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

Chelation site-containing polyacrylamide, chelation type variable-viscosity slick water and preparation method of chelation site-containing polyacrylamide and chelation type variable-viscosity slick water

A polyacrylamide, chelating type technology, applied in the field of oil and gas field development, can solve the problems of easy shear damage, poor economy, high temperature resistance, etc., to prevent shear damage, good shear resistance, high viscosity increasing efficiency Effect

Active Publication Date: 2022-04-26
CHINA UNIV OF PETROLEUM (BEIJING)
View PDF10 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the method of using high-concentration polyacrylamide to increase the viscosity will lead to a substantial increase in the cost of fracturing fluid; the solubility of hydrophobically associated polyacrylamide is poor, it is difficult to prepare liquid, and the cost of hydrophobic monomer is high; ultra-high molecular weight polyacrylamide Acrylamide is very easy to shear damage, and the shear viscosity decreases significantly with time; while the method of anion and cation assembly, the cost of surfactant and polymer are high, the formation adsorption is serious, and the economy is poor; and the existing variable Sticky technology cannot withstand high temperature

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
  • Chelation site-containing polyacrylamide, chelation type variable-viscosity slick water and preparation method of chelation site-containing polyacrylamide and chelation type variable-viscosity slick water
  • Chelation site-containing polyacrylamide, chelation type variable-viscosity slick water and preparation method of chelation site-containing polyacrylamide and chelation type variable-viscosity slick water
  • Chelation site-containing polyacrylamide, chelation type variable-viscosity slick water and preparation method of chelation site-containing polyacrylamide and chelation type variable-viscosity slick water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] This example prepares a polyacrylamide solution H1 with carboxyl groups

[0044]

[0045]In 250mL four ports, adding molecular weight is 3,000,000 polyacrylic acid copolymer aqueous solution (Kemax Oil and Gas Field Technology Co., Ltd.), install mechanical stirring, reflux condenser, thermometer and constant pressure dropping funnel, add excess concentration and be 10% glycine aqueous solution ( The molar ratio of polyacrylic acid to amino acid is 1:500) Stir and mix evenly, add 5-methoxy-2-iodophenylboronic acid of 1% of the total molar weight of the monomers, adjust the temperature to 60°C, and keep stirring for 8h, that is The polyacrylamide solution H1 with carboxyl groups was obtained without further purification, and the reaction vessel remained unchanged, which was directly used for the next reaction.

Embodiment 2

[0047] This example prepares a polyacrylamide CPMA1 containing 0.5% chelating sites

[0048]

[0049] Slowly add iminodiacetic acid into the reaction system in Example 1, so that the molar ratio of carboxyl polyacrylamide and iminodiacetic acid is 1:0.006, the effective content of the polymer is 34%, and the temperature is maintained at 60°C Constant temperature and uniform stirring until the reaction 8h, which contains 0.5% chelate site polyacrylamide CPMA1.

[0050] The reaction process is as follows:

[0051]

Embodiment 3

[0053] This example prepares a chelating type viscous slippery water system CHVSW1

[0054] The sample obtained in Example 2 was dissolved in a 2% mass fraction of ammonium chloride brine under stirring, the mass concentration of the polymer CPMA1 was 0.5%, the stirring time was 2 hours, and the stirring speed was 600 rpm / min. After standing and aging for 2 hours, it was diluted to a polymer concentration of 0.1% by mass concentration, and its initial viscosity was 2.4 mPa·s. Add FeCl 3 The concentration of the aqueous solution is 12mg / L, and the system becomes viscous rapidly, and a chelating type viscous slippery water system CHVSW1 is obtained. Tested by Haake rheometer at 85°C, 170S -1 The viscosity at the shear frequency is 31.2mPa·s, and the test data is shown as 2# in Table 1, which proves that it can be used as an excellent viscous slippery water.

[0055] Table 1: Viscosity Test Data

[0056] serial number temperature shear frequency viscosity ...

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
Viscosityaaaaaaaaaa
Viscosityaaaaaaaaaa
Login to View More

Abstract

The invention discloses polyacrylamide containing chelating sites, chelating type variable-viscosity slick water and preparation of the chelating type variable-viscosity slick water. A reversible chelation cross-linked tackifying slickwater system with a main chain connected with chelation sites is synthesized, polyacrylic acid and amino acid are subjected to amidation under the catalytic action of boric acid to synthesize polyacrylamide with carboxyl groups, then organic amine containing chelation groups is added into the reaction system for amination reaction, and the tackifying slickwater system with the main chain connected with chelation sites is obtained. The polyacrylamide containing the chelation sites is obtained. A high-valence metal soluble salt is added into a 0.05%-2% aqueous solution of polyacrylamide, reversible crosslinking occurs, tackifying slick water with the viscosity of 1-1000 mPa.s is formed, and the tackifying slick water can be broken to 5 mPa.s or below by EDTA (Ethylene Diamine Tetraacetic Acid). According to the technology, the defects of low viscosity and weak sand-carrying capacity of conventional slick water are effectively overcome, and continuous online blending and high-proportion sand fracturing operation of the slick water can be realized.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to a polyacrylamide containing chelating sites, chelating type viscous slippery water and its preparation. Background technique [0002] The main function of fracturing fluid is to break rock formations to form fractures and carry proppant to complete sanding. Traditional fracturing fluids are mainly cross-linked guar gum. Slippery water fracturing fluid is a high-drag reduction and low-viscosity fracturing fluid system developed for the stimulation of tight reservoirs in recent years. The main components of the system are water, a small amount of drag reducer, clay stabilizer and surfactant agent. Compared with conventional jelly fracturing, its main advantage is that it has low frictional resistance, is easy to produce complex fracture pores, and can realize large fracturing stimulation, and has achieved good economic benefits. However, the viscosity of sli...

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
IPC IPC(8): C08F20/06C08F8/32C09K8/68C09K8/88
CPCC08F8/32C09K8/685C09K8/882C09K8/887C09K2208/28C08F20/06
Inventor 姚二冬周福建左洁杨凯王达李秀辉李源盛连奇
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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