Study of Shale Gas Release from Freshly Drilled Core Samples Using a Real-Time Canister Monitoring Technique: Release Kinetics, Influencing Factors, and Upscaling

Nie, Haikuan; Yang, Zhengheng; Dang, Wei; Chen, Qian; Li, Pei; Li, Donghui; Wang, Ruijing

doi:10.1021/acs.energyfuels.9b04122

Cited by 11 publications

(3 citation statements)

References 43 publications

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“…With regard to this, a gas release measurement technique called wellsite canister testing has been adopted to measure the shale gas content and compo-sitions (e.g., methane, ethane, nitrogen, carbon dioxide, and hydrogen) in recent years [10][11][12][13][14]. Here, we use the term "gas release" instead of "gas desorption," and the main reason is that gas production from shale is the outcome of several different types of gas release process, including, but not limited to, desorption, and the gas release process should in fact be referred to "release" in order to encompass all forms of gas release process during canister testing [15,16].…”

Section: Introductionmentioning

confidence: 99%

Insights into the Process of Gas Release from Organic-Rich Shale: Release Characteristics and Controlling Factors

Dang

Wang

et al. 2023

Geofluids

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Shale gas release in canister can significantly enrich our understanding in gas-in-place characteristics. However, studies on shale gas release characteristics and its controlling factors are rare. In this study, gas release curves of 52 shale samples and 3 coal samples were measured using wellsite canister testing technique. According to curve shape, three curve patterns including L-shaped, S-shaped, and M-shaped are identified, and the difference among three curve patterns mainly lies in the fractional gas volume released in surface temperature stage. To evaluate the dependence of released gas content on shale properties, the variation in released gas content with organic matter, minerals, porosity, permeability, specific surface area, and pore volume is analyzed and found that the released gas content shows a strong dependence on the properties that control or could increase gas adsorption and diffusion capacity, such as TOC content, specific surface area, and permeability, while showing no dependence on the properties that control free gas storage capacity, such as minerals, porosity, and pore volume. Additionally, correlations of released gas content with adsorbed/free gas show that the released gas during canister testing is the gas that was in the adsorbed state in reservoir, and the free gas has been lost during coring, as well as a fraction of adsorbed gas. Above findings provide insightful information not only on gas-in-place evaluations but also on the dynamic behavior of adsorbed/free gas from producing well.

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Section: Introductionmentioning

confidence: 99%

Insights into the Process of Gas Release from Organic-Rich Shale: Release Characteristics and Controlling Factors

Dang

Wang

et al. 2023

Geofluids

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“…At present, the focus of the in situ gas desorption test is to obtain the content, composition, and geochemical characteristics of desorbed gas so as to determine the occurrence state and origin of desorbed gas. ,− However, the variation characteristics of the in situ gas desorption curve itself and its geological significance have not attracted enough attention. Different shale gas desorption behaviors have been found in studies of Dang et al on the Shan Formation and Taiyuan Formation shales and Tang et al on the Shuijingtuo Formation shales, but the reasons for this were not explored.…”

Section: Introductionmentioning

confidence: 99%

Gas Desorption Behaviors in the In Situ Gas Desorption Test of Organic-Rich Shales: Implication of Monofractality and Multifractality

Tong,

Zhang,

et al. 2023

Energy Fuels

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“…Dang et al [11] compared different methods for "lost" gas estimation based on a shale gas play in China. Nie et al [12] demonstrated that time-series desorption data of freshly drilled cores can provide valuable information regarding the kinetics of gas release from shale cores.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Canister Core Desorption Gas from Unconventional Reservoirs and Applications to Improve Assessment of Hydrocarbons-in-Place

Cui¹,

Nassichuk²,

Wilson³

2022

Minerals

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Canister core desorption has been successfully applied to coal-bed methane evaluation and exploitation as the technique eliminates the need for time-consuming down-hole fluid retrieval through flow testing. The technique has also been used for the evaluation and exploration of early-stage tight and shale gas reservoirs in recent years, although its success and applicability are poorly understood. In this study, we analyzed a comprehensive canister desorption data set on 230 core samples from nine exploration wells drilled into the Montney Formation in northeastern British Columbia part of the Western Canada Sedimentary Basin (WCSB). The purpose of the study was to illustrate the desorption characteristics of tight rocks and the relationship to reservoir properties and operational parameters. Based on the measured core properties (e.g., porosity, fluid saturation, permeability, total organic carbon (TOC) content, and adsorption isotherms) of canister samples and adjacent core samples, non-isothermal gas transport in cores was modeled to quantify the lost gas during core recovery and lost gas time at the surface. Gas volumes were measured and subsampled by canister desorption tests. The results show that the gas contents measured by on-site canister desorption only accounts for a minor (but significant) portion (about 2 to 25%) of the total gas-in-place in the Montney Formation cores, with the lower percentages being associated with samples of better reservoir qualities (e.g., higher porosity). Over 60–90% (mainly free gas) of the total gas-in-place can be lost during core recovery, and up to 10% can be lost at surface, prior to canister desorption. The measured canister desorption gas is mainly from adsorbed gas, and hence shows strong positive correlation to TOC content. The study shows that the current canister desorption test method severely underestimates in-situ gas content because it fails to correctly estimate the total lost gas content, limiting the successful application of the desorption technique. Nevertheless, the bulk properties and molecular compositions of the desorption gases are strongly correlated to those of the gases produced in the same area, exhibiting distinctive gas composition profiles throughout core desorption for different reservoir types or thermal maturity, and thus can provide invaluable information for the initial evaluation of unconventional plays. A workflow of EOS-based PVT property and compositional modeling is proposed to integrate the core desorption gas test results with core analysis data and mud gas and/or produced gas data for improved characterization of in situ reservoir fluids, and hence, better assessments of hydrocarbons-in-place and evaluations of tight and shale reservoirs.

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Study of Shale Gas Release from Freshly Drilled Core Samples Using a Real-Time Canister Monitoring Technique: Release Kinetics, Influencing Factors, and Upscaling

Cited by 11 publications

References 43 publications

Insights into the Process of Gas Release from Organic-Rich Shale: Release Characteristics and Controlling Factors

Insights into the Process of Gas Release from Organic-Rich Shale: Release Characteristics and Controlling Factors

Gas Desorption Behaviors in the In Situ Gas Desorption Test of Organic-Rich Shales: Implication of Monofractality and Multifractality

Characteristics of Canister Core Desorption Gas from Unconventional Reservoirs and Applications to Improve Assessment of Hydrocarbons-in-Place

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