shale gas desorption machining

Simulation of gas desorption and geomechanics effects for ...

 · 1. Introduction. Shale gas reservoirs have become increasingly important energy sources in the recent years. The combination of horizontal drilling and hydraulic fracturing technology has been widely used to create large and highly fractured network in shale gas reservoirs with ultra-low permeability for economic production.

Investigation of Multiscaled Pore Structure of Gas Shales using ...

3.2. Nitrogen Adsorption-Desorption Isotherms. Figure 1 shows the nitrogen adsorption-desorption isotherms of the representative shale samples collected from the Jiaoshiba area. Qualitative assessment of the porous structure can be obtained based on the isotherms. Although there is difference in the adsorbed amount of nitrogen, the isotherms are all like a reverse "S" …

COAL AND SHALE DESORPTION

 · Desorption of coal samples (cores) and shale is the basic empirical method used to determine the amount and composition of gas in coal (coal bed methane) and in shale (shale gas). GEOKRAK started offering desorption services in the 1990s. We analyzed gas content in coal for AMOCO and TEXACO companies who were exploring coal bed methane in the ...

Study on Desorption Experiment and Desorption Model of Deep Shale Gas …

 · 3.2. Experimental Instruments and Testing Principles. The isothermal desorption experiment of deep shale gas was carried out using an IAA-1020 shale isothermal adsorption instrument (Figure 2).The pressure sensor used in the experiment was a high-temperature resistant sensor (Honeywell, American, model TJE, range: 0–100 MPa and accuracy: ±0.001) …

Modeling Gas Production from Shales and Coal-Beds

Development of shale gas has transformed the energy outlook of US in the past decade. ... Horizontal drilling ... This is due to the combination of multiple porosities, gas desorption and slippage effects. We present two numerical schemes to simulate gas production from such systems. In the Single Porosity Model,

Impact of Gas Desorption on Production from Multiply …

Shale gas is an organic rich formation which has a significant capacity to store natural gas. Shale formations have become a significant source of natural gas in the U.S. Shale gas production has been growing rapidly from 0.3 trillion cubic feet in 1996 …

Some problems concerning measuring shale gas content of rocks with gas ...

Download Citation | Some problems concerning measuring shale gas content of rocks with gas desorption method | The measurement of shale gas content using isotherm desorption method for the complex ...

Characteristics and origin of in-situ gas desorption of the …

 · The residual gas is the gas remaining in the shale core after the in-situ gas desorption test . The in-situ shale gas content is a more reliable measure and can be used for analysis geochemical characteristics of shale . The free and sorbed gas in the in-situ shale gas reservoir exist in dynamic equilibrium . When the shale sample is put into ...

Study on Desorption Experiment and Desorption Model of Deep Shale Gas …

 · The fitting results showed that the improved desorption model can be used to describe the desorption process of deep shale gas containing water and has a strong applicability. In addition, the ...

Characteristics, capability, and origin of shale gas …

The shale gas of the Longmaxi Formation in the southeastern Sichuan Basin was studied based on a shale gas desorption simulation experiment, combined with mineral composition, total organic carbon ...

Shale gas adsorption and desorption characteristics and its …

 · Thus, our shale gas has a great potential for exploitation. According to estimation, China''s shale gas resource that can be exploited is about 31 × 10 12 m 3 (Wang and Wang, 2011). In shale gas reservoir, gas exists in three states: as free gas in cracks, as free gas in matrix pore, and as absorption gas (Lane et al., 1989). Generally, shale ...

CN104749321A

The invention provides a shale gas desorption pressure tester. The tester mainly comprises a cylinder body, a base, an upper cover, a high-pressure micropump and a pressure sensor, wherein a glass observing window is arranged on the cylinder body; the pressure sensor is installed on the upper cover; a liquid inlet is formed in the central position of the upper cover; …

Adsorption Characteristics of CH4 and CO2 in Shale at High …

 · 2.1. Sample Information. In this investigation, drilling cores of the Longmaxi Formation shale gas reservoir in the Changning area of the southern Sichuan Basin (Figure Figure1 1), one of the shale gas exploration and development demonstration areas in China, are selected as the research objects.Four black organic-rich shale samples were collected from …

Marine Shale Gas Occurrence and Its Influencing Factors: A ...

 · Organic-rich shales were found in the Ordovician to Silurian Wufeng-Longmaxi Formation in northwestern Guizhou province, China, which has high shale gas content revealed by field measurement. Shale gas occurrence, free gas/sorbed gas ratio, and their influencing factors are crucial for shale gas exploitation strategy. Results indicated that the Wufeng …

Effects of Seepage on Gas Loss through Shale Desorption

 · This study investigated six adsorption durations (2, 4, 6, 12, 18, and 24 hours) under adsorption pressures of 5, 9, and 13 MPa in shale samples. During each cycle, different injection pressures (2 to 6 MPa) were applied, and seepage resistance of shale samples was measured by the transient method.

Characteristics of desorption gas of lacustrine shale in the Ordos ...

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Desorption

Desorption is the physical process where a previously adsorbed substance is released from a surface. This happens when a molecule gains enough energy to overcome the activation barrier of the bounding energy that keeps it in the surface.. There are a lot of different types of desorption, depending on the mechanism that separates the adsorbate from the substrate; …

Canister desorption method for shale gas content …

gas content. However, in the practice test, the shale gas desorption rate is changed over time[16-17]. Using linear regression relationships exists errors in calculating the result. At present, there is no accurate method to calculate lost gas content[18]. Remained gas refers to the gas that remains in the shale sample after desorption is finished.

Pore Network Modeling of Shale Gas Reservoirs: Gas Desorption and Slip ...

 · Shale reservoirs are characterized by very low permeability in the scale of nano-Darcy. This is due to the nanometer scale of pores and throats in shale reservoirs, which causes a difference in flow behavior from conventional reservoirs. Slip flow is considered to be one of the main flow regimes affecting the flow behavior in shale gas reservoirs and has been widely …

Impact of gas desorption on production behavior of shale gas

Impact of gas desorption on production behavior of shale gas Fatemeh Belyadi Follow this and additional works at: https://researchrepository.wvu /etd Recommended Citation Belyadi, Fatemeh, "Impact of gas desorption on production behavior of shale gas" (2014). Graduate Theses, Dissertations, and Problem Reports. 5182.

The Author(s) 2017 shale gas desorption stages

However, those for shale gas are in the beginning stages, and research on shale gas depends on the current theory of coalbed gas (Li et al., 2016b; Zou et al., 2016). Thus, detailed study of the desorption process of shale gas is a prerequisite to shale gas development.

Experimental investigation of shale gas production with …

 · Gas desorption is one of the major production mechanisms and can be an important factor for ultimate gas recovery. Desorption plays an important role in both defining the longevity and rate of the gas supply. Because the release of adsorbed gas is pressure dependent, a matrix pressure depletion scheme can affect the adsorbed gas production …

CN103063545B

The invention relates to a shale gas content detecting method, including the following steps: firstly connecting pipelines and initializing; secondly recording desorption parameters once; thirdly guiding the flow once; fourthly sampling; fifthly repeating the above steps 2, 3 and 4, obtaining Vs2, Vs3, -Vsn, till pressure reading of the desorption parameters approaching the …

CN109781580A

 · The present invention relates to a kind of methods that evaluation shale gas well oxidation transformation promotes adsorbed gas desorption effect rrosion shale component is aoxidized using oxidizing solution, reduces shale adsorbed methane ability, promotes adsorbed gas desorption, is a kind of effective ways for improving shale gas recovery ratio.The carbon …

Impact of gas desorption on production behavior of …

This dissertation summarizes the results of a modeling study to evaluate the impact of gas desorption on production behavior of multi-fracture horizontal well completed in a shale formation. A numerical reservoir simulator was utilized to generate the production profiles

Characterizing the role of desorption in gas production from …

 · The U.S. Department of Energy''s Office of Scientific and Technical Information

Shale gas adsorption and desorption characteristics and …

 · The results show that the shale gas desorption process within the Longmaxi Formation varies significantly. The total time of the desorption …

Desorption

Gas desorption and analytical services are currently being utilised in the coal seam gas, shale gas and fugitive emissions industries in Australia and worldwide. Wellsite Gas Desorption The services can be performed by our trained geologists and desorption technicians or provided to our clients as an equipment and training package, if you have ...

Effects of Seepage on Gas Loss through Shale Desorption

 · Summary. In the process of shale coring, the gas adsorption will increase the flow resistance of gas inside the core, which will inevitably affect the accuracy of shale gas loss. To clarify the underlying effects of seepage flow and related factors during shale desorption, we conducted an experimental study on the influence of methane on seepage resistance of …

CN105507859A

The invention discloses a method for desorption excitation of adsorbed shale gas. The method includes: sequentially injecting hydrochloric acid and oxidizing agent solution into a shale gas reservoir containing the adsorbed gas after hydrofracture, wherein the hydrochloric acid is used for corrosion of carbonate mineral components of shale, and the oxidizing agent is used for …

CN108896509A

A kind of in-site measurement collects shale gas desorption quantity and the integrated experimental system of component analysis, cylinder is desorbed including glass, glass desorbs setting on cylinder, and there are many measuring devices, sodium chloride brine in glass desorption cylinder is discharged by the gas generated in core sample at different …

Contribution of gas adsorption–desorption in Marcellus shale for ...

Out of many intrinsic features, gas adsorption plays a fundamental role in evaluating shale formations. A sufficient volume of adsorbed gas is stored onto the …

Shale Gas

The matrix of shale rock acts as both the storage material and creator of the gas through the decomposition of organic matter. Since shale occurs naturally with low matrix permeability,, we would require around wellbore stimulation called hydraulic fracturing (fracking) to be able to produce gas for commercial quantities.

Shale gas adsorption and desorption characteristics and its effects …

In shale gas reservoir, gas exists in three states: as free gas in cracks, as free gas in matrix pore, and as absorption gas (Lane et al., 1989). Generally, shale contains high organic

Publication year rev: 7979-2021 / Publication Year: 2021 / Subject ...

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Research Progress on the Desorption Methods of Shale Gas

The evaluation of shale gas content has a great significance on resource prediction,reserve calculation,and exploration and development planning sorption method is one of the methods which is widely applied to the evaluation of shale gas content.The present shale gas desorption method has mainly followed coalbed methane technologies.After the ...