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Acid fracturing thickening agent and preparation thereof

A technology of acid fracturing and thickening agent, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of insufficient high temperature resistance and shear resistance, and cannot meet the construction requirements, etc., to achieve easy control, The effect of low input cost and easy industrialization promotion

Inactive Publication Date: 2009-04-22
HIGH & NEW TECH RES CENT OF HENAN ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent 200510044932.7 and patent 200510033598.5 introduce binary copolymers as acid thickeners. The disadvantages are that the high temperature resistance and shear resistance are not enough to meet the construction requirements of high temperature, deep well and ultra-deep well.

Method used

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  • Acid fracturing thickening agent and preparation thereof
  • Acid fracturing thickening agent and preparation thereof
  • Acid fracturing thickening agent and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Add methacryloyloxyethyltrimethylammonium chloride, acrylamide, and 2-acrylamido-2-methylpropanesulfonic acid into the reactor at a mass ratio of 1:4:2, add water to make the monomer The mass percentage concentration is about 25%. After stirring and dissolving, add disodium ethylenediamine tetraacetate accounting for 0.5‰ of the total monomer mass, sodium bisulfite accounting for 0.37‰ of the total monomer mass, and then add 2.1mL of N, N / - Methylenebisacrylamide solution (weigh 0.2gN, N / -Methylenebisacrylamide, made into 100mL solution), adjust the pH value of the system to 8.5 with ammonia water, control the temperature at 18°C, pass nitrogen into the reaction mixture for 30 minutes, and add persulfuric acid accounting for 0.6‰ of the total monomer mass Ammonium, continue to pass nitrogen for 5 minutes, transfer the reaction mixture to a plastic bag, seal the plastic bag and place it in a constant temperature water bath at 40°C, and react for 20 hours to obtain a...

Embodiment 2

[0017] Add methacryloyloxyethyltrimethylammonium chloride, acrylamide, and 2-acrylamido-2-methylpropanesulfonic acid into the reactor at a mass ratio of 1:4.5:1.8, add water to make the monomer The mass percentage concentration is about 25%. After stirring and dissolving, add disodium ethylenediamine tetraacetate accounting for 0.37‰ of the total monomer mass, sodium bisulfite accounting for 0.33‰ of the total monomer mass, and then add 1.5mL of polyglycerol Acrylate solution (weigh 0.3g polyglycerol acrylate to make 100mL solution), adjust the pH value of the system to 8.5 with ammonia water, control the temperature at 20°C, pass nitrogen into the reaction mixture for 30 minutes, add 0.63‰ of ammonium persulfate, continue to pass nitrogen for 5 minutes, transfer the reaction mixture to a plastic bag, seal the plastic bag and place it in a constant temperature water bath at 40°C, and react for 20 hours to obtain a gel-like product. The product is taken out, sheared, granulated...

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Abstract

The invention discloses a novel acidified fractured thickening agent and a preparation method thereof, and belongs to the field of macromolecular synthesis. The thickening agent is prepared by the method comprising the following steps: adopting a water solution polymerizing method, oxidizing and reducing an evocating agent, adding proper amount of chain extender into a sealed system, and copolymerizing the mixture by the reaction of methacryloyloxy trimethyl-ammonium chloride (DMC), acrylamide (AM) and 2-acrylamido-2-methyl propane sulfonic acid (AMPS). The thickening agent has the advantages of acid resistance and high temperature resistance, has favorable thickening effect, and is applied to the fields of acidified fracturing construction, strengthening oil extraction work and the like in petroleum extraction.

Description

technical field [0001] The invention relates to an auxiliary agent for oilfields, in particular to a novel ternary copolymerization acidification fracturing thickener and a preparation method thereof. Background technique [0002] Deep acid fracturing is one of the key technologies for stimulation of carbonate reservoirs, in which the acid system plays a vital role. Densified acid fracturing is the main technological measure for increasing production of carbonate reservoirs. Densified acid fracturing has a good effect on medium, high or even low permeability with fractures. The key to the success of acid fracturing operation mainly depends on the conductivity of the fracture and the length of the acid-etched fracture, and the length of the acid-etched fracture is affected by the acid. Control of fluid loss characteristics and acid-rock reaction rate. Adding a thickener with good performance to the acid liquid can increase the viscosity of the acid liquid and reduce the mas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/74C08F220/56
Inventor 张国宝庄玉伟曹健王颖崔文娟赵根锁
Owner HIGH & NEW TECH RES CENT OF HENAN ACAD OF SCI
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