A Finite Horizontal-Well-Conductivity Model for Pressure Transient Analysis in Multiple Fractured Horizontal Wells

Chen, Zhiming; Li, Xinwei; Zhao, Xiaoliang; Dou, Xiangji; Huang, Chongpeng; Chen, Y.; Li, Lei; Guo, Xin

doi:10.2118/177230-ms

Cited by 12 publications

(13 citation statements)

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“…The Ordos Basin is one of the biggest basins in China, with plenty of oil and gas resources (Wang et al, 2014;Chen et al, 2014;Chen et al, 2015). Located in northern China, the Ordos Basin is about 3.2ϫ10 5 km 2 in area and about 5000m in thickness.…”

Section: Geological Settingmentioning

confidence: 99%

Optimization of Injection and Production Parameters for Sour Gas Storages: A Case Study

Chen

Zhao

et al. 2016

Day 2 Wed, March 23, 2016

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To meet with the energy strategy, some natural gas reservoirs in Ordos Basin are planned to use as gas storages. However, most of the gas reservoirs have high content of H 2 S. If they were operated without parameters optimization, it would put reservoir engineers as well as the environment at rick. Thus, optimization of injection and production parameters of these sour gas storages is urgently needed.In the paper, using numerical method, the movement mechanism of H 2 S is studied. With the sensitivity analysis, the effects of some critical factors on H 2 S mole fraction in produced gas are investigated including ultimate recovery factor, injection rate, production rate, and injection-production rate ratio. Based on the results of the sensitivity analysis, optimal injection-production parameters are selected for a gas storage S24 in Ordos Basin.The results show that the H 2 S mole fraction in produced gas decreases as the injection-production cycle number increases. When the cycle number reaches 5, the H 2 S mole fraction is relatively stable. Additionally, the H 2 S mole fraction in produced gas hinges heavily on ultimate recovery factor, injection rate, production rate, and the injection-production rate ratio. The decrease amplitude of H 2 S mole fraction increases as ultimate recovery factor, injection rate, and injection-production rate ratio increase; it decreases as the production rate increases. Numerical results show that after 4 cycles of the operation with the optimal parameters, the produced natural gas from S24 gas storage can reach the quality standard II of commercial natural gas, which is safe for humans and environment.This study provides us with key technical references for operation of the sour gas storages to ease the contradiction between energy supply and demand. 2OTC-26686-MS

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Section: Geological Settingmentioning

confidence: 99%

Optimization of Injection and Production Parameters for Sour Gas Storages: A Case Study

Chen

Zhao

et al. 2016

Day 2 Wed, March 23, 2016

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“…A numerical model for predicting the production was presented by microseismic data in a shale gas reservoir [17]. Based on the planar vertical fractures, many models were presented for production [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

A Semianalytical Approach for Production of Oil from Bottom Water Drive Tight Oil Reservoirs with Complex Hydraulic Fractures

Dai

Chun-qiang²,

Wang

et al. 2019

Journal of Chemistry

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In order to improve the recovery rate, fractured horizontal wells are widely used in tight reservoirs. In general, a complex fracture system is generated in tight reservoirs to improve oil production. Based on the fractal theory, a semianalytical model is presented to simulate a complex fracture system by using the volumetric source method and superposition principle, and the solutions are determined iteratively. The reliability of this model is validated through numerical simulation (Eclipse 2011); it shows that the result from this method is identical with that from the numerical simulation. The study on influence factors of this model was focused on matrix permeability, fractal dimension, and half-length of main fracture. The results show that (1) the production increases with the increase of half-length of main fracture and matrix permeability during the initial production stage, but the production difference becomes smaller in different half-length of main fractures and matrix permeability in middle and later stages and (2) the cumulative production increases with the increase of fractal dimension, and the increments of cumulative production in different fractal dimensions gradually increase during the initial production stage, but the increments tend to be stable in middle and later stages. This study can be used for forecasting the oil production from bottom water tight oil reservoirs with complex hydraulic fractures. It can also guide in optimization of horizontal well fracturing design to improve oil production and oil recovery in bottom water tight oil reservoirs.

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“…Boundary Element Method (BEM) has been successfully applied to many engineering fields such as fracture mechanics, acoustics, electromagnetics, heat transfer, and fluid flow problems because of some advantageous peculiarities like boundary‐only discretization and efficient handling of both complex geometries and infinite domains . However, the systems of equations that arise from its application are nonsymmetric and dense; thus, the method is not practical in solving for large engineering problems unless specific strategies are adopted to reduce the computational demand.…”

Section: Introductionmentioning

confidence: 99%

Iterative coupling algorithms for large multidomain problems with the boundary element method

Wang

Feng

Pieraccini

et al. 2018

Numerical Meth Engineering

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A new parallel Robin-Robin adaptive iterative coupling algorithm with dynamic relaxation parameters is proposed for the boundary element method (BEM), and relaxation parameters are derived for other existing iterative coupling algorithms. The performances of the new algorithm and of the modified existing algorithms are investigated in terms of convergence properties with respect to the number of subdomains, mesh density, interface mesh conformity, and BEM element types. Results show that the number of subdomains and the refinement level of the mesh are the two dominant factors affecting the performances of the considered algorithms. The proposed parallel Robin-Robin algorithm shows the best overall convergence behavior for the tested large problems, thanks to its effectiveness in handling complex boundary conditions and large number of subdomains, thus resulting to be very promising for efficient parallel BEM computing and large coupling problems.Source code is available at https://github.com/BinWang0213/PyBEM2D. KEYWORDSadaptive relaxation, boundary element method, domain decomposition method, iterative coupling method Int J Numer Methods Eng. 2019;117:1-14. wileyonlinelibrary.com/journal/nme

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A Finite Horizontal-Well-Conductivity Model for Pressure Transient Analysis in Multiple Fractured Horizontal Wells

Cited by 12 publications

References 0 publications

Optimization of Injection and Production Parameters for Sour Gas Storages: A Case Study

Optimization of Injection and Production Parameters for Sour Gas Storages: A Case Study

A Semianalytical Approach for Production of Oil from Bottom Water Drive Tight Oil Reservoirs with Complex Hydraulic Fractures

Iterative coupling algorithms for large multidomain problems with the boundary element method

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