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High-temperature-resistant star-shaped polymer filtrate reducer, preparation method thereof and water-based drilling fluid

A star-shaped polymer, water-based drilling fluid technology, used in drilling compositions, chemical instruments and methods, etc., can solve the problems of poor high temperature resistance and poor filtration performance.

Active Publication Date: 2021-11-30
GUANGDONG ZHANJIANG PROVINCIAL LAB OF SOUTHERN MARINE SCI & ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The main purpose of the present invention is to propose a high-temperature resistant star-shaped polymer fluid loss control agent and its preparation method, and water-based drilling fluid, aiming at solving the problem of poor high-temperature resistance and high temperature resistance of the water-based drilling fluid fluid loss control agent used in the prior art. The problem of poor fluid loss control performance

Method used

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  • High-temperature-resistant star-shaped polymer filtrate reducer, preparation method thereof and water-based drilling fluid
  • High-temperature-resistant star-shaped polymer filtrate reducer, preparation method thereof and water-based drilling fluid
  • High-temperature-resistant star-shaped polymer filtrate reducer, preparation method thereof and water-based drilling fluid

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preparation example Construction

[0061] see figure 1 , the present invention further proposes a method for preparing the above-mentioned high-temperature star-shaped polymer fluid loss control agent, comprising the following steps:

[0062] S10. Add the acid-binding agent and alkenyl phenol into the first solvent and mix evenly, then add hexachlorocyclotriphosphazene for reaction to obtain a macromolecular initiator.

[0063] In this step, a macromolecular initiator is mainly obtained, and a benzene ring and a carbon-carbon double bond are introduced on the surface of the hexachlorocyclotriphosphazene. The whole reaction is a substitution reaction, and the addition of alkenyl phenol is mainly to form free radicals, providing Reactive point, alkenyl phenol reacts with halogen elements on hexachlorocyclotriphosphazene on the one hand, and its carbon-carbon double bond can react with other functional monomers on the other hand, which plays a role in providing reaction sites, chain branches The role of the chain...

Embodiment 1

[0107] (1) In a 500mL three-neck round-bottomed flask equipped with a thermometer, a stirring rod and a nitrogen guide tube, disperse 60.08g of 4-vinylphenol and 0.40g of NaOH into 100mL of tetrahydrofuran and 100mL of N'N-dimethylformaldehyde Nitrogen gas was passed into the mixed solution of amides. Raise the temperature to 80°C, and slowly add 17.38g of hexachlorocyclotriphosphazene dropwise at 10mL / min using a peristaltic pump. After the dropwise addition, maintain the reaction temperature at 80°C, stir at 600rpm for 30h, and distill under reduced pressure after the reaction is completed The solvent was concentrated and precipitated with ether. The obtained precipitate was washed several times with ethyl acetate and distilled water, and the white precipitated macromolecular initiator obtained after vacuum drying at 60° C. for 10 h, the reaction principle is shown in formula (1).

[0108] Formula 1)

[0109] (2) In the 500mL three-neck round-bottomed flask equipped with...

Embodiment 2

[0117] (1) In a 500mL three-necked round-bottomed flask equipped with a thermometer, a stirring rod and a nitrogen guide tube, disperse 57.67g of 3-vinylphenol and 1.39g of anhydrous sodium carbonate into 220mL of N'N-dimethyl In formamide, bubble nitrogen. Raise the temperature to 75°C, and slowly add 13.91g of hexachlorocyclotriphosphazene dropwise at 8mL / min using a peristaltic pump. After the dropwise addition, maintain the reaction temperature at 75°C and stir at 400rpm for 22h. After the reaction is completed, distill under reduced pressure to The solvent was concentrated and precipitated with ether. The obtained precipitate was washed several times with ethyl acetate and distilled water, and the white precipitated macromolecular initiator was obtained after vacuum drying at 50°C for 13 hours. The reaction principle is shown in formula (2).

[0118] Formula (2)

[0119] (2) In the 500mL three-necked round bottom flask that thermometer, stirring bar and nitrogen guide...

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Abstract

The invention discloses a high-temperature-resistant star-shaped polymer filtrate reducer, a preparation method thereof and a water-based drilling fluid, and relates to the technical field of oilfield chemistry. The high-temperature-resistant star-shaped polymer filtrate reducer comprises at least one of star-shaped polymers as shown in structural formulas (I), (II), (III), (IV), (V) and (VI). The star polymer contains rich anion and cation functional groups, shows an anti-polyelectrolyte effect and has excellent salt pollution resistance. Groups on a branched chain structure influence each other, and the high-temperature stability is enhanced. The stability of the polymer is further improved due to the steric hindrance effect among the branched chains. At high temperature, the secondary structure can still meet the requirement, the relative molecular mass is stable, and meanwhile, due to secondary groups generated by molecular breakage, the effective number of groups on a molecular chain is guaranteed. The high-temperature-resistant star-shaped polymer filtrate reducer can resist the temperature of 260 DEG C, the filter loss reduction rate is greater than 70%, and the high-temperature-resistant star-shaped polymer filtrate reducer can resist the pollution of 30% NaCl.

Description

technical field [0001] The invention relates to the technical field of oilfield chemistry, in particular to a high-temperature resistant star-shaped polymer fluid loss reducer, a preparation method thereof, and a water-based drilling fluid. Background technique [0002] With the continuous increase of global oil demand and the gradual exploitation of proven reserves, oil and gas exploration and development are gradually developing to deep layers, and the probability of drilling high-temperature and high-pressure formations is gradually increasing. Drilling practice shows that with the increase of well depth, drilling technical difficulties gradually increase. Downhole high temperature seriously affects the performance of drilling fluid, especially rheology and fluid loss control is difficult. The original drilling fluid treatment agent and drilling fluid system can no longer fully meet the requirements. To meet the needs of the development of deep well and ultra-deep well dr...

Claims

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Application Information

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IPC IPC(8): C08F226/02C08F220/58C08F220/56C08F230/02C08F220/34C08F228/02C08F212/14C09K8/035C09K8/12
CPCC08F226/02C08F220/34C08F220/56C08F212/26C09K8/035C09K8/12C08F220/585C08F230/02C08F228/02
Inventor 陈孝东高鑫杨京华钟汉毅朱江林邱正松刘云峰张海荣
Owner GUANGDONG ZHANJIANG PROVINCIAL LAB OF SOUTHERN MARINE SCI & ENG
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