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Drag reducer, preparation method thereof and application of drag reducer

A drag reducer and initiator technology, which is applied in the field of drag reducer and preparation, can solve the problems of low dispersion ability and rheological performance, and achieve the effects of improving salt resistance, rheological performance, and dispersion ability

Inactive Publication Date: 2018-11-13
BC P INC CHINA NAT PETROLEUM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of low dispersibility and rheological properties in the prior art, the embodiment of the present invention provides a drag reducer, a preparation method and its application

Method used

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  • Drag reducer, preparation method thereof and application of drag reducer
  • Drag reducer, preparation method thereof and application of drag reducer
  • Drag reducer, preparation method thereof and application of drag reducer

Examples

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preparation example Construction

[0045] In a second aspect, a method for preparing a drag reducer is provided, the method comprising:

[0046]Add in sequence an unsaturated sulfonic acid monomer with a mass fraction of 10 to 60%, an unsaturated ester monomer with a mass fraction of 1 to 20%, a methacrylic acid monomer with a mass fraction of 1 to 15%, and a mass fraction of 10 to 30% of polyethylene glycol monomers containing saturated groups and 20% to 70% of polyethylene glycol monomers containing unsaturated groups in water (calculated based on the total mass of the monomers as 100%), stirred Until dissolved, adjust the pH to 1-9, place the system in a constant temperature water bath at 25°C and stir for half an hour, then raise the temperature to 55-95°C, add an initiator to react for 2-12 hours.

[0047] It should be noted that, in order to make each monomer more soluble in water, the above-mentioned unsaturated sulfonic acid monomers, unsaturated ester monomers, methacrylic acid monomers, polyethylene g...

Embodiment 1

[0072] This embodiment provides a drag reducer and a preparation method thereof.

[0073] Measure 400ml of water, add it into a four-necked bottle equipped with a stirrer and a thermometer, and add 20g of 2-acrylamido-2-methylpropanesulfonic acid, 10g of butyl methacrylate, 10 g of methacrylic acid, 20 g of methoxy polyethylene glycol (MPEG-600) and 40 g of allyl polyethylene glycol (APEG-2400) were stirred at room temperature until dissolved, and sodium hydroxide was added to adjust the pH to 4. Then put the four-necked bottle in a constant temperature water bath at 25°C and stir for half an hour, then raise the temperature of the water bath to 85°C, then add 0.25g of ammonium persulfate solution to the above mixture and react for 3 hours to obtain a drag reducer with a weight average molecular weight of 96,000 .

Embodiment 2

[0075] This embodiment provides a drag reducer and a preparation method thereof.

[0076] The difference between the preparation method of the drag reducer provided in this example and Example 1 is that the addition amount of 2-acrylamido-2-methylpropanesulfonic acid is 25g, the addition amount of butyl methacrylate is 8g, and the addition amount of allyl Base polyethylene glycol (APEG-2000) is 37g, obtains the drag reducer that weight average molecular weight is 85000.

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Abstract

The invention discloses a drag reducer, a preparation method thereof and an application of the drag reducer, and belongs to the technical field of well cementing. An unsaturated sulfonic acid monomer,an unsaturated ester monomer, a polyethylene glycol monomer containing a saturated group and a polyethylene glycol monomer containing an unsaturated group are polymerized to obtain the drag reducer,and the weight-average molecular weight of the drag reducer is 20000-120000. The drag reducer polymerized by the monomers is of a comb-type molecular structure, a main chain of the drag reducer has active groups such as a carboxylic acid group (-COOH) and a sulfonic acid group (-SO3H), the active groups can be effectively anchored on the surfaces of cement particles, a side chain of the drag reducer forms a solvation layer on the cement surface by the aid of polyethylene glycol macromolecular monomers, a network structure can be formed, the side chain is flexibly adsorbed on the surfaces of the cement particles in a comb shape manner, stereo-hindrance effect is obvious, the weight-average molecular weight of the drag reducer is controlled between 20000 and 120000, a high-density cement paste system containing salt can be effectively dispersed, and rheological properties can be improved.

Description

technical field [0001] The invention relates to the technical field of well cementing, in particular to a drag reducer, a preparation method and an application thereof. Background technique [0002] At present, oil fields such as Tarim, Xinjiang, and Yumen in my country, Halfaya and Missan oil fields in Iraq, Kenkiyak pre-salt oil fields in Kazakhstan, and oil fields on the right bank of the Amu Darya River in Turkmenistan have all encountered high-pressure brine Due to the particularity of pre-salt oilfields, the formation pressure is relatively high, and the creep and movement of salt will have a certain impact on cementing, and because sodium chloride (salt) is a strong Electrolyte can cause adverse phenomena such as coagulation acceleration, flash coagulation and super retardation in cement slurry. Therefore, a saline and high-density mud system must be used in cementing. Usually, drag reducers are added to this system to improve the salinity and high density. Rheological ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/58C08F220/18C08F220/06C04B24/16
CPCC04B24/165C04B2103/34C08F283/065C08F220/585C08F220/1804C08F220/06
Inventor 辛海鹏邹建龙曾建国孙富全王建瑶刘爱萍赵宝辉李鹏晓
Owner BC P INC CHINA NAT PETROLEUM CORP
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