Transient Dual-Porosity Behavior for Horizontal Wells Draining Heterogeneous Reservoirs

Verga, F.M.; Beretta, E.; Albani, D.

doi:10.2523/68844-ms

Cited by 4 publications

(2 citation statements)

References 11 publications

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“…Several authors 8,9 have demonstrated that in a multilayered reservoir, where a high permeability layer is supported by a tight zone, the pressure response can exhibit a transient dual-porosity behavior. Bilinear flow exists in a horizontal well when it is positioned in a high permeability layer overlying (or underlying) a relatively low permeability layer, resulting in two linear flows: a linear horizontal flow in the most permeable zone and linear vertical flow in the tight zone ( Figure 6).…”

Section: Bilinear Flow (Well A)mentioning

confidence: 99%

Horizontal Wells Pressure Build Up Analysis in Orinoco Heavy Oil Belt

Briceno¹,

L.E.²,

Quijada³

2002

Proceedings of SPE International Thermal Operations and Heavy Oil Symposium and International Horizontal Well Technology Confer

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Section: Bilinear Flow (Well A)mentioning

confidence: 99%

Horizontal Wells Pressure Build Up Analysis in Orinoco Heavy Oil Belt

Briceno¹,

L.E.²,

Quijada³

2002

Proceedings of SPE International Thermal Operations and Heavy Oil Symposium and International Horizontal Well Technology Confer

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“…If the dual-porosity transition occurs when the linear flow regime is the dominant flow regime and for some values of storativity ratio, the pressure derivative of the transient pressure response exhibits an intermediate line of quarter slope. [17][18][19][20] …”

Section: Introductionmentioning

confidence: 99%

Transient Dual Porosity Behavior for Horizontal Wells: Case Histories

Verga¹,

Beretta²

2001

Proceedings of SPE Annual Technical Conference and Exhibition

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractOccurrence of bilinear flow regime in various geological situations has been discussed rather extensively in the literature. In particular, it was theoretically demonstrated that the bilinear flow regime can arise in the case of horizontal wells draining fractured reservoirs due to transient dual porosity behavior originating during the intermediate linear flow period. The bilinear flow regime can be identified by analysis of the well transient pressure response as the pressure derivative exhibits the characteristic quarter slope on the loglog diagnostic plot. However, the duration of the transient dual porosity behavior depends on the system geometry, namely location and length of the horizontal well and thickness of the producing layer, and on the permeability contrast which reportedly exists between the more conductive fractures and the feeding matrix. Three interesting case histories are presented in this paper where the pressure derivative response for horizontal wells drilled in different fractured reservoirs indicated the occurrence of the transient dual porosity behavior before that the linear flow, which is typical of horizontal wells in homogeneous reservoirs, was achieved. In agreement with the geological surveys it was interpreted that the bilinear flow was caused by two intersecting fracture systems showing a strong permeability contrast whereas the feeding action of the matrix, if any, could only be detected at a later time. In two cases clear evidence of pseudo steady state dual porosity behavior, indicated by the distinctive inflection in the derivative pressure response, was also observed, thus confirming the proposed well test interpretation. Several parametric analyses are also presented to define the geometrical and petrophysical conditions under which evidence of the bilinear flow regime can be expected.

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Bilinear Flow in Horizontal Wells in a Homogeneous Reservoir: Huntington Case Study

Feng

2015

Europec 2015

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In the Huntington field, bilinear flow with a clear one-quarter unit slope in the pressure derivative has been observed during intermediate-times in horizontal well tests, instead of the usual linear flow with a half unit slope expected in a homogeneous reservoir. This paper investigates various analytical methods with numerical methods to explain this behaviour.A number of plausible explanations of this pressure behavior were investigated in this study: rate history or production-time effects; transition between early and late time derivative radial flow stabilizations which could yield a quarter slope straight line on the derivative for specific combinations of horizontal and vertical permeabilities, well length and reservoir thickness; and geological conditions such as high-permeability streaks, the presence of shale barriers, and layering with varying permeability.It was concluded from numerical simulations and geological evidence that the most likely explanation, which yields the best match with well test data, was uniform horizontal permeability and non-uniform vertical permeability increasing from the bottom to the top of the reservoir. This is consistent with the geology of the Huntington field, where the depositional sequence is dominated by high-density turbidity currents.At each sedimentation pulse, heavier pebble/gravel lags were deposited first at the base of channels followed by finer particles which may have formed thin shale drapes. In addition, diagenesis might have led to cementation of pebble/gravel lags. The non-uniform and non-laterally extensive occurrence of the cemented pebble/gravel lags and thin shale drapes act as local baffles to vertical flow but not to horizontal flow resulting in bilinear flow behaviour in the reservoir. This paper offers a unique insight into an integrated effort at combining analytical, numerical well test models and geological evidence to explain the reservoir behavior observed in the Huntington field.

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Transient Dual-Porosity Behavior for Horizontal Wells Draining Heterogeneous Reservoirs

Cited by 4 publications

References 11 publications

Horizontal Wells Pressure Build Up Analysis in Orinoco Heavy Oil Belt

Horizontal Wells Pressure Build Up Analysis in Orinoco Heavy Oil Belt

Transient Dual Porosity Behavior for Horizontal Wells: Case Histories

Bilinear Flow in Horizontal Wells in a Homogeneous Reservoir: Huntington Case Study

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