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TREATMENT SCHEME FOR LOW SALINITY WATERFLOODING IN ENHANCED OIL RECOVERY APPLICATIONS

IP.com Disclosure Number: IPCOM000247556D
Publication Date: 2016-Sep-16
Document File: 3 page(s) / 53K

Publishing Venue

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Abstract

The invention relates generally to enhanced oil recovery and in particular to a process of producing low salinity water used for waterflooding of oil and gas wells in enhanced oil recovery. The method involves different unit operations connected to form a flowsheet to produce low salinity water. The method uses the principles of membrane distillation and deaeration. This method has the advantage of being simple, easy to operate, highly reliable, not affected much by the change in feed characteristics and an integrated solution to produce low salinity injection water.

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TREATMENT SCHEME FOR LOW SALINITY WATERFLOODING IN ENHANCED OIL RECOVERY APPLICATIONS

BACKGROUND

The invention relates generally to enhanced oil recovery and in particular to a method of producing low salinity water used for waterflooding of oil and gas wells in enhanced oil recovery. Waterflooding in oil recovery is a process where water is injected into the oil field,

Low

salinity water helps to increase waterflood efficiency by 2% to 40% in terms of oil production rate when compared to injection of seawater. Low salinity water injection changes the wettability characteristics of the reservoir rock, increasing the microscopic sweep efficiency, and thereby increasing the potential oil recovery. Waterflooding using low salinity water can reduce polymer concentrations by up to 10 times, resulting in reduced operating costs. Hence water desalination is very essential for effective oil recovery.

There are various methods for treatment of saline water in practice: 1) Membrane Distillation, Reverse osmosis RO) and Nanofiltration NF are the leading pressure-driven membrane processes, 2) Electrodialysis ED and Electrodialysis Reversal EDR processes are driven by direct current (DC in which ions flow through ion selective membranes to electrodes of opposite charge, 3) Forward osmosis is a process in which a salt concentration gradient osmotic pressure is the driving force through a synthetic membrane.

The problems that must be faced during the process of treatment of enhanced oil recovery EOR through conventional methods are high fouling of injection wells resulting in operational and maintenance issues and low recovery of crude oil from the wells. Methods and processes are proposed here that solve most of the above-mentioned challenges in the process of enhanced oil recovery in an efficient and cost effective way.

BRIEF DESCRIPTION OF DRAWINGS

The invention discloses a method to produce low salinity water for waterflooding of oil and gas wells:

FIG. 1 shows a method for producing low salinity water.

1

usually to increase pressure and thereby stimulating the production of oil. The salinity of the

injected water has a major impact on the recovery of hydrocarbons during waterflooding.


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DETAILED DESCRIPTION

The invention discloses methods and processes for p...