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1. (US4836940) Composition and method of controlling lost circulation from wellbores

专利局 : 美国
申请号: 07095638 申请日: 14.09.1987
公布号: 4836940 公布日: 06.06.1989
授权号: 4836940 授权日: 06.06.1989
公布类型: A
国际专利分类:
C09K 8/50
C 化学;冶金
09
染料;涂料;抛光剂;天然树脂;黏合剂;其他类目不包含的组合物;其他类目不包含的材料的应用
K
不包含在其他类目中的各种应用材料;不包含在其他类目中的材料的各种应用
8
用于钻孔或钻井的组合物;用来处理孔或井的组合物,例如,用于完成或修复操作
50
涂抹井眼壁用的组合物,即用于暂时固结井眼壁的组合物
申请人: American Colloid Company
发明人: Alexander William
代理人: Mason, Kolehmainen, Rathburn & Wyss
优先权数据:
标题: (EN) Composition and method of controlling lost circulation from wellbores
摘要:
(EN)

A method and composition for controlling the lost circulation of drilling mud in a wellbore during a drilling operation comprising the introduction of a pelletized composition, comprising a water-insoluble, water-absorbent polymer and bentonite, in a weight ratio of water-absorbent polymer to bentonite in the range of from about 9:1 to about 1:9, and preferably in the range of from about 3:1 to about 1:3, into the wellbore to reduce or eliminate drilling mud loss by sealing porous subterranean formations. The pellets essentially maintain their original size as the pellets pass through the wellbore to the site of lost circulation. At the site of lost circulation, the pellets accumulate, absorb water and swell to form an essentially fluid-tight plug. The porous subterranean formation is thereby sealed and further loss of drilling mud is prevented.