Fluid loss control agent for aqueous wellbore fluids
AssigneeSchlumberger Technology Corporation
InventorsBalakrishnan Panamarathupalayam, Linus Sebelin
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Abstract
The present disclosure relates to fluid loss control agents for use in a water-based wellbore fluid. The fluid loss control agents generally include non-crosslinked copolymers of non-carboxylated monomers. The present disclosure also relates to water-based wellbore fluids containing the above fluid loss control agents and to methods of servicing a wellbore in a subterranean formation by placing the water-based wellbore fluids in the wellbore.
Claims18
A wellbore fluid comprising a water-based fluid and a latex comprising a non-crosslinked copolymer of non-carboxylated monomers selected from a compound having the formula (1):
- where R1 is a branched or unbranched alkyl group having from 1 to 30 carbon atoms and R2 is hydrogen or methyl;
- a compound having the formula (2)
- where R6 is an alkyl group having 1 to 4 carbon atoms;
- and a mixture thereof.
A wellbore fluid comprising:
- i) a water-based fluid;
- and
- ii) between about 2 lb/bbl of the wellbore fluid-10 lb/bbl of the wellbore fluid of a latex comprising a non-crosslinked copolymer of monomers selected from a compound having the formula (1):
- where R1 is a branched or unbranched alkyl group having from 1 to 30 carbon atoms and R2 is hydrogen or methyl;
- a compound having the formula (2)
- where R6 is an alkyl group having 1 to 4 carbon atoms;
- and a mixture thereof.
A method of modifying fluid loss properties of a wellbore fluid containing a water-based fluid, the method comprising the step of adding a latex comprising a non-crosslinked copolymer of monomers selected from a compound having the formula (1):
- where R1 is a branched or unbranched alkyl group having from 1 to 30 carbon atoms and R2 is hydrogen or methyl;
- a compound having the formula (2)
- where R6 is an alkyl group having 1 to 4 carbon atoms;
- and a mixture thereof to the wellbore fluid.
Dependencies are inferred from the claim text.