[특허]Acrylamide terpolymer shale stabilizing additive for low viscosity oil and gas drilling operations

Acrylamide terpolymer shale stabilizing additive for low viscosity oil and gas drilling operations 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	C09K-007/02
출원번호	US-0906560 (1992-06-30)
발명자 / 주소	Williamson C. Darwin (Sugar Land TX) Fong Dodd W. (Naperville IL) Gabel Robert K. (Sugar Land TX)
출원인 / 주소	Nalco Chemical Company (Naperville IL 02)
인용정보	피인용 횟수 : 59 인용 특허 : 0

초록 ▼

A low viscosity drilling fluid and method for stabilizing a downhole shale formation are disclosed. The fluid comprises an aqueous solution of a partialy transamidated hydrolyzed acrylamide copolymer, potassium chloride, a weighting agent and an optional viscosifying agent. The copolymer comprises from about 50 to about 98 mole percent primary amide functionality, from about 0.1 to about 15 mole percent secondary amide functionality and from about 2 to about 50 mole percent of the acrylate salt. The drilling fluid has a density out from about 8 to about 18 pounds per gallon and a viscosity of from about 5 to about 30 centistokes.

대표청구항 ▼

A method for stabilizing a downhole shale formation, comprising the steps of: (a) inverting a water-in-oil emulsion comprising a random hydrophobic acrylamide copolymer having the formula: [Figure] wherein R is a hydrogen or methyl group, M is hydrogen, an alkali metal, ammonium or amine group, and R′is an hydrocarbyl group having from 1 to about 6 carbon atoms, said inverted emulsion forming a polymer concentrate, wherein said (A) repeat units comprise from about 2 to about 50 mole percent of said copolymer, said (B) repeat units comprise from about 50 to about 98 mole percent of said copolymer and said (C) repeat units comprise from about 0.1 to about 15 mole percent of said copolymer; (b) preparing an aqueous drilling fluid comprising a sufficient amount of said concentrate to give a copolymer concentration of from about 0.04 to about 1.8 pounds per barrel, from about 5 to about 50 pounds per barrel of potassium chloride, and a weighting agent, wherein the drilling fluid has a density from about 8 to about 18 pounds per gallon and a viscosity from about 5 to about 30 centistokes; and (c) circulating said drilling fluid through a bore in the formation. An aqueous based drilling fluid suitable for stabilizing a downhole shale formation, comprising: (a) from about 0.04 to about 1.8 pounds per barrel of a random hydrophobic acrylamide copolymer having the formula: [Figure] wherein R is a hydrogen or methyl radical, M is hydrogen, an alkali metal, ammonium or amine cation, and R′is an hydrocarbyl radical having from 1 to about 6 carbon atoms, wherein said (A) repeat units comprise from about 2 to about 50 mole percent of said copolymer, said (B) repeat units comprise from about 50 to about 98 mole percent of said copolymer and said (C) repeat units comprise from about 0.1 to about 15 mole percent of said copolymer; (b) from about 5 to about 50 pounds per barrel of potassium chloride; (c) a weighting agent to provide a density from about 8 to about 18 pounds per gallon; wherein the fluid has a viscosity of from about 5 to about 30 centistokes.

이 특허를 인용한 특허 (59)

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Eoff,Larry S.; Dalrympre,Eldon D.; Reddy,B. Raghava; Zamora,Frank, Hydrophobically modified polymers for a well completion spacer fluid.
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Sierra, Leopoldo; Eoff, Larry S., Method useful for controlling fluid loss in subterranean formations.
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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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연합인증

Acrylamide terpolymer shale stabilizing additive for low viscosity oil and gas drilling operations 원문보기

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Acrylamide terpolymer shale stabilizing additive for low viscosity oil and gas drilling operations 원문보기

초록 ▼

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