Semi-Analytical Model Based on the Volumetric Source Method to Production Simulation from Nonplanar Fracture Geometry in Tight Oil Reservoirs

Li, Ting; Tan, Yamin; Dai, Shuhui; Zhou, Xun; Jia, Yu; Yang, Qi

doi:10.1021/acsomega.0c05119

Cited by 5 publications

(4 citation statements)

References 26 publications

(60 reference statements)

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“…55 A semianalytical model was proposed for tight formation with a nonplanar fracture based on a volumetric source method. 56 These models incorporated multiple flow mechanisms (sorption, diffusion, and stress-sensitivity permeability) for shale gas reservoirs. The models are capable of matching some portions of gas production accurately.…”

Section: Introductionsupporting

confidence: 56%

“…The stress sensitivity on the matrix and the fracture system found that either the matrix or the fracture subsystem has its passive influence on the transient production rate . A semianalytical model was proposed for tight formation with a nonplanar fracture based on a volumetric source method . These models incorporated multiple flow mechanisms (sorption, diffusion, and stress-sensitivity permeability) for shale gas reservoirs.…”

Section: Introductionmentioning

confidence: 99%

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Novel Model for Rate Transient Analysis in Stress-Sensitive Shale Gas Reservoirs

Long

et al. 2021

ACS Omega

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Technical advances in hydraulic fracturing and horizontal drilling technologies enable shale to be commercially exploited. Due to the technical and economic limitations of well testing in shale gas plays, rate transient analysis has become a more attractive option. After hydraulic fracturing, flow mechanisms in multiple scaled pores of shale become extraordinarily complicated: adsorption in nanopores, diffusion in micropores, and non-Darcy flow in macropores. Moreover, shale gas reservoirs are stress-sensitive because of ultralow permeability and diffusivity in a matrix. Furthermore, the porosity and permeability of natural fractures are stress-dependent as well. Accounting for all of these complex flow mechanisms, especially the aforementioned stress-sensitive parameters, a semianalytical production solution of a multiple fractured horizontal well (MFHW) can rapidly predict the entire production behavior. Scholars have done much work on the complex flow mechanisms of shale. Most models regarded permeability as a stress-sensitive parameter while diffusivity and porosity were considered to be a constant. However, diffusivity and porosity were proved to be stress-sensitive as experimental science developed. In this study, we present a novel semianalytical model for rate transient analysis of MFHW, which simultaneously incorporates multiple stress-sensitive parameters into flow mechanisms. Substituting stress-dependent parameters (diffusivity, porosity, and permeability) into governing equations resulted in strong nonlinearities, which was solved by employing the perturbation method. Production behaviors with only stress-sensitive permeability were compared with multiple stress-dependent parameters. The new model with multiple stress-sensitive parameters declined slower than the permeability-sensitive model, and the new model matched better with the field data. In addition, the effects of major stress-sensitive parameters on production decline curves were analyzed by the proposed model. The sensitivity analysis indicated that different parameters had their own degree of sensitivity intensity and influence on the production period. Finally, 1001 wells from the Marcellus shale play were divided into three well groups. Estimated inversion values of reservoir parameters from the three well groups and relevant single wells were consistent with the field data. The inverted values of single wells fluctuate within the inversion values of well groups, which indicates that the production behavior of well groups could be a guide for rate transient analysis of a single well in shale gas reservoirs.

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Section: Introductionsupporting

confidence: 56%

Section: Introductionmentioning

confidence: 99%

Novel Model for Rate Transient Analysis in Stress-Sensitive Shale Gas Reservoirs

Long

et al. 2021

ACS Omega

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“…Over the past few decades, many researchers have focused on horizontal well oil/gas inflow along the horizontal wells, − and this problem involves complex reservoir seepage, wellbore flow, and their relationship. − Penmatcha and Aziz and Ozkan et al developed reservoir/well models by the point source function to predict the flow rate and pressure distribution along the horizontal wellbore, and the point source function was also widely used for transient pressure analysis in other gas reservoirs such as the coalbed methane gas reservoir, − but the solution of the point source function has the characteristic of singularity . Vicente et al developed a three-dimensional implicit simulator to solve the coupling equation between the reservoir and wellbore.…”

Section: Introductionmentioning

confidence: 99%

Effect of Sulfur Deposition on the Horizontal Well Inflow Profile in the Heterogeneous Sulfur Gas Reservoir

et al. 2021

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A semianalytical coupled reservoir/wellbore model based on the volumetric source for horizontal wells of sulfur gas reservoirs is presented, which considers sulfur deposition and permeability heterogeneity. Compared to the results without considering the sulfur deposition effect, the results of this paper model is better fitted to field production data and average relative errors of two simulated results are 8.37% (considering sulfur deposition) and 23.38% (not considering sulfur deposition). Based on the model, we perform sensitivity in terms of various sulfur depositions, producing pressure drop, and permeability contrast. Results show that the production decreases with increased sulfur deposition, and the flow rate along the wellbore in the horizontal well decreases because of sulfur deposition. The production without and with sulfur deposition increases with increased producing pressure drop, while the production without sulfur deposition is higher. Also, higher producing pressure drop causes a higher nonuniform inflow profile along the horizontal well. Sulfur deposition can reduce a nonuniform biased inflow profile along the horizontal well in heterogeneous sulfur gas reservoirs, but the horizontal well production is reduced. Therefore, sulfur deposition is crucial for the production prediction and inflow profile along the horizontal well in heterogeneous sulfur gas reservoirs.

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“…With the depletion of conventional energy and the increasing demand of humans, unconventional energy exploitation has become a global focus. − Sour gas reservoirs are an important part of unconventional gas reservoirs and are widely distributed all over the world. , However, elemental sulfur is often precipitated when the temperature and pressure drop. Elemental sulfur blocks pores, resulting in a decrease in porosity and permeability, and then the production of sour gas wells will be reduced.…”

Section: Introductionmentioning

confidence: 99%

Fractal Model for Predicting Elemental Sulfur Saturation in the Presence of Natural Fracture

Shao

Yang

et al. 2021

ACS Omega

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Sour gas reservoirs are an important part of unconventional gas reservoirs, which are widely distributed in the world. However, elemental sulfur deposition, channel plugging, and productivity reduction consequentially occur in the development of high sour gas fields as pressure drops. The accurate prediction of sulfur deposition is a very important work for sour gas reservoirs. In this paper, a fractal model is presented for predicting elemental sulfur saturation in the presence of natural fracture. The model takes into consideration the effects of non-Darcy flow. In addition, the influence parameters such as fractal dimension, fractal index, and non-Darcy flow are studied. The results showed the following: (1) sulfur deposition was overestimated by Hu’s model, and this paper model is more accurate for prediction of sulfur deposition; (2) elemental sulfur deposition decreases with the increase of the fractal dimension, while elemental sulfur deposition increases with the decrease of the fractal index; and (3) non-Darcy flow should be considered because it causes a faster rate of sulfur deposition. This research will provide a basis and reference for predicting elemental sulfur saturation in the presence of natural fracture for sour gas reservoirs.

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Semi-Analytical Model Based on the Volumetric Source Method to Production Simulation from Nonplanar Fracture Geometry in Tight Oil Reservoirs

Cited by 5 publications

References 26 publications

Novel Model for Rate Transient Analysis in Stress-Sensitive Shale Gas Reservoirs

Novel Model for Rate Transient Analysis in Stress-Sensitive Shale Gas Reservoirs

Effect of Sulfur Deposition on the Horizontal Well Inflow Profile in the Heterogeneous Sulfur Gas Reservoir

Fractal Model for Predicting Elemental Sulfur Saturation in the Presence of Natural Fracture

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