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A star-shaped polyacrylamide copolymer and its preparation method and drilling fluid

The technology of polyacrylamide copolymer and polyacrylamide is applied in the field of star-shaped polyacrylamide copolymer and its preparation method and drilling fluid, which can solve the problem of high viscosity of drilling fluid system, increase of cyclic pressure consumption, loss of filtration loss reduction To improve high temperature rheological properties, reduce pressure loss, and improve hydraulic parameters

Active Publication Date: 2018-07-03
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the process of deep drilling, the rheological properties of water-based drilling fluid are unstable and difficult to maintain. At the same time, the filtration loss of water-based drilling fluid increases greatly under the action of high temperature, and the intrusion of water into the reservoir will cause damage to the reservoir and cause borehole wall damage. Instability, manifested as the rheological properties of water-based drilling fluids in high-temperature environments are easily out of control
In the prior art, modified natural polymers and synthetic polymers are used to control the rheology and fluid loss of water-based drilling fluids at high temperatures. These polymers are all linear or branched linear water-soluble polymers. These linear The polymer either thermally degrades at high temperature and loses the fluid loss control effect, or the viscosity of the drilling fluid system is too high at high temperature, which reduces the shear dilution and wellbore cleaning ability of the drilling fluid, and affects the flow rate of the drilling fluid. Denaturation, increasing circulation pressure loss during drilling

Method used

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  • A star-shaped polyacrylamide copolymer and its preparation method and drilling fluid
  • A star-shaped polyacrylamide copolymer and its preparation method and drilling fluid
  • A star-shaped polyacrylamide copolymer and its preparation method and drilling fluid

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preparation example Construction

[0032] The present invention also provides a synthetic method for the star-shaped polyacrylamide copolymer, comprising the following synthetic steps:

[0033] Mixing pyromellitic dianhydride, azo 4-cyanopentanol, tetrahydrofuran, a nucleophilic catalyst and a dehydrating agent to perform an esterification reaction to obtain a tetrafunctional initiator;

[0034] After mixing the obtained four-functionality initiator, water, acrylamide and 2-acrylamide-2-methylpropanesulfonic acid, the copolymerization reaction is carried out under anaerobic conditions to obtain star-shaped polyacrylamide having the structure shown in formula I copolymer.

[0035] The invention mixes pyromellitic dianhydride, azo 4-cyanopentanol, tetrahydrofuran, a nucleophilic catalyst and a dehydrating agent to carry out esterification reaction to obtain a tetrafunctional initiator.

[0036] In the present invention, it is preferred to firstly mix pyromellitic dianhydride, azo 4-cyanopentanol and tetrahydrofu...

Embodiment 1

[0058] Dissolve 2.0 g of pyromellitic dianhydride and 4.0 g of azo 4-cyanopentanol in 20 mL of anhydrous tetrahydrofuran, add catalyst 4-dimethylaminopyridine (DMAP) 100 mg and dehydrating agent 1,3-dicyclohexyl Carboimide (DCC) 500 mg was reacted at room temperature for 24 hours to obtain an esterification reaction solution, which was distilled and dried to obtain a tetrafunctional initiator.

[0059] Then 30 mg of the four-functionality initiator synthesized above was dissolved in deionized water, 32 g of acrylamide monomer (AM) and 7.24 g of 2-acrylamide-2-methylpropanesulfonic acid (AMPS) were added to the system, and NaOH was used to Neutralize until the pH is 7. After the system is completely dissolved, pass argon and vacuumize for several times to remove oxygen. Then put the reaction system in a 70°C water bath. After reacting for 8 hours, add absolute ethanol to precipitate the precipitate, and then remove it by suction filtration. solvent, put it into a vacuum drying ...

Embodiment 2

[0063] Dissolve 2.0 g of pyromellitic dianhydride and 8.0 g of azo 4-cyanopentanol in 30 mL of anhydrous tetrahydrofuran, add 200 mg of catalyst 4-dimethylaminopyridine (DMAP) and 750 mg of dehydrating agent 1,3-bicyclo Hexylcarboimide (DCC) was reacted at room temperature for 24 hours, and the product was dried by distillation to obtain a tetrafunctional initiator.

[0064] Then 30 mg of the tetrafunctional initiator synthesized above was dissolved in 10 mL of deionized water, 35 g of acrylamide monomer (AM) and 8 g of 2-acrylamide-2-methylpropanesulfonic acid (AMPS) were added to the system, and NaOH was used to Neutralize until the pH is 6.5. After the system is completely dissolved, pass argon, vacuumize and replace several times to remove oxygen. Then put the reaction system in a water bath at 75°C. After reacting for 10 hours, add absolute ethanol to precipitate the precipitate, and then remove it by suction filtration. Solvent, put it into a vacuum drying oven to dry to...

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Abstract

The invention provides a star-shaped polyacrylamide copolymer, a preparation method thereof, and a drilling fluid containing the star-shaped polyacrylamide copolymer. Only adding the star-shaped polyacrylamide copolymer in the drilling fluid can not only reduce the fluid loss of the drilling fluid, but also improve the high-temperature rheological properties of the drilling fluid and reduce the pressure of the drilling fluid circulation system in a high-temperature environment loss.

Description

technical field [0001] The invention relates to the technical field of drilling fluids, in particular to a star-shaped polyacrylamide copolymer, a preparation method thereof and drilling fluids. Background technique [0002] Drilling fluid refers to the general term of various circulating fluids that meet the needs of drilling work during the drilling process. It is an important part of drilling engineering. The drilling success of oil and gas and geothermal resources depends largely on the properties of the drilling fluid. [0003] Rheology is an important property of drilling fluid, which refers to the performance of flow and deformation of drilling fluid under the action of external stress. Rheological properties have an important influence on the mechanical speed, carrying cuttings, keeping the bottom hole and borehole clean, and suspending cuttings and barite. Filtration performance refers to the phenomenon that the free water in the drilling fluid permeates into the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F220/58C09K8/035C09K8/24
CPCC09K8/88C08F220/56C09K8/24C08L33/26C08L2205/14C08L41/00
Inventor 罗志华幸雪松于培志王瑜夏柏如王子明
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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