[특허]Method of cementing

Method of cementing 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	C04B-007/35
출원번호	US-0768005 (1977-02-11)
발명자 / 주소	Stude Duane L. (Tulsa OK)
출원인 / 주소	The Dow Chemical Company (Midland MI 02)
인용정보	피인용 횟수 : 52 인용 특허 : 0

초록 ▼

A cement composition is provided containing portland cement; calcium sulfate hemihydrate; urea; one or more retarders selected from the group consisting of a water soluble salt of a lignosulfonic acid, a low molecular weight hydroxypolycarboxylic acid and sodium, potassium, and lithium salts thereof, and an alkaline hexametaphosphate; and as optional ingredients, calcium chloride and/or a condensation product of mononaphthalene sulfonic acid and formaldehyde; said ingredients being present in amounts effective to provide a cement which will set within a desired period of time at temperatures below about 80°F down to below freezing, e.g. 32°F, to provide a monolithic mass having adequate strength and which also has a sufficient pumping time, i.e., setting time, at higher temperatures, i.e., above about 80°F, so that it can be transported, i.e., pumped at such elevated temperatures without prematurely setting up.

대표청구항 ▼

A method of cementing in the low temperature zone of an environment having a low temperature zone below about 80°F, which comprises: 1. providing a slurry comprising portland cement and the calcium sulfate hemihydrate form of gypsum in a weight ratio of from 3:1 to 1:3 and, based on the total weight of said portland cement and gypsum, a. from about 5 to about 25 percent urea, b. from about 0.1 to about 2 percent of at least one retarder selected from the group consisting of i. a water soluble salt of lignosulfonic acid, ii. a low molecular weight hydroxypolycarboxylic acid, iii. a sodium, potassium, or lithium salt of a low molecular weight hydroxypolycarboxylic acid, and iv. an alkaline hexametaphosphate, and c. from about 25 to about 50 percent water; 2. transporting said slurry to said low temperture zone; and 3. permitting the slurry to set up in said low temperature zone.

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