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Hyperbranched polymer and preparation method thereof, and application of hyperbranched polymer in preparation of drilling fluid

A technology of hyperbranched polymers and monomers, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of affecting the stability of the drilling fluid system, difficult to provide fluid loss control, insufficient high temperature stability, etc., to achieve The polymerization reaction is easy to control, the fluid loss reduction ability is strong, and the effect of good temperature resistance

Inactive Publication Date: 2020-05-19
中石化石油工程技术服务有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This type of polymer has certain temperature resistance, but has the disadvantages of large viscosity effect and insufficient high temperature stability, which easily affects the stability of drilling fluid system
Moreover, in high-concentration brine drilling fluids or composite brine drilling fluids, at high temperatures (150°C), it is usually difficult for a single polymer fluid loss control agent to provide effective fluid loss control

Method used

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  • Hyperbranched polymer and preparation method thereof, and application of hyperbranched polymer in preparation of drilling fluid
  • Hyperbranched polymer and preparation method thereof, and application of hyperbranched polymer in preparation of drilling fluid
  • Hyperbranched polymer and preparation method thereof, and application of hyperbranched polymer in preparation of drilling fluid

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preparation example Construction

[0030] The raw materials for the preparation of the polymer provided by the present invention include organic acid monomers and acrylamide (AM) monomers, wherein the organic acid monomers are 2-acrylamido-2-methylpropanesulfonic acid (AMPS) and one or more of 2-acryloyloxy-2-methylpropanesulfonic acid.

[0031] The invention adopts N,N-methylenebisacrylamide as a branching agent to form a hyperbranched polymer. Moreover, the present invention uses one or more of 4-cyanopentanoic acid dithiobenzoate and (3-benzylmercaptothiocarbonylthio)propionic acid as the chain transfer agent. The present invention adopts the reversible addition-fragmentation chain transfer radical polymerization method (RAFT polymerization method), and adds a chain transfer reagent with a high chain transfer constant to the traditional radical polymerization system to achieve the purpose of "active" polymerization and realize a random hyperbranched structure . The polymer of the invention has low viscosit...

Embodiment 1

[0051] Add 66g of 2-acrylamido-2-methylpropanesulfonic acid to 300g of water, adjust the pH value to 6 with 40% sodium hydroxide solution after fully dissolving, add 34g of acrylamide, 0.10g of N,N-methylene Bisacrylamide, 0.263g 4-cyanopentanoic acid dithiobenzoate, nitrogen for 20min, slowly add 0.15g ammonium persulfate and 0.15g sodium bisulfite initiator under constant stirring, at 35°C After heat preservation for 12 hours, 92.0 g of viscous water-soluble branched polymer fluid loss control agent was obtained.

Embodiment 2

[0053] Add 24g of 2-acryloyloxy-2-methylpropanesulfonic acid to 300g of water, adjust the pH value to 7 with 40% sodium hydroxide solution after fully dissolving, add 76g of acrylamide, 0.3g of N,N-methylene Base bisacrylamide, 0.42g (3-phenylmethylmercaptothiocarbonylthio)propionic acid, nitrogen gas 20min, slowly add 0.2g ammonium persulfate and 0.2g sodium bisulfite initiator under constant stirring, at 40 ℃ After heat preservation for 8 hours, 90 g of viscous water-soluble branched polymer fluid loss control agent was obtained.

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Abstract

The invention provides a hyperbranched polymer and a preparation method thereof, and applications of the hyperbranched polymer in preparation of a drilling fluid. The preparation method comprises thefollowing steps: mixing an organic acid monomer, acrylamide, N,N-methylene bisacrylamide and a chain transfer agent, and carrying out a copolymerization reaction in water under the action of a pH regulator and an initiator to obtain a hyperbranched polymer with a random hyperbranched structure, wherein the organic acid monomer is 2-acrylamido-2-methylpropanesulfonic acid and / or 2-acryloyloxy-2-methylpropanesulfonic acid, the chain transfer agent is 4-cyanovaleric acid dithiobenzoate and / or (3-phenylmethylmercaptothiocarbonyl sulfide) propionic acid, and the mass ratio of the organic acid monomer to the acrylamide to the N,N-methylene bisacrylamide to the chain transfer agent is (24-66):(34-76):(0.1-5):(0.21-7). The hyperbranched polymer is good in temperature resistance, high in filtrate loss reduction capacity and beneficial to application in drilling fluid.

Description

technical field [0001] The invention belongs to the technical field of petroleum drilling and oilfield chemical high molecular polymers, and in particular relates to a hyperbranched polymer, its preparation method and its application in preparing drilling fluid. Background technique [0002] Drilling fluid is a circulating flushing medium used in the drilling process, mainly composed of dispersion medium (continuous phase), dispersed phase and additives. According to different fluid media, drilling fluid can be generally divided into three types: water-based drilling fluid, oil-based drilling fluid and gas-based drilling fluid. The performance and technical indicators of drilling fluid include many items, such as density, viscosity, shear force and fluid loss, etc. In the process of oil drilling, with the increasingly complex formations encountered and the increase in the number of special wells, ultra-deep wells and complex wells, higher and higher requirements are placed ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F222/38C08F220/58C09K8/035C08F2/38
CPCC08F220/56C08F220/58C09K8/035C08F2/38C08F2438/03
Inventor 孙举王中华苏雪霞梁庆磊胡晓燕孟丽艳
Owner 中石化石油工程技术服务有限公司
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