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A kind of high-lubricating 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 fluids, can solve problems such as high cost and high pollution, and achieve the effects of strong inhibition and enhanced filtration reduction capability.

Active Publication Date: 2017-10-03
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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  • A kind of high-lubricating water-based drilling fluid and its preparation method and application
  • A kind of high-lubricating water-based drilling fluid and its preparation method and application
  • A kind of high-lubricating water-based drilling fluid and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] First prepare N,N-dimethylallyl propane sulfonate.

[0032]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

[0038] Weigh 100g of starch and add deionized water to gelatinize at 60°C for 30min, 2 Add 5g potassium persulfate after processing for 30min, weigh 100g AM respectively, add 170g DAPS into deionized water for dissolving, then transfer to the gelatinized starch reactor, the total mass concentration of monomer is 25%, after reacting for 5h, a colloidal solid is obtained, and the Washing with acetone gave a white precipitate. The white precipitate was dried at 70° C. for 12 h and crushed to obtain the final product.

Embodiment 3

[0040] Weigh 100g of starch and add deionized water to gelatinize at 60°C for 30min, 2 Add 3g potassium persulfate after processing for 30min, weigh 80g AM respectively, add 150g DAPS into deionized water to dissolve and then transfer to gelatinized starch reactor, the total mass concentration of monomer is 20%, after reacting for 6h, a colloidal solid is obtained, and Washing with acetone gave a white precipitate. The white precipitate was dried at 70° C. for 12 h and crushed to obtain the final product.

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Abstract

The invention provides a high-lubrication water-based drilling fluid and its preparation method and application. The drilling fluid includes water, zwitterionic modified starch, anhydrous calcium chloride, soil phase, and a flow regulator. Based on weight, 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 0.1-0.4wt% of water consumption. The invention also provides a preparation method and application of the 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 used in the oil drilling process, in particular to a drilling fluid containing a zwitterionic copolymer. 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 fluid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/24
Inventor 杨超鲁娇陈楠张志智尹泽群刘全杰
Owner CHINA PETROLEUM & CHEM CORP