(METH)ACRYLIC COPOLYMERS AS RHEOLOGICAL ADDITIVES IN DRILLING FLUIDS AND DRILLING FLUIDS COMPRISING SUCH COPOLYMERS
First Claim
1. A drilling fluid in the form of a water-in-oil (W/O) emulsion comprising at least components (A) to (D), each being different from one another, namely(A) at least one hydrocarbon as continuous phase,(B) water or an aqueous solution of at least one organic and/or inorganic salt as discontinuous phase,(C) at least one weighting agent, and(D) at least one (meth)acrylic copolymer,wherein the (meth)acrylic copolymer (D) contains at least one of structural units (D1), (D2) and (D3), which are different from one another,structural unit (D1) comprising at least one hydroxyl group and not comprising any amino groups,structural unit (D2) comprising at least one amino group and not comprising any hydroxyl groups, andstructural unit (D3) comprising both at least one hydroxyl group and at least one amino group,and wherein the (meth)acrylic copolymer (D) further contains at least one structural unit (D4), which is different from any of structural units (D1), (D2) and (D3), structural unit (D4) containing the part structure (P)
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Accused Products
Abstract
The invention relates to a drilling fluid in the form of a water-in-oil (W/O) emulsion comprising at least components (A) to (D), wherein component (D) is at least one (meth)acrylic copolymer, which contains at least one of structural units (D1), (D2) and (D3) to introduce at least one hydroxyl and/or amino functionality into the copolymer and which further contains at least one structural unit (D4), a use of said (meth)acrylic copolymer as rheological agent in drilling fluids, which are water-in-oil (W/O) emulsions, as well as to a method of producing oil and/or natural gas or of preparing the production thereof comprising the step of using the inventive drilling fluid for generating and/or operating a drill hole.
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15 Claims
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1. A drilling fluid in the form of a water-in-oil (W/O) emulsion comprising at least components (A) to (D), each being different from one another, namely
(A) at least one hydrocarbon as continuous phase, (B) water or an aqueous solution of at least one organic and/or inorganic salt as discontinuous phase, (C) at least one weighting agent, and (D) at least one (meth)acrylic copolymer, wherein the (meth)acrylic copolymer (D) contains at least one of structural units (D1), (D2) and (D3), which are different from one another, structural unit (D1) comprising at least one hydroxyl group and not comprising any amino groups, structural unit (D2) comprising at least one amino group and not comprising any hydroxyl groups, and structural unit (D3) comprising both at least one hydroxyl group and at least one amino group, and wherein the (meth)acrylic copolymer (D) further contains at least one structural unit (D4), which is different from any of structural units (D1), (D2) and (D3), structural unit (D4) containing the part structure (P)
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13. A method of making a drilling fluid, the method comprising combining at least one (meth)acrylic copolymer as rheological additive with a drilling fluid, wherein the drilling fluid is a water-in-oil (W/O) emulsion and wherein the (meth)acrylic copolymer contains at least one of structural units (D1), (D2) and (D3), which are different from one another,
structural unit (D1) comprising at least one hydroxyl group and not comprising any amino groups, structural unit (D2) comprising at least one amino group and not comprising any hydroxyl groups, and structural unit (D3) comprising both at least one hydroxyl group and at least one amino group, and wherein the (meth)acrylic copolymer further contains at least one structural unit (D4), which is different from any of structural units (D1), (D2) and (D3), structural unit (D4) containing the part structure (P)
Specification