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formate brine cesium formate potassium formate formate brines drilling fluid walk lands end drilling well completion hpht well cesium formate brine hpht drilling john downs completion fluid lejog shale drilling potassium formate brine john o'groats cornwall hpht shell gas well formate shell research devon newsletter formate matters shale launceston cesium heavy brine well logging shale stabilisation somerset well drilling deep gas completion reservoir drill-in lands end to john o'groats (lejog) lands end to john o'groats gas production well workover sodium formate shale gas barite penzance workover fluid cesium acetate tealby cesium acetate brine shell uk shale drilling fluid tame gas spe paper drilling muds shale inhibitor formate production clouding glycol formate powder petroform addcon drilling fluids rop well completion fluid offshore wells tune field long horizontal open hole completion horizontal wells well morchard bishop bondleigh okehampton unconventional gas reserves minions townshend four lanes truro st stephen bodmin wellbore stability walk cornwall lands end john o'groats lejog ramble hse oil well shale oil environment st neot oil-based fluid oil-based mud faster drilling osmotic power knights templar chevron encana history of tealby 1992 slimhole shale swelling workover shale stability 22cr calcium bromide cracking 13cr corrosion cra stress corrosion cracking chloride ecology safety well start-up production start-up well suspension completion brine horizontal well drill-in low-solids oil-based fluid norway lsobm oil field offishore visund field templars garth temple temple garth tevelesbia enordet enorflo surfactant flooding steam flooding polymer flooding chemicals eor formates formate producer formate supplier carbon dioxide co2 scc bromide brine oxygen high temperature 25cr perforation bridestowe kvitebjorn field long-term production dog indie martin linge caseguard sustained casing pressure mitigation remedy chemix formate brine sustained casing pressure victoria day 6 day 4 ramble barium barite solubility toxicity salt solutions barite dissolution soluble barium draugen shellflo-s succinoglycan expandable sand screen north sea energy security uk gas cesium formate well productivity rhum field well perforating hpht wells 1993 spe 26699 protein single-cell protein single cell shell scp scp from methanol scp from methane methylococcus single cell protein methanol methane scp five crosses natural gas guide resistivity imaging limestone reservoir carbonate reservoir fractured carbonate micromax rijswijk sittingbourne rheometer inventor phil sturla william the conqueror merleswein lincolnshire england 1066 11th century 1086 tevelby lord of the manor tenants domesday book turbo-drilling turbine drilling tight gas sandstone mexico brine wbm obm mud rate of penetration cementing cement setting cement thickening clear brine spacer fluid well construction oi cement pumping cement spacer potassium formate manufacturer potassium formate producer potassium formate powder acetate brine shell expor glycol bw mud kittiwake field spe well imaging