公开(公告)号：US20190233712A1

公开(公告)日：2019-08-01

申请号：US16380681

申请日：2019-04-10

Applicant: Chevron U.S.A. Inc.

Inventor： Nariman FATHI NAJAFABADI ,  Jagannathan MAHADEVAN ,  Adwait CHAWATHE

IPC: C09K8/58 ,  C09K8/584 ,  C09K8/588 ,  E21B43/16

CPC classification number: C09K8/58 ,  C09K8/584 ,  C09K8/588 ,  E21B43/16 ,  E21B49/00

Abstract: Methods and systems are provided to enhance recovery of hydrocarbons from a formation by altering wettability at a surface of the formation towards more water-wet. One method includes: providing a formation; providing an aqueous stream for injecting into the formation; adding a reducing agent to the aqueous stream; and injecting the aqueous stream with the reducing agent into the formation to alter a surface charge of the surface of the formation to become more water-wet to enhance recovery of hydrocarbons from the formation. The reducing agent is responsive to characteristics of the formation, characteristics of brine of the formation, and characteristics of hydrocarbons of the formation. Also provided is a method to select a brine composition to be injected into a formation to alter wettability at a surface of the formation towards more water-wet to enhance recovery of hydrocarbons from the formation.

公开(公告)号：US20190323324A1

公开(公告)日：2019-10-24

申请号：US16387619

申请日：2019-04-18

Applicant: Chevron U.S.A. Inc.

Inventor： Soumyadeep GHOSH ,  Nariman Fathi NAJAFABADI ,  Adwait CHAWATHE ,  Sophany THACH ,  Anil AMBASTHA

IPC: E21B41/00 ,  C09K8/588 ,  G06N5/02 ,  E21B43/16

Abstract: One embodiment includes generating a polymer partitioning model that determines a concentration of the polymer in a brine phase of the microemulsion system and a concentration of the polymer in an aqueous component of a microemulsion phase of the microemulsion system. The embodiment includes determining a viscosity of the brine phase of the microemulsion system using the concentration of the polymer in the brine phase of the microemulsion system, determining a viscosity of the aqueous component of the microemulsion phase of the microemulsion system using the concentration of the polymer in the aqueous component of the microemulsion phase of the microemulsion system, and determining a viscosity of the microemulsion phase of the microemulsion system using the viscosity of the aqueous component of the microemulsion phase of the microemulsion system. The embodiment includes using determined viscosities to determine performance of a chemical enhanced oil recovery process scenario.

公开(公告)号：US20190233713A1

公开(公告)日：2019-08-01

申请号：US16380735

申请日：2019-04-10

Applicant: Chevron U.S.A. Inc.

Inventor： Adwait CHAWATHE ,  Nariman FATHI NAJAFABADI ,  Jagannathan MAHADEVAN

IPC: C09K8/58 ,  G16C20/30 ,  C09K8/84

Abstract: Methods and systems are provided to enhance recovery of hydrocarbons from a formation by altering wettability at a surface of the formation towards more water-wet. One method includes: providing a formation; providing an aqueous stream for injecting into the formation; adding a reducing agent to the aqueous stream; and injecting the aqueous stream with the reducing agent into the formation to alter a surface charge of the surface of the formation to become more water-wet to enhance recovery of hydrocarbons from the formation. The reducing agent is responsive to characteristics of the formation, characteristics of brine of the formation, and characteristics of hydrocarbons of the formation. Also provided is a method to select a brine composition to be injected into a formation to alter wettability at a surface of the formation towards more water-wet to enhance recovery of hydrocarbons from the formation.