Design and Construction of an Artificial Island for Petroleum Production in the Beaufort Sea PDF Download
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Languages : en
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Languages : en
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Author: Swan Wooster Engineering Co
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Category : Artificial islands
Languages : en
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"The following report presents the findings of a feasibility study, authorized by Gulf Oil Canada Limited (GOCAN) in March of 1977, to investigate the possibility of constructing an artificial island for the production of hydro-carbons in 95ft. of water in the Beaufort Sea, NWT. In order to provide a practical base for the study, the 1976 exploration drill site at Tingmiark was chosen by GOCAN as a site with environmental and soil characteristics representative of possible future hydro-carbon production sites in the general area. The project team chosen to perform the study consists of Swan Wooster Engineering Co. Ltd. (Swanco) to provide the civil engineering, Golder Brawner and Associates Ltd. (Golder Associates) to provide the geotechnical engineering, and Northern Construction Company to provide the contracting expertise and cost estimates. The scope of work involved in the study was divided into three tasks or sub-sections. Task 1, the First Stage, consisted of an initial or conceptual design stage of three Concept Islands based on design concepts proposed by Gocan, assessment of the methods of analysis and review of sources of materials and equipment. Task 2, the Second Stage, consisted of performing the analysis of wave and current scour and soil resistance to ice attack on modified versions of the Concept Islands. Task 3, or the Third Stage of the study, consisted of the finalization of the Concept Islands, a more comprehensive assessment of normal ice regime and ice rubble participation, finalization of the equipment construction schedules and cost estimates for capital and maintenance costs. ... The findings of this feasibility study indicate that Concept Island 2B (revised) would be more suitable for location in the 95ft. water depth of the Beaufort Sea than Concept Island 1 .... A feasibility study of this nature involving building an artificial island in 95ft. of water, twice the water depth attempted to date, and in the shear ice zone 50 miles offshore and beyond the present experience with island construction in the land-fast ice zone, is bound to turn up many areas requiring further study. A number of these are listed in the final Section 15 as considerations for ongoing studies"--ASTIS database.
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Languages : en
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"A production facility is being considered for the extraction of oil from the Kopanoar Field in the Canadian Beaufort Sea where water depths are approximately 60 metres (200 ft). Various types of structures are being contemplated. These include primarily two different types, namely a standard artificial island with berms and caissons, and a gravity structure with berms for ice load protection. A major obstacle to the design of either type of facility is a very soft upper seabed clay stratum approximately 6 metres (20 ft) thick. This feasibility design study addresses primarily the aspects of an artificial island stability related to the foundation soil conditions. The objectives were to obtain a geotechnically sound and economically feasible conceptual design, and to evaluate other possible designs that could be constructed with equipment presently available to Dome Petroleum Ltd. in the Beaufort Sea. These objectives have been met. ... The conclusions of this feasibility study may be summarized as follows: 1. The artificial island would be unstable if founded on 6 m (20 ft) of very soft seabed clays unless it was constructed slowly over a period of many years. 2. Vertical drains used below the entire island to reduce consolidation time would be uneconomical for this project. In addition, an extended construction period would be required to allow time for sufficient strength gain in the very soft seabed clays. 3. Partial removal of the very soft seabed clays would also necessitate an extended construction period. 4. Key soils and field testing data are required to quantitatively assess the potential benefits of dynamic consolidation on stability. 5. Fill displacement methods of construction may result in sand intrusions within the very soft seabed soils or displacement of these soils. Field test data are required to evaluate this construction procedure. 6. The optimum design would involve removal of the very soft seabed clays from approximately berm crest to berm crest, beneath the island core. Additional soils data are required to determine the precise extent of removal. 7. The potential for berm toe instability is not believed to be a serious impediment to the feasibility of the artificial island, but needs further investigation. 8. The findings reported herein are based on the limited soil data currently available in the region of the proposed Kopanoar Island. When a precise location has been selected and site-specific geotechnical testing carried out, it may be possible to optimize the design of the island. The present study is based on a realistic interpretation of the regional conditions, but because of the limited data currently available it is necessarily conservative"--Executive summary.
Author: Stearns-Roger Canada Ltd
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Category : Artificial islands
Languages : en
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"Stearns-Roger Ltd. is best qualified to carry out the Safety Study for the Beaufort Sea Artificial Islands Facilities for Dome Petroleum for the following reasons: The combined expertise of our team in safety, training, Arctic experience, drilling, production operations and other disciplines enables us to identify hazards, plan for evacuation, survival and rescue from an offshore facility, complete Phases II and III, make recommendations for further study and plan necessary research programs. Stearns-Roger experience in Kuparuk, Alaska, Parsons Lake and Norman Wells, N.W.T. gives us the background in design and safety factors to produce the Engineering Safety Manuals for Arctic design and operations. Our Drilling and Production Safety Consultant has over 35 years experience in safety, training, oil production and drilling in Western Canada, and the Arctic. Our subcontractors, Tower-Watt, incorporates some of the most widely respected experience in North America in operations in the high Arctic, having executed over 1000 projects in the Arctic since 1946. They have marine structural experience applied to recent developments in Alaska and Arctic Canada. The study will be carried out from our Calgary office"--Leaf [i].
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Category :
Languages : en
Pages : 470
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Author: Imperial Oil Enterprises
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Languages : en
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Discusses proposed Imperial Oil activities in the Mackenzie Delta - Beaufort Sea area.
Author: Fenco Consultants Limited
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Category : Beaufort Sea
Languages : en
Pages :
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"Dome Petroleum Ltd. is planning to construct the first of their artificial islands in the Beaufort Sea sometime during the late summer or early fall of this year. The proposed island will be located offshore in a water depth of 23m and consists of four self contained caissons placed on a dredged soil berm. The intended use of the island is twofold, namely, to use it as a platform for explorational drilling as well as to employ it as a full scale experimental structure which offers the unique opportunity to measure undistorted ice forces and ice pressures. Data gathered from this structure can then be utilized to establish design criteria for the construction of future islands located in greater water depths. The work outlined in this proposal relates mainly to the experimental nature of this island. So called false front pressure panels which are made out of steel and/or concrete are attached to the front face of the caisson(s) as shown in Figure 1. The configuration of a typical panel consists of a structurally sound plate and beam structure which transmits ice loads via load cells or flat jacks to the caisson. Overall average normal and/or shear loads are measured by the cells or jacks whereas localized stress concentrations are measured by employing sensing devices which are either built into the panel or are directly attached to the panel surface. The panels have to be anchored to the caisson. The anchor points have to be designed with great care in order to ensure that all possible loads are being properly transferred" -- ASTIS [online] database.
Author: Komex Consultants Ltd
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Category : Beaufort Sea Coast (Yukon)
Languages : en
Pages :
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Author: D. H. Garratt
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Languages : en
Pages : 8
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Author: P. J. Dingle
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Languages : en
Pages : 18
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Book Description
Paper presented to the World Dredging Conference, Vancouver, October 29-31, 1980. Describes the construction of artificial islands for exploration and development of oil and gas resources in the Beaufort Sea.
