... Abstract The operator's strategy is to maximise economic upstream gas production by drilling technically-mature sustaining wells in depleted areas of Surat basin in Queensland, Australia. To date the operator has drilled more than 2800 Coal seam gas wells with minimal well control issues...

... Abstract Walloons Coals of the Surat Basin, Queensland (Australia) contain world class Coal Seam Gas (CSG) plays, where permeability varies from high (>1Darcy), due to Gaussian curvature-related natural fracture connectivity, to low (<1mD) due to unidirectional fracture-systems attributed...

... of coal seam gas reservoirs. The model uses the conventional pseudo-3D treatment by which the vertically planar fracture is divided into cells along the horizontal direction. For each cell, the fracture deformation is represented by a 2D plane-strain fracture. To ensure numerical stability, the model uses...

... pair gas rate coal seam horizontal well productivity index Introduction Up to mid-2018, 41 single lateral SIS well pairs and 8 dual lateral SIS well pairs were successfully drilled, completed and produced. In addition, four multi-laterals wells drilled from a vertical mother bore with coil...

... Abstract This paper discusses the use of permanent Distributed Temperature Sensing (DTS) using optical fibres for flow zone allocation in Coal Seam Gas (CSG) production wells. In a commingled well the allocation of total well production to the multiple stacked reservoir units is extremely...

... Abstract Since the coal seam is soft with low permeability in China, the stimulation effect of vertical well hydraulic fracturing technology is limited while horizontal well fracturing has instable wellbore leading to wellbore collapsing. Therefore, floor horizontal well hydraulic fracturing...

... hydrochemistry and/or changes to an aquifer's water balance, an environmental breach has occurred. Figure 1 illustrates the well barriers and potential breach locations for an abandoned well and a producing coal seam gas (CSG) well. The conceptualisation of the probable reservoir-aquifer failure pathways...

... Abstract The operator’s exploration of natural gas in coal seams within the Gloucester Basin, New South Wales (NSW), Australia presents technical challenges accessing and producing the gas economically while meeting stringent environmental standards. These standards are more stringent than...

... Abstract Fairview field is located in the Bowen Basin in South East Queensland and covers an area of approximately 1600 km 2 . It has been in production since 1994, from the 6 main coal seams of the Bandanna Formation. Presently, about 150 wells are on-stream feeding the domestic gas market...

... the wellbore during drilling and, (iii) capture the vertical and lateral mechanical heterogeneity within specific coal seams. This paper focuses on practical solutions to model the borehole stability, in particular of the uncertainties in the rock strength modeling and coal heterogeneity. This innovative...

... blind pore. well logging pore structure china university complex reservoir shale gas reservoir coal seam upstream oil & gas tight gas sand coalbed methane reservoir relaxation time core sample log analysis gas production laboratory unimodal spectra reservoir transverse...

... Abstract The Diagnostic Fracture Injection Test (DFIT) is a welltesting technique used to assess the fracture growth, fracture closure and permeability from reservoirs; recently, it has been applied successfully to unconventional reservoirs such as: coal seams, tight sands and shale gas...

... Abstract Drill Stem Testing (DST) is a primary means of evaluating skin and permeability of exploration and appraisal wells. It is no exception in the case of Coal Seam Gas (CSG) reservoirs. A modified form of DST is routinely used by the CSG industry in this region (Queensland, Australia...

... with extensive coal seam gas development experience to pursue aggressive short term reserve growth targets. Plans were in place to install PCP completions in the vertical wells and tie the wells into a pre-installed water and gas gathering system as soon as the first horizontal well was drilled...

... the work of the author in published in1983 (SPE 12514). The approach presented is mathematically based with reference to field examples and laboratory work. These include measurements of stress and permeability. The application of the work is in establishing how the permeability of a coal seam will vary...

... Abstract In fluvio-deltaic sediments of East Kalimantan, Indonesia, coal commonly occurs and poses serious problems in reservoir evaluations. Thick coal seams can easily be identified, but it is often difficult to identify and quantify coal within sandstones using the conventional well logs...

... and completion strategies are further complicated by the presence of smectite and illite clays in the interseam sandstones and numerous thin volcanic tuff beds immediately below the main (basal) Baralaba coal seam. The field was discovered in 1994 after drilling the Peat -1 core well following a number of older...

... Abstract Three propped hydraulic fractures, placed in coal seams from vertical wells, were recently mapped as the coal mine workings passed through the site of the wells. The fractures were propped with sand and, in each case, the geometry of the propped fracture was mapped during mining...

... Abstract Relative permeability is a primary parameter for determining the reservoir behaviour of coal seams. We present numerous relative permeability curves measured in the laboratory as well as curves from numerically matching field performance. Viscous fingering provides an explanation...

... An integrated program of characterisation, stimulation, and post-stimulation trial production has been completed in three coal seams intersected by two HQ-size (96 mm diameter) boreholes located adjacent to Appin Colliery in NSW. Data on stress, seam permeability and pressure, formation mechanical properties...