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

A kind of strongly inhibited water-based drilling fluid and its preparation method and application

A water-based drilling fluid and drilling fluid technology, applied in the field of drilling fluid, can solve the problems of high pollution and high cost, and achieve the effect of enhancing filtration loss reduction ability and strong inhibition.

Active Publication Date: 2018-06-15
CHINA PETROLEUM & CHEM CORP +1
View PDF10 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, oil-based drilling fluid is mainly used in the drilling process of domestic shale gas horizontal wells, but the high cost and high pollution of oil-based drilling fluid are its natural defects

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 kind of strongly inhibited water-based drilling fluid and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] First prepare N,N-dimethylallyl propane sulfonate.

[0033]Weigh 430g of N,N-dimethylallylamine (DA) into the reactor, then put it into a constant temperature water bath, heat and start stirring. Then weigh 122g of 1,3-propane sultone (PS), add it directly into DA, the reaction temperature is 45°C, stir and react for 3 hours to obtain N,N-dimethylallyl propane sulfonate (DAPS) crude products. Transfer the crude DAPS product to a large piece of filter paper, wrap it in a Soxhlet extractor, and use ethanol as a solvent to extract for 3 hours. After the extraction, put the filter paper bag in a drying box and dry it at 50°C to obtain Pure DAPS monomer with a yield of 94.3%.

Embodiment 2

[0039] Weigh 103gDAPS and 35gAM respectively, add a certain amount of deionized water to dissolve and transfer to the reactor, the total monomer concentration is 35%. Access to N 2 Deoxygenation was performed for 1 hour, and the temperature was raised to 60° C., kept for 30 minutes, and then 0.7 g of potassium persulfate was added. After 6 hours of reaction, a gel-like solid was obtained, which was precipitated with acetone to obtain a white precipitate. After drying at 110°C for 24 hours, it was pulverized to obtain a DAPS / AM zwitterionic copolymer.

Embodiment 3

[0041] Weigh 60gDAPS, 50gAM, 15gNaCl respectively, add a certain amount of deionized water to dissolve and transfer to the reactor, the total monomer concentration is 40%. Access to N 2 Deoxygenation was performed for 1 hour, and the temperature was raised to 55° C., kept for 30 minutes, and then 0.75 g of ammonium persulfate was added. After 5 hours of reaction, a gel-like solid was obtained, which was precipitated with acetone to obtain a white precipitate. After drying at 110°C for 24 hours, it was pulverized to obtain a DAPS / AM zwitterionic copolymer.

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 present invention provides a strong inhibition water-based drilling fluid and its synthesis method and application. The drilling fluid includes water, zwitterionic polymer, anhydrous calcium chloride, soil phase, flow pattern regulator, wherein the weight of water As a benchmark, the dosage of zwitterionic polymer is 0.5-5wt% of water consumption, the dosage of anhydrous calcium chloride is 20-70wt% of water consumption, the dosage of soil phase is 0-6wt% of water consumption, and the dosage of flow regulator is 0.1‑0.4wt% of water usage. The invention also provides a synthesis method and application of water-based drilling fluid. Through the synergistic effect of the calcium chloride and the zwitterionic polymer, the drilling fluid of the invention has excellent rheological properties, fluid loss control performance, suppression performance, plugging performance and lubricating performance.

Description

technical field [0001] The invention relates to a drilling fluid, in particular to a drilling fluid containing zwitterionic polymer. Background technique [0002] In view of the characteristics of shale gas formations such as developed fractures, strong water sensitivity, easy lost circulation, collapse, and diameter shrinkage, solving problems such as wellbore stability, drag reduction and friction reduction during drilling has become the top priority in the selection of drilling fluids . At present, oil-based drilling fluid is mainly used in the drilling process of domestic shale gas horizontal wells, but the high cost and high pollution of oil-based drilling fluid are its natural defects. If water-based drilling fluids can achieve breakthroughs in suppression, plugging, lubrication, carrying rock and removing sand, etc., the application prospects in shale gas horizontal wells will be very great. At present, water-based drilling fluids with great application potential in...

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): C09K8/24C09K8/16C08F220/56C08F226/02
Inventor 杨超鲁娇陈楠张志智尹泽群刘全杰
Owner CHINA PETROLEUM & CHEM 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