Method of drilling with shale stabilizing mud system comprising polycyclicpolyetherpolyol
First Claim
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1. A method for enhancing the effectiveness of a calcium base drilling fluid to reduce cuttings dispersion and increase wellbore stability during the drilling of an oil or gas well, comprising:
- providing the components of a drilling fluid comprising solids, a fluid comprising water and a calcium compound in a concentration of from about 1 to 15 pounds per barrel of the fluid, said calcium compound being selected from the group consisting of lime, gypsum and mixtures thereof;
enhancing the effectiveness of the drilling fluid by admixing the drilling fluid components with (a) salt in a concentration of about 5 to 40% by weight of the fluid, said salt being selected from the group consisting of NaCl, NaBr, KCl, CaCl2, NaNO3, NaC2 H3 O2, KCHO2 and mixtures thereof, and (b) an alcohol in a concentration of from about 2 to 30% by weight of the fluid, said alcohol being a polycyclicpolyetherpolyol having a molecular weight Mw in excess of 50,000; and
reducing cuttings dispersion and increasing wellbore stability by drilling the wellbore with the enhanced calcium base drilling fluid and circulating the drilling fluid in the wellbore.
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Abstract
An aqueous base drilling fluid additive composed of salt and lime or gypsum, and including an acyclic polyol and/or cyclicetherpolyol and salt.
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Citations
5 Claims
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1. A method for enhancing the effectiveness of a calcium base drilling fluid to reduce cuttings dispersion and increase wellbore stability during the drilling of an oil or gas well, comprising:
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providing the components of a drilling fluid comprising solids, a fluid comprising water and a calcium compound in a concentration of from about 1 to 15 pounds per barrel of the fluid, said calcium compound being selected from the group consisting of lime, gypsum and mixtures thereof; enhancing the effectiveness of the drilling fluid by admixing the drilling fluid components with (a) salt in a concentration of about 5 to 40% by weight of the fluid, said salt being selected from the group consisting of NaCl, NaBr, KCl, CaCl2, NaNO3, NaC2 H3 O2, KCHO2 and mixtures thereof, and (b) an alcohol in a concentration of from about 2 to 30% by weight of the fluid, said alcohol being a polycyclicpolyetherpolyol having a molecular weight Mw in excess of 50,000; and reducing cuttings dispersion and increasing wellbore stability by drilling the wellbore with the enhanced calcium base drilling fluid and circulating the drilling fluid in the wellbore. - View Dependent Claims (2, 3, 4, 5)
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Specification
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Current AssigneeShell Oil Company (Shell Plc)
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Original AssigneeShell Oil Company (Shell Plc)
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InventorsHale, Arthur H., Blytas, George C.
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Primary Examiner(s)GEIST, GARY L
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Application NumberUS07/671,626Time in Patent Office966 DaysField of Search252/8.51, 252/8.511, 252/8.513, 252/8.514, 507/136, 507/139, 175/65US Class Current507/136CPC Class CodesC09K 8/22 Synthetic organic compounds
