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1. 发明授权

US5366016A Use of variable density carrier fluids to improve the efficiency of scale dissolution 失效
标题翻译：使用可变密度载体流体来提高垢溶解的效率
公开(公告)号：US5366016A
公开(公告)日：1994-11-22
申请号：US164861
申请日：1993-12-10
申请人： Eleanor R. Fieler , Alfred R. Jennings, Jr. , James M. Paul
发明人： Eleanor R. Fieler , Alfred R. Jennings, Jr. , James M. Paul
IPC分类号： E21B37/00 , C09K8/528 , E21B37/06 , E21B43/28
CPC分类号： E21B37/06 , C09K8/528
摘要： A method to improve the efficiency of scale dissolution in a formation containing multiple productive intervals where variable density liquids are utilized. Initially, a liquid composition sufficient to solubilize an alkaline-earth metal sulfate scale deposit is directed into a wellbore thereby contacting scale in one productive interval of the formation. Thereafter, a second scale solubilizing liquid having a density of about 0.1 wt % less than the first liquid is directed into the wellbore thereby contacting additional perforations and a higher interval. These scale solubilizing liquids with varying densities are allowed to remain in contact with perforations and productive intervals communicating therewith for a time sufficient to solubilize the scale deposit thereby efficiently removing said scale deposit from perforations and productive intervals at two different levels.
摘要翻译：一种提高含有可变密度液体的多个生产间隔的地层中的水垢溶解效率的方法。最初，将足以溶解碱土金属硫酸盐垢沉积物的液体组合物导入井筒，从而在地层的一个生产间隔中接触氧化皮。此后，具有比第一液体小约0.1重量％的密度的第二比例增溶液被引导到井眼中，从而接触另外的穿孔和更高的间隔。允许具有不同密度的这些规模增溶液体与穿孔和与其连通的生产间隔保持接触足以溶解垢垢的时间，从而有效地从两个不同水平的穿孔和生产间隔去除鳞屑沉积物。

2. 发明授权

US5377758A Method for effective placement of a long life scale inhibitor 失效
标题翻译：有效放置长寿命抑制剂的方法
公开(公告)号：US5377758A
公开(公告)日：1995-01-03
申请号：US55594
申请日：1993-05-03
申请人： Eleanor R. Fieler , John Hen , Alfred R. Jennings, Jr.
发明人： Eleanor R. Fieler , John Hen , Alfred R. Jennings, Jr.
IPC分类号： C09K8/528 , E21B37/06 , E21B43/14 , E21B41/02 , E21B43/25
CPC分类号： E21B43/14 , C09K8/528 , E21B37/06 , Y10S166/902
摘要： A method for placement of a long life scale inhibitor into a formation where variable density scale inhibitors are utilized. A substantially low density non-reactive fluid is loaded into an interval of the formation to be treated. Afterwards, a high density first stage scale inhibitor is injected into the interval. Thereafter, a low density spacer fluid is injected into the interval being treated. Next, a second stage high density scale inhibitor having a density lower than the first stage inhibitor is injected into said interval. Subsequently, a low density spacer is injected into the interval. Volume increments are repeatedly injected with decreasing fluid densities until a desired zone has been treated. The entire treatment is then overflushed with an inert high density fluid. Use of this method allows even inhibitor distribution in intervals of a formation with permeability variations thereby preventing scale build-up.
摘要翻译：将长寿命抑制剂放置在使用可变密度垢抑制剂的地层中的方法。将基本上低密度的非反应性流体加载到要处理的地层的间隔中。之后，将高密度的第一级阻垢剂注入间隔。此后，将低密度间隔液注入到待处理的间隔中。接下来，将具有低于第一级抑制剂的密度的第二级高密度阻垢剂注入所述区间。随后，将低密度间隔物注入间隔区。体积增量以降低的流体密度重复注入，直到所需的区域被处理。然后用惰性高密度流体将整个处理过度冲洗。这种方法的使用允许均匀的抑制剂分布在具有渗透率变化的形成的间隔中，从而防止结垢。

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