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Star-structure copolymer for reducing filtration loss, preparation method and application of star-structure copolymer, drilling fluid and application of drilling fluid

A technology for copolymer and fluid loss reduction, applied in the field of drilling fluids, can solve the problem that the copolymer fluid loss reducer cannot have both temperature resistance and calcium resistance properties, etc., and achieves excellent fluid loss reduction effect, good high temperature resistance, good Anti-high calcium effect

Active Publication Date: 2021-06-25
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the defect that the existing copolymer fluid loss control agent cannot have both good temperature resistance and calcium resistance

Method used

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  • Star-structure copolymer for reducing filtration loss, preparation method and application of star-structure copolymer, drilling fluid and application of drilling fluid
  • Star-structure copolymer for reducing filtration loss, preparation method and application of star-structure copolymer, drilling fluid and application of drilling fluid
  • Star-structure copolymer for reducing filtration loss, preparation method and application of star-structure copolymer, drilling fluid and application of drilling fluid

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specific Embodiment approach

[0151] In the present invention, according to a particularly preferred embodiment, the preparation method of the copolymer comprises the following steps:

[0152] (1) Mixing the monomer A' with the aqueous solvent I, the conditions of the mixing I include: the temperature is 10-15°C, and the time is 10-30min;

[0153] (2) introducing the redox free radical initiation system into the product in step (1) to carry out free radical polymerization, the conditions of the free radical polymerization include: the temperature is 5-20°C, and the time is 12- 24h, the stirring speed is 100-400rpm;

[0154] (3) The monomer B', the monomer C', the monomer D', and the monomer E' are mixed II, and the conditions of the mixing II include: the temperature is 10-50°C, The time is 10-60min, the pH value is 7-9, and an inert atmosphere is optionally introduced and maintained;

[0155] (4) Introducing the product in step (3) into the product in step (2) to carry out free radical polymerization, t...

preparation example 1

[0211] Fluid loss reducer: Add 0.0166mol of nano-silica monomer A' into vacuum bottle I containing 50g of distilled water, ultrasonically disperse for 2h at a frequency of 40KHz, then cool down to 10°C with liquid nitrogen, and pass nitrogen for 30min, then Add the redox system ammonium persulfate / sodium bisulfite (mass ratio 1:1) aqueous solution of 2 weight ‰ of the mass of monomer A', and react at a stirring speed of 300 rpm at 10°C for 12 hours; add 0.1352 mol of 2-propene Amide-2-methylpropanesulfonic acid, 0.0564mol of N,N-dimethylacrylamide, 0.0504mol of N-vinylpyrrolidone and 0.1040mol of dimethyl diallyl ammonium chloride were added to a container containing 50g of distilled water In the vacuum bottle II, stir at 300rpm for 20min, adjust the pH value to 7 with sodium hydroxide aqueous solution, then use liquid nitrogen to cool down to 10°C, pass nitrogen gas for 30min, and then transfer the system in the vacuum bottle II to the vacuum bottle I. React for 12 hours; fre...

preparation example 2

[0213] This preparation example adopts the method similar to preparation example 1 to carry out, and difference is, in this preparation example, nano silicon dioxide monomer A ' is not carried out ultrasonic dispersion when mixing with distilled water;

[0214] Other conditions were the same, and the fluid loss control agent A2 was obtained.

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Abstract

The invention relates to the field of drilling in the petroleum industry, and discloses a star-structure copolymer for reducing filtration loss, a preparation method and application of the copolymer, drilling fluid and application of the drilling fluid. The copolymer contains a structural unit A, a structural unit B, a structural unit C, a structural unit D and a structural unit E, The copolymer is selected from at least one of structural units with structures as shown in a formula (1), a formula (2), a formula (3), a formula (4) and a formula (5), and the number-average molecular weight of the copolymer is 150,000-900,000; When the copolymer is used for a filtrate reducer of the drilling fluid, good high-temperature-resistant and high-calcium-resistant effects and an excellent filtrate reduction effect can be obtained, and the copolymer is suitable for deep well and ultra-deep well operation and can maintain relatively good borehole wall stability.

Description

technical field [0001] The invention relates to the field of drilling in the petroleum industry, in particular to a copolymer with a "star" structure for fluid loss control, a preparation method and application thereof, and a drilling fluid in which the copolymer is used as a fluid loss control agent and the application thereof. Background technique [0002] With the development of oil drilling technology and the decline of conventional oil and gas reserves, deep and ultra-deep oil and gas resources have become the focus of exploration and development. [0003] During the drilling process of deep wells and ultra-deep wells, due to the high temperature and high pressure environment in the downhole, the performance of drilling fluid will change greatly under the action of high temperature and high pressure, mainly because clay will undergo high temperature passivation under high temperature, and high temperature strengthens water molecules. The thermal movement reduces the ori...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F292/00C08F283/12C08F220/58C08F220/54C08F226/04C08F226/10C09K8/035C09K8/24
CPCC08F283/12C08F292/00C09K8/035C09K8/24C08F220/585C08F220/54C08F226/04C08F226/10
Inventor 杨丽丽敖天蒋官澄谢春林刘泽宇刘瀚卿孔德昌贺垠博马佳蓥何现波
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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