Fluids and techniques for hydrocarbon well completion
AssigneeSchlumberger Technology Corporation
InventorsMark E. Brady, Wayne W. Frenier, Palathinkara S. Vinod
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Abstract
The Invention relates to novel fluids and techniques to optimize/enhance the production of hydrocarbon from subterranean formations (e.g., “completion fluids”), in particular, fluids and techniques are disclosed and claimed which remove wellbore damage and near-wellbore damage in the form of coating formed from drilling and production-related operations (“filtercake”); the techniques can be applied either by themselves or in conjunction with other completion operations, such as gravel packing; preferred embodiments are chelating agent and enzyme systems in a viscoelastic surfactant (VES) matrix.
Claims19
A well completion fluid for breaking filtercake comprising VES, an enzyme, and a chelating agent, wherein said enzyme is selected from the group consisting of α-amylase and β-amylase and wherein said viscoelastic surfactant has the formula RCONHC3H6N+(CH3)2CH2COO−, wherein R is an alkyl group containing from 12 to 22 carbons, saturated or comprising one olefin unit.
A well completion fluid for breaking filtercake comprising VES, an enzyme, and a chelating agent wherein said VES is N-cis-13-docosenoic-N,N-bis(2-hydroxymethyl)-N-methyl ammonium chloride, and wherein said enzyme is selected from the group consisting of α-amylase and β-amylase, and wherein said chelating agent is selected from the group consisting of hydroxyethylethylenediaminetriacetic acid (HEDTA) and hydroxyethyliminodiacetic acid (HEIDA).
A well completion fluid for breaking filtercake comprising formic acid and an aqueous solution of hydroxyethyliminodaicetic acid (HEIDA) as chelating agent, present in said fluid in concentrations between about 10% and about 80% by volume where said chelating agent is about 40% to about 41% weight active.
Dependencies are inferred from the claim text.