Instant recoverable slippery water for shale gas reservoir

A technology for shale gas reservoirs and slick water, which is applied to drilling compositions, chemical instruments and methods, etc., can solve the problems of high flowback fluid treatment cost, difficulty in meeting shale, long swelling time, etc. Liquid handling costs, wide application, reduced damage effects

Active Publication Date: 2012-06-27
PETROCHINA CO LTD
View PDF2 Cites 48 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current slick water has the following disadvantages: ①The swelling time of the current slick water is relatively long, especially for drag reducers with high molecular weight, the swelling time is 10-20 minutes, which is difficult to mee

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Take 492.4ml of water and place it in a mixer with a capacity of 1000ml, add 1% potassium chloride successively, stir for 1min to dissolve, then slowly add 0.2% drag reducing agent, stir for 10s, then add 0.2% drainage aid, and finally add 0.2% % Clay anti-swelling agent cationic polyquaternary ammonium salt, stirred for 20s and mixed evenly to make slick water, the measured kinematic viscosity of slick water was 3mpa.s, and the resistance reduction rate of slick water was 60%. It is 3mpa.s, and the resistance reduction rate of flowback liquid is 60%.

Embodiment 2

[0019] Take 487.3ml of water and place it in a mixer with a volume of 1000ml, add 1.5% g of potassium chloride successively, stir for 1min to dissolve, then slowly add 0.2% drag reducing agent, stir for 10s, then add 0.3% drainage aid, and finally add 0.5% clay anti-swelling agent cationic polyquaternary ammonium salt, stirred evenly for 20s, made slick water, the measured kinematic viscosity of slick water was 3.0mpa.s, and the drag reduction rate of slick water was 63%. The viscosity is 3.0mpa.s, and the resistance reduction rate of flowback liquid is 63%.

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
Kinematic viscosityaaaaaaaaaa
Login to view more

Abstract

The invention relates to instant recoverable slippery water for a shale gas reservoir. The slippery water consists of the following components in percentage by weight: 0.02-0.1 percent of a friction-reducing agent, 0.2-2.0 percent of potassium chloride, 0.1-0.5 percent of a cleanup additive, 0.1-0.5 percent of an anti-swelling agent and the balance of water, wherein the friction-reducing agent is polyacrylamide or a polyacrylamide derivative of which the molecular weight is 5*105-1*106; the cleanup additive consists of 0.5-2.0 percent by mass of a fluorocarbon surfactant, 10-15.0 percent by mass of a low molecular alcohol solvent, 3.0-5.0 percent by mass of a high molecular alcohol additive, 10.0-20.0 percent by mass of a technical grade hydrocarbon chain surfactant and the balance of water; and the anti-swelling agent is a cation polyquaternary salt, poly-quaternary phosphate or a poly-quaternary sulfate. The slippery water can be fully dissolved and swelled within 20-30 seconds for forming a uniform system without oxidizing a gel breaker, damage to the crack diversion capability can be reduced, a cracking reverse discharge liquid can be recycled, and waste liquid treatment cost is lowered.

Description

technical field [0001] The invention relates to a recyclable fracturing fluid used in fracturing and stimulation of shale natural gas wells, in particular to a recyclable slick water using polyacrylamide or polyacrylamide derivatives as a drag reducing agent. Background technique [0002] Fracturing stimulation is required in the development of low-permeability reservoirs. Commonly used fracturing fluids use natural or synthetic polymers as thickeners, and water or brine as solvents. In order to facilitate the carrying and fracturing of proppants, the viscosity is high. However, for ultra-low permeability reservoirs, such as shale, the use of common fracturing fluids for fracturing stimulation is not only costly but also harmful. Therefore, slick water fracturing fluid is usually used for stimulation in the development of shale reservoirs. However, the current slick water has the following disadvantages: ①The swelling time of the current slick water is relatively long, espe...

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): C09K8/68
Inventor 刘友权陈鹏飞刘爽王小红王川张永国石晓松
Owner PETROCHINA CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap