公开(公告)号：US06703351B2

公开(公告)日：2004-03-09

申请号：US09785842

申请日：2001-02-16

申请人： Calvin Joseph Stowe, II ,  Ronald G. Bland ,  Dennis K. Clapper ,  Tao Xiang ,  Saddock Benaissa

发明人： Calvin Joseph Stowe, II ,  Ronald G. Bland ,  Dennis K. Clapper ,  Tao Xiang ,  Saddock Benaissa

IPC分类号： C09K702

CPC分类号： C09K8/24 ,  C09K8/12

摘要： A water-based drilling fluid having a polymer latex capable of providing a deformable latex film on at least a portion of a subterranean formation has been discovered to provide reduced drilling fluid pressure invasion when used to drill in shale formations for hydrocarbon recovery operations. A precipitating agent such as a silicate or an aluminum complex (e.g. sodium aluminate) is preferably used in conjunction with the polymer. Typically, the water present contains a salt to form a brine, often to saturation, although the invention may be practiced with fresh water. If a salt is employed, it is often helpful to additionally employ a surfactant, such as a betaine, for example.