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

Method for preparing alkali-resistant water-absorbent resin suitable for oil well cement paste

A technology of oil well cement slurry and water-absorbing resin, which can be applied to chemical instruments and methods, compositions of drilling holes, etc., and can solve problems such as instability of amide groups.

Inactive Publication Date: 2015-05-20
CHINA UNIV OF PETROLEUM (EAST CHINA)
View PDF12 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the amide groups in the acrylamide / bentonite binary water-absorbent resin are unstable under alkaline conditions and are easily hydrolyzed into carboxylic acid groups

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
  • Method for preparing alkali-resistant water-absorbent resin suitable for oil well cement paste
  • Method for preparing alkali-resistant water-absorbent resin suitable for oil well cement paste
  • Method for preparing alkali-resistant water-absorbent resin suitable for oil well cement paste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Dissolve 20g of acrylamide and 0.04g of N, N-methylenebisacrylamide in 100g of water, add 3g of prehydrated montmorillonite (that is, 20g of prehydrated montmorillonite slurry with a mass fraction of 15%), and stir evenly . The mixture was poured into a four-necked flask, and nitrogen was blown. Another weighed 0.16g of potassium persulfate and 0.04g of sodium bisulfite were dissolved in 20g of water, and slowly dripped into a four-neck flask, stirring while adding, when the initiator was added dropwise, the temperature was raised to 40°C and stopped. Stir, pour the mixed liquid into a mold or continue to heat up to 55°C in a four-necked flask, and then react for 3.5 hours to obtain acrylamide and bentonite binary copolymerized water-absorbent resin.

Embodiment 2

[0024] Dissolve 15g of acrylamide, 5g of N, N-dimethylacrylamide and 0.04g of N, N-methylenebisacrylamide in 100g of water, add 3g of prehydrated montmorillonite (that is, 20g of prehydrated montmorillonite with a mass fraction of 15%) hydrated montmorillonite slurry), and stir evenly. The mixture was poured into a four-necked flask, and nitrogen was blown. Another weighed 0.16g of potassium persulfate and 0.04g of sodium bisulfite were dissolved in 20g of water, and slowly dripped into a four-neck flask, stirring while adding, when the initiator was added dropwise, the temperature was raised to 40°C and stopped. Stir, pour the mixed liquid into a mold or continue to heat up to 55°C in a four-necked flask, and then react for 3.5 hours to obtain acrylamide, N,N-dimethylacrylamide, and bentonite ternary copolymerized water-absorbent resin.

[0025] figure 1 It is the infrared spectrogram of the acrylamide, N, N-dimethylacrylamide, bentonite terpolymer water-absorbent resin pre...

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 discloses an alkali-resistant water-absorbent resin suitable for an oil well cement paste. During a process of synthesizing polyacrylamide / bentonite composite water-absorbent resin, and an N, N-dimethylacrylamide monomer is introduced to carry out ternary polymerization. The resin which is obtained through the method is applied to the oil well cement paste and is kept stable in the cement paste alkaline (pH=12-13) environments, the water absorbing capacity is basically unchanged, and the resin has the performances of salt resistance and high strength; and when set cement cracks or annular spaces are generated at a boundary, a sealing function is failed and stratum highly-mineralized water is caused to permeate, the resin in the set cement absorbs the water to expand so as to seal the cracks and the annular spaces, so that guarantee is provided for sealing oil-gas wells.

Description

technical field [0001] The invention relates to an alkali-resistant water-absorbing resin suitable for oil well cement slurry. The resin is stable in the alkaline environment of the cement slurry, and the water absorption is basically unchanged. When the cement stone seal fails, high-salinity water from the formation invades the cement stone, and the resin absorbs water and expands to seal the cement stone cracks and interfacial annulus. The invention belongs to the fields of oil and gas well cementing and oil field chemistry. Background technique [0002] The main function of cementing stone is to seal off the formation, prevent fluids from different formations from crossing each other, and ensure the safe and stable production of oil and gas wells. In order to meet this function, the cement stone is required to be impermeable for a long time. However, due to various engineering factors and complex downhole temperature and pressure factors, the sealing properties of cemen...

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 Patents(China)
IPC IPC(8): C08F220/56C08F220/54C08F222/38C08F2/44C08K3/34C09K8/467
Inventor 柳华杰步玉环郭胜来王春雨
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)