Composition, temperature-resistant salt-resistant fracturing fluid thickening agent prepared from composition, and preparation method thereof

A fracturing fluid thickener, temperature-resistant and salt-resistant technology, applied in the field of temperature-resistant and salt-resistant fracturing fluid thickener and its preparation, and preparation of temperature-resistant and salt-resistant fracturing fluid thickener composition field, can solve Few studies have been done to achieve the effects of complete gel breaking, improved salt resistance, and slow viscosity reduction

Active Publication Date: 2019-05-03
SHANDONG NUOER BIOLOGICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The currently used synthetic polymers mainly include polyacrylamide cross-linked jelly and hydrophobically associated polyacrylamide (HAPAM), and the latter has strong salt and shear resistance when used as a fracturing fluid thickener. The characteristics of complete gel breaking have attracted widespread attention, but there are few researches on products with high temperature resistance (>130°C) and high salt resistance.

Method used

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  • Composition, temperature-resistant salt-resistant fracturing fluid thickening agent prepared from composition, and preparation method thereof
  • Composition, temperature-resistant salt-resistant fracturing fluid thickening agent prepared from composition, and preparation method thereof
  • Composition, temperature-resistant salt-resistant fracturing fluid thickening agent prepared from composition, and preparation method thereof

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preparation example Construction

[0039] The present invention also provides a preparation method of a temperature-resistant and salt-resistant fracturing fluid thickener, the preparation method comprising the following steps:

[0040] (1) Mix the composition provided by the present invention and 507 to 700 parts by weight of the second solvent (for example, it can be 507, 600 or 700 parts by weight), and adjust the pH of the mixing system to 6.5 to 6.8 (for example, it can be 6.5, 6.6, 6.7 or 6.8), then add 0.01 to 0.025 parts by weight of a molecular weight regulator (for example, 0.01, 0.02 or 0.025 parts by weight) to the mixed system, pass nitrogen to remove oxygen, and then add the initiator system to the mixed system 0.001~0.5 parts by weight (for example, it can be 0.001, 0.01, 0.1, 0.2, 0.4 or 0.5 parts by weight) at 10~12°C (for example, it can be 10°C, 11°C or 12°C) to initiate the polymerization reaction, and the reaction ends Finally, the temperature-resistant and salt-resistant fracturing fluid t...

Embodiment 1

[0046] Prepare shielding agent

[0047] The preparation raw materials include: 130 parts by weight of acrylic acid, 13 parts by weight of maleic anhydride, 13 parts by weight of 2-acrylamide-2-methylpropanesulfonic acid, 8 parts by weight of sodium methacrylate, 85 parts by weight of sodium hydroxide, and 751 parts by weight of ionized water, 0.5 parts by weight of sodium formate, 0.08 parts by weight of ammonium persulfate, and 0.04 parts by weight of sodium bisulfite.

[0048] The preparation method comprises the following steps:

[0049] Add acrylic acid, maleic anhydride, 2-acrylamide-2-methylpropanesulfonic acid, sodium methacrylsulfonate and deionized water into the reactor, after fully dissolving, adjust the pH value of the solution with sodium hydroxide, and adjust the pH The value is adjusted between 7.0-7.2, and sodium formate is added at the same time;

[0050] Deoxygenate with nitrogen for 60 minutes, add ammonium persulfate and sodium bisulfite in turn, and poly...

Embodiment 2

[0054] The preparation raw materials include: 215 parts by weight of acrylamide, 45 parts by weight of acrylic acid, 8 parts by weight of N,N-di-n-octyl acrylamide, 20 parts by weight of 2-acrylamide-2-methylpropanesulfonic acid, p-styrenesulfonic acid 40 parts by weight of sodium, 1.5 parts by weight of sodium lauryl sulfate, 15 parts by weight of shielding agent, 29 parts by weight of sodium hydroxide, 626.5 parts by weight of deionized water, 0.12 parts by weight of sodium formate, azobisisobutylamidine dihydrochloride 0.15 parts by weight, 0.02 parts by weight of potassium persulfate and 0.015 parts by weight of sodium bisulfite.

[0055] The preparation method comprises the following steps:

[0056] Add acrylamide, acrylic acid, N,N-di-n-octyl acrylamide, 2-acrylamide-2-methylpropanesulfonic acid, sodium p-styrenesulfonate, sodium lauryl sulfate, After the shielding agent and deionized water are fully dissolved, adjust the pH value of the solution with sodium hydroxide t...

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Abstract

The invention relates to a composition used for preparing a temperature-resistant salt-resistant fracturing fluid thickening agent, the temperature-resistant salt-resistant fracturing fluid thickeningagent prepared from the composition, and a preparation method thereof. The composition comprises following components: acrylamide, acrylic acid, a hydrophobic monomer, 2-acrylamido-2-methylpropane sulfonic acid, a rigid monomer, a surfactant, and a shielding reagent. According to the temperature-resistant salt-resistant fracturing fluid thickening agent, excellent sand suspension effect can be achieved without crosslinking with a crosslinking agent, the temperature resistance and salt resistance are better; after 2h of aging in a simulated brine with total mineralization degree of 50000mg / L at 160 DEG C, the viscosity retention rate of the temperature-resistant salt-resistant fracturing fluid thickening agent is equal to or larger than 80%. Solution gel breaking of the temperature-resistant salt-resistant fracturing fluid thickening agent is complete, no water insoluble substance is left, flowback is complete, the ground is not destroyed, and no oil layer pollution is caused.

Description

technical field [0001] The invention relates to the technical field of oil field acidizing and fracturing, in particular to a composition for preparing a temperature-resistant and salt-resistant fracturing fluid thickener, a temperature-resistant and salt-resistant fracturing fluid thickener prepared by using the composition and its preparation method. Background technique [0002] The proportion of low-permeability oil and gas resources in my country is more than 50%, and low-permeability oil and gas resources have become the main exploration and development targets in China. Because low-permeability reservoirs are affected by factors such as large burial depth, high formation temperature (120°C-160°C), high salinity of formation water, strong diagenesis and compaction, etc., they usually have to undergo fracturing, acidizing, and acid fracturing. Effective development can only be achieved through measures to increase production. The high-temperature and salt-resistant fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C08F220/06C08F222/06C08F220/58C08F228/02C08F220/56C08F220/54C08F212/14
Inventor 荣敏杰孙建波许永升于庆华荣帅帅
Owner SHANDONG NUOER BIOLOGICAL TECH
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