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A kind of hyperbranched copolymer and its preparation method and application

A technology of hyperbranched copolymers and polymers, applied in chemical instruments and methods, drilling compositions, etc., can solve the problem of strong polymer flocculation, reduced ability of treatment agent drilling fluid filtration, resistance to high-valent metal ions, etc. There are no problems such as great progress in pollution, and the effects of good water solubility and improved temperature and salt resistance are achieved.

Active Publication Date: 2016-08-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the 1990s, amphoteric compound ionic drilling fluid treatment agents and drilling fluid systems appeared again. Compared with anionic polymers, zwitterionic polymers have improved in flocculation and anti-slump, but in improving the temperature and resistance of products. Salt, especially against contamination by high-valent metal ions, has not made great strides
In order to improve the problem of insufficient temperature and salt resistance of traditional zwitterionic polymers, especially on the basis of ensuring temperature and salt resistance, it is also required to have better anti-slump inhibition, CN101429427A discloses a zwitterionic sulfonate polymer A preparation method of a drilling fluid treatment agent, the method uses a cationic monomer and an anionic monomer to copolymerize to obtain a zwitterionic polymer
Practice has proved that when cationic monomers are used as raw materials to prepare polymer treatment agents, when the amount of cationic monomers is small, the inhibition of the treatment agent is insufficient, and when the amount of cationic monomers is large, although the inhibitory ability of the treatment agent is improved, the polymerization If the flocculation effect of the material is too strong, the ability of the treatment agent to control the fluid loss of the drilling fluid will be reduced.

Method used

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  • A kind of hyperbranched copolymer and its preparation method and application
  • A kind of hyperbranched copolymer and its preparation method and application
  • A kind of hyperbranched copolymer and its preparation method and application

Examples

Experimental program
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preparation example Construction

[0091] According to the preparation method of the present invention, wherein, the dendritic polymer monomer I has a structure shown in formula (1) and / or formula (3), and in formula (1) and formula (3), R 1 for CH 2 CH 2 , R 2 -R 4 , R 8 -R 13 Both are H, M is Na, p and q are both 0.

[0092] The dendrimer monomers of the present invention can be prepared by a process comprising first preparing the corresponding dendrimer and then contacting the dendrimer with an unsaturated acid halide under condensation reaction conditions.

[0093] The contact reaction of the dendritic polymer with the unsaturated acid halide is preferably carried out in the presence of a solvent, and the contact conditions may include a temperature of 0-20° C. and a time of 0.5-10 h.

[0094] When the dendritic polymer has the structure shown in the above formula (III) and / or formula (IV), the preparation method of the dendritic polymer may include the following steps:

[0095] (1) Preparation of in...

Embodiment approach

[0131] According to a preferred embodiment of the present invention, the preparation method of the dendritic polymer monomer may include the following steps: adding the above-mentioned dendritic polymer, organic solvent and acid-binding agent into a reaction flask equipped with a cooling device, cooling to 5°C, and then slowly add the unsaturated acid halide (the temperature during the addition should not exceed 15°C). After adding the unsaturated acid halide, react at about 10°C for 0.5-8h. The reactant was left standing, the organic phase was separated, neutralized and washed several times with saturated sodium bicarbonate solution, dried with anhydrous sodium sulfate, and the organic solvent was evaporated to obtain the crude product, which was further purified to obtain the polymer grade The product is the dendrimer monomer.

[0132] The unsaturated acid halide can be unsaturated acid chloride and / or unsaturated acid bromide, the number of carbon atoms of the unsaturated a...

preparation example 1

[0164] Synthesis of intermediates.

[0165] First synthesize the intermediate according to the conventional method:

[0166] (I) Add methyl acrylate, ethanolamine and methanol in the reaction kettle according to the molar ratio of 1:0.5:15, at room temperature and through N 2 Stirring for 30 minutes under normal conditions, then raising the temperature to 35°C for 4 hours, and then distilling under reduced pressure to remove methanol to obtain a product with the structure shown in formula (5a).

[0167]

[0168] (II) Add the product with the structure shown in formula (5a) and methanol into the reaction kettle according to the weight ratio of 1:3, and add ethylenediamine (the mole of the product with the structure shown in formula (5a) The ratio is 1:1.05) after reaction for 24h, and then distilled under reduced pressure to remove methanol to obtain the intermediate product shown in the structure of formula (5b).

[0169]

[0170] (III) Add the intermediate product of ...

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Abstract

A kind of hyperbranched copolymer and its preparation method and application, it is characterized in that, this hyperbranched copolymer contains dendritic structural unit A, zwitterionic structural unit B, structural unit C and structural unit D, and by mole, dendritic Structural unit A: Zwitterionic structural unit B: Structural unit C: Structural unit D=0.03-0.35: 0.03-0.5: 0.03-0.3: 0.15-0.95, and the apparent viscosity of the 1% by mass aqueous solution of the hyperbranched copolymer is 20-60mPa·s. The hyperbranched copolymer provided by the present invention has good fluid loss control characteristics under high temperature (180°C) high salt (saturated brine) and high calcium (10% calcium chloride) conditions, while ensuring good drilling fluid suppression ability , has no adverse effect on the fluid loss of drilling fluid. The production cost of the product is low, the production speed is fast, the production efficiency is high, the product quality is stable, and the product has good water solubility and convenient on-site application.

Description

technical field [0001] The invention relates to a hyperbranched copolymer and its preparation method and application. Background technique [0002] In the process of oil drilling, the formations encountered are becoming more and more complex, and the number of special wells, ultra-deep wells and complex wells is increasing year by year, which puts forward higher requirements for drilling fluids. In the development of unconventional oil and gas represented by shale gas, in order to meet the needs of wellbore stability and lubrication and anti-sticking, 60% to 70% of shale gas horizontal wells abroad use oil-based drilling fluid system. Due to the high cost of oil-based drilling fluid and pollution to the environment, water-based drilling fluid is the final choice. Studies have shown that active shale at high concentrations of CaCl 2 Water loss (or dehydration) will occur in the aqueous solution. It can be seen that to meet the needs of shale gas horizontal well drilling, ex...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/00C08F220/36C08F220/38C08F220/60C08F220/54C08F220/58C08F2/04C09K8/12
Inventor 王中华
Owner CHINA PETROLEUM & CHEM CORP