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dc.contributor.authorBrechan, Bjørn A.nb_NO
dc.date.accessioned2014-12-19T12:14:31Z
dc.date.available2014-12-19T12:14:31Z
dc.date.created2011-03-29nb_NO
dc.date.issued2010nb_NO
dc.identifier407053nb_NO
dc.identifier.urihttp://hdl.handle.net/11250/239371
dc.description.abstractHistorically, means of sand control have been utilized in hydrocarbon recovery since before 1930. Guide lines for establishing a successful design and installation have been developing as a function of experience and better understanding of the properties and requirements of the reservoirs to be drained. Sand control technology has developed to meet demands for draining increasingly more difficult reservoirs, e.g. at grater depths, unstable formations and with stacked contacts. New approaches have developed and with new technology, new experiences have been gained and the key elements for success in operation and production have been updated. Gravel packing sand screens is the most demandings and control technique with regards to planning, cost and time. When other methods are found in adequate or risk and consequence of failure to prevent sanding is found unacceptable, the choice in most cases will be gravel packed sand screens. Planning well design and deducting operational parameters for open hole gravelpack (OHGP) requires involvement of experienced specialists from several disciplines. Successfully installed and producing gravel packed screens depends on all elements in the previous and following sections to be successful. Every operation contains insecurities and hence, potential for deviation from established plans. Therefore, operational phase requires close follow up. Engineering software has been developed to support the most common calculations in planning and operation. Having one application containing the most essential well data can simplify and enhance engineering support. The software can support drilling operations, but it has been specialized for horizontal gravel packing. Seamless functions - all calculations use the same source for each section: well data and work string data – enabling calculations with minimal user effort: Torque and dragHydraulicGravel pack calculationsGravel pack simulations combining all operational parametersKick toleranceWell SchematicOther functions The quality and nature of the application can save time for engineering during planning and operation, especially for wells with open hole gravel pack. Planning wells that require gravel packing have some key elements that must be incorporated in the planning to ensure best chances for success. These key elements come from operational experience – what can practically done, what works and what fails. Hence, the industry use operational parameters often empirically deducted. The key elements are related to: the wellpath (trajectory), exposed formations properties, sizing of screens and gravel, gravel pack tool design, design of wash pipe (inner string), gravel pack design parameters (gravel feed, OH size, type of gravel, etc) and the properties of the drill-in fluid. The most central issue in horizontal gravel packing is the fluid velocity in the screen annulus. Most of the listed properties are there because of their influence on the fluid velocity. A robust well design must be made in the planning phase. Determining what is acceptable and not for the key elements and parameters must be acceptable for the drilling operation, production of the well and any well intervention. A well design for a typical subsea well has been discussed according to the industries practice for planning wells with OHGP. The operational parameters have been developed with the programmed application. The programmed application has been found suitable for planning and operational follow up through comparison with simulated and experienced data from 3 wells. However, several functions can be added to further develop time efficient planning and engineering support in the execution phase: Further develop intelligent routines for hydraulic calculations.Better plotting of T&D.Hydraulic: automatically incorporate gathered pressure loss data for motors and other components.Add more functions:Kick / well control calculations.Cement calculations.P&A calculations (free point, cement plugs, etc).Surge and swab.And other functionsnb_NO
dc.languageengnb_NO
dc.publisherNorges teknisk-naturvitenskapelige universitet, Fakultet for ingeniørvitenskap og teknologi, Institutt for petroleumsteknologi og anvendt geofysikknb_NO
dc.titleOperational Aspects of Sand Controlnb_NO
dc.typeMaster thesisnb_NO
dc.contributor.departmentNorges teknisk-naturvitenskapelige universitet, Fakultet for ingeniørvitenskap og teknologi, Institutt for petroleumsteknologi og anvendt geofysikknb_NO


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