12][13] Goode and Thambynayagam 1 were among the first to incorporate the effect of uniform skin factor into the transient pressure solutions for horizontal wells. Later, researchers [8][9][10][11][12][13][14][15][16][17][18][19][20] have developed models that can handle nonuniform skin distribution as well as selective completion along horizontal wells.…”

Section: Introductionmentioning

confidence: 99%

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Equivalent Skin Factors for Nonuniformly Damaged Horizontal and Multilateral Wells

Yildiz

2008

SPE Annual Technical Conference and Exhibition

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In the first part of this study, we scrutinize the equivalent skin concept used to emulate the influence of uneven formation damage on the performance of horizontal wells. Rigorous 3D multisegment well models are used to simulate the local changes due to nonuniform formation damage around wellbore accurately. We show that the simple models, presented in the literature, to compute equivalent skin factors are quite limited in their accuracy.Equivalent skin factor resulting from nonuniform formation damage around a horizontal well, in general, is influenced not only by the static damage distribution itself but also by many reservoir and wellbore variables. A convoluted interaction of well location, distance to reservoir boundaries, reservoir boundary type, formation thickness, well length, extent and nature of static formation damage itself, production time, and the contrast between the flux distributions around damaged and undamaged wells affects and controls the equivalent skin factor around horizontal wells.In the second part of the study, we investigate the uneven formation damage around multilateral wells. Our investigation concludes that, as far as the equivalent skin factor values are concerned, the multilateral cannot be represented as an extension of horizontal wells. The interaction between the laterals affects the flux distribution around the laterals which in turn influences equivalent skin factors. Commingled production from duallateral systems changes the nature and size of equivalent skin in comparison with equivalent skin factors resulting from individual and separate productions from each lateral. In a duallateral system, the contrast in the individual lateral lengths may have a strong impact on the equivalent skin factors for both laterals.

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Pressure-Transient Analysis for a Well With Multiple Horizontal Sections

Abstract: pressure transient data to obtain more realistic well and reservoir parameters.

Cited by 34 publications

References 16 publications

Pressure Transient and Production Data Analysis of Horizontal Well in Unconsolidated Formation in Frade, Brazil

Pressure Transient and Production Data Analysis of Horizontal Well in Unconsolidated Formation in Frade, Brazil

Field Applications of a Semianalytical Model of Multilateral Wells in Multilayer Reservoirs

Equivalent Skin Factors for Nonuniformly Damaged Horizontal and Multilateral Wells

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