公开(公告)号：US09902894B2

公开(公告)日：2018-02-27

申请号：US14927084

申请日：2015-10-29

Applicant: Chevron U.S.A. Inc.

Inventor： Varadarajan Dwarakanath ,  Robert M. Dean ,  Do Hoon Kim ,  Dennis Arun Alexis ,  Sophany Thach ,  Taimur Malik ,  Anette Poulsen ,  Sumitra Subrahmanyan

IPC: C09K8/588 ,  C09K8/584 ,  C09K8/68 ,  E21B43/16 ,  E21B43/26 ,  C09K8/88

CPC classification number: C09K8/588 ,  C09K8/584 ,  C09K8/68 ,  C09K8/88 ,  E21B43/16 ,  E21B43/26

Abstract: A method for making a polymer suspension for use in enhancing the production of oil from a formation is disclosed. In one embodiment, the method comprises mixing a powder polymer having an average molecular weight of 0.5 to 30 Million Daltons into a water soluble solvent having an HLB of greater than or equal to 8 for less than or equal to 24 hours. The water soluble solvent is selected from a group, at a weight ratio from 20:80 to 80:20. The polymer suspension is stable, pumpable, and substantially anhydrous; and it is hydrated for an injection solution in less than or equal to 4 hours, containing a polymer concentration ranging from 100 ppm to 50,000 ppm and having a filter ratio of less than or equal to 1.5 at 15 psi using a 1.2 μm filter, by mixing a sufficient amount of the polymer suspension in an aqueous fluid.

公开(公告)号：US09810049B2

公开(公告)日：2017-11-07

申请号：US14750284

申请日：2015-06-25

Applicant: Chevron U.S.A. Inc.

Inventor： Robert Matthew Dean ,  Varadarajan Dwarakanath ,  Taimur Malik ,  Will Sherman Slaughter ,  Dustin L. Walker

IPC: E21B43/16 ,  E21B33/124 ,  E21B43/11 ,  E21B43/12

CPC classification number: E21B43/16 ,  E21B33/124 ,  E21B43/11 ,  E21B43/128

Abstract: The present disclosure provides techniques for inline injection of water and chemicals for a dump flood. The techniques include collecting water from a source reservoir into a water collection zone of an adjacent water injection well, and injecting a chemical solution into the water injection well. The water and the chemical solution are then mixed downhole in a mixer, such as a static mixer. The mixed injection fluid is then directly injected into an adjacent target reservoir.

公开(公告)号：US20160122626A1

公开(公告)日：2016-05-05

申请号：US14927078

申请日：2015-10-29

Applicant: Chevron U.S.A. Inc.

Inventor： Varadarajan Dwarakanath ,  Robert M. Dean ,  Do Hoon Kim ,  Dennis Arun Alexis ,  Sophany Thach ,  Taimur Malik ,  Anette Poulsen

IPC: C09K8/68 ,  E21B43/26 ,  E21B43/16

CPC classification number: C09K8/588 ,  C09K8/584 ,  C09K8/68 ,  C09K8/88 ,  E21B43/16 ,  E21B43/26

Abstract: A method of enhancing oil recovery in a subterranean reservoir is disclosed. In one embodiment, the method comprises providing a wellbore and a polymer suspension. The polymer suspension comprises a powder polymer having an average molecular weight of 0.5 to 30 Million Daltons suspended in a water soluble solvent having an HLB of greater than or equal to 8 and selected from a group, at a weight ratio of 20:80 to 80:20. The method comprises providing an aqueous fluid, mixing a sufficient amount of the polymer suspension in the aqueous fluid for the polymer to be hydrated resulting an injection solution in less than or equal to 4 hours, and injecting the injection solution into the wellbore. The injection solution contains a polymer concentration ranging from 100 ppm to 50,000 ppm and has a filter ratio of less than 1.5 at 15 psi using a 1.2 μm filter.

Abstract translation: 公开了一种提高地下储层中油回收率的方法。 在一个实施方案中，该方法包括提供井眼和聚合物悬浮液。 聚合物悬浮液包含悬浮在HLB大于或等于8的水溶性溶剂中的平均分子量为0.5至30百万道尔顿的粉末聚合物，并且选自重量比为20:80至80 ：20。 该方法包括提供水性流体，将足够量的聚合物悬浮液混合在水性流体中以供待水合的聚合物在少于或等于4小时内产生注射溶液，并将注入溶液注入井眼。 注射溶液的聚合物浓度范围为100ppm至50,000ppm，并且在15psi下使用1.2μm的过滤器具有小于1.5的过滤比。