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

Environment-friendly clay stabilizer

A clay stabilizer and environment-friendly technology, applied in the field of downhole operations in oil and gas field exploration and development, can solve problems such as high biological toxicity, carcinogenic effects, and impact on the ecological environment, and achieve high temperature resistance, high anti-swelling performance, and excellent environmental protection. Effect

Inactive Publication Date: 2019-04-02
CNPC BOHAI DRILLING ENG
View PDF7 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In summary, the above-mentioned conventional clay stabilizers have the following deficiencies: (1) the addition of the clay temporary stabilizer KCl causes the system to contain higher concentrations of chloride ions, which will combine with organic matter in the environment to form a Chlorinated compounds with three effects (mutagenic effect, teratogenic effect, carcinogenic effect), seriously affect the ecological environment; (2) existing clay stabilizers such as polyammonium salts or quaternary ammonium salts have higher biological toxicity
It can be seen that the introduction of non-environmentally friendly clay stabilizers will inevitably bring environmental protection pressure. After they are discharged to the ground, they must be treated in a harmless manner, which in turn increases the cost of oil and gas field development.

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
  • Environment-friendly clay stabilizer
  • Environment-friendly clay stabilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] An environmentally friendly clay stabilizer, the specific preparation steps are as follows:

[0031] S1. Dissolve 100g of N-aminoethylethanolamine in 240mL of water; while stirring, heat up to 30°C, add 170g, 37wt.% formaldehyde aqueous solution dropwise, after the dropwise addition, heat up to 80°C, and then add 140g chlorine dropwise Benzyl benzyl chloride, keep at 80°C and continue to react for 3 hours after the dropwise addition is completed to obtain benzyl quaternary ammonium salt;

[0032] S2. Dissolve 110g of N-aminoethylethanolamine in 300mL of water; under stirring, heat up to 40°C, add 180g, 37wt.% formaldehyde aqueous solution dropwise for 30min, after the addition, warm up to 80°C, then dropwise Add 80g of dichloroethyl ether, which lasts for 10 minutes, after the addition, the temperature is raised to 90°C, and the reaction is continued for 16 hours to obtain the heterocyclic polyquaternary ammonium salt;

[0033] S3. Dissolve 165g of diethanolamine in 210mL of ...

Embodiment 2

[0036] S1. Dissolve 140g of N-aminoethylethanolamine in 280mL of water; while stirring, keep the temperature at 45°C, add 190g, 37wt.% formaldehyde aqueous solution dropwise, after the dropwise addition, heat to 90°C, and then add 150g chlorine dropwise Benzyl benzyl ammonium salt is maintained at 90°C for 4 hours after the dropwise addition is completed to obtain benzyl quaternary ammonium salt;

[0037] S2. Mix 130 g of N-aminoethylethanolamine and 320 mL of water, and maintain the temperature at 55°C under stirring. Add 190g of 37wt.% formaldehyde aqueous solution dropwise. After 30 minutes of dropping, the temperature is raised to 90°C, and then 90g of dichloroethyl ether is added dropwise for 10 minutes. After the dropping, the temperature is raised to 110°C, and the reaction is continued for 20 hours to obtain a heterocyclic polyquaternium. Ammonium salt

[0038] S3. Dissolve 175g of diethanolamine in 230mL of water; while stirring, heat up to 55°C, add 70g, 37wt.% formaldeh...

Embodiment 3

[0041] S1. Dissolve 120g of N-aminoethylethanolamine in 260mL of water; while stirring, heat up to 40°C, add 180g, 37wt.% formaldehyde aqueous solution dropwise, after the dropwise addition, heat up to 85°C, and then add 145g chlorine dropwise Benzyl benzyl chloride, keep at 85°C and continue to react for 3.5 hours after the dropwise addition is completed to obtain benzyl quaternary ammonium salt;

[0042] S2. Combine 120g of N-aminoethylethanolamine and 310mL of water; under stirring conditions, heat up to 50°C, add 185g of 37wt.% formaldehyde aqueous solution dropwise for 30 minutes, after the addition, heat up to 85°C, and then add 85g of water dropwise. Chloroethyl ether, which lasted 10 minutes, heated to 100°C after dripping, and continued to react for 18 hours to obtain heterocyclic polyquaternary ammonium salt;

[0043] S3. Dissolve 170g of diethanolamine in 220mL of water; while stirring, heat to 50°C, add 65g, 37wt.% formaldehyde aqueous solution dropwise for 25min, after...

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
Lc50aaaaaaaaaa
Login to View More

Abstract

The invention discloses an environment-friendly clay stabilizer. The environment-friendly clay stabilizer comprises, in parts by weight, 5-30 parts of a benzyl quaternary ammonium salt, 10-30 parts ofa heterocyclic polyquaternary ammonium salt, 35-40 parts of a sulfonyl quaternary ammonium salt and 5-40 parts of choline chloride, wherein the benzyl quaternary ammonium salt is prepared through a reaction among N-aminoethyl ethanolamine, formaldehyde and benzyl chloride, the heterocyclic polyquaternary ammonium salt is prepared through a reaction among N-aminoethyl ethanolamine, formaldehyde and dichlorodiethyl ether, and the sulfonyl quaternary ammonium salt is prepared through a reaction among diethanolamine, formaldehyde, diethyl sulfate and bis(diethanolamine) methane. The clay stabilizer has a wide pH application environment, high temperature resistance and high anti-expansion performance at the same time, is suitable for various downhole working liquids with pH values of 1-14, andhas resistance to a high temperature of 150 DEG C, an anti-swelling rate of larger than 88% and an anti-swelling performance duration time of more than 1 month, and it is verified through biocompatibility experiments that the semi-lethal concentration LC50 of the clay stabilizer is larger than 10000 mg / L; and therefore, the clay stabilizer has excellent environmental protection, and is suitable for an additive for preparation of fracturing fluids, acid solutions, perforating liquids, workover fluids and other types of downhole working fluids.

Description

Technical field [0001] The invention relates to the technical field of downhole operations for exploration and development of oil and gas fields, in particular to an environmentally friendly clay stabilizer. Background technique [0002] Clay minerals mainly include montmorillonite, kaolinite, illite, chlorite, Imonite mixed layer, green smudge layer and so on. Clay minerals are widely present in oil and gas reservoirs. When these clay mineral particles encounter external water-based fluids during oilfield exploration and development, such as drilling, completion, acidification, fracturing, and water injection, they will swell or migrate by themselves, thereby affecting pores or fractured media. Cause blockage, affect permeability and oil and gas well production. Generally, in order to protect the permeability of oil and gas formations and increase oil and gas production, in the process of fracturing acidification or workover operations, in the process of fracturing and acidifi...

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): C09K8/035C09K8/60
CPCC09K8/035C09K8/607C09K2208/12
Inventor 邹鹏刘林李晓祥杨津李博呼桂艳刘泽宇曹宁曹雅坤周婷
Owner CNPC BOHAI DRILLING ENG
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