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Star polymer for drilling fluid and preparation method of star polymer

A star-shaped polymer and drilling fluid technology, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of decreased fluid loss reduction effect of drilling fluid, changes in rheological properties of drilling fluid, and abnormal drilling work, etc. question

Active Publication Date: 2021-09-10
SHANDONG NUOER BIOLOGICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the oil well is in an environment above 150°C, the fluid loss reduction effect of the drilling fluid is significantly reduced. In order to ensure the fluid loss reduction effect, the amount of oilfield chemicals must be increased. The rheological properties will also change greatly, so that the drilling work cannot be carried out normally

Method used

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  • Star polymer for drilling fluid and preparation method of star polymer
  • Star polymer for drilling fluid and preparation method of star polymer
  • Star polymer for drilling fluid and preparation method of star polymer

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preparation example Construction

[0033] Such as figure 1 Shown, the invention provides a kind of preparation method of drilling fluid star polymer, and this preparation method comprises the steps:

[0034] (1) Add cationic monomer and bentonite to deionized water and stir to obtain a mixed solution;

[0035] (2) Add nonionic monomers, anionic monomers, tertiary amino monomers and the mixed solution into deionized water, stir and mix well, then add an initiator to initiate the polymerization reaction, and obtain the star polymerization for the drilling fluid things.

[0036] In a preferred embodiment, in step (1), cationic monomer and bentonite are added to deionized water and heated at 20-30°C (for example, 20°C, 22°C, 25°C, 28°C or 30°C) Stir and mix to obtain a mixed solution;

[0037] In the present invention, a two-step method is adopted, first cationic monomers are inserted into the layered structure of bentonite by ion exchange to obtain the core structure of the star-shaped polymer, so as to provide...

Embodiment 1

[0074] (1) Add 30g of cationic monomer (methacryloyloxyethyltrimethylammonium chloride) and 10g of bentonite (sodium bentonite) into 60g of deionized water and stir at 25°C for 2 hours to obtain a mixed solution ;

[0075] (2) Mix 200g of nonionic monomer (methacrylamide), 100g of anionic monomer (2-acrylamido-2-methylpropanesulfonic acid), 20g of tertiary amino monomer (dimethylaminomethacrylate) ethyl ester) and 100g of the mixed solution obtained in step (1) were added to 580g of deionized water and stirred to obtain a reaction solution, the temperature of the reaction solution was adjusted to 10°C, and the pH of the reaction solution was adjusted to The value is adjusted to 6.5, then feed nitrogen for 30min, then add initiator to initiate polymerization and react for 4h to obtain the star-shaped polymer for drilling fluid;

[0076] Wherein, the initiator includes 0.035g oxidizing agent (potassium persulfate), 0.035g reducing agent (sodium bisulfite), 0.05g complexing agen...

Embodiment 2

[0078] (1) Add 30g of cationic monomer (methacryloyloxyethyltrimethylammonium chloride) and 10g of bentonite (sodium bentonite) into 60g of deionized water and stir at 25°C for 2 hours to obtain a mixed solution ;

[0079] (2) Mix 220g of nonionic monomer (methacrylamide), 80g of anionic monomer (2-acrylamido-2-methylpropanesulfonic acid), 20g of tertiary amino monomer (dimethylaminomethacrylate) ethyl ester) and 100g of the mixed solution obtained in step (1) were added to 580g of deionized water and stirred to obtain a reaction solution, the temperature of the reaction solution was adjusted to 10°C, and the pH of the reaction solution was adjusted to The value is adjusted to 6.6, then feed nitrogen for 20 minutes, then add an initiator to initiate polymerization and react for 5 hours to obtain the star-shaped polymer for drilling fluid;

[0080]Wherein, the initiator includes 0.035g oxidizing agent (potassium persulfate), 0.035g reducing agent (sodium bisulfite), 0.05g comp...

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Abstract

The invention relates to the technical field of oil exploitation, and in particular, relates to a star polymer for drilling fluid and a preparation method of the star polymer. The method comprises the steps: adding a cationic monomer and bentonite into deionized water, and uniformly stirring and mixing to obtain a mixed solution; and adding a nonionic monomer, an anionic monomer, a tertiary amine monomer and the mixed solution into deionized water, uniformly stirring and mixing, and then adding an initiator to initiate a polymerization reaction to obtain the star polymer for the drilling fluid. The prepared star polymer for the drilling fluid is a star polymer with a dendritic branch chain, and has excellent high temperature resistance.

Description

technical field [0001] The invention relates to the technical field of polymer polymerization, in particular to a star-shaped polymer for drilling fluid and a preparation method thereof, which can be applied to the technical field of petroleum exploitation. Background technique [0002] With the increase of oil production, many oil fields have entered high-temperature deep oil production areas, and the difficulty of extraction is becoming more and more difficult. Deep and ultra-deep well drilling has gradually become an important technical means for the development of deep oil and gas reservoirs. Therefore, the high temperature resistance of drilling fluids is also required. Higher and higher. At present, most of the drilling fluids used in the field are polyacrylamide and its derivatives, which generally have the defect of easy degradation at high temperature, and the service temperature is generally lower than 140°C, which is difficult to be used in deep well development. ...

Claims

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Application Information

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IPC IPC(8): C08F292/00C08F220/56C08F220/58C08F220/34C09K8/03
CPCC08F292/00C08F4/40C09K8/03C08F220/34C08F220/56C08F220/585
Inventor 荣敏杰任凯许永升于庆华荣帅帅
Owner SHANDONG NUOER BIOLOGICAL TECH
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