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

Composite oxidation blocking remover

A technology of composite oxidation and plugging agent, which is applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of weak organic peroxide oxidation, long time of organic blockage, strong oxidation, etc. The effects of controllable activity release, safe and convenient storage and transportation, and simple construction and operation

Inactive Publication Date: 2016-12-07
CHINA NAT OFFSHORE OIL CORP +1
View PDF6 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The depolymerization systems that have been used in Bohai Oilfield include calcium peroxide system, organic benzoyl peroxide system, chlorine dioxide stabilization / generation liquid system and biological acid system, but these systems have certain defects, such as oxidant and activator Problems of coexistence and active release control, weak oxidative properties of organic peroxides, too strong oxidative properties of chlorine dioxide stabilized solution / generated solution, poor degradation of cross-linked polymers and aging cross-linked polymers, etc. Problems such as long blockage time and relatively limited degradation effect
In terms of on-site construction, during the on-site application of the currently used depolymerization system, the oxidizing agent and the activator must be separated during storage and transportation, and must be prepared separately during on-site preparation. The double-liquid extrusion method must be used for extrusion injection. The two agents are mixed at the wellhead. The activity starts to be released immediately, the construction process is difficult and demanding, and the activity release is difficult to control after the plugging solution is mixed at the wellhead, and there are certain safety hazards
[0005] As an efficient degradable polymer organic plugging system, the performance of the oxidation system is gradually recognized by people, but its storage and transportation safety hazards, control of activity release, high requirements for construction and comprehensive performance of chemicals limit its application in offshore oilfields. application

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Preparation of polyvinylidene chloride-wrapped organic acid microcapsules: Add polyvinylidene chloride to light oil to make an emulsion, sieve the solid organic acid to obtain particles with uniform particle size, spray the particles with the emulsion, and dry to obtain Microcapsules with a particle size of 100-1000 μm and a wall thickness of 10-150 μm.

[0017] The particle size and wall thickness of the product can be adjusted according to actual work needs.

Embodiment 2

[0019] A kind of composite oxidative plug-removing agent, is made up of following components by mass: 63% calcium peroxide solid powder, 20% polyvinylidene wrapped citric acid microcapsules, 15% sodium chlorite and 2% disodium edetate.

[0020] The particle size of the microcapsules in this embodiment is 100-200 μm, and the wall thickness is 10-20 μm.

[0021] Example 2

[0022] A composite oxidation plugging agent, composed of the following components by mass: 58% calcium peroxide solid powder, 30% polyvinylidene-wrapped oxalic acid microcapsules, 10% potassium persulfate and 2% alkane base polyoxyethylene ether.

[0023] The particle size of the microcapsules in this embodiment is 200-400 μm, and the wall thickness is 10-50 μm.

Embodiment 3

[0025] A kind of composite oxidative plug-removing agent, is made up of following components by mass: 66% calcium peroxide solid powder, 15% polyvinylidene wrapped microcapsules of tartaric acid, 18% ammonium persulfate and 1% chlorine Potassium chloride.

[0026] The particle size of the microcapsules in this embodiment is 400-600 μm, and the wall thickness is 40-60 μm.

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
particle diameteraaaaaaaaaa
thicknessaaaaaaaaaa
particle diameteraaaaaaaaaa
Login to View More

Abstract

The invention discloses a composite oxidation blocking remover. The composite oxidation blocking remover comprises, by mass, 50-70% of calcium peroxide solid powder, 15-30% of polyvinylidene chloride coated organic acid microspheres, 10-18% of an oxidant assistant and 1-2% of an additive. The composite oxidation blocking remover solves the disadvantages of single main agent, limited comprehensive performances, large active release control difficulty, hidden safety troubles in storage and transportation and high construction requirements of present oxidation systems in present Bohai Sea oilfields, becomes a stable solid powder particle at normal temperature, and is safe and convenient to store and transport; and when the composite oxidation blocking remover is used in field, the composite oxidation blocking remover is directly dissolved in normal temperature according to above formula proportions, the obtained solution is extruded to stratum, the stratum is heated to rupture the polyvinylidene chloride coated organic acid microspheres, release the organic acid and activate an oxidant, and the oxidant activity is extensively released to degrade organic blocking materials. The composite oxidation blocking remover has the advantages of simplicity in construction operation, and controllable oxidation activity release.

Description

technical field [0001] The invention relates to a composite oxidation plug-removing agent. Background technique [0002] During the development of polymer flooding in Bohai Oilfield, the problem of under-injection under high pressure in polymer injection wells gradually emerged. For the polymer injection oilfields in the Bohai Sea, although the polymers used are different, they are all polyacrylamide polymers. Polymer injection well blockage mainly includes conventional inorganic blockage and polymer organic blockage. Uneven dilution of dry powder to form fish eyes, traces of water-insoluble matter in dry polymer powder, polymer and high-valent metal cations to form cross-linked polymers, polymers and inorganic particles such as clay and carbonate to form composite plugs, etc. . [0003] Most of the early Bohai Sea polymer injection wells used conventional acidification plugging removal technology, and achieved a certain effect of reducing pressure and increasing injectio...

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): C09K8/524
Inventor 黄利平易飞周际永黄波赵文森孟向丽苏延辉崔盈贤高建崇
Owner CHINA NAT OFFSHORE OIL CORP
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