Preparation method of low molecular weight clay stabilizer

A clay stabilizer, low molecular weight technology, used in chemical instruments and methods, drilling compositions, etc., can solve the problems of high temperature resistance, insufficient anti-swelling performance, etc.

Active Publication Date: 2014-10-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, such materials generally have the disadvantages of high t

Method used

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  • Preparation method of low molecular weight clay stabilizer
  • Preparation method of low molecular weight clay stabilizer
  • Preparation method of low molecular weight clay stabilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Add a certain amount of 90% acetic acid solution into a 0.5L three-necked flask, add a certain amount of 2-acrylamido-2-methylpropanesulfonic acid under stirring, continue stirring, and control a certain heating rate to heat the material to 90°C , stop heating, cool down with refrigerated brine, gradually cool the material to 8°C~10°C, keep it for 1h, filter the filtrate and 2-acrylamido-2-methylpropanesulfonic acid crystals, 2-acrylamido-2 -Methylpropanesulfonic acid crystals are used in the following experiments.

Embodiment 2

[0019] Add 200.0g of distilled water to a three-necked flask equipped with an electric stirrer, a reflux condenser and a thermometer, and cool it with a refrigerated liquid. Control the temperature in the three-necked flask at about 0°C, and then add 10.0g of dimethyldiallyl in a stirring state. ammonium chloride and 40.0g 2-acrylamido-2-methylpropanesulfonic acid crystals, stirred until completely dissolved, added a pH regulator, adjusted the pH of the reaction solution to be neutral, added 1.0g sodium sulfite-potassium persulfate to initiate Inject nitrogen for 30 minutes, raise the temperature and control the reaction temperature to 60°C, react under stirring for 3 hours, after the reaction is completed, vacuum dry and then pulverize to obtain the clay stabilizer product, the label is 1 # .

Embodiment 3

[0021] Add 200.0g of distilled water to a three-necked flask equipped with an electric stirrer, a reflux condenser and a thermometer, and cool it with a refrigerated liquid. Control the temperature in the three-necked flask at about 0°C, and then add 8.0g of diethyldiallyl in a stirring state. ammonium chloride and 40.0g 2-acrylamido-2-methylpropanesulfonic acid crystals, stirred until completely dissolved, added a pH regulator, adjusted the pH of the reaction solution to be neutral, added 0.5g sodium sulfite-ammonium persulfate to initiate Nitrogen gas was introduced for 30 minutes, the temperature was raised and the reaction temperature was controlled to be 35 °C, and the reaction was carried out under stirring for 6 hours. After the reaction was completed, the clay stabilizer product was obtained after vacuum drying and crushing, and the label was 2 # .

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Abstract

The invention belongs to the technical field of oil production engineering, and provides a preparation method of a low molecular weight polymer clay stabilizer. The clay stabilizer is prepared from raw materials of carbon-containing ammonium salt and 2-acrylamido-2-methyl propane sulfonic acid (AMPS) in the presence of an initiator in an aqueous solution through polymerization. The number average molecular weight of the polymer is less than 50000. The sulfonic acid group is introduced into the polymer stabilizer, so as to increase the water solubility and high temperature performance of the polymer. The stabilizer can form multiple point adsorption with a plurality of clay particles in the water; after adsorption, a layer of protective film is formed on the surface of clay particles to prevent expansion and migration of clay particles; and the stabilizer has the high temperature resistance performance reaching more than 120 DEG C.

Description

technical field [0001] The invention belongs to the technical field of oil recovery engineering and relates to a preparation method of a low molecular weight clay stabilizer. Background technique [0002] Clay minerals widely exist in oil reservoirs, and 97% of the oil reservoirs in the world contain clay minerals to varying degrees. Usually when the reservoir contains 5% to 20% clay, it is considered to be an oil layer with higher clay content. If the measures are not taken properly during the development process, the clay minerals will expand, disperse and migrate, thereby blocking the throat of the formation pore structure, reducing the permeability of the formation, and causing formation damage. In order to protect the permeability of oil and gas formations, chemical treatments must be used to stabilize clay minerals in the formation. Treatment agents that prevent clay minerals from swelling are called anti-clay swelling agents (anti-swelling agents). The treatment a...

Claims

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Application Information

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IPC IPC(8): C08F220/58C08F226/02C08F220/34C08F4/40C09K8/575
Inventor 袁俊秀封心领王康朱魁逯贵广徐冬梅
Owner CHINA PETROLEUM & CHEM CORP
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