A controllable viscoelastic supramolecular clean fracturing fluid system and its preparation method

A clean fracturing fluid and clean fracturing technology, applied in chemical instruments and methods, mining fluids, earth drilling and mining, etc., can solve problems such as poor temperature resistance and complex synthesis process, so as to avoid adsorption damage and improve synthesis process Simple, temperature-resistant thickening performance improvement effect

Active Publication Date: 2019-04-12
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Chinese patent CN201510089194.1 discloses a supramolecular clean fracturing fluid and its preparation method and application, but its synthesis process is complicated and its temperature resistance is not good

Method used

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  • A controllable viscoelastic supramolecular clean fracturing fluid system and its preparation method
  • A controllable viscoelastic supramolecular clean fracturing fluid system and its preparation method
  • A controllable viscoelastic supramolecular clean fracturing fluid system and its preparation method

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preparation example Construction

[0032] An adjustable supramolecular cleaning fracturing fluid system and a preparation method thereof, comprising the following components:

[0033] In terms of mass percentage: 1.0-6.0% cationic surfactant, 0.2-1.0% organic polybasic acid, 0.1-2.0% inorganic salt, 0.1-1.0% amphiphilic polymer, 98.6-90.0% water.

[0034] The cationic surfactant is an ultra-long chain fatty amide cationic surfactant with the following structure:

[0035]

[0036] Where: R is a saturated and unsaturated alkyl chain with carbon number C≥16

[0037] The preparation method of ultra-long-chain fatty amide cationic surfactant is as follows:

[0038] Put 5.0-50.0g of fatty tertiary amide and 2.5-25.0g of potassium carbonate into a single-mouth bottle, add 20.0-100.0mL of absolute ethanol to dissolve, raise the temperature to 50-70°C, slowly add 2.0-15.0g of bromopropene dropwise, drop After the addition was completed, the reaction was carried out for 7 to 24 hours, and the solid product was obtai...

Embodiment 1

[0046] The preparation method of erucamide propyl allyl ammonium bromide:

[0047] Take 26.0 g of erucamidopropyl dimethyl tertiary amine in a single-necked bottle, add 40 mL of absolute ethanol as a solvent, raise the temperature to 60 ° C, slowly add 8.0 g of bromopropene dropwise, continue the reaction for 12 hours, and distill under reduced pressure to obtain a yellow viscous Liquid, add acetone to dissolve, then refrigerate at 0°C for 10h to precipitate a white solid, filter, and dry to obtain the final product with a yield of 85-92%.

Embodiment 2

[0049]Prepare sodium chloride mineralized water with a salinity of 5000mg / L, stir it for 15 minutes to dissolve it completely; add 0.1wt% amphiphilic polymer to the configured mineralized water (the amphiphilic polymer is patented CN201710086348.0 The amphiphilic polymer product prepared in Example 1), stirred for 200 minutes, mixed uniformly, then added 0.5wt% citric acid, stirred for 10 minutes, mixed uniformly to obtain a mixed solution, and then added 2.0wt% of Example 1 The prepared erucamide propyl allyl ammonium bromide was stirred for 20 minutes and mixed uniformly to obtain a supramolecular clean fracturing fluid; the clean fracturing fluid was placed in the rheometer drum, at pH=6.2, 90°C, 170s -1 Under shearing for 120 minutes, the viscosity is kept stable at 50-55mPa·s, the breaking time of kerosene is 40 minutes, and the apparent viscosity of the breaking liquid is 4mPa·s. At pH=9.4, 90°C, 170s -1 Under shearing for 120 minutes, the viscosity is maintained at 65...

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Abstract

The invention provides an adjustable viscoelastic supramolecular clean fracturing fluid system and a preparation method thereof. The clean fracturing fluid system is composed of the following components in mass percentage: 1.0-6.0% cationic surfactant; 0.2-6.0% organic acid 1.0%; Inorganic salt 0.1-2.0%; Amphiphilic polymer 0.1%-1.0%; Water 98.6-90.0%. When preparing, first prepare super long-chain fatty amide cationic surfactant, dissolve inorganic salt in water, and then Then add amphiphilic polymer, organic acid and cationic surfactant in sequence, and after fully stirring, a supramolecular cleaning fracturing fluid can be obtained; this supramolecular cleaning fracturing fluid has the property of adjustable viscosity, through Join to achieve different performance requirements. At the same time, it can effectively fracture the formation, with simple configuration, small dosing amount, strong sand-carrying property, and good temperature resistance, which avoids the problems of large dosing amount and poor temperature resistance in the existing conventional clean fracturing fluid system, and improves the pressure. Improve fracturing efficiency, reduce fracturing costs, and expand applicable formation conditions.

Description

technical field [0001] The invention relates to the technical field of acidizing fracturing agents, in particular to an adjustable supramolecular cleaning fracturing fluid system and a preparation method thereof. Background technique [0002] With the extension of exploration and development time in my country's oilfields, the production of conventional oil and gas continues to decline. Low-permeability and ultra-low-permeability oil and gas resources have become new hot spots in oil and gas development. In the situation of low energy and difficult energy replenishment, large-scale fracturing must be carried out to form industrial production capacity and realize efficient development. Clean fracturing fluid has been widely used in medium and low temperature formations due to its simple molecular structure, good solubility, less damage to the formation, and good gel-breaking performance. There is a problem that the amount of surfactant is large and the cost of use is high. Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68C09K8/584C09K8/88E21B43/26
CPCC09K8/584C09K8/665C09K8/68C09K8/882E21B43/26
Inventor 杨红斌康万利王鹏祥赵一潞邵硕侯小雨陈超朱洲张向峰
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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