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Synthesis method of organic chromium composite salt for complexing-crosslinking

A synthesis method and organic chromium technology, applied in the field of oil exploitation, can solve the problems of strong oxidizing and acute toxicity limitation, increase fear, etc., and achieve the effects of promoting stability, increasing volatile recovery, and realizing comprehensive utilization.

Inactive Publication Date: 2020-05-15
CNOOC TIANJIN CHEM RES & DESIGN INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] For a long time, hexavalent chromium such as sodium dichromate and sodium chromate have been used in the field of cross-linking agents for oil production and water injection profile control, and the effect is excellent, but the strong oxidation and toxicity of hexavalent chromium limit its use, especially Hexavalent chromium is one of the internationally recognized carcinogens, which also increases the fear of human beings to use it
At present, the use of hexavalent chromium cross-linking agents has been banned

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0024] Step 1: sequentially add 150 grams of water, 50 grams of chromic anhydride, and 111 grams of propionic acid into the reactor with condensing reflux, stir, preheat and control the temperature at 60°C;

[0025] Step 2: Mix 245 grams of water, 6 grams of reducing agent methanol and 3 grams of masking agent citric acid, and transfer to a high-level container for use;

[0026] Step 3: Slowly add the mixed solution prepared in step 2 to the solution prepared in step 1, stir continuously, control the reaction temperature to 70°C, and open the condensing reflux device at the same time, reflux at 60°C for recovery, continuous reaction, and control the dropping time for 1 hour ;

[0027] Step 4: After adding the solution reaction in step 2, continue the aging reaction of stirring, heat preservation, and reflux, and continue the aging time for 1 hour, and naturally cool down for 1 hour;

[0028] Step 5: Add 0.5 grams of zinc sulfate anti-stress agent to the finished product of st...

example 2

[0030] A kind of synthetic method of organic chromium crosslinking agent, described synthetic method comprises the following steps at least:

[0031] Step 1: sequentially add 200 grams of water, 50 grams of chromic anhydride, and 50 grams of propionic acid into the reactor with condensing reflux, stir, preheat and control the temperature between 50 °C;

[0032] Step 2: Mix 195 grams of water, 6 grams of reducing agent methanol, 4 grams of masking agent hydrochloric acid and 61 grams of propionic acid, and transfer them to a high-level container for use;

[0033] Step 3: Slowly add the mixed solution prepared in step 2 to the solution prepared in step 1, stir continuously, control the reaction temperature at 80°C, and open the condensing reflux device at the same time, reflux at 50°C for recovery, continuous reaction, and control the dropping time for 1.5 hours ;

[0034] Step 4: After adding the solution reaction in step 2, continue the aging reaction of stirring, heat preser...

example 3

[0037] A kind of synthetic method of organic chromium crosslinking agent, described synthetic method comprises the following steps at least:

[0038] Step 1: Add 250 grams of water, 50 grams of chromic anhydride, and 30 grams of propionic acid into the reactor with condensing reflux in sequence, stir, preheat and control the temperature at 50 °C;

[0039] Step 2: Mix 145 grams of water, 6 grams of reducing agent methanol, 3 grams of masking agent oxalic acid and 81 grams of propionic acid, and transfer to a high-level container for use;

[0040] Step 3: Slowly add the mixed solution prepared in step 2 to the solution prepared in step 1, stir continuously, control the reaction temperature at 90°C, and open the condensing reflux device at the same time, reflux at 50°C for recovery, continuous reaction, and control the dropping time for 2 hours ;

[0041] Step 4: After adding the solution reaction in step 2, continue the aging reaction of stirring, heat preservation, and reflux ...

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PUM

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Abstract

The invention relates to a synthesis method of organic chromium composite salt for complexing-crosslinking. The synthesis method mainly comprises the following steps: 1) sequentially adding water, chromic anhydride, propionic acid and a masking agent into a reactor with a reflux condensation function, stirring at 40-60 DEG C, and preheating; 2) mixing water, a reducing agent, a masking agent and acertain amount of propionic acid; 3) adding the mixed solution prepared in the step 2) into the solution prepared in the step 1), continuously stirring, controlling the reaction temperature in a range of 60 to 90 DEG C, carrying out reflux condensation at a temperature of 50 to 60 DEG C to recover, and continuing the reactions; (4) after the mixed solution prepared in the step (2) is completely added, keeping on stirring, carrying out curing reactions for 0.5 to 1 hour at a constant temperature under a refluxing condition, and naturally cooling for 1 to 2 hours; and 5) adding a stress resistance agent into a finished product obtained in the step 4), and stirring for 5-10 minutes. According to the synthesis method, common raw materials and a popular process are adopted, the reaction process is reasonably dispersed, key factors influencing the quality and the exertion efficiency are perfected, the stability is improved, the operation is simple, and the application range of the product is wide.

Description

technical field [0001] The invention relates to the field of petroleum exploitation, in particular to a method for synthesizing an organic chromium crosslinking agent for profile control, fracturing and oil displacement. Background technique [0002] For a long time, hexavalent chromium such as sodium dichromate and sodium chromate have been used in the field of cross-linking agents for oil production and water injection profile control, and the effect is excellent, but the strong oxidation and toxicity of hexavalent chromium limit its use, especially Hexavalent chromium is one of the internationally recognized carcinogens, which also increases the fear of human beings to use it. At present, the use of hexavalent chromium crosslinking agents has been banned. [0003] Trivalent chromium is greatly affected by the valence state of its own chromium salt and the composition of compounds when it is used for profile control and cross-linking in oil production. Among them, trivale...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/512C09K8/58C09K8/68C07C51/41C07C53/122
CPCC07C51/412C09K8/512C09K8/58C09K8/685C07C53/122
Inventor 张大威陈爱民陆彩霞马浴铭李霞魏文宇王贺昌林晓伟闫红梅
Owner CNOOC TIANJIN CHEM RES & DESIGN INST