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Water injection systems and methods

a technology of water injection system and water injection, applied in the field of systems and methods, can solve the problem that the observed changes cannot explain the potential changes of the surface, and achieve the effect of enhancing crude oil recovery and lowering ionic strength

Inactive Publication Date: 2012-04-19
SHELL OIL CO
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  • Application Information

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Benefits of technology

[0012]One aspect of the invention provides a method for enhancing recovery of crude oil from a porous subterranean carbonate formation of which the pore spaces contain crude oil and connate water, the method comprising determining an ionic strength of the connate water; and injecting an aqueous displacement fluid having a lower ionic strength than the connate water into the formation.

Problems solved by technology

The surface potential changes are not able to explain the observed changes in oil recovery caused by changes in pore water chemistry or temperature.

Method used

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  • Water injection systems and methods
  • Water injection systems and methods
  • Water injection systems and methods

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[0060]FIG. 5:

[0061]Results from spontaneous imbibition experiments on Middle Eastern limestone core material at 70° C. (Sample1). Dashed line indicates a point in time when change of the brine in the Amott cell took place.

[0062]A spontaneous imbibition test was carried out at 70° C. on Middle Eastern limestone core Sample 1 of about 50 mD permeability and 22% porosity. The oil viscosity was 3.2 mPas. The ionic strength of the formation brine was 4.39 mol / L, while fresh water, used as wettability modifying brine, had ionic strength of 0.32 mol / L. Upon change from the formation water to the fresh water, there was additional oil recovery of 20% indicating wettability change towards more water-wet. Hence, reduction of ionic strength of the brine by a factor of 14 leads to wettability modification.

[0063]FIG. 6:

[0064]Results from spontaneous imbibition experiments on Middle Eastern limestone core material at 70° C. using solution of NaCl as an imbibition brine.

[0065]Second experiment was ...

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Abstract

There is disclosed a method for enhancing recovery of crude oil from a porous subterranean carbonate formation of which the pore spaces contain crude oil and connate water, the method comprising determining an ionic strength of the connate water; and injecting an aqueous displacement fluid having a lower ionic strength than the connate water into the formation.

Description

PRIORITY CLAIM[0001]The present application claims the benefit to priority of U.S. Provisional Application No. 61 / 393,471 entitled “Water Injection Systems and Methods” filed Oct. 15, 2010.FIELD OF INVENTION[0002]The present disclosure relates to systems and methods for injecting water into a hydrocarbon bearing formation.BACKGROUND[0003]Oil accumulated within a subterranean oil-bearing formation is recovered or produced therefrom through wells, called production wells, drilled into the subterranean formation. A large amount of such oil may be left in the subterranean formations if produced only by primary depletion, i.e., where only formation energy is used to recover the oil. Where the initial formation energy is inadequate or has become depleted, supplemental operations, often referred to as secondary, tertiary, enhanced or post-primary recovery operations, may be employed. In some of these operations, a fluid is injected into the formation by pumping it through one or more injec...

Claims

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Application Information

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IPC IPC(8): E21B43/16E21B43/20E21B43/22E21B47/00
CPCC09K8/592C09K8/58
Inventor LIGTHELM, DIRK JACOBROMANUKA, JULIJASUIJKERBUIJK, BARTHOLOMEUS MARINUS JOSEPHUS MARIA
Owner SHELL OIL CO
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