Alternative Method for Pressure Transient Analysis

Franco, Francy; Rincon, Alexander; Useche, Marcos

doi:10.2118/193261-ms

Cited by 3 publications

(1 citation statement)

References 3 publications

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“…The PTA results provided useful insights to refine previous reservoir characterization in some critical areas such as: transmissibility (kh), well deliverability, mechanical and rate-dependent skin, composite behavior, and reservoir boundary. Franco et al [11] proposed an approach based on the effect of different length of production with different rates in a single well-reservoir. The reservoir model simulated was tested by applying two methods; using the classic build-up test and simulation of different flowrates following period without shut-in periods to obtain the relevant data.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation and Geological Modelling of Conceptual Fluvial Reservoir Systems

Ibrahim

Oluyemi

Nzerem

2021

2021 1st International Conference on Multidisciplinary Engineering and Applied Science (ICMEAS)

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the development of a fluvial reservoir oil or gas field poses complex challenges in field development strategies during appraisal and exploration stage due to some subsurface uncertainties. In this study, the channel geometries such as straight-channel, Y-shaped channel and U-shaped channel are assessed based on conceptual geological modelling. In order to provide robust information, a case scenario for both oil and gas fluvial producing reservoir are simulated using ECLIPSE 100a black oil simulator, with data which has been adopted from Walsh and Gringarten [2]; Hogg et al. [6]. The result of the study shows that the pressure behaviour in the different channels is because of the change in channel geometry. This property determines the hydrocarbon recovery method and as such integration of analytical method, numerical simulation and geological modelling are employed as tools for planning field development strategies in fluvial reservoirs.

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Section: Introductionmentioning

confidence: 99%

Numerical Simulation and Geological Modelling of Conceptual Fluvial Reservoir Systems

Ibrahim

Oluyemi

Nzerem

2021

2021 1st International Conference on Multidisciplinary Engineering and Applied Science (ICMEAS)

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Optimized Isochronal Flow Tests

Franco

Rincon

Useche

2018

Day 1 Mon, November 12, 2018

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An Optimized Isochronal Test (OIT) is presented to evaluate the deliverability of a reservoir eliminating the need of shut-in periods during a multirate well test, which represents an operational constraint for classical isochronal tests and in some instances for modified isochronal tests. The proposed technique is based on the effect of several consecutive and different production rates over the well-reservoir model during both transient flow and pseudo-steady state flow; thus, it is possible to estimate the reservoir pressure at different radius of investigation, and the ratio between production volume and pressure drop. This method does not require stabilization of static reservoir pressure after a flowing period since it is calculated using a mathematical procedure based on the transient pressure equation. A reservoir simulation model with known petrophysical parameters, fluid properties, pressure and temperature, is used as a reference to evaluate the accuracy of the proposed methodology. Two types of fluids are tested, a low compressible black oil and a high compressible gas condensate, with the objective to demonstrate the optimized isochronal test applicability with pressure, pressure squared P^2, and pseudo-pressure Ψ(P) equations. The production deliverability is evaluated applying four different analysis: flow after flow test, isochronal flow test, modified isochronal flow test and the proposed optimized isochronal flow test; the results are compared and analyzed using the percentage of error found for every method. The optimized isochronal analysis provides the option to avoid shut-in periods during a multipoint well test and provide reliable production deliverability curves. OIT has a direct impact in reduction of costs and deferred production for companies involved in oil and gas operations.

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Automatic Production Rate Estimation Workflow Considering the Reservoir Flow Regime - Kuwait Integrated Digital Oilfield

Al-Salali

Al-Awadhi

Hajjeyah

et al. 2022

Day 3 Wed, February 23, 2022

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This paper presents an automated workflow that can estimate the oil and gas rates of a well, with the high frequency data, distinguishing the behavior of the reservoir under transient flow and pseudo steady state flow conditions. The new approach matches the wellhead pressure of a well model with the current value reported by a SCADA system, by adjusting the bottomhole pressure. For transient flow, it considers the response of the inflow performance relationship as a function of time. For pseudo steady state flow, it considers the declination of the reservoir pressure. The estimation of the production rate is carried out every 15 minutes, and the total daily produced volume is calculated based on the effective flowing time. To evaluate the accuracy of the new well rate estimation workflow, the output of the workflow is evaluated using two different criteria. Initially, the estimated oil and gas productions are compared with data from a real well test that is used as a quality control point. Secondly, considering that the fluid properties remain stable over time (water cut and gas-oil ratio), the critical flow through a choke valve defines a historical production trend that is used to quantify the deviation of the estimated values. As a result of the new workflow application, the difference between the estimated and measured rates decreased from 10% to 3%. The novelty of the new method is that it reduces the error of the estimated oil and gas production rates using the actual reservoir pressure behavior and provides more precise data for the different reservoir engineering analyzes.

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Alternative Method for Pressure Transient Analysis

Cited by 3 publications

References 3 publications

Numerical Simulation and Geological Modelling of Conceptual Fluvial Reservoir Systems

Numerical Simulation and Geological Modelling of Conceptual Fluvial Reservoir Systems

Optimized Isochronal Flow Tests

Automatic Production Rate Estimation Workflow Considering the Reservoir Flow Regime - Kuwait Integrated Digital Oilfield

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