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    • 7. 发明授权
    • Provision of viscous compositions below ground
    • 提供低于地面的粘性组合物
    • US08517102B2
    • 2013-08-27
    • US12738853
    • 2008-11-26
    • Philip SullivanGary TustinYenny ChristantiGregory KubalaBruno DrochonTrevor Hughes
    • Philip SullivanGary TustinYenny ChristantiGregory KubalaBruno DrochonTrevor Hughes
    • E21B43/22
    • C09K8/514C09K8/501C09K8/508C09K8/52C09K8/5751C09K8/588C09K8/68C09K8/88
    • A thickened aqueous composition is delivered to a subterranean location accessible via a wellbore by steps of i. providing a biphasic aqueous mixture comprising two aqueous solutions which, at surface temperature and pressure, are able to co-exist as separate aqueous phases in contact with each other, ii. pumping said biphasic aqueous system down the wellbore to the subterranean location, and iii. converting the biphasic mixture below ground so that its phases combine into a single aqueous phase which is more viscous than the biphasic mixture. The two phases of the aqueous biphasic mixture contain dissolved solutes which segregate between the two phases such that at least one first solute is present at a greater concentration in the first aqueous phase than in the second aqueous phase while at least one second solute is present at a greater concentration in the second aqueous phase than in the first aqueous phase. The solute in the first phase may be a thickening polymer or other thickening material such as viscoelastic surfactant. The solute in the second phase may be a different polymer, surfactant or salt. Conversion to a single phase may be carried out in various ways including dilution, change in pH, change in salinity, increase in temperature and adsorption of one solute onto formation rock.
    • 增稠的水性组合物被递送到通过i的步骤可通过井筒接近的地下位置。 提供包含两种水溶液的双相含水混合物,其在表面温度和压力下能够作为彼此接触的分离的水相共存,ii。 将井眼中的双相水相系统泵送到地下位置,以及iii。 将两相混合物转化成地下,使其相结合成单一的水相,其比双相混合物更粘稠。 水相两相混合物的两相含有在两相之间分离的溶解的溶质,使得至少一种第一溶质在第一水相中的浓度比在第二水相中以更高的浓度存在,而至少一种第二溶质存在于 在第二水相中比在第一水相中浓度更高。 第一相中的溶质可以是增稠聚合物或其它增稠材料如粘弹性表面活性剂。 第二相中的溶质可以是不同的聚合物,表面活性剂或盐。 转化为单相可以以各种方式进行,包括稀释,pH变化,盐度变化,温度升高和一种溶质在地层岩石上的吸附。