Pre-crosslinking expansion-particle leakage-stopping agent for drilling and preparation method of pre-crosslinking expansion-particle leakage-stopping agent

A technology of bulky granules and pre-crosslinking, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of severe polymerization reaction, inconvenient operation and control, etc., and achieve good toughness, easy operation and control, and smooth reaction Effect

Inactive Publication Date: 2015-05-06
HEBEI GUANGDA PETROCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the participation of acrylic acid monomers in this method, the polymerization reaction is relatively violent, which is not convenient for operators to operate and control.

Method used

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  • Pre-crosslinking expansion-particle leakage-stopping agent for drilling and preparation method of pre-crosslinking expansion-particle leakage-stopping agent
  • Pre-crosslinking expansion-particle leakage-stopping agent for drilling and preparation method of pre-crosslinking expansion-particle leakage-stopping agent
  • Pre-crosslinking expansion-particle leakage-stopping agent for drilling and preparation method of pre-crosslinking expansion-particle leakage-stopping agent

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preparation example Construction

[0025] The preparation method of the pre-crosslinked volume expansion particle plugging agent for drilling, the preparation process comprises the following steps:

[0026] 1) Fully dissolve acrylamide in water to obtain a feed solution with a mass concentration of acrylamide not less than 30%;

[0027] 2) Add sodium carbonate to the feed solution obtained in step 1), the mass ratio of sodium carbonate to acrylamide is 1:10, and mix and stir for 30 minutes;

[0028] 3) Add the mixed liquid obtained in step 2) into the reaction kettle, pass nitrogen protection, and stir thoroughly for 10 minutes; then add the initiator to the mixed liquid, continue stirring for 10 to 15 minutes, stop stirring and pass nitrogen, and seal Stand for 6 hours;

[0029] 4) Raise the temperature of the reactor to 60~90°C and keep the temperature for 6 hours to obtain the colloid;

[0030] 5) Press the colloid obtained in step 4) into a granulator to granulate, and the particle size is 2~6mm;

[0031...

Embodiment 1

[0034] Take 200kg of acrylamide and prepare it into an acrylamide solution with a mass concentration of 30%; add 20kg of sodium carbonate to the acrylamide solution, mix and stir for 30 minutes, and acrylamide undergoes a homopolymerization reaction; add the above mixed solution to the reaction In the kettle, feed nitrogen gas with a purity of not less than 99.5% into the reactor, and stir thoroughly for 10 minutes; then add 4 kg of initiator ammonium persulfate to the mixed solution, continue stirring for 10 minutes, stop stirring and stop feeding nitrogen, and seal Stand still for 6 hours, the copolymerization reaction takes place; 6 hours, the reaction kettle is heated to 60 ℃, and the heat preservation is 6 hours, hydrolysis reaction occurs, and the colloid is obtained; the colloid is moved into the granulator to granulate, and the particle size obtained is 2 mm; The conveying fan is sent into the kneader, and 4kg of 2-acrylamide-2-methylpropanesulfonic acid, 20kg of...

Embodiment 2

[0036] Take 280kg of acrylamide, and prepare it into an acrylamide solution with a mass concentration of 30%; add 28kg of sodium carbonate to the acrylamide solution, mix and stir for 30 minutes, and acrylamide undergoes a homopolymerization reaction; add the above mixed solution to the reaction In the kettle, feed nitrogen gas with a purity of not less than 99.5% into the reactor, and stir thoroughly for 10 minutes; then add 6 kg of initiator potassium persulfate to the mixed solution, continue stirring for 10 minutes, stop stirring and stop feeding nitrogen, and seal Stand still for 6 hours, the copolymerization reaction takes place; 6 hours later, the reaction kettle is heated up to 90 ℃, and it is incubated for 6 hours, and the hydrolysis reaction occurs to obtain the colloid; the colloid is moved into the granulator to granulate, and the particle size obtained is 4mm; The conveying fan is sent into the kneader, and 6kg of 2-acrylamide-2-methylpropanesulfonic acid, 2...

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Abstract

The invention relates to a pre-crosslinking expansion-particle leakage-stopping agent for drilling. The pre-crosslinking expansion-particle leakage-stopping agent is formed by polymerizing materials and comprises the following materials in parts by weight: 200-280 parts of acrylamide, 4-6 parts of 2-acrylamide-2-methyl propane sulfonic acid, 20-26 parts of acryloyl-oxy-ethyl-trimethyl ammonium chloride, 4-6 parts of delaying-crosslinking agent and 4-6 parts of initiating agent. The invention also relates to a preparation method of the pre-crosslinking expansion-particle leakage-stopping agent. The pre-crosslinking expansion-particle leakage-stopping agent has high anti-extrusion strength, good toughness, good temperature resistance and slower water-absorbing expansion rate, and has certain delaying and expanding characteristics; and the preparation method is mild in reaction, is easy in operation and control and is safe and reliable.

Description

technical field [0001] The invention relates to a plugging agent for well drilling and a preparation method thereof, in particular to a pre-crosslinked particle swelling plugging agent for drilling and a preparation method thereof. Background technique [0002] Lost circulation accidents during the drilling process are very harmful and often cause the entire wellbore to be scrapped. It is very important to use effective plugging methods to prevent such accidents. Usually, the method of bridging plugging is used for operation. This method is simple to operate and The cost is low, but this method has the problem of poor plugging effect or repeated leakage. In recent years, pre-crosslinked bulky particles have a good plugging effect on large pores that appear during drilling because of their water-absorbing and swelling properties. [0003] Pre-crosslinked expanded particles refer to dried solid polymer gel substances, sometimes called "xerogels". It is a polymer water-absorbe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/42C08F220/56C08F220/58C08F220/34C08F222/38
CPCC08F220/56C08F220/585C09K8/42C08F220/58C08F220/34C08F222/385
Inventor 李尚坤郭九成郭杨高国英罗前程刘君君张宇航张星赤艳峰
Owner HEBEI GUANGDA PETROCHEM
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