Analysis of pressure derivative data of hydraulically fractured wells by the Tiab's Direct Synthesis technique

Tiab, Djebbar

doi:10.1016/j.petrol.2005.07.001

Cited by 41 publications

(19 citation statements)

References 17 publications

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“…Fig. 15 provides a detailed presentation of the hydrodynamic flow behaviour during transient pumping, based on the classical description of the derivative of pressure in a fault context (Bourdet and Ayoub, 1989;Escobar and Hernández, 2010;Moench, 1984;Rafini and Larocque, 2012;Renard et al, 2008;Tiab, 2005), along with a hydrodynamic interpretation of the experiment previously described Roques et al, 2014). These observations are compared with the discharge fractions from each aquifer domain deduced from the EMMA model (Table 2 and Fig.…”

Section: Flow Contribution Of Reservoirs During Pumping Testmentioning

confidence: 99%

“…In the case of fault, models of transient hydrodynamic behaviour during pumping are now well established (Anderson, 2006;Dewandel et al, 2014Dewandel et al, , 2011Rafini and Larocque, 2012;Roques et al, 2014). It involves two main phases: (i) an early stage where water is mainly coming from storage in the fault and (ii) due to the limited storativity of this structure, a second stage during which adjacent reservoirs contribute to the flow by leakage (Escobar and Hernández, 2010;Gringarten, 1996;Moench, 1984;Rafini and Larocque, 2009;Roques et al, 2014;Tiab, 2005). These transient hydrodynamic specificities imply some temporal exchange and mixing between reservoirs during pumping that may be associated with geochemical changes.…”

Section: Introductionmentioning

confidence: 99%

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Groundwater sources and geochemical processes in a crystalline fault aquifer

Roques

Aquilina

Bour

et al. 2014

Journal of Hydrology

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International audienceThe origin of water flowing in faults and fractures at great depth is poorly known in crystalline media.This paper describes a field study designed to characterize the geochemical compartmentalization of adeep aquifer system constituted by a graben structure where a permeable fault zone was identified. Analysesof the major chemical elements, trace elements, dissolved gases and stable water isotopes reveal theorigin of dissolved components for each permeable domain and provide information on various watersources involved during different seasonal regimes. The geochemical response induced by performinga pumping test in the fault-zone is examined, in order to quantify mixing processes and contributionof different permeable domains to the flow. Reactive processes enhanced by the pumped fluxes are alsoidentified and discussed.The fault zone presents different geochemical responses related to changes in hydraulic regime. Theyare interpreted as different water sources related to various permeable structures within the aquifer.During the low water regime, results suggest mixing of recent water with a clear contribution of olderwater of inter-glacial origin (recharge temperature around 7 C), suggesting the involvement of watertrapped in a local low-permeability matrix domain or the contribution of large scale circulation loops.During the high water level period, due to inversion of the hydraulic gradient between the major permeablefault zone and its surrounding domains, modern water predominantly flows down to the deep bedrockand ensures recharge at a local scale within the graben.Pumping in a permeable fault zone induces hydraulic connections with storage-reservoirs. The overlaidregolith domain ensures part of the flow rate for long term pumping (around 20% in the present case).During late-time pumping, orthogonal fluxes coming from the fractured domains surrounding the majorfault zone are dominant. Storage in the connected fracture network within the graben structure mainlyensures the main part of the flow rate (80% in the present case). Reactive processes are induced by mixingof water from different sources and transfer conditions. A specific approach is applied to quantify thereaction rate involved along the pumping time. Autotrophic denitrification coupled with iron mineralsoxidation is highlighted and water rock interaction is clearly enhanced by the flux changes induced bypumping

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Section: Flow Contribution Of Reservoirs During Pumping Testmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Groundwater sources and geochemical processes in a crystalline fault aquifer

Roques

Aquilina

Bour

et al. 2014

Journal of Hydrology

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“…This technique has been successfully applied to pressure analysis of vertically fractured well in closed systems for both uniform flux and infinite conductivity vertical fracture cases with wellbore storage and mechanical skin factor (Tiab, 1994). This technique was also applied to finite conductivity hydraulic vertical fracture (Tiab, 2005). For simplicity, we assume there is no wellbore storage or damage along the fracture.…”

Section: Application Of Tds Technique For Pressure Analysis Of a Wellmentioning

confidence: 99%

Transient-Pressure Analysis of a Well With an Inclined Hydraulic Fracture Using Tiab's Direct Synthesis Technique

Dinh

Tiab

2009

SPE Production and Operations Symposium

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The purpose of this study is to develop a technique, based on the pressure derivative concept, for interpreting pressure transient tests in wells with an inclined hydraulic fracture. Detailed analysis of unsteady-state pressure behavior of fully penetrating inclined fracture in an infinite slab reservoir was provided. Both uniform flux and infinite conductivity models were considered. The study has shown that inclined fracture pressure data exhibit similar flow regimes as for vertical fracture counterpart. Those flow regimes are linear and pseudo-radial flow for both uniform flux and infinite conductivity models. However, for infinite conductivity model, a bi-radial flow regime is also observed. In the case of high formation thickness to fracture half length ratio and high angle of inclination, both uniform flux and infinite conductivity inclined fracture model exhibit an additional flow regime called early radial flow. Both bi-radial flow and early radial flow regimes for inclined hydraulic fracture have not been mentioned in the literature before.A step by step procedure based on Tiab's Direct Synthesis (TDS) was developed in this study. Fracture properties such as half fracture length, inclination angle, formation permeability and pseudo-skin factor can be obtained from the direct interpretation of the log-log plot of pressure and pressure derivative without the need of any type curve matching. Several unique features of the pressure and pressure derivative plots of both uniform flux and infinite conductivity inclined fracture models were identified including the points of intersection of straight lines for different flow regimes. These points can be used to verify the results or to calculate unknown parameters. Equations associated with these features were derived and their usefulness was demonstrated. Numerical examples with both pressure build-up and drawdown data were also demonstrated for this procedure.

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“…Many numerical approaches (Narasimhan and Palen 1979;Bennett et al 1983;Berumen et al 2000) and semianalytical solutions (Resurreicão and Fernando 1991;Rodriguez et al 1992;Wang et al 2013) have been reported to discuss the effect of the AF on the transient-pressure behavior. Many numerical approaches (Narasimhan and Palen 1979;Bennett et al 1983;Berumen et al 2000) and semianalytical solutions (Resurreicão and Fernando 1991;Rodriguez et al 1992;Wang et al 2013) have been reported to discuss the effect of the AF on the transient-pressure behavior.…”

Section: Introductionmentioning

confidence: 99%

“…Many numerical approaches (Narasimhan and Palen 1979;Bennett et al 1983;Berumen et al 2000) and semianalytical solutions (Resurreicão and Fernando 1991;Rodriguez et al 1992;Wang et al 2013) have been reported to discuss the effect of the AF on the transient-pressure behavior. Recently, Wang et al (2013) extended the method of Rodri-guez and Cinco-Ley to study the pressure-transient behaviors of asymmetric fractured wells in coal-seam reservoirs. Recently, Wang et al (2013) extended the method of Rodri-guez and Cinco-Ley to study the pressure-transient behaviors of asymmetric fractured wells in coal-seam reservoirs.…”

Section: Introductionmentioning

confidence: 99%

Pressure-Transient Analysis of Multiwing Fractures Connected to a Vertical Wellbore

Luo

Tang

2014

SPE Journal

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The principal focus of this work is on transient-pressure behaviors of multiwing fractures connected to a vertical wellbore. The vertical well is fractured with multiple-fracture wings with varied intersection angle, length, and asymmetry factor (AF). In the case of equally spaced fractures connected to a vertical wellbore, three flow regimes may be observed: bilinear-flow regime, formation linear flow, and pseudoradial-flow regime. With the increase of fracture numbers, the interaction of fractures becomes stronger and a "hump" occurs on the curves of pressure derivative for low and moderate fracture conductivities. For an anisotropic formation, the fracture may grow at a specific azimuth, and a fracture cluster develops. Because of the strong interactions among fracture clusters, the end of bilinear flow occurs earlier, and the formation linear flow will not be observed even for high fracture conductivities. In some extreme case in which a vertical well is intercepted with highly asymmetrically distributed fracture clusters, its transient performances of pressure and pressure-derivative curves may deviate from the conventional type curves totally. In addition, it is found that the complexity of multiple fractures near the wellbore can enhance the recovery of oil and gas.

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Analysis of pressure derivative data of hydraulically fractured wells by the Tiab's Direct Synthesis technique

Cited by 41 publications

References 17 publications

Groundwater sources and geochemical processes in a crystalline fault aquifer

Groundwater sources and geochemical processes in a crystalline fault aquifer

Transient-Pressure Analysis of a Well With an Inclined Hydraulic Fracture Using Tiab's Direct Synthesis Technique

Pressure-Transient Analysis of Multiwing Fractures Connected to a Vertical Wellbore

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