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Well design, cementing techniques and well work-over to land deep production casings in the Menengai field

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dc.contributor Jarðhitaskóli Háskóla Sameinuðu þjóðanna is
dc.contributor.author Khaemba, Abraham Wamala is
dc.date.accessioned 2015-10-15T13:49:22Z
dc.date.available 2015-10-15T13:49:22Z
dc.date.issued 2015
dc.identifier.issn 1670-7427
dc.identifier.uri http://hdl.handle.net/10802/10522
dc.description Í: Geothermal training in Iceland 2014, s. 295-324 is
dc.description Myndefni: myndir, gröf, töflur is
dc.description.abstract Drilling has been ongoing at Menengai high temperature field since 2011. The wells are of regular well design with a 20" surface casing set at 60-70 m, 13⅜" anchor casing set at about 400 m depth and 9⅝" production casing set at between 800-1400 m. The intent is to drill the wells to a total depth of 2500-3000 m, with slotted 7" liners run to the bottom. All the casings used are grade K55, with threaded couplings. Data from offset wells drilled earlier have helped design the depth of the production casing in order to avoid cold inflows into the wells. Wells located at the centre of the field, which is at a higher elevation, have production casings set at about 850 m, while the production casings for other wells have been designed to be set deeper, down to 1400 m. is
dc.description.abstract With a good number of wells at the Menengai field having the production casing being set at 1400 m, this paper looks at: designing wells with a 9⅝" K55 production casing, slurry design and the most effective method for cementing the casings. Cementing methods that will be discussed include cementing with a cement head and plugs, two stage cementing, cementing with C-Flex RPL from the peak using the inner string method, reverse circulation cementing with an inner string and flap gate valve collar, and foam cementing. The paper looks at a number of wells which have already been completed. Pressure and temperature logs are analysed as well as the borehole geology to identify the cold inflow zones in wells already drilled. The remedial mechanisms available for sealing off the cold zones in completed wells are then researched and the most effective method to be applied at the Menengai field identified. The methods include use of External casing packer (ECP) and tie back design. is
dc.format.extent 30 s. is
dc.language.iso en
dc.publisher United Nations University is
dc.publisher Orkustofnun is
dc.relation.ispartofseries United Nations University., UNU Geothermal Training Programme, Iceland. Report ; 2014 : 17
dc.relation.uri http://os.is/gogn/unu-gtp-report/UNU-GTP-2014-17.pdf
dc.subject Jarðhiti is
dc.subject Borholur is
dc.subject Bortækni is
dc.subject Kenía is
dc.title Well design, cementing techniques and well work-over to land deep production casings in the Menengai field en
dc.title.alternative Geothermal training in Iceland en
dc.type Tímaritsgrein is
dc.identifier.gegnir 001402592


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