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US 5,260,268 AGranted
Methods of drilling well boreholes and compositions used therein
AssigneeThe Lubrizol Corporation
InventorsJohn W. Forsberg, Richard W. Jahnke
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AssigneeThe Lubrizol Corporation
InventorsJohn W. Forsberg, Richard W. Jahnke
Estimating the term…
The present invention relates to a method comprising the steps of introducing into a well borehole a composition, comprising water and an amount, sufficient to reduce drilling torque, prevent sticking or twisting of a pipe during drilling, or release a stuck pipe in a well borehole, of (A) at least one reaction product of (A-1) at least one hydrocarbyl-substituted carboxylic acylating agent and (A-2) at least one amine-terminated polyoxyalkylene having a number average molecular weight from about 600 to about 10,000, or at least one salt of the reaction product, and drilling the well borehole. Drilling torque, twisting and sticking of the pipe during drilling and releasing of stuck pipe in a well borehole are all effectively controlled by the methods and compositions of the present invention.
A method, comprising the steps of:
A method, comprising the steps of:
A drilling fluid, comprising water, a clay, a density increasing agent, and (A) at least one reaction product of (A-1) at least one hydrocarbyl substituted carboxylic acylating agent selected from the group consisting of a succinic acylating agent, a Diels-Alder diacid, a dimer acylating agent, a tricarboxylic acylating agent, and mixtures thereof, wherein the acylating agents contain an average of about eight to about 40 carbon atoms, and (A-2) at least one amine-terminated polyoxyalkylene having a number average molecular weight from about 600 to about 10,000 or at least one salt of the reaction product.
Dependencies are inferred from the claim text.