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Strongly inhibitory water-based drilling fluid, preparation method therefor and application thereof

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

Active Publication Date: 2015-11-25
CHINA PETROLEUM & CHEM CORP +1
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  • 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

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  • Strongly inhibitory water-based drilling fluid, preparation method therefor and application thereof

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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.

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Abstract

The invention provides a strongly inhibitory water-based drilling fluid, a preparation method therefor and application thereof. The drilling fluid comprises water, an amphoteric ionic polymer, anhydrous calcium chloride, a soil phase and a flow pattern modifier, wherein based on the water weight, the amphoteric ionic polymer accounts for 0.5-5 wt%, the anhydrous calcium chloride accounts for 20-70 wt%, the soil phase accounts for 0-6 wt% and the flow pattern modifier accounts for 0.1-0.4 wt%. The invention further provides a synthesis method for the water-based drilling fluid and application thereof. According to the drilling liquid provided by the invention, by virtue of a synergistic effect of the calcium chloride and the amphoteric ionic polymer, the drilling fluid has good rheological performance, filtration control performance, inhibition performance, sealing 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

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Application Information

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Patent Type & Authority Applications(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
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