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Clay antiswelling agent for petroleum extraction and preparation method thereof

A technology of anti-swelling agent and clay, which is applied in the field of oilfield chemical agent-clay anti-swelling agent and its preparation, can solve the problems of poor anti-swelling effect and formation permeability damage, and achieves a long-lasting anti-swelling effect and overcomes permeability damage. Effect

Active Publication Date: 2010-12-22
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The molecular structure of the currently used organic cationic anti-swelling agent is mainly straight chain or network structure. When the molecular weight is small, the anti-swelling effect is poor. When the molecular weight is large, the flocculation will cause formation permeability damage, especially in medium and low permeability reservoirs.

Method used

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  • Clay antiswelling agent for petroleum extraction and preparation method thereof
  • Clay antiswelling agent for petroleum extraction and preparation method thereof
  • Clay antiswelling agent for petroleum extraction and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] With a 500ml glass reaction flask, install a stirrer, a thermometer and a nitrogen gas tube, add 200ml of distilled water, 84g of diallyldimethylammonium chloride and 14.5g of triallylamine. Start stirring, fully dissolve completely, pass in nitrogen, heat up, add an initiator at 75-80°C, the initiator is ammonium persulfate, the dosage is 0.03g, and polymerize for 4 hours to obtain a clay anti-swelling agent for oil recovery. Its molecular structural formula is as follows:

[0011]

Embodiment 2

[0013] Use a 500ml glass reaction flask, install a stirrer, a thermometer and a nitrogen gas tube, add 220ml of distilled water, 129g of diallyl ammonium chloride and 21.5g of triallyl ethylenediamine, start stirring, fully dissolve completely, and pass in nitrogen , heating to raise the temperature, adding an initiator at 70-80°C, the initiator is potassium persulfate, the dosage is 0.05g, the polymerization reaction is 6h, and a clay anti-swelling agent for oil recovery is obtained. Its molecular structural formula is as follows:

[0014]

[0015]

[0016] Wherein the chemical structural formula of B is:

[0017]

Embodiment 3

[0019] Use a 500ml glass reaction flask, install a stirrer, a thermometer and a nitrogen gas tube, add 220ml of distilled water, 115g of diallyl ammonium chloride and 24g of triallylamine, start stirring, fully dissolve completely, pass in nitrogen, and heat up , adding an initiator at 75-80°C, the initiator is hydrogen peroxide (the concentration is 30%), the dosage is 0.4g, the polymerization reaction is 5h, and a kind of clay anti-swelling agent for oil recovery is obtained. Its molecular structural formula is as shown in Example 1.

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Abstract

The invention relates to a clay antiswelling agent for petroleum extraction and a preparation method thereof. The preparation method comprises the following steps of: dissolving 50-90 percent of diallyl ammonium chloride monomer and 10-50 percent of triallylamine monomer into distilled water according to mass proportion, wherein the total mass proportion concentration of the two monomers is 20-80 percent; adding into a reactor; charging nitrogen; adding initiator at 65-85 DEG C, wherein the initiator is ammonium persulfate, potassium persulfate or hydrogen peroxide; and reacting for 4-6 hours to obtain a polymer clay antiswelling agent for petroleum extraction, which has the molecular structure that three branch chains contain organic cations. The antiswelling agent has high inhibiting performance on clay, durable antiswelling effect, water scouring resistance and no damage to the stratum and can be used for water injection, acidification and well control fluid.

Description

technical field [0001] The invention relates to an oil field chemical agent-clay anti-swelling agent used in the construction of oil and gas recovery operations and a preparation method thereof, which is mainly used in water injection, acidification and well killing fluids. Background technique [0002] At present, the clay anti-swelling agent (also known as clay stabilizer) used in oil and gas exploration and construction has a wide variety of products, which can be summarized into several categories: ①Inorganic salts include potassium chloride, ammonium chloride, aluminum hydroxy, iron hydroxy etc.; ②Organic salts include guanidine hydrochloride, guanidine acetate, pyridinium salt, imidazoline salt, etc.; ③Organic cationic polymers include poly-2-hydroxypropyl dimethyl ammonium chloride, polydiallyl dimethyl ammonium chloride, cationic polyacrylamide, epichlorohydrin-polyethylene polyamine polycondensate, polyacrylamide ethyl acryl trimethylammonium chloride, etc. Inorgan...

Claims

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Application Information

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IPC IPC(8): C08F226/04C09K8/035
Inventor 乔孟占
Owner PETROCHINA CO LTD
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