Integrated study of gas condensate reservoir characterization through pressure transient analysis

Li, Jiawei; Zhao, Gang; Jia, Xiaohan; Yuan, Wanju

doi:10.1016/j.jngse.2017.07.017

Cited by 14 publications

(7 citation statements)

References 35 publications

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“…The larger the pressure conductivity ratio, the higher the position of the horizontal line. (7) At the boundary influence stage, different external boundary conditions have different effects on the quasi pressure and its derivative curve shape. Under closed outer boundary conditions, the pseudo pressure and its derivative curve are severely warped due to the influence of the closed boundary.…”

Section: Comparison Of Flow Patternsmentioning

confidence: 99%

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Well Test Analysis of Inclined Wells in the Low-Permeability Composite Gas Reservoir Considering the Non-Darcy Flow

Zhang²,

Keying³

et al. 2022

Energies

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The application of traditional well test interpretation methods cannot comprehensively consider characteristics of stress sensitivity and non-Darcy flow for low-permeability composite gas reservoirs, which makes it difficult to obtain real reservoir parameters. Based on the micro-mechanism analysis of stress sensitivity and non-Darcy flow in low-permeability gas reservoirs, the flow motion equation was improved. Thus, a mathematical model was established which belongs to the inclined well in the composite gas reservoir with a conventional internal zone and low-permeability external zone. Applying the finite element method to solve the flow model through Matlab programming, the equivalent pressure point was selected to research the pressure distribution of the inclined well. On this basis, the bottom hole pressure dynamic curve was drawn, the flow process was divided into seven stages, and the parameter sensitivity analysis was carried out. Finally, the advanced nature of the new model applied to the interpretation of the well test model is compared by conventional methods. The non-Darcy flow can cause the gradual upward warping of the bottom hole pressure dynamic curve in the later stage, and non-linear enhancement leads to an increase in the upturn through the simulation test. When the inclination angle is greater than 60°, early vertical radial flow and mid-term linear flow gradually appear. A decrease leads to a shorter duration of the pseudo radial flow in the internal zone and the radius of the internal zone. The conduction coefficients ratio of internal and external zones affects the pseudo pressure derivative curve slope in transition phase of pseudo radial flow in the internal and external zones. A comprehensive consideration of the low-permeability composite gas reservoir flow characteristics can improve the fitting degree of the pressure curves. Not only that, but it can also solve the strong diversification of reservoir parameters. Results have a guiding significance for low-permeability composite gas reservoir development and pressure dynamic evaluation in inclined wells.

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Section: Comparison Of Flow Patternsmentioning

confidence: 99%

“…Many scholars have conducted multiple studies on composite gas reservoirs with different physical properties [5][6][7][8][9]. Among them, Meng et al [10] believed that the matrix interaction, pores and fractures can be described by a three-porosity model.…”

Section: Introductionmentioning

confidence: 99%

Well Test Analysis of Inclined Wells in the Low-Permeability Composite Gas Reservoir Considering the Non-Darcy Flow

Zhang²,

Keying³

et al. 2022

Energies

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“…It was not until 2018 that Zhang and colleagues introduced the first composite model for horizontal GCR with three zones, which, however, assumed isotropy and is not applicable to GCR with developed natural fractures . Subsequently, both the vertical well model incorporating natural fractures and the fracturing model for horizontal wells were introduced. − In recent studies, Wang proposed a novel semianalytical model to accurately describe the bottom-hole pressure behavior of water injectors in fractured reservoirs . Additionally, Wei developed analytical models to comprehensively investigate the intricate thermal behavior of fractured reservoirs .…”

Section: Introductionmentioning

confidence: 99%

“… 27 Subsequently, both the vertical well model incorporating natural fractures and the fracturing model for horizontal wells were introduced. 28 − 30 In recent studies, Wang proposed a novel semianalytical model to accurately describe the bottom-hole pressure behavior of water injectors in fractured reservoirs. 31 Additionally, Wei developed analytical models to comprehensively investigate the intricate thermal behavior of fractured reservoirs.…”

Section: Introductionmentioning

confidence: 99%

Single-Well Simulation for Horizontal Wells in Fractured Gas Condensate Reservoirs

Yin,

Cheng,

Bai

et al. 2024

ACS Omega

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Fractured gas condensate reservoirs (FGCR) are a complex, special, and highly valuable type of gas reservoir, accounting for a significant proportion of gas reservoir development. In recent years, with the continuous advancement of horizontal well technology, it has become the main approach for the development of FGCR. The current model is unable to accurately represent the fluid distribution in the near-well area of horizontal wells due to the unique retrograde condensation phenomenon in GCR. Additionally, the presence of fractures complicates the solution of traditional analytical models. In response to this issue, this paper proposes a novel semianalytical model for horizontal wells in FGCR, which incorporates natural fractures, multiphase flow, and the influence of stress sensitivity on pressure response. A dual-porosity model is employed to simulate fractured reservoirs, and a four-region radial composite model is developed to characterize multiphase flow resulting from retrograde condensation in GCR. The pseudopressure transform, Pedrosa transform, Laplace transform, and Finite Cosine transform are utilized to address the nonlinear partial differential equation. A systematic verification of the semianalytical solution is confirmed through a comparison with the numerical solution from computer modeling group (CMG). We thoroughly explain the physical significance of the various features by identifying the 12 flow regimes of the typical curve. Furthermore, we offer a method for assessing the extent of retrograde condensation and the size of the retrograde condensate region based on the curve's characteristics. Finally, the pressure measurements recorded from the Bohai field are carried out to validate the accuracy of the proposed model. The results show that the predictions of the new model are in good agreement with the actual production data, demonstrating the proposed solution's applicability.

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“…Abdolnabi and Gringarten applied composite models to horizontal wells. , Bozorgzadeh and Kgogo each gave an opinion that the type curves of lean and medium-rich condensate gas fluids have three-zone radial composite behavior. , However, rich gas fluids exhibit only two-region radial composite behavior . Shahbazi and Zhang proposed an analytical model to explain well test data in gas condensate reservoirs which provided a detailed explanation of the pressure transient analysis curve characteristics for horizontal wells. , Li presented a semianalytical model considering different gas components of the gas condensate reservoir . Dastan proposed a semianalytical model for natural fractured reservoirs under the condition of oil–water two-phase flow .…”

Section: Introductionmentioning

confidence: 99%

Semianalytical Modeling for Multiphase Flow in a Fractured Low-Permeability Gas Condensate Reservoir

Yin,

Cheng,

Liu

et al. 2023

ACS Omega

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During the production of fractured low-permeability gas condensate reservoir (FLPGCR), a phase transition takes place in both the formation and wellbore, resulting in multiphase flow when the pressure drops below the dew point pressure. Additionally, the presence of fractures causes the formation of stress-sensitive characteristics. Nevertheless, traditional analytical models, such as the two-region model or three-region model, overlook the coupling impact of the above factors, which could lead to incorrect pressure transient response and erroneous estimation of well and formation parameters. Therefore, this work presents a semianalytical model for an FLPGCR considering the effects of multiphase flow, stress-sensitive, and wellbore phase redistribution. The gas condensate reservoir is divided into N banks, and the radial fluid saturation variation is modeled by multiple annular reservoirs with a constant saturation in each annular reservoir. The behavior of a fractured reservoir is modeled by using the dualporosity model. The Pedrosa transform was utilized to address the nonlinear differential equation arising from stress-sensitive behavior. To verify the semianalytical solution, it was compared with numerical simulation results from CMG. The results showed that there are 10 flow regimes for the proposed model. The shape of the type curve has the potential to identify the degree of blockage within the FLPGCR. The wellbore phase redistribution only affects the first transitional-flow regime, which slows the rate of pressure drop. The stress sensitivity will lead to the upward characteristic of the curve in a later stage. More attention should be paid to the upward pressure derivative curve at late times, which is conventionally regarded as the effect of a closed boundary when it may not be the case. In addition, the shape factor and composite radius may obscure the radial flow regime. Finally, the proposed model was applied to interpret the pressure measurements recorded from the Bohai field in China, which exhibits a better fitting quality than the traditional models.

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Integrated study of gas condensate reservoir characterization through pressure transient analysis

Cited by 14 publications

References 35 publications

Well Test Analysis of Inclined Wells in the Low-Permeability Composite Gas Reservoir Considering the Non-Darcy Flow

Well Test Analysis of Inclined Wells in the Low-Permeability Composite Gas Reservoir Considering the Non-Darcy Flow

Single-Well Simulation for Horizontal Wells in Fractured Gas Condensate Reservoirs

Semianalytical Modeling for Multiphase Flow in a Fractured Low-Permeability Gas Condensate Reservoir

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