Unconventional gas or tight shale-oil plays require a high density of wells and multistage hydraulic fracturing to economically develop. This leads to the use of high density well pads to reduce land costs, associated environmental impact and well delivery efficiency through batch drilling. A pad in Shell's North American assets of Groundbirch and Fox Creek (Canada), Appalachia, Permian and Eagleford (USA) can comprise of two opposing rows of 13 - 20 horizontal wells spaced three to six meters apart. Considering it takes an average of 14 days to drill a 5,000m well and a subsequent nine days to complete the multistage hydraulic fracturing sequence, a typical 26 well pad in the Grounbirch asset would take approximately two years from spud to first gas. Simultaneous Operations (SIMOPS) is defined as when two or more mutually exclusive activities take place within 50m of a wellbore, or each other. The activities are classified as critical and have to be carefully planned to ensure the safety of all personnel involved and comply with regulatory spacing stipulations. This paper aims to illustrate how Shell Canada implemented SIMOPS; further highlighting how rig operations were successfully co-ordinated during a restrictive weather period (melting snow and associated road bans) and how simultaneous completion operations were utilized to achieve eight hydraulic fracturing jobs, or ‘fracs’, a day, averaging 6.2 fracs/day over 13 wells.
TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractPetroleum Development Oman (PDO) is planning a major brown-field re-development project. For that reason a waterflood appraisal drilling campaign has been executed. Drilling through fractured reservoir sections causes drilling losses that have to be cured prior to liner cementation. Liner cementation in wells with severe or heavy drilling losses has had limited success despite novel loss curing materials.Expandable tubulars with swelling elastomer seals have been applied in 8 wells as an alternative to cemented liners with the objective to • Provide zonal isolation, to • Attempt time savings by eliminating loss curing and liner cementation and to • Slim down the well design.The reservoir sections of 2 vertical water injector wells and 6 vertical oil producer wells were drilled with losses and lined with expandable casing. Elastomer seals isolate the multiple reservoirs from each other. Expandable casing enables a slim oil producer design still using a 2 7/8" gaslift string. 4 slim wells were drilled. Zonal isolation has been created without cement. This novel approach to drill fractured carbonate reservoirs has proven technically feasible in terms of installation operations, zonal isolation and slimming down well designs. The paper describes the experience with expandable tubular technology for waterflood well delivery.
The installation of over 1000 ft of Expandable Sand Screen in a horizontal well has presented the most technically challenging application of the Expandable Tubular Technology (ETT) to date. With increasing emphasis on well economics in the current uncertain oil price regime, the optimization of well configurations, reduction of well construction costs, increase in well productivity and reduction in life cycle well maintenance expenses becomes critical to achieving business success. The paper presents the deployment of ETT, as an Expandable Sand Screen, in an application that impacts on all three economic factors; well costs, well productivity and life cycle well operating expenditure; positively in a single installation. It addresses numerous drilling, completion and productivity challenges to deliver the optimum drain hole (increased productivity) from a slimmer well (reduced well construction costs) with down-hole equipment that needs minimal re-entries and remedies, (reduced operating expenditure). With a vision to improve production in SPDC by 60% in the short term and by over 200% (to 2.5 MMbopd) by the year 2010, most new wells are completed horizontally with minimum potentials of 3000 bopd. The application of ESS in horizontal well was a novel challenge, with history of only four installations, the most challenging being the deployment of some 240ft of ESS in a 61° deviated well. This paper reviews the economic and technical justification for the deployment of the longest and first horizontal application of ESS in the World in Imo River 63 (Ex-SMTQ-5). It emphasizes on the planning, project management, risk assessment, and critical engineering considerations applied to assess the technical feasibility of deploying ESS in a horizontal well. The paper concludes with the highlights of the execution phase, ESS handling procedure, success, problems and recommendations from the field trial. Introduction With the current drive to increase production by over 60% within the current budget constraints, there is the need to reduce well construction cost without jeopardizing the well objective. Expandable Tubular Technology (ETT) is an economic way of achieving slender and monodiameter well design whilst retaining the regular production conduit sizes which directly result in substantial savings on casings, mud cost, cuttings management, cement volume handling and bit cost. With slim wells, improved rate of penetration, optimal operation of solids control equipment and lower capacity rig can be achieved with a resultant significant reduction in well cost. In cases where the well-cost advantage over a conventional design is marginal, maintenance of large bore for future re-entry will reduce maintenance cost over the life of the well. ETT can be utilized in all facets of well life; drilling, as an enabler to side-tracks, completion, well intervention and abandonment. This paper reviews the development and status of the EST to date, gives an overview of the economic and technical considerations affecting the success of the field trial, the planning, risk assessment and execution of the project. It highlights the running procedure, success, learning points, and recommendations as well as the future plans for the technology in SPDC. Review of Expandable Tubular Technology ETT can be classified into Expandable Slotted Tubular (EST) and Solid Tube Expansion (STE) technology(1).
TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractA new cost effective life-cycle profile control completion system has been developed to solve major problems associated with surveillance and interventions in horizontal and TAML level 2 multilateral wells completed with ESP. each other and can be selectively produced, shut-off or stimulated. The need for CT interventions for production logging and water shut-offs is removed. The water shut-off process offered by this technology is reversible.
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