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

A technology for cleaning foams and thickeners, applied in chemical instruments and methods, and drilling compositions, etc., can solve the problems of non-negligible compatibility of saturated aqueous solutions, poor temperature resistance of thickeners, and high cost, and achieve high pressure Crack construction effect, strong temperature and shear resistance, and strong foam stability

Active Publication Date: 2017-02-22
四川奥赛德材料科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advent of this thickener quickly attracted the attention of oil fields at home and abroad, and set off an upsurge in the research and application of surfactant thickeners. However, there are still several major problems in this thickener: 1. Thickener resistance The temperature capacity is poor, and the due use effect cannot be exerted in the high-temperature well section; 2. The amount of thickener used is large and the cost is too high, and the cost per cubic meter generally exceeds 2,000 RMB; 3. The gel breaking is passive and needs to be destroyed by oil and gas The dilution with formation water can passively break the gel
[0006] In view of the advantages a

Method used

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

Examples

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Example Embodiment

[0056] Example 1,

[0057] The preparation scheme 1 of a thickening agent for cleaning foam fracturing fluid provided by the present invention is as follows:

[0058] (1) Pretreatment of reactants

[0059] In the feeding tank, add benzoyl peroxide to the deionized water in a ratio of 2% of the total amount of deionized water, dissolve completely and stir evenly to prepare an aqueous initiator solution (made and used now).

[0060] Add deionized water to the high-temperature and high-pressure reactor, and mix acrylamide, N,N'-methylenebisacrylamide, N-vinylpyrrolidone, octadecyldimethylallylammonium chloride, NH4Cl, ethyl Add the amide to the reaction kettle to dissolve it in deionized water, and introduce nitrogen from the bottom of the kettle, control the gas flow to make the solution surface tumble, and when the solids in the solution are completely dissolved and mixed uniformly, the solution is added from the feeding port on the top of the reaction kettle Join Na 2 CO 3 Adjust the...

Example Embodiment

[0069] Example 2,

[0070] The preparation scheme 2 of a thickening agent for cleaning foam fracturing fluid provided by the present invention is as follows:

[0071] (1) Pretreatment of reactants

[0072] In the feeding tank, add the benzoyl peroxide / N,N-diethylaniline (mass ratio 2:3) redox system to the deionized water, the proportion of which is 2% of the total deionized water consumption, dissolve Complete and stir evenly to prepare an initiator aqueous solution (made for now).

[0073] Add deionized water to the high-temperature and high-pressure reactor, and mix acrylamide, N,N'-methylenebisacrylamide, N-vinylpyrrolidone, dimethyldiallylammonium chloride, NaCl, sodium salicylate Add the reaction kettle to dissolve it in deionized water, and introduce nitrogen from the bottom of the kettle, control the gas flow to make the solution surface tumble, when the solids in the solution are completely dissolved and mixed uniformly, add to the solution from the feeding port on the top o...

Example Embodiment

[0082] Example 3.

[0083] The optimized preparation scheme of a thickening agent for clean foam fracturing fluid provided by the present invention is as follows:

[0084] (1) Pretreatment of reactants

[0085] In the feeding tank, add the sodium perborate / sodium bisulfite (mass ratio 2:3) redox system to the deionized water, the ratio of which is 2% of the total deionized water consumption, dissolve completely and stir evenly. Get the initiator aqueous solution (now made and used).

[0086] Add deionized water to the high-temperature and high-pressure reactor, mix acrylamide, N,N'-methylenebisacrylamide, N-vinylpyrrolidone, cetyldimethylallylammonium chloride, KCl, urea Add the reaction kettle to dissolve it in deionized water, and introduce nitrogen from the bottom of the kettle, control the gas flow to make the solution surface tumble, when the solids in the solution are completely dissolved and mixed uniformly, add to the solution from the feeding port on the top of the reaction ...

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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...

Claims

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Application Information

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IPC IPC(8): C09K8/68C09K8/70C08F220/56C08F222/38C08F226/10C08F226/02
CPCC08F220/56C09K8/68C09K8/703C08F222/385C08F226/10C08F226/02
Inventor 刘通义林波陈光杰谭坤戴秀兰魏俊
Owner 四川奥赛德材料科技有限公司
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