Semianalytical Horizontal Well Length Optimization Under Pseudosteady-State Conditions

Czarnota, Robert; Stopa, Jerzy; Janiga, Damian; Kosowski, Piotr; Wojnarowski, Paweł

doi:10.1109/icsgsc.2018.8541341

Cited by 14 publications

(13 citation statements)

References 13 publications

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“…Energies 2019, 12, 2449 3 of 27 (1) This rectangular reservoir is closed at every boundary, and it is anisotropic in the horizontal direction and its porous medium is homogeneous. It has a uniform thickness h with constant porosity φ and its permeability in x and y direction are k x and k y , respectively.…”

Section: Physical Modelmentioning

confidence: 99%

“…Considering that steady state condition rarely occurs in reservoirs, pseudo-steady-state (PSS) flow regime is one of the most important regimes for all closed reservoirs [1,2]. This regime may last for a long time, and many oil or gas wells continue to produce in this regime; thus, a considerable productivity may be recovered from these reservoirs.…”

Section: Introductionmentioning

confidence: 99%

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Pseudo-Steady-State Parameters for a Well Penetrated by a Fracture with an Azimuth Angle in an Anisotropic Reservoir

Xing

Wang

et al. 2019

Energies

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Many oil wells in closed reservoirs continue to produce in the pseudo-steady-state flow regime for a long time. The principal objective of this work is to investigate the characteristics of two key pseudo-steady-state parameters—pseudo-steady-state constant (bDpss) and pseudo-skin factor (S)—for a well penetrated by a fracture with an azimuth angle (θ) in an anisotropic reservoir. Firstly, a general analytical pressure solution for a finite-conductivity fracture with or without an azimuth angle in an anisotropic rectangular reservoir was developed by using the point-source function and spatial integral method, and two typical cases were employed to verify this solution. Secondly, with the asymptotic analysis method, the expressions of pseudo-steady-state constant and pseudo-skin factor were obtained on the basis of their definitions, and the effects of permeability anisotropy, fracture azimuth angle, fracture conductivity and reservoir shape on them were discussed in detail. Results show that all the bDpss-θ and S-θ curves are symmetric around the vertical line, θ = 90° and form a hump or groove shape. The optimized fracture direction in an anisotropic reservoir is perpendicular to the principal permeability axis. Furthermore, a new formula to calculate pseudo-skin factor was successfully proposed based on these two parameters’ relationship. Finally, as an application of pseudo-steady-state constant, a set of Blasingame format rate decline curves for the proposed model were established.

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Section: Physical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Pseudo-Steady-State Parameters for a Well Penetrated by a Fracture with an Azimuth Angle in an Anisotropic Reservoir

Xing

Wang

et al. 2019

Energies

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“…In recent years, due to the development of geological understanding, organic-rich shale has become a hot target for natural gas exploration and development around the world [1][2][3]. At the same time, application of horizontal well technology and hydraulic fracturing has greatly boosted the production efficiency of shale gas [4][5][6][7][8]. In China, a number of shale gas blocks were built successively and achieved large-scale development by 2018, namely Weiyuan, Fushun-Yongchuan, Changning, Dingshan, and Jiaoshiba [9,10].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Gas Composition and Nitrogen Sources of Shale Gas Reservoir under Strong Tectonic Events: Evidence from the Complex Tectonic Area in the Yangtze Plate

et al. 2020

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Strong tectonic movement brings great risk to exploration of shale gas in southern China, especially in Lower Cambrian shale with complex tectonic backgrounds, which has good hydrocarbon-generation matter but low or no gas content. In this paper, the Lower Cambrian shale from the southeast Chongqing region, located in the Upper Yangtze Platform, and the Xiuwu Basin, located in the Lower Yangtze Platform, were selected as the research objects. First, the gas components in shale gas samples were measured, then analysis of nitrogen isotopic was used to reveal the nitrogen sources. Using regional geological backgrounds, core description, and seismic interpretation, combined with the perpendicular and parallel permeability test and focused ion beam–helium ion microscopy (FIB–HIM) observation, the reasons for high content of nitrogen in the Lower Cambrian shale from the Xiuwu Basin and the Southeast Chongqing region were clarified. The results indicate that the main sources of nitrogen in the Lower Cambrian shale gas at the Southeast Chongqing region is the thermal evolution of organic matter and atmosphere. Nitrogen in the atmosphere is filled into the shale reservoir through migration channels formed by detachment layers at the bottom of the Lower Cambrian, shale stratification planes, and widespread thrust faults. Nitrogen was also produced during the thermal evolution of organic matter. Both are responsible for the low content of hydrocarbon and high content of nitrogen of shale gas in the Southeast Chongqing region. Further, the main sources of nitrogen in the Lower Cambrian shale gas at the Xiuwu Basin is the upper mantle, superdeep crust, and atmosphere. Nitrogen in the atmosphere is also filled into the shale reservoir through migration channels formed by detachment layers at the bottom of the Lower Cambrian, shale stratification planes, and widespread thrust faults. Nitrogen was also produced by volcanism during the Jurassic. Both are the causes of the low content of hydrocarbon and high content of nitrogen in shale gas in the Xiuwu Basin. Finally, destruction models for shale gas reservoirs with complex tectonic backgrounds were summarized. This research aimed to provide a theoretical guidance for shale gas exploration and development in areas with complex tectonic backgrounds.

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“…For example, CO2 can easily dissolve into crude oil, so as to reduce the interfacial tension, the viscosity of crude oil and the residual oil saturation. In order to increase oil production and CO2 injection efficiency, a number of methods are used, and among them, horizontal wells play a vital role due to their large flow areas [12]. The CO2 flooding process in the subsurface takes place either in aquifers or sandstone reservoirs with a certain amount of oil.…”

Section: Introductionmentioning

confidence: 99%

Relative Permeability Characteristics During Carbon Capture and Sequestration Process in Low-Permeable Reservoirs

et al. 2020

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The injection of carbon dioxide (CO2) in low-permeable reservoirs can not only mitigate the greenhouse effect on the environment, but also enhance oil and gas recovery (EOR). For numerical simulation work of this process, relative permeability can help predict the capacity for the flow of CO2 throughout the life of the reservoir, and reflect the changes induced by the injected CO2. In this paper, the experimental methods and empirical correlations to determine relative permeability are reviewed and discussed. Specifically, for a low-permeable reservoir in China, a core displacement experiment is performed for both natural and artificial low-permeable cores to study the relative permeability characteristics. The results show that for immiscible CO2 flooding, when considering the threshold pressure and gas slippage, the relative permeability decreases to some extent, and the relative permeability of oil/water does not reduce as much as that of CO2. In miscible flooding, the curves have different shapes for cores with a different permeability. By comparing the relative permeability curves under immiscible and miscible CO2 flooding, it is found that the two-phase span of miscible flooding is wider, and the relative permeability at the gas endpoint becomes larger.

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Semianalytical Horizontal Well Length Optimization Under Pseudosteady-State Conditions

Cited by 14 publications

References 13 publications

Pseudo-Steady-State Parameters for a Well Penetrated by a Fracture with an Azimuth Angle in an Anisotropic Reservoir

Pseudo-Steady-State Parameters for a Well Penetrated by a Fracture with an Azimuth Angle in an Anisotropic Reservoir

Analysis of Gas Composition and Nitrogen Sources of Shale Gas Reservoir under Strong Tectonic Events: Evidence from the Complex Tectonic Area in the Yangtze Plate

Relative Permeability Characteristics During Carbon Capture and Sequestration Process in Low-Permeable Reservoirs

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