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A kind of acid thickener and preparation method thereof

A technology of acid thickener and potassium persulfate, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of high friction resistance, high temperature resistance and poor shear resistance, and reduce friction resistance , high temperature resistance, easy to popularize and use

Active Publication Date: 2020-02-14
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The acid thickener provided by the prior art has high frictional resistance between the acid pump and high temperature resistance and poor shear resistance

Method used

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  • A kind of acid thickener and preparation method thereof
  • A kind of acid thickener and preparation method thereof
  • A kind of acid thickener and preparation method thereof

Examples

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preparation example Construction

[0035] In a second aspect, the embodiments of the present invention provide a method for preparing the above acid thickener, the method comprising the following steps:

[0036] Step 101, adding methacryloyloxyethyltrimethylammonium chloride, octadecyldimethylallylammonium chloride, and polyethylene glycol diacrylate into the reactor, and then adding deionized water, Prepare an aqueous solution with a mass concentration of 25%-40% of the total monomers, in which, methacryloyloxyethyltrimethylammonium chloride, octadecyldimethylallyl ammonium chloride, polyethylene glycol The mass ratio of alcohol diacrylate is 100:0.1-1:0.01-0.02.

[0037] Step 102, blow nitrogen into the reactor, then add an initiator, react at 20-30°C for 2-4h, then raise the temperature to 50-60°C, and continue the reaction to obtain a gel-like product.

[0038] Step 103, cutting the gel-like product into pieces, drying and pulverizing to obtain an acid thickener.

[0039] The preparation method of the aci...

Embodiment 1

[0058] This embodiment provides an acid thickener, by adding 140g of deionized water into a 500mL flask, and then adding 59.85g of methacryloyloxyethyltrimethylammonium chloride, after it is completely dissolved Add 0.15g octadecyldimethylallyl ammonium chloride, and then add 0.005g polyethylene glycol diacrylate after it dissolves completely, be mixed with the mass concentration of total monomer and be the aqueous solution of 30%, then in Nitrogen gas was passed into the flask, and 0.012 g of initiator potassium persulfate, 0.008 g of sodium bisulfite, and 0.01 g of azobisisobutylamidine hydrochloride were added, and nitrogen gas was continuously passed into the flask, and the flask was then placed in a thermostat at 20°C. React for 3 hours, then raise the temperature of the thermostat to 60°C, and continue the reaction for 3 hours to obtain a gel-like product, cut the gel-like product into pieces, dry it at 70°C, and then crush it into 80 meshes to obtain this example Acid t...

Embodiment 2

[0061] This embodiment provides an acid thickener, by adding 140g of deionized water into a flask with a volume of 500mL, and then adding 60g of methacryloyloxyethyltrimethylammonium chloride, and adding it after it is completely dissolved. 0.12g octadecyl dimethyl allyl ammonium chloride, after it is completely dissolved, add 0.006g polyethylene glycol diacrylate to prepare an aqueous solution with a mass concentration of 30.04% of the total monomer, and then add Nitrogen was passed into the flask, 0.014 g of initiator potassium persulfate, 0.012 g of sodium bisulfite, and 0.014 g of azobisisobutylamidine hydrochloride were added, and nitrogen gas was continued to be passed into the flask, and then reacted in a thermostat at 24°C. After 3 hours, the incubator was heated to 55°C, and the reaction was continued for 3 hours to obtain a gel-like product. The gel-like product was cut into pieces, dried at 78°C, and then crushed into 90 meshes to obtain the product provided in this ...

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Abstract

The invention discloses an acid liquid thickener and a preparation method thereof, and belongs to the technical field of oil field acidification. The acid liquid thickener has the following chemical structure formula described in the specification, wherein the value of x to y to z is (200000-300000) to (50-500) to (2-13), and n is an integer of 5-25. The viscosity-average molecular weight of the acid liquid thickener is 6000000-12000000. The acid liquid thickener has the characteristics of being capable of reduction of the friction resistance with an acid liquid pump, good high-temperature resistance, good shear resistance and the like.

Description

technical field [0001] The invention relates to the technical field of oil field acidification, in particular to an acid liquid thickener and a preparation method thereof. Background technique [0002] In the process of oilfield exploitation, heterogeneous oil layers have the characteristics of low porosity, low permeability, and low pressure, which affect the oil recovery rate of crude oil, and acidification stimulation is an important method for oil well stimulation. Among them, acidizing production stimulation is mainly to inject acid liquid into the formation through the wellbore, and then make the acid liquid react and dissolve with the rock cement in the oil layer or the soluble matter blocked in the pores and fractures of the formation, thereby increasing the pores and fractures and improving the oil formation Permeability, to achieve the purpose of oil well stimulation. But the H in the acid + The mass transfer rate is fast, and after being injected into the oil we...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/34C08F226/02C09K8/74
CPCC08F283/065C09K8/74C08F220/34C08F226/02
Inventor 吴文刚刘友权张燕杜国滨王小红
Owner PETROCHINA CO LTD
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