Investigation of formation heat treatment to enhance the multiscale gas transport ability of shale

Kang, Yili; Chen, Mingjun; Chen, Zhangxin; You, Lijun; Hao, Zhiwei

doi:10.1016/j.jngse.2016.08.058

Cited by 59 publications

(38 citation statements)

References 35 publications

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“…The enhancement of matrix diffusivity and gas desorption is a key issue to sustain high gas production rate. Therefore, artificial treatments such as heating recovery [37,38] to change the micro-structure of matrix are key to enhance the gas recovery for long-term gas production. Influences of factors on GRR for short-term and long-term gas production.…”

Section: Sensitivity Analysismentioning

confidence: 99%

A Multi-Parameter Optimization Model for the Evaluation of Shale Gas Recovery Enhancement

et al. 2018

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Although a multi-stage hydraulically fractured horizontal well in a shale reservoir initially produces gas at a high production rate, this production rate declines rapidly within a short period and the cumulative gas production is only a small fraction (20-30%) of the estimated gas in place. In order to maximize the gas recovery rate (GRR), this study proposes a multi-parameter optimization model for a typical multi-stage hydraulically fractured shale gas horizontal well. This is achieved by combining the response surface methodology (RSM) for the optimization of objective function with a fully coupled hydro-mechanical FEC-DPM for forward computation. The objective function is constructed with seven uncertain parameters ranging from matrix to hydraulic fracture. These parameters are optimized to achieve the GRR maximization in short-term and long-term gas productions, respectively. The key influential factors among these parameters are identified. It is established that the gas recovery rate can be enhanced by 10% in the short-term production and by 60% in the long-term production if the optimized parameters are used. Therefore, combining hydraulic fracturing with an auxiliary method to enhance the gas diffusion in matrix may be an effective alternative method for the economic development of shale gas.

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Section: Sensitivity Analysismentioning

confidence: 99%

A Multi-Parameter Optimization Model for the Evaluation of Shale Gas Recovery Enhancement

et al. 2018

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“…水平井分段压裂技术, 其能大幅度提高裂缝网络与基质的接触面积 [39] , 因此该技术已经成为页岩气经济开发的前提和核心技术, 但需要指出的是, 该方法对于基质孔隙的改造还具有一定局限性 [36] .…”

Section: 当前的开发实践表明页岩气产能与压裂形成的裂缝unclassified

Characteristics of multiscale mass transport and coordination mechanisms for shale gas

et al. 2018

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Carbon isotope fractionation during shale gas transport: Mechanism, characterization and significance SCIENCE CHINA Earth Sciences 63, 674 (2020); Characteristics and mechanisms of the annual asymmetry of thermospheric mass density SCIENCE CHINA Earth Sciences 58, 540 (2015); Real gas transport through nanopores of shale gas reservoirs SCIENTIA SINICA Technologica 46, 68 (2016); Recovery mechanisms and key issues in shale gas development

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“…25 The success of this experimental study of spontaneous capillary water imbibition and the advances of gas permeability measurements has resulted in WPT damage evaluation becoming a topic of considerable interest in tight gas reservoir research. Other work on WPT has focused on examining the effects of rock permeability, 17 wettability, 26,27 interfacial tension, 5 capillary force, [14][15][16] water saturation, 5,28,29 invasion depth, [14][15][16] formation temperature, and formation pressure, 5,13,30 all with the aim of reducing or eliminating the damage more effectively.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the controlling rock petrophysical factors on water phase trapping damage in tight gas reservoirs

Tian

Kang

Jia

et al. 2019

Energy Science & Engineering

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This paper presents an investigation into the effect of rock physical parameters on water phase trapping (WPT) damage in tight gas reservoirs. The investigation involved water imbibition and drainage experiments that were performed to simulate the WPT formation process. Gas permeability was measured before and after WPT, and an empirical formula was used to determine water film thickness in order to examine the influence of WPT on effective gas flow channel. Results showed that the average water saturation of 15 tight core samples increased from 19.41% to 44.76% during water imbibition and declined to 38.72% after drainage. Increments in water saturation caused a degree of damage to gas permeability in the 36.03%‐78.10% range with an average value of 59.31%. Comparative analysis showed that the dominant factors affecting WPT were average pore throat radius followed by rock permeability and porosity. Meanwhile, calculations showed that water film thickness in the 21.22‐38.18 nm range correlated to a reduced effective gas flow channel of 20.20‐45.15 nm caused by WPT, which suggests that tight rocks with smaller pore throats may be particularly sensitive to WPT damage. The relative size of the water film filling the pore throat, trapping gas, and reducing the effective gas flow channel together with the size of the pore throat itself were found to be the most common damage mechanisms of WPT and have proven to be fundamentally beneficial in understanding the controlling factors of these damage mechanisms.

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Investigation of formation heat treatment to enhance the multiscale gas transport ability of shale

Cited by 59 publications

References 35 publications

A Multi-Parameter Optimization Model for the Evaluation of Shale Gas Recovery Enhancement

A Multi-Parameter Optimization Model for the Evaluation of Shale Gas Recovery Enhancement

Characteristics of multiscale mass transport and coordination mechanisms for shale gas

Investigation of the controlling rock petrophysical factors on water phase trapping damage in tight gas reservoirs

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