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Modified crosslinked maleic anhydride-1-octadecene alternating copolymer and its preparation method and use

A technology of alternating copolymer and maleic anhydride, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of increasing the amount of polluted environment, reducing the drilling speed of bitumen fluid loss reducer, etc., and achieves good compatibility performance, improve the effect of reducing filtration loss, and reduce the effect of cost

Active Publication Date: 2021-11-16
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are fewer fluid loss control agents for oil-based drilling fluids than for water-based drilling fluids, and they are mainly divided into polymers, humic acid amines, lignin and asphalt products, of which asphalt Fluid loss additives have the advantages of wide selection of materials and low price, and have been widely used in the past period of time. However, asphalt fluid loss additives have the disadvantages of reducing drilling speed, polluting the environment, and large dosage. They are widely used in environmentally sensitive areas in China. In oil-based drilling fluid formulations in most parts of the country and abroad, its use has been restricted

Method used

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  • Modified crosslinked maleic anhydride-1-octadecene alternating copolymer and its preparation method and use
  • Modified crosslinked maleic anhydride-1-octadecene alternating copolymer and its preparation method and use
  • Modified crosslinked maleic anhydride-1-octadecene alternating copolymer and its preparation method and use

Examples

Experimental program
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Effect test

Embodiment 1

[0034] (1) Synthesis of maleic anhydride-1-octadecene alternating copolymer

[0035] Mix 4.9g of maleic anhydride and 12.5g of 1-octadecene with 17g of toluene, dissolve under magnetic stirring and pass nitrogen gas for 30min, add 0.35g of dibenzoyl peroxide (BPO) and raise the temperature to 95°C for 6h, rotate After evaporating the solvent and concentrating, it was washed with ethanol precipitation and dried to obtain about 17 g of white powder.

[0036] (2) Synthesis of Alternating Copolymer of Maleic Anhydride-1-Octadecene Modified by Polyenylamine

[0037] The maleic anhydride-1-octadecene alternating copolymer that 3.5g step (1) gained is dissolved in 80mL chloroform, and 1.89g tetraethylene pentamine is dissolved in the 20mL chloroform solution, to maleic anhydride-1-deca The tetraethylenepentamine solution in chloroform was added dropwise to the chloroform solution of the octadecene alternating copolymer, reacted at 40° C. for 4 hours, and was spin-dried to obtain a y...

Embodiment 2

[0039] The difference between this example and Example 1 is only that the amount of tetraethylenepentamine used in step (2) is 0.36g.

Embodiment 3

[0041] The only difference between this embodiment and embodiment 1 is: the amount of tetraethylenepentamine used in step (2) is 0.95g.

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Abstract

A modified cross-linked maleic anhydride-1-octadecene alternating copolymer and its preparation method and application. The modified cross-linked maleic anhydride-1-octadecene alternating copolymer has a chemical structure as shown in formula (I), wherein, m=0, 1, 2 or 3, n is 40-50. The preparation method comprises performing a modified cross-linking reaction on the maleic anhydride-1-octadecene alternating copolymer and polyenamine to obtain the modified and cross-linked maleic anhydride-1-octadecene alternating copolymer. The modified cross-linked maleic anhydride-1-octadecene alternating copolymer of the present application has good fluid loss control effect and can be used as a fluid loss control agent for drilling fluid.

Description

technical field [0001] This article relates to the synthesis technology of copolymers, especially a modified cross-linked maleic anhydride-1-octadecene alternating copolymer and its preparation method and application. Background technique [0002] The ever-increasing demand for oil puts forward requirements for industrially exploiting more difficult-to-develop and undeveloped reservoirs. Drilling fluid is a circulating flushing medium used in the well during the drilling process. Its function is to take out cuttings, cool and lubricate drilling tools, maintain wellbore stability, and balance formation pressure. There are a large number of high-temperature and high-pressure oil and gas fields in my country, and their extreme conditions make mining operations extremely difficult. Oil-based drilling fluids are more and more widely used in drilling deep and ultra-deep wells because of their advantages such as high temperature resistance, salt and calcium intrusion resistance, w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F8/32C08F210/14C08F222/06C09K8/035
CPCC08F8/32C09K8/035C08F210/14C08F222/06
Inventor 赵春花孙强耿铁王伟陈晏如罗健生李自立苗海龙谭业邦刘刚吴若楠
Owner CHINA NAT OFFSHORE OIL CORP