发明授权
- 专利标题: Use of mineral oils, hydrogenated polyalphaolefin oils and saturated fatty acids for breaking ves-gelled fluids
- 专利标题(中): 使用矿物油,氢化聚α-烯烃油和饱和脂肪酸来破坏凝胶液
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申请号: US11517688申请日: 2006-09-08
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公开(公告)号: US07347266B2公开(公告)日: 2008-03-25
- 发明人: James B. Crews , John R. Willingham
- 申请人: James B. Crews , John R. Willingham
- 申请人地址: US TX Houston
- 专利权人: Baker Hughes Incorporated
- 当前专利权人: Baker Hughes Incorporated
- 当前专利权人地址: US TX Houston
- 代理机构: Madan Mossman & Sriram PC
- 主分类号: E21B43/27
- IPC分类号: E21B43/27
摘要:
Fluids viscosified with viscoelastic surfactants (VESs) may have their viscosities reduced (gels broken) by the direct or indirect action of a breaker composition that contains at least one mineral oil, at least one polyalphaolefin oil, and/or at least one saturated fatty acid. The breaker may initially be dispersed oil droplets in an internal, discontinuous phase of the fluid. In one non-limiting embodiment, the breaker, e.g. mineral oil is added to the fluid after it has been substantially gelled. The breaking composition is believed to act possibly by rearranging, disaggregating or otherwise attacking the micellar structure of the VES-gelled fluid in a non-spontaneous, rate controlled manner at elevated fluid temperatures. In a specific, non-limiting instance, a brine fluid gelled with an amine oxide surfactant can have its viscosity broken with a light, low viscosity paraffinic mineral oil.
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