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High temperature resistant seawater based fracturing fluid thickener and preparation method thereof

A technology of high temperature resistance and thickening agent, which is applied in the field of fracturing and production stimulation. It can solve the problems of good viscosity increase and no mention of temperature resistance, and achieve the effects of good sand carrying, saving manpower and material costs, and low damage

Inactive Publication Date: 2018-09-04
CNOOC TIANJIN BRANCH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] CN105331352A discloses a seawater-based fracturing fluid and a method for preparing the seawater-based fracturing fluid. In the seawater-based fracturing fluid of the invention, the components included in 100 parts of the fracturing fluid and the weight ratio of the components are: : 0.3-0.8 part of thickener, 0.1-0.6 part of cross-linking agent, 0.05-0.1 part of oxygen scavenger, 0.02-0.05 part of viscosifying aid and 0.05-0.2 part of gel breaker, and all or part of the rest is seawater; The thickener is specifically modified polyacrylamide; wherein, the modified polyacrylamide is formed by copolymerization of acrylamide, hydrophobically modified monomer and sulfonate, and the hydrophobically modified monomer is dodecyl haloalkane, Using organic zirconium cross-linking agent or organic titanium-zirconium composite cross-linking agent, the fracturing fluid is suitable for offshore oil fields, has good viscosity increasing, strong salt resistance and shear resistance, and can be continuously mixed, but does not mention temperature resistance performance

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  • High temperature resistant seawater based fracturing fluid thickener and preparation method thereof
  • High temperature resistant seawater based fracturing fluid thickener and preparation method thereof
  • High temperature resistant seawater based fracturing fluid thickener and preparation method thereof

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Embodiment 1

[0077] The preparation method of the high-temperature-resistant seawater-based fracturing fluid thickener of the present embodiment is as follows:

[0078] 1) Synthesis of monododecyl maleate sodium salt:

[0079] Keep the temperature in the reactor at 10°C, add 103.6g of toluene solvent, 26g of maleic anhydride and stir until dissolved, add 60g of dodecyl alcohol and 0.4g of sodium p-toluenesulfonate and stir until dissolved; close the reactor and heat up to 60°C After reacting for 12 hours, 10 g of sodium hydroxide was used for neutralization reaction for 3 hours, cooled to room temperature and then filtered. The obtained white solid was monododecyl maleate sodium salt, which was set aside.

[0080] 2) Synthesis of N-hexadecyl acrylamide:

[0081]Keep the temperature in the reactor at 20°C, add 99g of toluene solvent, 76g of hexadecylamine and stir until dissolved, add 24g of acrylic acid and 1g of sodium p-toluenesulfonate and stir until dissolved; heat up to 85°C after se...

Embodiment 2

[0087] The preparation method of the high-temperature-resistant seawater-based fracturing fluid thickener of the present embodiment is as follows:

[0088] 1) Synthesis of monododecyl maleate sodium salt:

[0089] Keep the temperature in the reactor at 30°C, add 168.3g of toluene solvent, 36g of maleic anhydride and stir until dissolved, add 78g of dodecanol and 1.2g of sodium p-toluenesulfonate and stir until dissolved; close the reactor and heat up to 80°C After reacting for 8 hours, 16.5 g of sodium hydroxide was used for neutralization reaction for 2 hours, cooled to room temperature and then filtered. The obtained white solid was monododecyl maleate sodium salt, which was set aside.

[0090] 2) Synthesis of N-hexadecyl acrylamide:

[0091] Keep the temperature in the reactor at 30°C, add 146.1g of toluene solvent, 120g of hexadecylamine and stir until dissolved, add 33g of acrylic acid and 0.9g of sodium p-toluenesulfonate and stir until dissolved; close the reactor and ...

Embodiment 3

[0097] The preparation method of the high-temperature-resistant seawater-based fracturing fluid thickener of the present embodiment is as follows:

[0098] 1) Synthesis of monododecyl maleate sodium salt:

[0099] Keep the temperature in the reactor at 20°C, add 257.5g of toluene solvent, 70g of maleic anhydride and stir until dissolved, add 140g of dodecyl alcohol and 2.5g of sodium p-toluenesulfonate and stir until dissolved; close the reactor and heat up to 70°C After reacting for 10 hours, 30 g of sodium hydroxide was used for neutralization reaction for 4 hours, cooled to room temperature and then filtered. The white solid obtained was maleic acid monododecyl ester sodium salt, which was set aside.

[0100] 2) Synthesis of N-hexadecyl acrylamide:

[0101] Keep the temperature in the reactor at 10°C, add 239.5g of toluene solvent, 210g of hexadecylamine and stir until dissolved, add 50g of acrylic acid and 0.5g of sodium p-toluenesulfonate and stir until dissolved; close ...

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Abstract

The invention discloses a high temperature resistant seawater based fracturing fluid thickener and a preparation method of the high temperature resistant seawater based fracturing fluid thickener. Thepreparation method of the high temperature resistant seawater based fracturing fluid thickener comprise the following preparation raw material components in percentage by mass: 2-3% of maleic acid sodium monododecyl ester, 2-3% of N-hexadecyl acrylamide, 15-20% of acrylamide, 6-8% of sodium acrylate, 3-5% of 2-acrylamide-2-sodium methallyl sulfonate, 2-3% of N-vinyl pyrrolidone, 0.1-0.5% of a redox system initiator, and 58-70% of deionized water. The process of the preparation method is simple and convenient, and by reasonably regulating the raw materials, the ratios and the reaction conditions, the prepared high temperature resistant seawater based fracturing fluid thickener has the characteristics that: the high temperature resistant seawater based fracturing fluid thickener is instantly soluble in seawater, the high temperature resistance and the shearing resistance are excellent, and the high temperature resistant seawater based fracturing fluid thickener is clean and environmentally friendly, causes low damage, and is high in sand carrying property and adaptability.

Description

technical field [0001] The invention relates to the technical field of fracturing stimulation, in particular to a fracturing fluid thickener and a preparation method thereof, in particular to a high-temperature-resistant seawater-based fracturing fluid thickener and a preparation method thereof. Background technique [0002] In recent years, with the strategic in-depth development of oil and gas resources development, one of the important trends is the ocean. Offshore oil and gas resources are extremely rich, but offshore low-permeability oil and gas fields are less well developed. People are paying more and more attention to developing offshore low-permeability oil and gas fields and increasing oil and gas production. At present, offshore low-permeability oil and gas fields are mainly sandstone reservoirs, which are characterized by deep geological burial, high temperature, high shale content, and low rock porosity, making development difficult. [0003] At present, large-...

Claims

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Application Information

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IPC IPC(8): C09K8/68C07C67/08C07C69/60C07C231/02C07C233/09C08F220/56C08F220/54C08F220/06C08F220/58C08F226/10C08F222/16
CPCC07C67/08C07C231/02C08F220/56C09K8/68C09K8/882C07C69/60C07C233/09C08F220/54C08F220/06C08F220/585C08F226/10C08F222/165
Inventor 王杏尊鲍文辉李三喜郭布民陈磊孙厚台李梦申金伟赵健
Owner CNOOC TIANJIN BRANCH
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