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A composite coagulant for oilfield produced water treatment

A technology of coagulant and produced water, which is applied in the direction of flocculation/sedimentation water/sewage treatment, etc. It can solve the problems of large amount of dosing, inability to meet the basic requirements of oil fields, and ineffective removal of coagulant, etc. Effect

Inactive Publication Date: 2011-12-14
XIAN CHANGQING TECH ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Oilfield produced water treatment systems mostly use physical methods to remove oil and suspended solids. Most of the dirty oil and suspended solids are suspended in the water body and cannot be removed after precipitation. It is necessary to add coagulants to make them coalesce and become larger before they can be removed. The removal effect of coagulants is not obvious or the dosage is large, which cannot meet the basic requirements of oilfield produced water treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Get the PAC of 28g, get 0.8g molecular weight and be the PAM of 8,000,000, and the water of 400L carries out compound mixing, obtains the composite coagulant of the present invention; Described PAC is polyaluminum chloride, and molecular formula is AL 2 (OH) n CL 6-n ] m , wherein, both n and m are natural numbers, n=3-5, m≤10; the PAM is polyacrylamide.

Embodiment 2

[0015] Get the PAC of 32g, get 1.2g molecular weight and be the PAM of 8,000,000, and the water of 600L is compounded and mixed, promptly obtains the composite coagulant of the present invention; Described PAC is polyaluminum chloride, and molecular formula is AL 2 (OH) n CL 6-n ] m , wherein, both n and m are natural numbers, n=3-5, m≤10; the PAM is polyacrylamide.

Embodiment 3

[0017] Get the PAC of 30g, get the PAM that 1g molecular weight is 8,000,000, and the water of 500L is compounded and mixed, promptly obtains the composite coagulant of the present invention; Described PAC is polyaluminum chloride, and molecular formula is AL 2 (OH) n CL 6-n ] m , wherein, both n and m are natural numbers, n=3-5, m≤10; the PAM is polyacrylamide.

[0018] The composite coagulant of the present invention is solid powder or liquid solution.

[0019] When PAC and PAM with a molecular weight of 8 million are directly compounded and mixed at a weight ratio of 28-32:0.8-1.2, the composite coagulant is a solid powder.

[0020] Test effect:

[0021] Get composite coagulant of the present invention to adopt PAM in conventional flocculant and composite coagulant and adopt molecular weight 4,000,000 to compare under the same conditions as follows:

[0022] Table 1 Effect of conventional flocculant treatment

[0023] pH 8.0 when unprocessed 6.0...

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PUM

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Abstract

The invention relates to the field of oilfield produced water treatment, in particular to a composite coagulant for oilfield produced water treatment, which is characterized in that it is made of the following raw materials according to the following weight ratio: PAC: PAM with a molecular weight of 8 million: water = 28-32: 0.8-1.2: 4-6×105; the PAC is polyaluminum chloride, the molecular formula is AL2(OH)nCL6-n]m, where n and m are natural numbers, n=3-5 , m≤10; the PAM is polyacrylamide. The composite coagulant has the characteristics of obvious coagulation effect and low price.

Description

technical field [0001] The invention relates to the field of oilfield produced water treatment, in particular to a composite coagulant for oilfield produced water treatment. Background technique [0002] Oilfield produced water treatment systems mostly use physical methods to remove oil and suspended solids. Most of the dirty oil and suspended solids are suspended in the water body and cannot be removed after precipitation. It is necessary to add coagulants to make them coalesce and become larger before they can be removed. The removal effect of some coagulants is not obvious or the dosage is large, which cannot meet the basic requirements of oilfield produced water treatment. Contents of the invention [0003] The purpose of the present invention is to provide a composite coagulant for oilfield produced water treatment, which has good coagulation effect, obvious effect of removing oil and suspended solids, less dosage and low price. [0004] The object of the present in...

Claims

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Application Information

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IPC IPC(8): C02F1/52
Inventor 王国柱郭增民郭志强熊超王向国徐文
Owner XIAN CHANGQING TECH ENG