Supercharge Your Innovation With Domain-Expert AI Agents!

Decompression and injection augmentation agent for water injection well of medium-low-permeability oilfield and preparation method thereof

A technology for oilfield water injection and booster injection, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as high water injection pressure and water injection volume that cannot meet the injection requirements, so as to reduce water injection pressure and improve effective injection. Permeability, the effect of reducing the thickness of the hydration film

Inactive Publication Date: 2020-04-28
大庆松江石油钻采技术开发有限公司
View PDF1 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to solve the problem of high water injection pressure and water injection volume not meeting the injection requirements in the late stage of development of existing medium and low permeability reservoirs, and further provides a pressure reducing and increasing injection agent for water injection wells of medium and low permeability oilfields and a preparation method thereof

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
  • Decompression and injection augmentation agent for water injection well of medium-low-permeability oilfield and preparation method thereof
  • Decompression and injection augmentation agent for water injection well of medium-low-permeability oilfield and preparation method thereof
  • Decompression and injection augmentation agent for water injection well of medium-low-permeability oilfield and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] In terms of mass, the surface treatment agent of the present embodiment: 40% of nonionic surfactant (fatty alcohol polyoxyethylene ether AEO-9), 15% of anionic surfactant (sodium α-olefin sulfonate), amphoteric surfactant Agent (cocamidopropyl betaine) 45%;

[0030] The preparation method of the pressure-reducing and injection-increasing agent for medium and low permeability oilfield water injection wells of the present invention is realized according to the following steps:

[0031] First, add 35g of the compounded surfactant into a 1000mL flask, add 400mL of deionized water and stir evenly, then raise the temperature to 75°C, and stir at constant temperature for 55 minutes. At this time, the solution turns from turbid to clear;

[0032] When the temperature drops below 40°C, add 15g of hydrophobic nano-silica, add 15% sodium hydroxide aqueous solution to control the pH value between 12, and finally add 300mL of deionized water and stir evenly, then slowly heat up, wai...

Embodiment 3

[0040] In terms of mass, the surface treatment agent of the present embodiment: 40% of nonionic surfactant (polyoxyethylene sorbitan fatty acid ester), 15% of anionic surfactant (sodium dodecylbenzenesulfonate), amphoteric surface active agent Active agent (tetradecyl amidopropyl hydroxypropyl sultaine) 45%;

[0041] The pH regulator of the present embodiment is 8% sodium carbonate aqueous solution in mass percent.

[0042] The preparation method of the pressure-reducing and injection-increasing agent for medium and low permeability oil field water injection wells of the present embodiment is realized according to the following steps:

[0043] First add 25g of the compounded surfactant into a 1000mL flask, add 300mL of deionized water and stir evenly, then raise the temperature to 75°C, and stir at constant temperature for 50 minutes. At this time, the solution turns from turbid to clear;

[0044] When the temperature drops below 55°C, add 30g of hydrophobic nano-silicon diox...

Embodiment 4

[0046] In terms of mass, the surface treatment agent of the present embodiment: 40% of nonionic surfactant (polyoxyethylene sorbitan fatty acid ester), 15% of anionic surfactant (sodium dodecylbenzenesulfonate), amphoteric surface active agent Active agent (tetradecyl amidopropyl hydroxypropyl sultaine) 45%;

[0047] The pH regulator of the present embodiment is 8% sodium carbonate aqueous solution in mass percent.

[0048] The preparation method of the pressure-reducing and injection-increasing agent for medium and low permeability oil field water injection wells of the present embodiment is realized according to the following steps:

[0049] First add 25g of the compounded surfactant into a 1000mL flask, add 300mL of deionized water and stir evenly, then raise the temperature to 75°C, and stir at constant temperature for 50 minutes. At this time, the solution turns from turbid to clear;

[0050] When the temperature drops below 55°C, add 30g of hydrophobic nano-polysilicon an...

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
The average particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention discloses a decompression and injection augmentation agent for a water injection well of a medium-low-permeability oilfield and a preparation method and belongs to the technical field ofoilfields. The invention aims to solve the problems that the water injection pressure is high and the water injection amount cannot meet the injection allocation requirement in the later developmentperiod of the existing medium-low permeability oil reservoir. The decompression and injection augmentation agent comprises a surface treatment agent, hydrophobic nano silicon dioxide, a pH value regulator and deionized water, wherein the surface treatment agent consists of a nonionic surfactant, an anionic surfactant and an ampholytic surfactant. The method comprises the following steps: uniformlymixing a surface treatment agent with deionized water, heating, and stirring until the solution becomes clear; cooling to 45 DEG C or below, adding the nano silicon dioxide and the pH value regulator, and regulating the pH value of the solution to 10-15; and adding the rest deionized water, heating the solution, and stirring until the solution becomes a clear and transparent solution. The water-based injection augmentation agent prepared by the method can be easily dissolved in water, is simple to operate and environment-friendly in the use process, and does not generate secondary pollution in the well.

Description

technical field [0001] The invention belongs to the technical field of oil fields, and in particular relates to an injection booster for water injection wells and a preparation method thereof. Background technique [0002] In the late stage of development, medium and low permeability reservoirs often have high water injection pressure and small water injection volume, which cannot meet the injection allocation requirements. The main reason for the above situation is that the seepage resistance is large, the water injection pressure rises rapidly, and the water injection volume drops rapidly. , and eventually lead to no water injection, resulting in a rapid decline in the oil output of the oil well. At present, the conventional application is to use strong acid to treat water injection wells. Although the effect is fast, the effect is poor for medium and low permeability reservoirs, and it will also cause secondary pollution to the formation, and the effect of repeated acidif...

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): C09K8/584C09K8/58C09K8/52
CPCC09K8/52C09K8/58C09K8/584C09K2208/10C09K2208/12
Inventor 尚夺
Owner 大庆松江石油钻采技术开发有限公司
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com