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Method for preparing cation type composite flocculant for treating waste drilling fluid

A technology of composite flocculant and waste drilling fluid, which is used in flocculation/sedimentation water/sewage treatment etc.

Active Publication Date: 2011-08-31
江苏肇方智能装备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a preparation method of cationic composite flocculant, to solve the problem of high cost of existing flocculants, synthesis or degradation products have Strong neurotoxicity and carcinogenicity, will cause the problem of secondary environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A preparation method for a cationic composite flocculant for oil and gas field waste drilling fluid treatment, comprising the steps of:

[0026] 1) Using the gelatin with relatively large molecular weight extracted from waste skin collagen by hydrolysis of alkali method (MgO) as raw material, the mass fraction is the same as 10% gelatin solution and H 2 SO 4 The solutions were mixed at a volume ratio of 2.5:1, and hydrolyzed at 60°C for 4 hours to obtain a hydrolyzed gelatin solution.

[0027] 2) Take 20mL of the hydrolyzed gelatin solution in 1), adjust its pH to 3, add 140mL of aluminum sulfate solution with a mass fraction of 5%, and mix well at room temperature, then add alkali to raise the pH value of the solution to 4.3. React at 40°C for 16 hours to obtain a cationic composite flocculant.

[0028] Use the flocculant prepared in this example to flocculate the waste drilling fluid in oil and gas fields. When using it, the ratio of the dosage of the flocculant to ...

Embodiment 2

[0030] A preparation method for a cationic composite flocculant for oil and gas field waste drilling fluid treatment, comprising the steps of:

[0031] 1) Using the gelatin with relatively large molecular weight extracted from waste skin collagen by hydrolysis of alkaline method (MgO) as raw material, prepare a gelatin solution with a mass fraction of 12%, and add 1.5% of 1398 neutral protease (according to the used The mass of gelatin) was hydrolyzed at 45°C for 3 hours to obtain a hydrolyzed gelatin solution.

[0032] 2) Take 20mL of the hydrolyzed gelatin solution in 1), adjust its pH=3, add 70mL of aluminum sulfate solution with a mass fraction of 5%, and mix well at room temperature, then add alkali to raise the pH value of the solution to 3.8, react at 30°C for 12 hours to obtain a cationic composite flocculant.

[0033] Use the flocculant prepared in this example to flocculate the waste drilling fluid in oil and gas fields. When using it, the ratio of the dosage of the...

Embodiment 3

[0035] A preparation method for a cationic composite flocculant for oil and gas field waste drilling fluid treatment, comprising the steps of:

[0036] 1) Using the gelatin with relatively large molecular weight extracted from waste skin collagen by hydrolysis of alkaline method (MgO) as raw material, prepare a gelatin solution with a mass fraction of 10%, and add 1.5% trypsin to it (according to the amount of gelatin used). mass), and hydrolyzed at 35°C for 3 hours to obtain a hydrolyzed gelatin solution.

[0037] 2) Take 20mL of the hydrolyzed gelatin solution in 1), adjust its pH to 3, add 100mL of aluminum sulfate solution with a mass fraction of 5%, and mix well at room temperature, then add alkali to raise the pH value of the solution to 4.0, react at 50°C for 10 hours to obtain a cationic composite flocculant.

[0038] Use the flocculant prepared in this example to flocculate the waste drilling fluid in oil and gas fields. When using it, the ratio of the dosage of the ...

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Abstract

The invention relates to a composite flocculant for treating waste drilling fluid generated in the petroleum drilling process, and a preparation method thereof. The preparation method comprises the following steps of: extracting gelatin with larger relative molecular mass from waste skin collagen through alkaline hydrolysis; further hydrolyzing the extracted gelatin into collagen with moderate relative molecular mass by using different hydrolytic reagents; and loading proper metal ions on the collagen by using a tanning mechanism in tanning chemistry to obtain a cation type composite flocculant, and performing flocculation on anionic waste drilling fluid. The composite flocculant prepared by the method has the advantages of low cost, simple operation, high flocculating efficiency, safety and nontoxicity for a human body and the like, and is an environment-friendly product. Meanwhile, the waste skin collagen is reutilized, waste is used to treat contamination, and secondary pollution on the environment is avoided.

Description

technical field [0001] The invention relates to the technical field of waste drilling fluid treatment, in particular to a preparation method of a cationic composite flocculant for waste drilling fluid treatment using waste skin collagen as a matrix. Background technique [0002] Abandoned drilling fluid, like dirty oil and sewage, is one of the three major public hazards in the production process of oil and gas fields. It is difficult to degrade in the natural state, and it accumulates around the operation area, occupying a large amount of cultivated land or grassland, causing soil compaction, land salinization, and making the occupied land lose its use value. At the same time, the waste drilling fluid accumulates and infiltrates into the subsurface water layer for a long time or flows into rivers and creeks with rainwater overflow, polluting water sources and endangering human health. With the continuous improvement of the country's environmental protection requirements, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52
Inventor 王学川张莎强涛涛周亮任龙芳
Owner 江苏肇方智能装备有限公司
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