Thickening agent for cleaning foamed fracturing fluid and preparation method of thickening agent

Abstract

The invention discloses a thickening agent for cleaning foamed fracturing fluid and a preparation method of the thickening agent. The thickening agent comprises the following components in percentage by weight: 5-6% of N,N'-methylene bisacrylamide MBA, 15-18% of a basic functional monomer, 3-5% of a specific functional monomer, 2-3% of a cationic polymerizable amphiphilic monomer, 3-5% of a regulator, 5-10% of an ionic activating agent, 2-4% of a dissolution accelerant, 0.08-0.15% of an initiating agent, and the balance of deionized water. The preparation method of the thickening agent comprises the steps of adding the above components into a reaction kettle to perform aqueous solution multi-component copolymerization, and preparing a polymer product by virtue of a certain post-treatment process. The thickening agent disclosed by the invention has a good viscidity increasing ability, and is good in solution viscoelasticity and heat-shearing resistance; the polymer, after being used as a thickening agent for N2 and CO2 foamed fracturing fluid, has good foaming property and foam stability; and the foamed fluid itself does not need to act with a high-valence metal crosslinking agent, and greatly reduces undissolved substance residue damages caused by water sensitivity, water blocking damages and the thickening agent, so that the fracturing construction effect can be greatly improved.

Description

technical field

[0001] The invention relates to the technical fields of supramolecular chemistry and oilfield chemicals, in particular to a clean foam fracturing fluid thickener for fracturing stimulation measures and a preparation method thereof. Background technique

[0002] Among the proven oil and gas resources in my country, low-permeability oil and gas resources account for a relatively large proportion. The development of such oil and gas fields is of great significance to the sustainable and stable development of my country's petroleum industry in the future. However, many problems such as fluid loss, formation damage, water lock, and flowback are prone to occur during the hydraulic fracturing development process. Foam fracturing fluid, as a new type of fracturing fluid system, greatly reduces the amount of water entering the well due to the existence of its internal gas phase, thereby greatly reducing the formation damage caused by conventional water-based fracturing...

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