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formate brine cesium formate potassium formate formate brines walk drilling fluid lands end well completion drilling hpht well cesium formate brine john downs hpht drilling lejog completion fluid shale drilling john o'groats potassium formate brine cornwall shell hpht gas well formate shell research devon shale newsletter launceston formate matters cesium heavy brine somerset well logging shale stabilisation lands end to john o'groats lands end to john o'groats (lejog) well drilling gas production completion reservoir drill-in deep gas formate production barite sodium formate shale gas well workover penzance townshend petroform formate powder addcon clouding glycol shale inhibitor spe paper tame drilling muds shale drilling fluid gas shell uk tealby cesium acetate brine cesium acetate workover fluid cesium caesium formate brine drilling fluids well completion fluid offshore wells tune field rop open hole completion long horizontal horizontal wells morchard bishop bondleigh okehampton well gas reserves hse wellbore stability truro st stephen bodmin four lanes walk cornwall lands end john o'groats lejog ramble oil well shale oil st neot environment unconventional minions tight gas sandstone oil-based fluid oil-based mud osmotic power slimhole faster drilling chevron shale swelling encana 1992 shale stability workover 25cr 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 history of tealby knights templar 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 five crosses natural gas guide 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 pollucite tanco cesium formate manufacturing 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 draugen spe well imaging 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 shellflo-s succinoglycan 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 perforation