Electrochemistry method for treating oilfield produced water into confecting polymer water

A technology for producing water, mixing and gathering water, applied in chemical instruments and methods, water/sewage treatment, water/sewage multi-stage treatment, etc., to achieve wide adaptability, easy promotion and application, and easy operation

Inactive Publication Date: 2009-03-25
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, there is no electrochemical method to remove Ca from oilfield produced water. 2+ , Mg 2+ and Fe 2+ and other divalent cations without increasing K in oilfield produced water + 、Na + A report on the softening treatment of oilfield produced water into complex water by equalizing the concentration of monovalent cations

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] In this embodiment, the electrochemical method is used to feed unidirectional continuous direct current to the oilfield sewage to treat the oilfield produced water of a certain sewage station, and the treatment flow rate is 238m 3 / h. The voltage between each pair of negative and positive electrodes is 5.12V, and the current is 3840A. The 4 pairs of electrodes are connected in parallel, and the total electrode area is 1.28m 2 , the current density is 3000A / m 2 The distance between each pair of negative and positive electrode plates is 50 mm, and the space between each pair of negative and positive electrodes is filled with polystyrene resin containing carboxylate. The anode material is a composite electrode of titanium, ruthenium, rhodium, and iridium, and the cathode material is For stainless steel. The anode will reduce the reducing substances in the oilfield produced water, such as Fe 2+ , S 2- Plasma and FeS colloids are oxidized and hydrolyzed into colloidal Fe...

Embodiment 2

[0039] In this embodiment, the electrochemical method is used to feed regular reverse continuous direct current to the oilfield sewage to treat the oilfield produced water of a certain sewage station, and the treatment flow rate is 354m 3 / h. The voltage between each pair of cathode and anode electrodes is 4.37V, the current is 6724A, 21 pairs of electrodes are connected in parallel, and the total electrode area is 6.72m 2 , the current density is 1000A / m 2 , the distance between each pair of negative and positive electrode plates is 20 mm, and the space between each pair of negative and positive electrodes is filled with polystyrene resin containing sulfonate. The anode material is iron, aluminum, platinum, and the cathode material is stainless steel. The anode will reduce the reducing substances in the oilfield produced water, such as Fe 2+ , S 2- Plasma and FeS colloids are oxidized and hydrolyzed into colloidal Fe x (OH) m (3x-m)+ and elemental sulfur, while complete...

Embodiment 3

[0044] In this embodiment, the electrochemical method is used to feed unidirectional pulse direct current to the oilfield sewage to treat the oilfield produced water in a certain sewage station, and the treatment flow rate is 430m 3 / h. The voltage between each pair of cathode and anode is 1V, and the current is 5497A. In this embodiment, there are 26 pairs of electrodes, the first group has 13 pairs of electrodes connected in parallel, the second group has 13 pairs of electrodes connected in parallel, and then the two groups are connected in series; the total area of ​​the electrodes is 8.32m 2 , the current density is 1602A / m 2 The distance between each pair of negative and positive electrode plates is 25 mm, and the space between each pair of negative and positive electrodes is filled with polystyrene resin containing quaternary ammonium salts. The anode material is a composite electrode of titanium, ruthenium, platinum, and ruthenium, and the cathode material is For stai...

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Abstract

The invention discloses an electrochemical method for processing oil field output water to be distributed polywater. The method utilizes the strong basicity of a cathode area (including cathode surface) to lead the dissociative Ca<2+>, Mg<2+> ions to generate CaCO3, Ca(OH)2 and Mg(OH)2 deposits, and finally the distributed polywater with calcium ion content not more than 30mg / L and magnesium ion content not more than 50mg / L, can be obtained by flocculation, sedimentation and filter treatments, thus achieving the object of removing the bivalent positive ions such as Ca<2+>, Mg<2+>, Fe<2+> and the like as well as the tervalence positive ions such as Fe<3+> in the oil field output water, moreover, without increasing the concentration of the monovalent positive ions such as K<+>, Na<+> and the like in the oil field output water so as to maintain the viscosity of polymer solution to the greatest extent. The method has no pollution, saves resources and cost, does not generate drug fastness, has simple, safe and convenient operation, is easy to regulation and control as well as automation realization, thus having wide suitability on the water amount and facilitating popularization and utilization.

Description

technical field [0001] The invention relates to an electrochemical method for treating oilfield produced water (also called oilfield sewage) into compounded water, belonging to the field of oilfield produced water treatment. Background technique [0002] Polymer flooding (a method of tertiary oil recovery) has been widely promoted and applied in many oilfields in China, especially large oilfields such as Daqing Oilfield and Shengli Oilfield, and has achieved good oil recovery effects and economic benefits. It is one of the important successor technologies for the sustainable development of oilfields. During the implementation of polymer flooding, how to maintain the viscosity of the injected polymer solution is the core technology throughout this technology, and it is also one of the important contents of current polymer flooding research. In order to maintain the viscosity of the polymer injection fluid, the current practice in most oilfields in my country is to use ultra-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C02F1/461C02F1/52
Inventor 游革新
Owner SOUTH CHINA UNIV OF TECH
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