IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0880592
(2001-06-13)
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발명자
/ 주소 |
- McGregor, William M.
- Fomara, Dario
- Pellizzon, Tullio
- Bassi, Giuseppe Li
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출원인 / 주소 |
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대리인 / 주소 |
Madan, Mossman & Sriram, P.C.
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인용정보 |
피인용 횟수 :
13 인용 특허 :
10 |
초록
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Disclosed is a process for cleaning wellbore walls, tubing or casings. The process is characterized by (a) preparing an aqueous surfactant composition containing from about 10% to 60% by weight of a mixture of surfactants, the mixture comprising from 10% to 50% by weight of an anionic derivative of
Disclosed is a process for cleaning wellbore walls, tubing or casings. The process is characterized by (a) preparing an aqueous surfactant composition containing from about 10% to 60% by weight of a mixture of surfactants, the mixture comprising from 10% to 50% by weight of an anionic derivative of an alkylpolyglycoside, from 35% to 80% by weight of an alkylpolyglycoside and from 5% to 25% by weight of an anionic derivative of a fatty alcohol, their balance being 100%; (b) diluting the aqueous surfactant composition in water to form a diluted aqueous surfactant composition and injecting the diluted aqueous surfactant composition into a wellbore containing drilling mud, oily residues or other undesirable deposits; (c) extracting from the wellbore the diluted aqueous surfactant composition containing the drilling mud, oily residues or other undesirable deposits; (d) removing the drilling mud, oily residues or other undesirable deposits from the diluted aqueous surfactant composition; and (e) optionally, re-using the diluted aqueous surfactant composition.
대표청구항
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1. A process for cleaning a wellbore wall, tubing or casing using a turbulent flow regime characterized by: a) preparing an aqueous surfactant composition containing from about 10% to 60% by weight of a mixture of surfactants, the mixture comprising from 10% to 50% by weight of an anionic derivat
1. A process for cleaning a wellbore wall, tubing or casing using a turbulent flow regime characterized by: a) preparing an aqueous surfactant composition containing from about 10% to 60% by weight of a mixture of surfactants, the mixture comprising from 10% to 50% by weight of an anionic derivative of an alkylpolyglycoside, from 35% to 80% by weight of an alkylpolyglycoside and from 5% to 25% by weight of an anionic derivative of a fatty alcohol, their balance being 100%; b) diluting the aqueous surfactant composition in water to form a diluted aqueous surfactant composition and injecting the diluted aqueous surfactant composition into a wellbore containing drilling mud, oily residues or other undesirable deposits; c) extracting from the wellbore the diluted aqueous surfactant composition containing the drilling mud, oily residues or other undesirable deposits; and d) removing the drilling mud, oily residues or other undesirable deposits from the diluted aqueous surfactant composition. 2. The process according to claim 1, wherein the aqueous surfactant composition of point a) is diluted at from 1% to 10% by weight in viscosified water. 3. The process according to claim 1, wherein the aqueous surfactant composition contains from about 20% to about 50% by weight of a mixture of surfactants. 4. The process according to claim 3, wherein the mixture of surfactants comprises from 15% to 45% by weight of an anionic derivative of an alkylpolyglycoside, from 40% to 75% by weight of an alkylpolyglycoside and from 8% to 15% by weight of an anionic derivative of a fatty alcohol, their balance being 100%. 5. The process according to claim 4, wherein respectively the anionic derivatives of alkylpolyglycosides, the alkylpolyglycoside and the anionic derivative of fatty alcohol are represented by the formulae I, II and III: I. [R--O--(G)x]n--(D)y II. R--O--(G)x Ill. R--O--D wherein: R is an aliphatic group, saturated or unsaturated, linear or branched, having from 6 to 20 atoms of carbon; G is a residue of a reducing saccharide, connected to R--O by means of an ethereal O-glycosidical bond; O is an oxygen atom; D is an acyl residue of a sulfosuccinic acid or of a carboxylic acid selected from the group consisting of citric acid, tartaric acid, maleic acid, malic acid, and mixtures thereof; n is a number between 1 and m-1, where m is the number of carboxylic groups in the acid that originates D; x is a number from 1 to 10, representing the average degree of oligomerization of G; and y is a number from 1 to 10 representing the degree of average esterification of (G)x. 6. The process according to claim 5, wherein in formulae I, II and III, R has from 8 to 16 atoms of carbon. 7. Process according to claim 5, wherein in formulae I and II, G is a residue of glucose. 8. The process of claim 1 additionally comprising e) re-using the diluted aqueous surfactant composition.
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