Fluid loss control agent for aqueous wellbore fluids
AssigneeSchlumberger Technology Corporation
InventorsBalakrishnan Panamarathupalayam, Linus Sebelin
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Abstract
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. Water-based wellbore fluids containing the above fluid loss control agents and methods of servicing a wellbore in a subterranean formation by placing the water-based wellbore fluids in the wellbore.
Claims16
A wellbore fluid comprising a water-based fluid, an emulsifier comprising paraffins in an amount between 10 lb/bbl to 40 lb/bbl of the wellbore fluid, a nonionic surfactant, and a latex comprising a non-crosslinked copolymer of non-carboxylated monomers comprising a compound of 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 of formula (2)
- where R6 is an alkyl group having 1 to 4 carbon atoms;
- and a mixture thereof;
- wherein the wellbore fluid is free of styrene or butadiene;
- wherein the amount of the copolymer present in the latex is about 40 weight % to about 50 weight %, based on the total weight of the latex.
A wellbore fluid comprising:
- i) a water-based fluid;
- ii) an emulsifier comprising paraffins in an amount between 10 lb/bbl to 40 lb/bbl of the wellbore fluid;
- iii) a nonionic surfactant, and
- iv) 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 comprising a compound of 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 of formula (2)
- where R6 is an alkyl group having 1 to 4 carbon atoms;
- and a mixture thereof;
- wherein the wellbore fluid is free of styrene or butadiene;
- wherein the amount of the copolymer present in the latex is about 40 weight % to about 50 weight %, based on the total weight of the latex.
Dependencies are inferred from the claim text.