Method for treating polymer-driven oilfield sewage

A treatment method and oilfield sewage technology, which is applied in the direction of flocculation/sedimentation water/sewage treatment, mining wastewater treatment, etc., can solve the problems of increased flocculant consumption, easy blockage of process flow, etc., and achieve the effect of excellent water purification effect

Active Publication Date: 2012-08-08
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the partially hydrolyzed polyacrylamide in the poly-containing sewage also has a large amount of negative charges. After the flocculant combines with it, a large number of flocs will be formed. The flocs and oil droplets will form viscous sludge, which is easy to block the process flow and cause Increased consumption of flocculant

Method used

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  • Method for treating polymer-driven oilfield sewage
  • Method for treating polymer-driven oilfield sewage
  • Method for treating polymer-driven oilfield sewage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1, purify sewage with block polyether J121 and cationic polymer S58

[0025] Take 25mL of oil field sewage, put it in a constant temperature box at 65°C for 1 hour, add block polyether J121 and cationic polymer S58 respectively after taking it out, the total concentration is 200mg / L, and the ratio of the two is 2:1, 1 : 1 and 1: 2, and shake it by hand for 1 min to mix evenly. Among them, the mixed agent with a mass ratio of 1: 1 has good oil removal and water purification effects after treatment, and no obvious flocs are produced, such as figure 1 shown.

Embodiment 2

[0026] Embodiment 2, purify sewage with block polyether J402 and cationic polymer S58

[0027] Take 25mL of oil field sewage, put it in a constant temperature box at 65°C for 1 hour, add block polyether J402 and cationic polymer S58 respectively after taking it out, the total concentration is 100, 200, 250mg / L, that is, the mass ratio of the two 1:1, 2:1, and 4:1, respectively, and mixed by hand for 1 min. Among them, the 2:1 mixed agent has better oil removal and water purification effects after treatment, and the amount of flocs is less, such as figure 2 shown.

Embodiment 3

[0028] Example 3, Purify sewage with block polyether J121 and cationic polymer S42

[0029] Take 25mL of oil field sewage, put it in a constant temperature box at 65°C for 1 hour, add block polyether J121 and cationic polymer S42 respectively after taking it out, the total concentration is 200mg / L, and the ratio of the two is 2:1, 1 : 1 and 1: 2, and shake it by hand for 1 minute to mix evenly. Among them, the mixed agent with a mass ratio of 1: 1 has a slightly better treatment effect, no obvious floc formation, and has a certain degreasing effect, such as image 3 shown.

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Abstract

The invention discloses a method for treating polymer-driven oilfield sewage. The method comprises the following steps of: adding polyether and cationic polyacrylamide into polymer-driven oilfield sewage; and uniformly mixing to perform oil removal and water purification on the polymer-driven oilfield sewage, wherein the polyether is a polyoxyethylene-polyoxypropylene-polyoxyethylene block copolymer or a polyamine-containing polyoxypropylene-polyoxyethylene copolymer. The method has the advantages that: (1) both the polyether and cationic polyacrylamide are water-soluble, and can be fully dissolved into sewage for being brought into play; (2) the polyether and cationic polyacrylamide can be added segmentally or in a mixed way according to the property of sewage, and an original sewage treatment flow is not required to be changed; (3) oil removing and water purifying effects are superior to single use of a single-component agent; and (4) a large quantity of adhesive floccules are not produced specific to polymer-bearing sewage.

Description

technical field [0001] The invention relates to a method for treating sewage in a polymer flooding oil field, and belongs to the technical field of oil field environmental protection. Background technique [0002] Polymer flooding EOR technology has achieved remarkable oil stabilization and water control effects in both onshore and offshore oilfields, and has become an important means of increasing production in oilfields. Polymer flooding injects a certain concentration of water-soluble partially hydrolyzed polyacrylamide solution into the target oil layer to increase the viscosity of the displacement phase and reduce the mobility ratio of the displacement fluid and the displaced fluid, thereby expanding the swept volume and achieving enhanced oil recovery. rate purposes. As the polymer solution migrates in the reservoir, a certain concentration of polymer gradually appears in the production fluid at the production end. The output of polymer will increase the oil content ...

Claims

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Application Information

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IPC IPC(8): C02F1/56C02F103/10
Inventor 靖波张健
Owner CHINA NAT OFFSHORE OIL CORP
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