Comparative Study of Coal Seam Gas Production Forecasting Methodologies: Detailed Analysis of Benefits and Drawbacks of Numerical Simulation, Analytical Models and a New Hybrid Approach

2019 ◽  
Author(s):  
Isan Sugiarto ◽  
Zheng Kening ◽  
Saikat Mazumder
Keyword(s):  
Numerical Simulation ◽  
Coal Seam ◽  
Comparative Study ◽  
Detailed Analysis ◽  
Hybrid Approach ◽  
Gas Production ◽  
Analytical Models ◽  
Coal Seam Gas ◽  
Production Forecasting

Beneficial use of associated water in the Queensland coal seam gas industry

2010 ◽  
Vol 50 (2) ◽  
pp. 686
Author(s):  
Cristian Purtill
Keyword(s):  
Water Management ◽  
Coal Seam ◽  
Single Mode ◽  
Gas Production ◽  
Management Policy ◽  
Coal Seam Gas ◽  
Gas Industry ◽  
Beneficial Use ◽  
Challenges And Opportunities ◽  
Water Management Strategy

The Queensland Government has developed an associated water management policy that, among other things, strives to maximise the beneficial use of associated water derived from Queensland’s burgeoning coal seam gas industry. The Department of Infrastructure and Planning reports that domestic gas production alone (i.e. without an export LNG market) will produce on average 25 GL per annum in the next 25 years. Most of this water has sufficiently high total dissolved solids and other water quality issues to require some form of treatment prior to use. Clearly, the relatively large volumes of water present both challenges and opportunities to the communities in which the CSG industry is developing. In line with the philosophy of beneficial use of associated water, Santos has developed a portfolio of options within its associated water management strategy and plans for its Arcadia Valley, Fairview and Roma tenements. The strategy seeks to: provide enduring value for the community; maximise benefits while minimising the environmental footprint; provide a range of alternatives to avoid single-mode failure; use scalable options in response to uncertainty; deploy demonstrated technologies; and, meet and exceed all regulatory requirements. This paper will set some context around the broader CSG industry’s associated water challenges, and identify what parameters must be considered in arriving at beneficial uses for the water. The paper then explores some of Santos’ approaches to associated water management.

Determining the impacts of coal seam gas extraction on water-dependent assets

2016 ◽  
Vol 56 (2) ◽  
pp. 545
Author(s):  
David Post ◽  
Peter Baker ◽  
Damian Barrett
Keyword(s):  
Coal Seam ◽  
Indigenous Peoples ◽  
Rural Areas ◽  
Scientific Information ◽  
Gas Production ◽  
Specific Reference ◽  
Catchment Management ◽  
State Governments ◽  
Coal Seam Gas ◽  
Coal Resource

Many Australians, particularly in rural areas, are seeking clear scientific information about the potential impacts of coal seam gas production on groundwater and surface water across the country. In response to the resultant community concern, the Australian Government commissioned an ambitious multi-disciplinary program of bioregional assessments to improve understanding of the potential impacts of coal seam gas (and large coal mining) activities on water-dependent assets across six bioregions in eastern and central Australia. Delivered through a collaboration between the Department of the Environment, the Bureau of Meteorology, CSIRO, and Geoscience Australia—and including close engagement with natural resource management and catchment management organisations, coal resource companies, Indigenous peoples and state governments—the results will allow coal resource companies, governments, and the community to focus on the areas where impacts may occur so that these can be minimised. Key findings of the program will be presented with specific reference to the potential impacts on water-dependent assets due to CSG development by Metgasco and AGL in the Clarence-Moreton and Gloucester regions, respectively.

scholarly journals Study on Borehole Arrangement Methods for Gas Extraction by Hydraulic Slotting in Long-Distance Through-Coal Seam Tunnel

Geofluids ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Cunfang Zhu ◽  
Shuang Cai
Keyword(s):  
Numerical Simulation ◽  
Coal Seam ◽  
Simulation Models ◽  
Gas Production ◽  
Gas Extraction ◽  
Long Distance ◽  
Pressure Relief ◽  
Coal Deposits ◽  
Geological Conditions ◽  
Rapid Pressure

How to quickly eliminate outburst in long-distance through-coal seam tunnels is one of the major challenges faced by the tunnel industry in mountainous areas. Compared with coal mine rock crosscut coal uncovering, the work surrounding the rock of through-coal seam tunnels has a high degree of breakage, large cross-section of coal uncovering, and tight time and space. In this paper, a method of networked slotting in long-distance through-coal seam tunnels for rapid pressure relief and outburst elimination is proposed. Based on this method, the corresponding mathematical governing equations and numerical simulation models have been established. The optimal borehole arrangement spacing and the slot arrangement spacing obtained by numerical optimization are 2.85 m and 3.1 m, respectively. Field gas production data of through-coal seam tunnels show that compared with the traditional dense-borehole gas extraction, the method of networked slotting in long-distance through-coal seam tunnels for rapid pressure relief and outburst elimination can shorten the extraction time by about 66%, the net quantity of peak extraction is increased by 3.55 times, and the total quantity of gas extraction when reaching the outburst prevention index is increased by 1.26 times, which verifies the feasibility of this method and the reliability of numerical simulation results. This study could be used as a valuable example for other coal deposits being mined under similar geological conditions.

scholarly journals Mathematical modelling of gas production and compositional shift of a CSG (coal seam gas) field: Local model development

Energy ◽  
2015 ◽  
Vol 88 ◽  
pp. 621-635 ◽  
Author(s):  
Steven Psaltis ◽  
Troy Farrell ◽  
Kevin Burrage ◽  
Pamela Burrage ◽  
Peter McCabe ◽  
...  
Keyword(s):  
Coal Seam ◽  
Mathematical Modelling ◽  
Model Development ◽  
Gas Production ◽  
Local Model ◽  
Coal Seam Gas ◽  
Gas Field

Stochastic forecasting of production potential using customised type curves in coal seam gas

2010 ◽  
Vol 50 (2) ◽  
pp. 718 ◽  
Author(s):  
Georg Zangl ◽  
Shripad Biniwale ◽  
Andreas Al-Kinani ◽  
Vikram Sharma ◽  
Rajesh Trivedi
Keyword(s):  
Expert System ◽  
Coal Seam ◽  
Group Membership ◽  
Gas Production ◽  
Well Performance ◽  
Coal Seam Gas ◽  
Reservoir Properties ◽  
Type Curve ◽  
Probability Of Occurrence ◽  
Future Production

This paper discusses a new workflow to stochastically estimate the performance of future production in coal seam gas (CSG) developments. Usually performance evaluations for CSG wells are conducted using either much-generalised statistical methods or numerical simulation. Both approaches have significant drawbacks; the former methods are quick but very often lack accuracy, while the latter is very accurate however also usually highly complex in set-up and computation. The presented workflow is a new approach to well performance prediction that combines speed and reasonable accuracy. The workflow generates a set of key performance indicators of existing wells derived from historic dynamic data (water and gas production rates, pressures, etc.), static data (initial coal and reservoir properties, etc.) and predicted data (simplified production forecasts). The wells are then grouped according to the similarity of their KPIs. The production profiles of the wells within the same group are combined to a type curve that is described by the most likely production profile and an associated uncertainty range. A data-driven expert system is used to identify and capture the correlations of the parameters such as geographic locations, well spacing, reservoir properties and the group membership (equivalent to type curve). This expert system can then be applied to any location in the field in order to determine the most likely group membership of a potential well. The classification of a new well to a group is hereby not necessarily unique; the expert system might classify a new well into several groups and assign a probability of occurrence for each of the groups. A Monte Carlo routine is then applied to forecast the performance of the new well locations honoring the respective probability of occurrence of each type curve.

WATER AND THE COAL SEAM GAS INDUSTRY

2007 ◽  
Vol 47 (1) ◽  
pp. 369
Author(s):  
G. Scott ◽  
C. Ammundsen
Keyword(s):  
Coal Seam ◽  
Environmental Protection Agency ◽  
Poor Quality ◽  
Gas Production ◽  
End User ◽  
Protection Agency ◽  
Coal Seams ◽  
Coal Seam Gas ◽  
Gas Industry ◽  
Access To Water

Access to water is a significant issue in Queensland as much of the State continues to be affected by a prolonged drought. Coal seam gas production involves extracting water from coal seams to reduce the groundwater pressure that keeps the methane trapped in the coal. This process produces large volumes of water. Local councils, primary producers and industrial developers are potential end users of this water; however, if the water is of poor quality, it may be unsuitable for release in the environment and for other direct beneficial uses.This paper examines the complex legislative and regulatory hurdles that need to be overcome before any mutually beneficial agreement between the coal seam gas producer and end user may be completed. It also examines an operational policy recently released by the Queensland Environmental Protection Agency that proposes a framework for the regulation and management of water extracted from coal seams.

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