公开(公告)号：US20070056737A1

公开(公告)日：2007-03-15

申请号：US11517688

申请日：2006-09-08

Applicant: James Crews ,  John Willingham

Inventor： James Crews ,  John Willingham

IPC: E21B43/26 ,  E21B43/22

CPC classification number: C09K8/68 ,  C09K2208/26 ,  C09K2208/30

Abstract: 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.

Abstract translation: 用粘弹性表面活性剂（VES）粘稠的流体可以通过包含至少一种矿物油，至少一种聚α-烯烃油和/或至少一种饱和脂肪酸的破碎剂组合物的直接或间接作用使其粘度降低（凝胶破裂） 。 断路器可以最初分散在液体的内部不连续相中。 在一个非限制性实施例中，断路器，例如， 矿物油在其基本凝胶化之后加入到流体中。 认为断裂组合物可能通过在升高的液体温度下以非自发的速率控制的方式重新排列，解聚或以其他方式攻击VES凝胶化流体的胶束结构。 在具体的非限制性实例中，用氧化胺表面活性剂凝胶化的盐水溶液可以使其粘度用轻质，低粘度的石蜡矿物油破碎。

公开(公告)号：US20060258541A1

公开(公告)日：2006-11-16

申请号：US11430655

申请日：2006-05-09

Applicant: James Crews

Inventor： James Crews

IPC: C09K8/00 ,  E21B43/00

CPC classification number: C09K8/68 ,  C09K8/52 ,  C09K2208/30

Abstract: Clean-up additive compositions may be used to enhance the clean-up of VES-gelled aqueous fluids in a wide range of applications and VES fluid compositions, including use of an internal breaker system. The compositions are microemulsions that may include, but not necessarily be limited to, at least one viscosity reducing agent, at least one solubilizing agent, at least one desorption agent and at least one water wetting agent. One non-limiting embodiment of a specific microemulsion includes an unsaturated fatty acid oil, a glycol, a sorbitan ester/ethoxylated sorbitan ester mixture, and an alkyl sulfonate. Microemulsions may perform one or more of the following functions: keeping the reservoir water wet; keeping surface tension reduction low; demulsifying reservoir crude oils and aqueous VES fluids; dispersing and solubilizing the by-products generated when breaking the VES gel; and/or limiting the amount of VES residue on reservoir minerals.

Abstract translation: 清洁添加剂组合物可用于在广泛的应用和VES流体组合物（包括使用内部破碎器系统）中增强VES凝胶水性流体的清洁。 组合物是微乳液，其可以包括但不限于至少一种降粘剂，至少一种增溶剂，至少一种解吸剂和至少一种水润湿剂。 特定微乳液的一个非限制性实施方案包括不饱和脂肪酸油，二醇，脱水山梨糖醇酯/乙氧基化脱水山梨醇酯混合物和烷基磺酸盐。 微乳液可以执行以下一个或多个功能：保持储水器湿润; 保持表面张力降低; 对油气原油和VES水溶液进行破乳; 分散和溶解破坏VES凝胶时产生的副产物; 和/或限制储层矿物中VES残留物的量。

公开(公告)号：US20060211775A1

公开(公告)日：2006-09-21

申请号：US11372624

申请日：2006-03-10

Applicant: James Crews

Inventor： James Crews

IPC: C08J3/02 ,  C09K8/68

CPC classification number: C09K8/68 ,  C09K8/506 ,  C09K8/518 ,  C09K8/602 ,  C09K8/703 ,  C09K8/706 ,  C09K2208/26 ,  C09K2208/30 ,  Y10S514/944 ,  Y10S516/90

Abstract: Fluids viscosified with viscoelastic surfactants (VESs) may have their viscosities affected (increased or reduced, e.g. gels broken) by the indirect or direct action of a composition that contains at least one fatty acid that has been affected, modified or reacted with an alkali metal base, an alkali earth metal base, ammonium base, and/or organic base compound, optionally with an alkali metal halide salt, an alkali earth metal halide salt, and/or an ammonium halide salt. The composition containing the resulting saponification product is believed to either act as a co-surfactant with the VES itself to increase viscosity and/or possibly by disaggregating or otherwise affecting the micellar structure of the VES-gelled fluid. In a specific, non-limiting instance, a brine fluid gelled with an amine oxide surfactant may have its viscosity broken with a composition containing naturally-occurring fatty acids in canola oil or corn oil affected with CaOH, MgOH, NaOH and the like.

Abstract translation: 用粘弹性表面活性剂（VES）粘稠的流体可能通过含有至少一种脂肪酸的组合物的间接或直接作用而影响其粘度（增加或减少，例如凝胶破裂），该组合物已经受到碱金属的影响，改性或反应 碱，碱土金属碱，铵碱和/或有机碱化合物，任选地具有碱金属卤化物盐，碱土金属卤化物盐和/或卤化铵盐。 据信含有所得皂化产物的组合物可以作为与VES本身的助表面活性剂以增加粘度和/或可能通过解聚或以其它方式影响VES凝胶化流体的胶束结构。 在特定的非限制性实例中，用氧化胺表面活性剂凝胶化的盐水溶液可能会在含有CaOH，MgOH，NaOH等的卡诺拉油或玉米油中，使其含有含有天然存在的脂肪酸的组合物的粘度破碎。