Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Viscoelastic surfactant weighted fracture fluid, and preparation method thereof

A surfactant and viscoelastic technology, applied in the field of viscoelastic surfactant aggravating fracturing fluid and its configuration, can solve problems such as easily broken gelled water, and achieve the effect of strong temperature resistance, shear resistance and density increase.

Active Publication Date: 2018-06-01
CHINA UNIV OF PETROLEUM (EAST CHINA)
View PDF4 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ordinary viscoelastic surfactant fracturing fluid is also easy to break gel when encountering high salinity formation water, so it is not suitable to use high-concentration brine to aggravate. The usual viscoelastic surfactant fracturing fluid has a density of 0.98-1.05 g / cm 3

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Viscoelastic surfactant weighted fracture fluid, and preparation method thereof
  • Viscoelastic surfactant weighted fracture fluid, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Preparation of Viscoelastic Surfactants in Isopropanol

[0026] Add 211g (0.5mol) of erucamidopropyldimethyl tertiary amine and 148g of isopropanol into a 500ml reactor with a stirring and cooling device, heat to 60°C, and slowly add 86g (0.5mol) of methyl benzenesulfonate dropwise. ), ensure that the reaction temperature is no more than 70 DEG C, and continue to react for 2 hours after dropping, to obtain the isopropanol solution of the erucamide propyltrimethylbenzenesulfonic acid quaternary ammonium salt of the viscoelastic surfactant.

Embodiment 2

[0028] Preparation of Viscoelastic Surfactants in Isopropanol

[0029] Add 366g (1mol) of oleic acid amidopropyl dimethyl tertiary amine and 269g of isopropanol into a 1L reaction kettle with a stirring and cooling device, heat to 60°C, slowly add 172g (1mol) of methyl benzenesulfonate dropwise, Ensure that the reaction temperature does not exceed 70° C., and continue to react for 2 hours after the drop is completed to obtain an isopropanol solution of oleic acid amidopropyltrimethylbenzenesulfonic acid quaternary ammonium salt of viscoelastic surfactant.

Embodiment 3

[0031] Weighted fracturing fluid configuration

[0032] A component: the isopropanol solution 1g, 20gCaCl 2 , 0.2g industrial hydrochloric acid, and 76.8g water were mixed evenly, and the initial viscosity was 32mPa·s.

[0033] Component B: 2 g of isopropanol solution of oleic amidopropyltrimethylbenzenesulfonic acid quaternary ammonium salt obtained in Example 2.

[0034] A component is mixed with B component to obtain a weighted fracturing fluid with an initial viscosity of 370mPa·s and a density of 1.157g / cm 3 . At 110°C, shear rate 170s -1 Keep it for 2 hours, and the minimum viscosity is 63mPa·s, meeting the requirement of not less than 50mPa·s for fracturing construction.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
densityaaaaaaaaaa
densityaaaaaaaaaa
viscosityaaaaaaaaaa
Login to View More

Abstract

The invention provides a viscoelastic surfactant weighted fracture fluid, and a preparation method thereof. The viscoelastic surfactant weighted fracture fluid is composed of, by mass, 2 to 5% of an isopropanol solution of a viscoelastic surfactant, 20 to 40% of a weighting agent, 0.1 to 1% of hydrochloric acid, and the balance water. The preparation method comprises following steps: an A component taking as a base solution and a B component taken as a cross-linking agent are prepared respectively, wherein the A component is composed of, by mass, 1% of the isopropanol solution of the viscoelastic surfactant, 20 to 40% of the weighting agent, 0.1 to 1% of hydrochloric acid, and the balance water, and the B component is composed of 1 to 4% of the isopropanol solution of the viscoelastic surfactant; and the A component and the B component are mixed so as to obtain a finished product. The density of the viscoelastic surfactant weighted fracture fluid ranges from 1.15 to 1.42g / cm<3>, the density is increased greatly, and fracture fluid on-site construction requirements are satisfied. The viscoelastic surfactant weighted fracture fluid is convenient to prepare, possesses instant performance, is capable of realizing construction field rapid preparation, possesses excellent temperature resistance and shearing resistance, and is capable of realizing automatic gel breaking in encounter with oil gas in stratum.

Description

technical field [0001] The invention belongs to the technical field of fracturing for improving reservoirs in the oil exploitation industry, and in particular relates to a viscoelastic surfactant-weighted fracturing fluid and a configuration method thereof. Background technique [0002] With the continuous advancement of exploration technology, the number of deep wells, ultra-deep wells and high-pressure wells in major oil fields has gradually increased, and more and more deep wells exceeding 3000m. For deep high-temperature reservoirs, due to the large buried depth and high fracture pressure, the fracturing operation usually reaches above 90MPa, or even exceeds 100MPa. During fracturing, the wellhead construction pressure is high, which may exceed the pressure upper limit of the existing equipment. In order to reduce the construction pressure, Fracturing fluid aggravation measures can be used to increase the formation pressure by relying on the vertical pressure of the flui...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C09K8/66C09K8/86C09K8/584
CPCC09K8/584C09K8/665C09K8/68C09K8/86C09K2208/30
Inventor 吴伟刘江辉赵婷婷杨雪儿叶帆张晓云
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com