Welford J.K.,Memorial University of Newfoundland |
Smith J.A.,BP Canada Energy Company |
Hall J.,Memorial University of Newfoundland |
Deemer S.,Memorial University of Newfoundland |
And 2 more authors.
Geophysical Journal International | Year: 2010
We present the results from processing and interpreting five lines from the 1992 Erable multichannel seismic reflection experiment extending from the southeastern margin of Flemish Cap into the northern Newfoundland Basin. These profiles reveal significant along strike variations in the rifting styles experienced by Flemish Cap. In the southwest, a 100-km-wide transition zone is identified between thinned continental crust and thin oceanic crust. Similar to the conjugate Galicia Bank and Iberian margins, this transition zone contains a section of deep basement adjacent to a series of shallower ridges and is interpreted as exhumed serpentinized mantle. Along strike towards the northeast, this transition zone pinches out completely within 100 km and is replaced by thin oceanic crust directly adjacent to thinned continental crust. By interpreting nearby seismic profiles and profiles on the conjugate margins using the same classification criteria, we construct regional maps of the distribution of crustal domains on both sides of the North Atlantic. These maps reveal significant variations in rifting style on the conjugate margins and along strike of each margin and also highlight the role of ancient transfer zones in compartmentalizing these rifting variations into four distinct regions. We propose that the limited localization of shallow topographically high serpentinized peridotite ridges on the Newfoundland-Iberia and Flemish Cap-Galicia Bank conjugate margins, was directly related to an increase in the rate of extension following the separation of Flemish Cap and Galicia Bank which exhumed deeper, less serpentinized mantle. © 2010 The Authors Journal compilation © 2010 RAS.
Alves P.,AP Dynamics Inc. |
Forcinito M.,AP Dynamics Inc. |
Xu J.,AP Dynamics Inc. |
Ferguson M.,AP Dynamics Inc. |
And 2 more authors.
Journal of Canadian Petroleum Technology | Year: 2010
The objective of this paper is the investigation and evaluation of the performance and life expectancy of a national pipe thread tapered thread (NPT) threaded connections as applied to a particular type of reciprocating compressor unit. The study focused on the assessment of the levels of excitation forces acting on the threaded connections and the resulting stress. These forces and stresses were determined from field vibration measurement results applied to a mechanical model of the system. As an extensive literature search did not yield satisfactory data for specific fatigue properties of NPT connections, we applied a first-principles approach to the problem and calculated the stress concentration factors from a detailed finite element study of the thread engagement under axial and circumferential loads. The results and details are reported here. Stress levels determined by this methodology were compared to the allowable fatigue limits for the piping and valves materials and a life expectancy was calculated. The same methodology can be applied to other situations involving threaded connections.
Bp Canada Energy Company and Amoco Canada Petroleum Company | Date: 2004-08-31
Pre-recorded audio and video cassettes containing information relating to safety; pre-recorded CD-ROMs containing information relating to safety; protective and safety helmets; safety goggles; protective clothing, namely, ear protectors, gloves, coveralls, safety shoes and boots, and hats; magnets. Posters; magazines, magazine columns, newsletters, and books all in the field of safety procedures in the petroleum industry; safety manuals for use in the petroleum industry; decals. Educational services, namely, conducting courses of training in safety procedures to be implemented while working in the petroleum industry. Providing information on safety procedures to be implemented while working in the petroleum industry by means of an interactive internet web site.
Jones J.,BP Canada Energy Company |
Chen A.,BP Canada Energy Company
Society of Petroleum Engineers - SPE Americas Unconventional Gas Conference 2011, UGC 2011 | Year: 2011
The Cadomin-Nikanassin (Cad-Nik) sandstone formations in the lower Cretaceous reservoirs along the reverse thrust faulting belt of North Eastern British Columbia, Canada, have emerged in the recent years as a new tight gas play. The low porosity (3% ∼ 6%) of the rock matrix controls gas storativity, while the presence of natural fractures in the form of clusters or swarms allows significant and sustainable flow rates for commercial productions. Newly drilled wells are commonly hydraulically fractured to establish or enhance wellbore connectivity to the natural fracture network. Seismic mappings of these structural unconventional gas reservoirs provide the early assessments of resource sizes and initial gas-in-place (IGIP), which usually bear huge certainties due to the difficulty of determining reservoir structural closures and pay porosity cutoffs. Regional analogue wells are often used to guide development decisions. Meanwhile estimating connected reservoir volumes through conventional gas material balances (P/Z vs. cum production) and production data analysis (RTA) has not been without challenges. Fairly long pressure buildups, on the order of 100's of hours, are often performed without seeing any pressure stabilization. The applicability of pressure extrapolation to these tests has not been systematically investigated. Thus, reliable average reservoir pressure estimates require much longer well shut-in times in order to perform meaningful gas material balance. Since this is not practical, confidence in material balance results requires a second, independent method for establishing connected well volumes to be used in comparisons and cross-checking. One possible choice is rate-transeint analysis (RTA) but, in these fields, many times well head pressure data are also unavailable or unreliable. This paper presents two field case studies, which demonstrate the successful application of the pressure-rate deconvolution approach combining a well's long, high quality production rate history with accurate downhole pressure data from relatively short buildup tests. This approach allows the reservoir engineer to (1) reconcile the performance based EUR estimates with the volumetric OGIPs, (2) establish, at least, minimum well drainage size and connected volume and (3) pick possible infill-drilling opportunities. A final benefit is that this often leads to a better understanding of well/reservoir parameters. Copyright 2011, Society of Petroleum Engineers.
Chen A.,BP Canada Energy Company |
Jones J.R.,BP Canada Energy Company
73rd European Association of Geoscientists and Engineers Conference and Exhibition 2011: Unconventional Resources and the Role of Technology. Incorporating SPE EUROPEC 2011 | Year: 2011
A number of successful case studies are presented in this paper to demonstrate the use of the pressure-rate deconvolution approach to estimating drainage areas for wells completed in some of the naturally fractured tight gas reservoirs of the Canadian Rockies Foothills. This study covers the application of deconvolution to two key carbonate stratigraphical horizons in the area: the Triassic Baldonnel and the Permo-Carboniferous Taylor Flat formations. Our original application of pressure-rate deconvolution was to wells in a major Cretaceous-aged sandstone member, the Cadomin-Nikanassin horizon. This process and results of this original application wil be documented and presented in a separate publication (Jones and Chen, 2011). In these structural plays, the matrix rock properties controlling the gas storativity of these formations are low with porosity between 3% and 6%. Correspondingly matrix rock permeability is also low with values between 0.01 and 0.1 md. However, all of these formations have been thrusted, overturned and have been subjected to reverse faulting. These diagentic factors have created swarms of natural fractures which control flow rates and may define rock volumes connected to individual wells. In each well, a pre-production short flow test for each is performed with the intent of ensuring acceptable flow rates and to scope facility design. At this stage of early development, initial gas in-place (IGIP) estimates are derived from geophysical mapping mainly with plans to calibrate this IGIP number through the application of gas material balance, rate-transient analysis and/or simple late-time rate decline. In recent years, the pressure-rate deconvolution approach has been successfully applied to many of these reservoir pools. The rate history data is available in the early stage of production, which is integrated with pressure buildup data collected later in the production life of a well during annual or routine, relatively short shut-in periods. Application of deconvolution in this paper is aimed at detecting early signs of pseudo-steady state pool depletion and to estimate the connected drainage volume. The case studies presented here compare the deconvolution drainage volumes with the estimates from volumetric IGIP, gas material balance, and rate-transient analysis. The procedures help calibrate and/or reconcile geoscience defined volumetric resource sizes, map remaining reserves and possible infill-drilling opportunities. Copyright 2011, Society of Petroleum Engineers.