Fluid compositions
First Claim
1. A drilling fluid composition of the invert oil-based type comprising a solid particulate material dispersed in an emulsion of an aqueous inorganic salt in an oil wherein there is incorporated(i) as the agent for emulsifying the aqueous phase in the oil phase an effective amount of a block or graft co-polymer of the general formula (A-COO)m B, where m in an integer of at least 2 and,(a) A is a polymeric component having a molecular weight of at least 500 and is the residue of an oil-soluble complex mono-carboxylic acid of the general structural formula:
- ##STR5## in which R is hydrogen or a monovalent hydrocarbon or substituted hydrocarbon group, R1 is hydrogen or a monovalent C1 to C24 hydrocarbon group, R2 is a divalent C1 to C24 hydrocarbon group, n is zero or 1 and p is zero or an integer of up to 200; and
(b) B is a polymeric component having a molecular weight of at least 500 and, in the case where m is 2, is the divalent residue of a water-soluble polyalkylene glycol of the general formula;
##STR6## in which R3 is hydrogen or a C1 to C3 alkyl group, q is an integer from 10 to 500, or, in the case where m is greater than 2, is the residue of valency m of a water-soluble polyether polyol of the general formula;
##STR7## in which R3 and m have their previous significance, r is zero or an integer from 1 to 500, provided that the total number of ##STR8## units in the molecule is at least 10, and R4 is the residue of an organic compound containing in the molecule m hydrogen atoms reactive with an alkylene oxide, and(ii) as the agent for dispersing the particulate solid in the oil phase an effective amount of a surfactant which is capable of becoming absorbed on to the surface of said particulate solid and is polyalk(en)yl succinic anhydride wherein the polyalk(en)yl group carries the succinic anhydride or succinic acid group terminally thereon and is a polymer of a C2 to C6 mono-olefin said polymer having a chain containing from 30 to 500 carbon atoms in the chain, or (2) the reaction product of said anhydride with a compound of polar character selected from an alcohol containing at least one hydroxyl group, a polyamine, an alkanolamine containing at least one hydroxyl and at least one amino group, compound containing a hydroxy group and a carboxyl group and a compound containing an amino group and a carboxyl group.
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Abstract
Drilling fluid compositions of the invert oil-based type incorporate (i) as the agent for emulsifying the brine phase in the oil phase, a block or graft copolymer of the general formula (A-COO)m B, where A and B represent polymeric components derived from a specified type of oil-soluble complex monocarboxylic acid and from a water-soluble polyalkylene glycol or polyether polyol, respectively, and m is an integer at least 2, and (ii) as the agent for dispersing solid particulate matter in the oil phase a surfactant containing a C30-500 hydrocarbon chain as hydrophobic component, and a polar component adsorbable on to the particulate solid surface.
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Citations
14 Claims
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1. A drilling fluid composition of the invert oil-based type comprising a solid particulate material dispersed in an emulsion of an aqueous inorganic salt in an oil wherein there is incorporated
(i) as the agent for emulsifying the aqueous phase in the oil phase an effective amount of a block or graft co-polymer of the general formula (A-COO)m B, where m in an integer of at least 2 and, (a) A is a polymeric component having a molecular weight of at least 500 and is the residue of an oil-soluble complex mono-carboxylic acid of the general structural formula: - ##STR5## in which R is hydrogen or a monovalent hydrocarbon or substituted hydrocarbon group, R1 is hydrogen or a monovalent C1 to C24 hydrocarbon group, R2 is a divalent C1 to C24 hydrocarbon group, n is zero or 1 and p is zero or an integer of up to 200; and
(b) B is a polymeric component having a molecular weight of at least 500 and, in the case where m is 2, is the divalent residue of a water-soluble polyalkylene glycol of the general formula;
##STR6## in which R3 is hydrogen or a C1 to C3 alkyl group, q is an integer from 10 to 500, or, in the case where m is greater than 2, is the residue of valency m of a water-soluble polyether polyol of the general formula;
##STR7## in which R3 and m have their previous significance, r is zero or an integer from 1 to 500, provided that the total number of ##STR8## units in the molecule is at least 10, and R4 is the residue of an organic compound containing in the molecule m hydrogen atoms reactive with an alkylene oxide, and(ii) as the agent for dispersing the particulate solid in the oil phase an effective amount of a surfactant which is capable of becoming absorbed on to the surface of said particulate solid and is polyalk(en)yl succinic anhydride wherein the polyalk(en)yl group carries the succinic anhydride or succinic acid group terminally thereon and is a polymer of a C2 to C6 mono-olefin said polymer having a chain containing from 30 to 500 carbon atoms in the chain, or (2) the reaction product of said anhydride with a compound of polar character selected from an alcohol containing at least one hydroxyl group, a polyamine, an alkanolamine containing at least one hydroxyl and at least one amino group, compound containing a hydroxy group and a carboxyl group and a compound containing an amino group and a carboxyl group. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
- ##STR5## in which R is hydrogen or a monovalent hydrocarbon or substituted hydrocarbon group, R1 is hydrogen or a monovalent C1 to C24 hydrocarbon group, R2 is a divalent C1 to C24 hydrocarbon group, n is zero or 1 and p is zero or an integer of up to 200; and
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12. A drilling fluid composition of the invert oil-based type comprising a solid particulate material dispersed in an emulsion comprising at least 30 parts by weight of an aqueous solution of an inorganic salt and up to 70 parts by weight of an oil wherein there is incorporated.
(i) as the agent for emulsifying the aqueous phase in the oil phase from 0.2 to 10% by weight of the aqueous phase of a graft co-polmer of the general formula (A-COO)m B, where m is an integer of at least 2, A is the residue of a poly(12-hydroxystearic acid) chain terminated with stearic acid and of molecular weight approximately 1750, and B is derived from polyethylene glycol of molecular weight approximately 1500, the said component B constituting approximately 30 percent by weight of the copolymer, and (ii) as the agent for dispersing the particulate solid in the oil phase from 0.1 to 10% by weight based on the particulate solid of a surfactant which is capable of becoming absorbed on to the surface of the particulate solid and is the reaction product of a poly(butenyl) succinic anhydride having an average molecular weight in the range of from 400 to 5,000, wherein the poly(butenyl) group carries the succinic anhydride residue terminally thereon, with a compound of polar character selected from an alcohol, a polyamine, an alkanolamine, a hydroxycarboxylic acid and an aminocarboxylic acid.
Specification