Confined Phase Envelope of Gas-Condensate Systems in Shale Rocks

Nagy, Stanisław; Siemek, J.

doi:10.2478/amsc-2014-0069

Cited by 11 publications

(8 citation statements)

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“…The analysis of literature [3,12] reveals that shales containing above 1-2% TOC have sufficient (commercial) amounts of gas, which can be produced. The best shales may reach even 12% TOC in various places all over the world.…”

Section: Characteristic Of "Shale" Depositsmentioning

confidence: 99%

“…The latter usually have low or ultra low permeability (usually below 0.1 milidarcy [mD] (10 -16 m 2 ) [1,2]. Four major kinds of unconventional gas deposits are usually distinguished [3,4].…”

Section: Introductionmentioning

confidence: 99%

“…Unconventional gas deposits may also cover gas-condensate or purely gaseous deposits [8,9]. Determining two-phase zones is vital for gas-condensate deposits [3,10].…”

Section: Introductionmentioning

confidence: 99%

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Environmental Impact of Exploration from Unconventional Gas Deposits in Poland

Macuda

Konieczyńska

2015

Ecological Chemistry and Engineering S

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Shale formations have been recently treated only as source rocks and sealing packages mainly of conventional deposits. At present shales, which have a considerable concentration of highly mature organic matter appearing in complexes of over 30 m thick are used as unconventional sources for natural gas production with the use of advanced drilling technologies. Natural gas production in such rock formations necessitates performing a horizontal section in the borehole and a big number of hydraulic fracturing jobs. The unconventional shale gas deposits have been prospected also in Poland for a couple of years. Exploration works mainly concentrate on a vast area passing from Pomerania through Mazowsze to the Lublin region in Poland. The analysis of the geologic analyses reveals that the most perspective are shales in the Lower Paleozoic at a depth of 2500 m in the eastern part to about 4000 m in the western part of the area. The paper is focused on the quantitative and qualitative evaluation of environmental impact of natural gas exploration works from unconventional deposits. Special attention was paid to the hydraulic fracturing jobs in shales, which create particular hazard for water and soil environment. These hazards already appear at the stage of preliminary works, when big quantities of chemicals and water for frac jobs are stored in the rig area, and then, during realization of works, when the spent hydraulic fracturing fluid may penetrate the water-bearing horizons in the caprock. The composition of fracturing fluid used in Gapowo B-1A well are given along with the results of chemical analyses of a few parts of spent fracturing fluid samples pumped out from the borehole. The fluid turned out to be high in salt (high specific electrolyte conductance (SEC) and total dissolved substances (TDS) and a high toxicity for most of the living organisms). For this reason the spent fracturing fluid should not enter the environment without control.

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Section: Characteristic Of "Shale" Depositsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Environmental Impact of Exploration from Unconventional Gas Deposits in Poland

Macuda

Konieczyńska

2015

Ecological Chemistry and Engineering S

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“…Natural gas is modeled as single component methane and the phenomena of change of PVT properties in the confined porous conditions (Nagy & Siemek, 2014) is not incorporated within the model. This is due to the fact the simulators use standard Peng-Robinson or Soave-RedlichKwong equation of state to model hydrocarbons PVT behavior (PREOS in this case).…”

Section: Simulation Model Descriptionmentioning

confidence: 99%

Key Factors in Shale Gas Modeling and Simulation

Klimkowski¹,

Nagy²

2014

Archives of Mining Sciences

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KEY FACTORS IN SHALE GAS MODELING AND SIMULATION MODELOWANIE I SYMULACJA NIEKONWENCJONALNYCH ZŁÓŻ GAZU ZIEMNEGO Z ŁUPKÓW -KLUCZOWE PARAMETRYMulti-stage hydraulic fracturing is the method for unlocking shale gas resources and maximizing horizontal well performance. Modeling the effects of stimulation and fluid flow in a medium with extremely low permeability is significantly different from modeling conventional deposits. Due to the complexity of the subject, a significant number of parameters can affect the production performance. For a better understanding of the specifics of unconventional resources it is necessary to determine the effect of various parameters on the gas production process and identification of parameters of major importance. As a result, it may help in designing more effective way to provide gas resources from shale rocks.Within the framework of this study a sensitivity analysis of the numerical model of shale gas reservoir, built based on the latest solutions used in industrial reservoir simulators, was performed. The impact of different reservoir and hydraulic fractures parameters on a horizontal shale gas well production performance was assessed and key factors were determined.

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“…In 2011 optimistic forecasts for shale gas reached Poland. EIA initially forecasted 5.3 Tcm of potential shale gas resources in 2011 [1,2], two years later predictions were verifi ed to 4.2 Tcm, now the exact resources are diffi cult to estimate due to poor recognition of the potential of these deposits [1]. Nevertheless these forecasts began development and preparations for unconventional natural gas exploration in Poland including the development of a new measurement methods for qualitative and quantitative analysis of natural gas composition.…”

Section: Introductionmentioning

confidence: 99%