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

Three-dimensional crimped PVA (polyvinyl acetate) fiber as well as preparation method and application thereof

A three-dimensional crimping and fiber technology, applied in the direction of fiber processing, fiber chemical characteristics, chemical instruments and methods, etc., to achieve the effects of improving stability, reducing damage, and improving the ability of temporary plugging and cementing

Inactive Publication Date: 2017-10-20
CHINA PETROCHEMICAL CORP +1
View PDF7 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although domestic and foreign counterparts have made a lot of efforts, so far, the existing fracturing technology still cannot achieve the purpose of reducing the damage of fracturing fluid to the reservoir and improving the sand-carrying performance.

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
  • Three-dimensional crimped PVA (polyvinyl acetate) fiber as well as preparation method and application thereof
  • Three-dimensional crimped PVA (polyvinyl acetate) fiber as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Preparation of spinning dope: PVA with a degree of polymerization of 2000 and a degree of alcoholysis of 98.5 (mol)% is dissolved in water while stirring to form a spinning dope. The mass concentration of PVA in the dope is 16%. The stock solution is heated to 95°C, maintained at a pressure of 0.08MPa, and dissolved for 8 hours before entering the spinning process.

[0041] (2) Spinning: The PVA stock solution is sent to the spinning assembly by a metering pump, the PVA stock solution is spun through the spinneret, and the filaments enter the coagulation bath to form. The components of the coagulation bath are sodium sulfate, zinc sulfate, ammonium sulfate and sulfuric acid. The concentration of sodium sulfate in the coagulation bath is 370g / l, the concentration of zinc sulfate in the coagulation bath is 30g / l, and the concentration of ammonium sulfate in the coagulation bath It is 150g / l. After sulfuric acid is added, the pH of the coagulation bath is adjusted to 3.5,...

Embodiment 2

[0045] Use the following steps to prepare PVA fiber:

[0046] (1) Preparation of spinning dope: PVA with a degree of polymerization of 1500 and a degree of alcoholysis of 99 (mol)% is dissolved in water while stirring to form a spinning dope. The mass concentration of PVA in the dope is 15%. The stock solution is heated to 95°C, maintained at a pressure of 0.05 MPa, and dissolved for 10 hours before entering the spinning process.

[0047] (2) Spinning: The PVA stock solution is sent to the spinning assembly by a metering pump, the PVA stock solution is spun through the spinneret, and the filaments enter the coagulation bath to form. The components of the coagulation bath are sodium sulfate, zinc sulfate, ammonium sulfate and sulfuric acid. The concentration of sodium sulfate in the coagulation bath is 385g / l, the concentration of zinc sulfate in the coagulation bath is 20g / l, and the concentration of ammonium sulfate in the coagulation bath After sulfuric acid was added, the pH of...

Embodiment 3

[0051] Use the following steps to prepare PVA fiber:

[0052] (1) Preparation of spinning dope: PVA with a degree of polymerization of 3000 and a degree of alcoholysis of 95 (mol)% is dissolved in water while stirring to form a spinning dope. The mass concentration of PVA in the dope is 15%. The stock solution was heated to 95°C, maintained at a pressure of 0.10 MPa, and dissolved for 15 hours before entering the spinning process.

[0053] (2) Spinning: The PVA stock solution is sent to the spinning assembly by a metering pump, the PVA stock solution is spun through the spinneret, and the filaments enter the coagulation bath to form. The components of the coagulation bath are sodium sulfate, zinc sulfate, ammonium sulfate and sulfuric acid. The concentration of sodium sulfate in the coagulation bath is 390g / l, the concentration of zinc sulfate in the coagulation bath is 10g / l, and the concentration of ammonium sulfate in the coagulation bath It is 280g / l. After sulfuric acid is ad...

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
thicknessaaaaaaaaaa
tensile strengthaaaaaaaaaa
densityaaaaaaaaaa
Login to View More

Abstract

The invention provides a PVA (polyvinyl acetate) fiber. The PVA fiber is characterized by being prepared from polyvinyl alcohol with polymerization degree being 1000-2500 and alcoholysis degree being 94(mol)%-99.9 (mol)% through spinning. The PVA fiber is in a three-dimensional crimped shape in space, and the number of crimps is larger than or equal to 3 / 25 mm. The PVA fiber has a good sand carrying function when used in fracture construction of oil and gas fields and is also beneficial to flow back of a fracturing fluid; the PVA fiber can also be better combined with a proppant in a base fluid when used for temporary plugging and well cementing in oil and gas fields, and accordingly, temporary plugging and well cementing capacities of the PVA fiber are greatly improved, and production increase of the oil and gas fields is facilitated. A preparation method is simple and suitable for industrial production.

Description

Technical field [0001] The invention relates to a PVA (polyvinyl alcohol) fiber, in particular to a three-dimensional crimped PVA fiber and a preparation method and application thereof. Background technique [0002] my country's low-permeability oil and gas resources are huge, accounting for more than 70% of the total proven reserves, and they are the main potential work areas for my country's future reserves and production. This type of oil and gas resources have the characteristics of three lows, namely low proven rate, low natural production rate, and low recovery rate. Fracturing is an important technical measure to increase production in oil and gas fields and water injection wells. The performance of fracturing fluid is the key factor for the success or failure of fracturing. At present, the commonly used fracturing fluids at home and abroad are water-based fracturing fluids, among which water-based fracturing fluids using natural vegetable gum as a thickening agent are t...

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): D01F6/14D01F11/06C09K8/68C09K8/90C09K8/42D01D5/253D01D5/34D02G1/00
CPCD01F6/14C09K8/42C09K8/685C09K8/887C09K8/90C09K2208/08C09K2208/24C09K2208/26D01D5/253D01D5/34D01F11/06D02G1/004
Inventor 王华全冷平王建徐小松刘禅
Owner CHINA PETROCHEMICAL CORP
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