Sand inhibiting and antiswelling agent and preparation method thereof

A technology of anti-swelling agent and silane coupling agent, which is applied in the field of sand suppression and anti-swelling agent for oil-water well acidification and its preparation, and can solve the problems of poor synergy between anti-swelling agent and sand suppression agent, low anti-swelling rate and low sand suppression rate, etc. question

Inactive Publication Date: 2016-08-03
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in most compound systems, the anti-swelling agent and the anti-swelling agent have poor synergy, and there is mutual interference between the two, resulting in the same effective concentration, the anti-swelling rate of the anti-swelling and anti-swelling compound system is lower than that of the single anti-swelling agent , the sand suppression rate is lower than the single sand suppression agent

Method used

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  • Sand inhibiting and antiswelling agent and preparation method thereof
  • Sand inhibiting and antiswelling agent and preparation method thereof
  • Sand inhibiting and antiswelling agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1, weigh 23.32g of 1,2-ethylenediamine and add it into a four-neck flask. Turn on stir bar (medium speed) and condensed water. The water bath is filled with clear water to control the reaction temperature. Weigh 76.68g hydrochloric acid (effective content is 37%), join in the constant pressure funnel, control the opening degree of piston, make hydrochloric acid drip in the flask slowly. In this process, pay attention to controlling the rate of addition of hydrochloric acid not to be too fast, and ensure that the reaction temperature is always within 50°C. When the pH is between 5 and 6, stop the dropwise addition and continue the reaction for 0.5h. Then 2 g of a terpolymer of acrylamide, dimethyldiallylammonium chloride and 3-(methacryloyloxy)propyltrimethoxysilane are added. The temperature of the water bath was adjusted to 40° C., and the product was taken out after 6 hours of reaction to obtain a colorless viscous sand suppressing and anti-swelling agent p...

Embodiment 2

[0022] Example 2, weigh 30.85g of N,N-dimethylethylenediamine and add it into a four-neck flask. Turn on stir bar (medium speed) and condensed water. The water bath is filled with clear water to control the reaction temperature. Weigh 69.15g hydrochloric acid (effective content is 37%), join in the constant pressure funnel, control the opening degree of piston, make hydrochloric acid drip in the flask slowly. In this process, pay attention to controlling the rate of addition of hydrochloric acid not to be too fast, and ensure that the reaction temperature is always within 50°C. When the pH is between 5 and 6, stop the dropwise addition and continue the reaction for 0.5h. Then 2 g of a terpolymer of acrylamide, dimethyldiallylammonium chloride and vinyltrimethoxysilane are added. Adjust the temperature of the water bath to 45° C., and take out the product after reacting for 5 hours to obtain a light yellow viscous sand suppressing and antiswelling agent product with an effec...

Embodiment 3

[0023] Example 3, weigh 27.28g of 1,2-propanediamine, and add it into a four-necked flask. Turn on stir bar (medium speed) and condensed water. The water bath is filled with clear water to control the reaction temperature. Weigh 72.72g hydrochloric acid (effective content is 37%), join in the constant pressure funnel, control the opening degree of piston, make hydrochloric acid drip in the flask slowly. In this process, pay attention to controlling the rate of addition of hydrochloric acid not to be too fast, and ensure that the reaction temperature is always within 50°C. When the pH is between 5 and 6, stop the dropwise addition and continue the reaction for 0.5h. Then 2 g of a terpolymer of acrylamide, dimethyldiallylammonium chloride and vinyltris(2-methoxyethoxy)silane are added. The temperature of the water bath was adjusted to 50° C., and the product was taken out after 4 hours of reaction to obtain a transparent viscous anti-sand and anti-swelling agent product with ...

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Abstract

The invention discloses a sand-suppressing and anti-swelling agent and a preparation method thereof, which are used for acidizing oil-water wells. The sand suppressing and anti-swelling agent is formed by mixing amine salts and terpolymers produced by the reaction of organic amines and HCl in a molar ratio of 1:2, wherein the amine salts account for 98% of the total weight, and the terpolymers account for 98% of the total weight. 2% by weight. The ternary copolymer is a tripolymer of acrylamide monomer or 2-acrylamide-2-methylpropanesulfonic acid monomer, dimethyl diallyl ammonium chloride monomer and organosilane coupling agent. meta-copolymer. Tests show that the anti-swelling rate of the sand-suppressing and anti-swelling agent is higher than 85%, and the sand-suppressing rate is higher than 90%. It can not only effectively prevent clay expansion, but also effectively prevent and control fine silt sand production, and is suitable for acidizing operations in unconsolidated sandstone reservoirs with medium and low sand production intensity within 90 °C.

Description

technical field [0001] The invention relates to a sand suppressing and anti-swelling agent for oil-water well acidification and a preparation method thereof, belonging to the technical field of petrochemical industry. Background technique [0002] After multiple rounds of acidification in sandstone reservoirs, the cement between the sand grains of the rock skeleton is destroyed, and sand production is easy to occur near the wellbore, especially for unconsolidated sandstone reservoirs, which contain more fine silt and the sand production is more severe. Seriously, prevention and treatment are also more difficult. Sand production in oil and water wells will seriously affect the acidizing effect and greatly reduce the effective period of acidizing. In addition, acidizing operations will also increase the hydration swelling of clay. When the acid liquid flows through the clay minerals, it will dissolve the cement of the clay minerals, thereby increasing the expansion and dispe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/74
CPCC09K8/74C09K2208/12
Inventor 葛际江李侠清张贵才蒋平裴海华
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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