Unlock instant, AI-driven research and patent intelligence for your innovation.

Macromolecular pulverized coal settling agent for coal bed gas well drainage and preparation method and application thereof

A technology for coalbed methane wells and settling agents, which is applied in the fields of production fluids, earth-moving drilling, wellbore/well components, etc., can solve the problems of unknown damage effect and requirements of flocculation speed, etc., and achieves low penetration damage rate, small application amount, good sedimentation effect

Active Publication Date: 2020-11-10
CHINA UNIV OF MINING & TECH (BEIJING)
View PDF6 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, in the drainage process, there is a requirement for the flocculation speed, and it is required to complete the effective settlement before reaching the pump; on the other hand, the destructive effect of the above-mentioned flocculants on the geological permeability of the coal seam is still unknown

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
  • Macromolecular pulverized coal settling agent for coal bed gas well drainage and preparation method and application thereof
  • Macromolecular pulverized coal settling agent for coal bed gas well drainage and preparation method and application thereof
  • Macromolecular pulverized coal settling agent for coal bed gas well drainage and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0041] (S1) Preparation of hydrooximated acrylamide: 15 parts of acrylamide and 10 parts of hydroxylamine sulfate are dissolved in 100 parts of water, and the resulting aqueous solution is stirred under a nitrogen atmosphere at a stirring speed of 400 r / min for 30 minutes to fully remove oxygen. Adjust the pH to 11 with NaOH solution, react at 80°C for 5 hours, and then adjust the pH to 7 with dilute sulfuric acid to obtain hydroxamated acrylamide;

[0042] (S2) Feed according to the molar ratio of hydroxamated acrylamide, acrylic acid, dimethyl allyl phosphate, sorbitol acrylate, and N,N-methylenebisacrylamide in a molar ratio of 50:40:15:7:1, and stir , under an inert atmosphere, add 2 times the water of the total monomer mass, 1.2 times the 200# solvent oil of the total monomer mass, and 2% emulsifier of the total monomer mass (Tween 60 and OP-20 according to the ratio of mass 3:1 Compounding), stirring and emulsifying to form a microemulsion, adding an initiator of 0.7wt% ...

preparation example 2

[0045] The other steps and conditions are the same as in Preparation Example 1, except that the molar ratio of hydroximated acrylamide, acrylic acid, dimethyl allyl phosphate, sorbitol acrylate, and N,N-methylenebisacrylamide is 50:40:10 :5:1.5 Feeding. The viscosity-average molecular weight of the prepared sedimentation agent is 3.257×10 6 g / mol.

preparation example 3

[0047] Other steps and conditions are the same as in Preparation Example 1, the difference is that the molar ratio of hydroxime acrylamide, acrylic acid, dimethyl allyl phosphate, sorbitol acrylate, and N,N-methylenebisacrylamide is 50:40:15 :7:2 Feeding. The viscosity-average molecular weight of the prepared sedimentation agent is 4.162×10 6 g / mol.

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

No PUM Login to View More

Abstract

The invention provides a macromolecular pulverized coal settling agent for coal bed gas well drainage, which comprises repeating units shown as a formula (A), a formula (B), a formula (C), a formula (D) and a formula (E), in the formulas, R1 is selected from H or C1-C4 alkyl, R2 and R3 are independently selected from C1-C4 alkyl, and M is sodium or potassium. A settling agent provided by the invention has rich functional groups including carboxylate anions, hydroxamic acid groups, polyhydroxy groups, amino groups and phosphate groups, and the various functional groups play a synergistic role and interact with the surfaces of pulverized coal particles, so that the pulverized coal with various particle sizes can be quickly settled. The settling agent is prepared by adopting a reversed-phasemicroemulsion method, the settling agent with larger molecular weight is obtained, pulverized coal can be quickly and effectively settled, the risk of pump blockage is reduced, and meanwhile, the permeation damage rate of a coal seam is small.

Description

technical field [0001] The invention belongs to the technical field of coal bed gas well development, and in particular relates to a coal bed gas well row adopting polymer pulverized coal sedimentation agent and its preparation method and application. Background technique [0002] Due to the complexity of tectonic-thermal evolution of my country's coal basins and the particularity of coal reservoirs, coal is an unconventional reservoir with high Poisson's ratio, low hardness, and is easily broken. Coal powder output is common in the process of coalbed methane development. . Most coal reservoirs are soft and poorly clamped. During the fracturing and drainage process of coalbed methane wells, coal rocks are prone to breakage, which makes fracturing proppant and coal powder regurgitation, and formation coal powder production is serious. The output of pulverized coal will cause damage to the drainage equipment, lead to stuck pumps and buried pumps, etc., shorten the pump inspect...

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): C08F220/58C08F220/06C08F230/02C08F220/20C08F222/38C08F2/30E21B43/00
CPCC08F2/30C08F220/06C08F220/58E21B43/006C08F230/02C08F220/20C08F222/385
Inventor 魏迎春孟涛张劲林亮王安民曹代勇王亚东赵萌
Owner CHINA UNIV OF MINING & TECH (BEIJING)