Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A temperature-resistant and salt-resistant high-expansion plugging agent for sealing large cracks and its preparation method

一种耐温抗盐、高膨胀的技术，应用在化学仪器和方法、粘合剂类型、钻孔的组合物等方向，能够解决结构破坏、不利环境保护、高毒性等问题，达到良好抗温、良好封堵效果的效果

Active Publication Date: 2020-07-31
SOUTHWEST PETROLEUM UNIV
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although it has good thermal stability and high water shutoff rate, for high-temperature and high-salt oil reservoirs in western my country, this kind of polymer jelly still has many technical problems that need to be solved. Degradation, the structure is destroyed; high salinity will cause dehydration of jelly plugging agent in the formation, volume shrinkage, and reduction of plugging agent strength, etc.
CN 102040975 A discloses a silicate water blocking agent. Although it is convenient to configure and low in price, its strength is low, and the gelation time at high temperature is short, so the field application is limited
In addition, there is a gel composed of lignosulfonate, phenol, formaldehyde, and polymers. Due to the high toxicity of phenolic aldehydes, its use is also restricted on site, which is not conducive to environmental protection; and the gelation time, pH and temperature range are required. It has limitations and is not suitable for high temperature and high salinity reservoirs

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
  • A temperature-resistant and salt-resistant high-expansion plugging agent for sealing large cracks and its preparation method
  • A temperature-resistant and salt-resistant high-expansion plugging agent for sealing large cracks and its preparation method
  • A temperature-resistant and salt-resistant high-expansion plugging agent for sealing large cracks and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A1: Preparation of montmorillonite dispersion system

[0026] Add 10 g of montmorillonite to 82.2 g of aqueous solution which is being stirred under a stirrer and stir for 5 hours. The rotational speed of the stirrer is 200 r / min, so that the montmorillonite can be well dispersed in water to obtain a montmorillonite dispersion system.

[0027] A2: Preparation of main agent solution

[0028] The main agent prepared by 3g acrylamide (AM), 2g acrylic acid (AA) and 1g 2-acrylamide-2-methylpropanesulfonic acid (AMPS), 0.8g phenolic crosslinking agent and 1g concentration of 1% azo Diisobutyronitrile initiator is added to the montmorillonite dispersion system prepared in step A1, stirred evenly with a glass rod, so that the main agent, crosslinking agent, and initiator can be well dissolved in the montmorillonite dispersion system to obtain the main agent solution.

[0029] A3: Preparation of blocking agent

[0030] Put the prepared solution into the aging tank, tighten th...

Embodiment 2

[0036] A1: Preparation of montmorillonite dispersion system

[0037] Add 6g of montmorillonite into 83.2g of the stirring aqueous solution, and stir for 4h to 5h, so that the montmorillonite is well dispersed in the water to obtain a montmorillonite dispersion system.

[0038] A2: Preparation of main agent solution

[0039] The main agent prepared by 4.5g acrylamide (AM), 1.5g 2-acrylamide-2-methylpropanesulfonic acid (AMPS) and 3g acrylic acid (AA), 0.8g phenolic cross-linking agent and 1g concentration of 1% coupling The nitrogen diisobutyronitrile initiator is added to the montmorillonite dispersion system prepared in step A1, and stirred evenly, so that the main agent, crosslinking agent, and initiator can be well dissolved in the montmorillonite dispersion system to obtain a main agent solution.

[0040] A3: Preparation of blocking agent

[0041] After putting the prepared solution into the aging tank, tighten the bolts of the aging tank to seal it, put it in a 120°C ov...

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 a temperature-resistant, salt-resistant, high-expansion plugging agent for sealing large cracks and a preparation method thereof. The agent system is composed of the following components in mass percentage: main agent 6%-10%, crosslinking agent 0.6% ~1%, initiator 0.006%~0.01%, additive 6%~14%, all the other are water; The preparation method provided by the invention comprises the following steps: adding montmorillonite to water to prepare montmorillonite dispersion system; Add the crosslinking agent and initiator to the montmorillonite dispersion system to prepare the main agent solution; put the main agent solution in an oven at 90-120°C to make it gel for 9-48 hours, and the gelling strength of this agent system can reach H level. The expansion multiple is 50-80 times, the strength after expansion is good, and the water shutoff effect is good under the conditions of 140°C and salinity of 250,000. The present invention is suitable for profile control and water shutoff in high temperature and high salt reservoirs to seal large fracture water channeling channels Operation.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to a temperature-resistant and salt-resistant high-expansion plugging agent for sealing large fractures and a preparation method thereof. Background technique [0002] High-temperature and high-salt reservoirs generally have high temperature (90-150°C) and high salinity (12×10 4 -20×10 4 mg / L), traditional plugging agents tend to have problems such as poor stability, easy dehydration, and poor strength under the conditions of high-temperature and high-salt reservoirs. When performing water plugging operations, if the strength of the plugging agent is not enough, there will be a series of problems such as high water content after water plugging, rapid decline in oil well production after recovery, and short validity period. The water shutoff effect in fractured-cavity reservoirs is one of the key factors for improving recovery and reducing costs in high water-...

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): C09K8/512
CPCC09K8/512C09K8/5083C04B26/04C09K8/426C09K8/5045C04B2111/763C04B2111/20C09J133/14C08F220/56C04B14/104C08F220/06C08F220/585
Inventor 金发扬高士博窦英杰李启航李科星杜代军宋书渝
Owner SOUTHWEST PETROLEUM UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com