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Enhanced Electrical Coagulation for Produced Water Treatment

IP.com Disclosure Number: IPCOM000253604D
Publication Date: 2018-Apr-16
Document File: 2 page(s) / 281K

Publishing Venue

The IP.com Prior Art Database

Abstract

The Enhanced Electrical Coagulation "EEC" reduces the cost & solids waste for treating produced water in oil field steam in-situ oil recovery, recycled water. The process treats the water with use of downstream ion exchange softeners for final softening to desired water quality specifications for use in high pressure oil field steam generators. This process applies to steam flood and other enhanced in-situ thermal recovery technologies for recovering hydrocarbons from subterranean formations.

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Enhanced Electrical Coagulation for Produced Water Treatment

Summary:

The Enhanced Electrical Coagulation “EEC” reduces the cost & solids waste for treating produced water

in oil field steam in-situ oil recovery, recycled water. The process treats the water with use of

downstream ion exchange softeners for final softening to desired water quality specifications for use in

high pressure oil field steam generators. This process applies to steam flood and other enhanced in-situ

thermal recovery technologies for recovering hydrocarbons from subterranean formations.

Description:

This process replaces lime softening by incorporating electrical coagulation “EC” with the controlled

addition of alkalinity to achieve the desired water quality specifications (hardness, alkalinity, silica) with

final pH adjustment using caustic to meet required steam generator liquid fraction pH. The generation

of OH “hydroxyl” from the “EC” results in the reduction of organics and inorganics from process water.

A sludge like substance is created and removed. The sludge substance is then treated with a flocculation

chemical for disposal in sludge ponds.

Process/Disclosure:

1. It is important to the control and efficiency of the “EEC” process to maintain the correct addition of alkalinity (e.g., soda ash) as required to control the removal of total hardness to a desired effluent target value. Measurement of total inorganic carbon “TIC” is required for this control of total hardness and alkalinity.

2. Operating pH of 6 to 8 is desired for optimal process reaction efficiencies and the creation of carbonate sludge from bi-carbonate alkalinity. Optimal process effluent pH is required to prevent downstream equipment and piping from scaling.

3. The EEC process removes silica when OH- is produced from the electrical current.

4. Control of the EEC process to allow only partial removal of organics, mainly tannin, to help prevent caustic corrosion stress cracking “CCSC” by maintaining the correct Tannin/Caustic.

5. Controlling steam generator liquid fraction “SLF” at optimal pH values, results in reduced scaling tendency and corrosion of the steam generator tubes. This is achieved by controlling the BFW TIC alkalinity and BFW pH for given steam quality in the p...