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Determination of an actual optimum salinity and an actual optimum type of microemulsion for surfactant/polymer flooding

a technology of surfactant/polymer flooding and optimum type of microemulsion, which is applied in the direction of fluid removal, survey, borehole/well accessories, etc., can solve the problem of leaving behind a significant portion of the total amount of oil in the reservoir

Inactive Publication Date: 2009-08-06
TOTAL E&P RES & TECH USA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The extraction of crude oil from a reservoir by conventional (primary / secondary oil) recovery technology, however, leaves behind a significant portion of the total amount of oil in that reservoir.

Method used

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  • Determination of an actual optimum salinity and an actual optimum type of microemulsion for surfactant/polymer flooding
  • Determination of an actual optimum salinity and an actual optimum type of microemulsion for surfactant/polymer flooding
  • Determination of an actual optimum salinity and an actual optimum type of microemulsion for surfactant/polymer flooding

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Embodiment Construction

[0019]The current state of the art of determining an optimum salinity within a Type III microemulsion system focuses on one parameter-interfacial tension. In arriving at the present invention, though it was believed that interfacial tension is an important factor in the ultimate oil recovery, it was realized that other potentially important parameters were not being taken into account in the selection of the optimum salinity type. Accordingly, it was hypothesized that if the other parameters such as relative permeability, phase trapping and adsorption, were taken into account, the actual optimum salinity determined would, often times, be other than a Type III and / or a different value from the conventional optimum salinity. Simulations of multiphase flow in surfactant flooding were conducted to determine the effect of several parameters on oil recovery factor.

[0020]The simulations were conducted on a chemical flood simulator known as the University of Texas Chemical Simulator, UTCHEM...

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Abstract

Systems and methods for the determination of an optimum salinity type and an optimum salinity of a surfactant microemulsion system are shown. Optimum salinity type and optimum salinity in surfactant / polymer flooding is determined, according to embodiments, by core-flood experiments so that a variety of multiphase flow parameters such as relative permeability and phase trapping that affects oil recovery factor, influences the determination of the optimum salinity type and optimum salinity. The optimum salinity determined from this approach preferably corresponds to the highest oil recovery factor.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is related to co-pending application, U.S. Pat. Ser. No. XX / XXX,XXX, Attorney Docket No. 55805 / P004US / 10800390, filed ______, entitled “DESIGN OF OPTIMUM SALINITY PROFILE IN SURFACTANT / POLYMER FLOODING,” concurrently filed herewith, the disclosure of which is incorporated herein by reference.TECHNICAL FIELD[0002]The present disclosure relates to the field of Enhanced Oil Recovery (EOR) from reservoirs using a surfactant system. Specifically, the disclosure relates to the determination of an actual optimum type of microemulsion. Additionally, the determination of an actual optimum salinity in surfactant / polymer flooding is disclosed.BACKGROUND OF THE INVENTION[0003]Petroleum (crude oil) is a finite resource that naturally occurs as a liquid in formations in the earth. Usually, crude oil is extracted by drilling wells into underground reservoirs. If the pressure of the crude oil underground is sufficient, then that pressure...

Claims

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Application Information

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IPC IPC(8): E21B43/22
CPCE21B43/16C09K8/584
Inventor SHENG, JAMES J.
Owner TOTAL E&P RES & TECH USA
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