Oil-displacement composition with improved injectivity, and preparation method and application thereof

A technology of injectability and composition, applied in the directions of drilling composition, chemical instruments and methods, etc., can solve the problems of small adsorption capacity of hydrophobically associating polymer, blockage of injectability, etc.

Active Publication Date: 2016-05-11
CHINA PETROLEUM & CHEM CORP +1
View PDF8 Cites 16 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] One of the technical problems to be solved by the present invention is that the hydrophobic association polymers in the prior art have a strong adsorption on the sandstone surface and are more likely to cause blockage at the formation pores, which leads to poor injectivity in the near-wellbore zone. , to provide a composition for oil displacement with improved injectability, which has the advantages of good injectability, small adsorption of hydrophobically associated polymers, and no clogging

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
  • Oil-displacement composition with improved injectivity, and preparation method and application thereof
  • Oil-displacement composition with improved injectivity, and preparation method and application thereof
  • Oil-displacement composition with improved injectivity, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] First add 2500g of deionized water to the reaction kettle, add 430g of acrylamide (AM), 150g of 2-acrylamido-2-methylpropanesulfonic acid (AMPS), 3.5g of sodium 2-acrylamidotetradecylsulfonate (NaAMC 14 S), 4.5g of acryloyloxyethyltrimethylammonium chloride (DAC), neutralized to neutral with NaOH, then added 0.04g of disodium edetate, 7g of urea, 0.07g of isopropanol, and stirred until completely dissolved. Adjust the pH value to 8.9 with NaOH, and start to feed high-purity nitrogen gas. After 30 minutes, the temperature in the kettle was lowered to 15°C, and then 10 g of 0.2% sodium bisulfite aqueous solution, 0.5% methacrylic acid N,N-di 10 g of methylaminoethyl ester (DMAEMA) aqueous solution, 10 g of 0.5% azobisisobutylamidine hydrochloride, 10 g of 0.3% potassium persulfate aqueous solution, continue to pass nitrogen gas for 30 minutes and then seal. After 1 hour, the reaction temperature was gradually raised to 52°C. After 3.5 hours of reaction, a gel-like polym...

Embodiment 2

[0067] First add 2600g of deionized water to the reaction kettle, add 480g of acrylamide (AM), 130g of 2-acrylamido-2-methylpropanesulfonic acid (AMPS), 4.0g of 2-acrylamido sodium dodecylsulfonate (NaAMC 12 S), 7.8g methacryloyloxyethyltrimethylammonium chloride (DMC) and 5.0g nitrogen vinylpyrrolidone (NVP), neutralized to neutral with NaOH, then added disodium edetate 0.045 g, urea 7.0g, isopropanol 0.06g, stir until completely dissolved. Adjust the pH value to 9.0 with NaOH, and start feeding high-purity nitrogen gas. After 30 minutes, the temperature in the kettle was lowered to 16°C, and then 10.2 g of 0.2% aqueous sodium bisulfite solution, 0.5% acrylic acid N,N-dimethyl Aminoethyl ester (DA) aqueous solution 11g, 0.5% azobisisobutylamidine hydrochloride 11.9g, 0.3% potassium persulfate aqueous solution 11.2g, continue nitrogen gas for 30min and then seal. After 1 hour, the reaction temperature was gradually raised to 58° C., and after 3 hours of reaction, a gelatinou...

Embodiment 3

[0070] First add 2700g of deionized water to the reaction kettle, add 500g of acrylamide (AM), 150g of 2-acrylamido-2-methylpropanesulfonic acid (AMPS), 5.2g of sodium 2-acrylamido hexadecylsulfonate (NaAMC 16 S) and 9.4g dimethyl diallyl ammonium chloride (DMDAAC), neutralized to neutral with NaOH, then add disodium edetate 0.05g, urea 8.0g, isopropanol 0.07g, stir until completely dissolved. Adjust the pH value to 9.5 with NaOH, and start to feed high-purity nitrogen gas. After 30 minutes, the temperature in the kettle was lowered to 20°C, and then 10.2 g of 0.2% aqueous sodium bisulfite solution, 0.5% acrylic acid N,N-dimethyl 12.1 g of aminoethyl ester (DA) aqueous solution, 12 g of 0.5% 2,2'-azo[2-(2-imidazolin-2-yl) propane] dihydrochloride, 11 g of 0.3% potassium persulfate aqueous solution, Continue to pass nitrogen gas for 30 minutes before sealing. After 1 hour, the reaction temperature was gradually raised to 55°C. After 2.5 hours of reaction, a gel-like polymer ...

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 relates to an oil-displacement composition with improved injectivity, and a preparation method and application thereof. The main objective of the invention is to overcome the problems of poor injectivity at zones near a well on site due to proneness to obstruction at pore throats of strata caused by strong adsorption effect of hydrophobic associated polymers on the surface of sandstone. The oil-displacement composition with improved injectivity comprises, by weight, 0.01 to 1 part of an anti-adsorption agent, 0.3 to 3 parts of a hydrophobic associated polymer and 96 to 99.69 parts of water, wherein the anti-adsorption agent is at least one or a mixture of two or more selected from a group consisting of nonionic surfactants and anionic surfactants. The oil-displacement composition provided by the invention perfectly overcome the above-mentioned problem and can be used for on-site injection of a polymer fluidity control agent into a high-temperature high-salt severe oil reservoir for oil displacement.

Description

technical field [0001] The invention relates to a composition for oil displacement with improved injectability, a preparation method and application thereof. Background technique [0002] After primary and secondary oil recovery in major domestic oil fields, the water content of crude oil continues to increase, and some large oil fields have entered the stage of tertiary oil recovery. Polymer flooding is the main technical method of tertiary oil recovery. The oil flooding mechanism is clear, the process is relatively simple, and the technology is becoming more and more mature. It is an effective technical measure for enhancing oil recovery. The oil displacement mechanism of the polymer is mainly to use the viscosity of the water-soluble polyacrylamide molecular chain to improve the mobility ratio of the displacement fluid, increase the displacement efficiency and the swept volume, so as to achieve the purpose of enhancing the recovery factor. Due to the long tertiary oil re...

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): C09K8/588C08F220/56C08F220/58C08F220/34C08F226/10C08F226/02C08F220/06C08F4/40
Inventor 夏燕敏苏智青许汇蔡红宋晓芳王兰
Owner CHINA PETROLEUM & CHEM CORP
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