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Water base drilling fluid, and preparation method 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 pollution, high cost, etc., and achieve the effect of enhancing the filtration loss reduction ability and strong inhibition

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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  • Water base drilling fluid, and preparation method and application thereof
  • Water base drilling fluid, and preparation method and application thereof
  • Water base drilling fluid, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Preparation of N,N-Dimethylallylaminopropanesulfonate

[0039] 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 93.7%.

Embodiment 2

[0045] Preparation of 4-vinylpyridinepropanesulfonate ylide (VPPS)

[0046] (1) Weigh 105g of 4-vinylpyridine (4-VP), 125g of 1,3-propane sultone (PS), 500g of organic solvent benzene, and 0.75g of diethylhydroxylamine;

[0047] (2) Divide the organic solvent benzene into three parts equally, dissolve and mix with 4-vinylpyridine, 1,3-propane sultone and auxiliary agent diethylhydroxylamine respectively;

[0048] (3) Add the obtained three mixed solutions into the reactor one by one, react at 70°C for 2h, then filter under reduced pressure, wash with benzene for 2-3 times, and dry at 50°C for 15h to obtain 4-ethylene Based on pyridyl propane sulfonate ylide (VPPS), 2136g of light yellow solid powder product was finally obtained after calculation.

Embodiment 3

[0050] Weigh 72g DAPS, 42g acrylamide (AM), 11g VPPS, add a certain amount of deionized water to dissolve and transfer to the reactor, the total monomer concentration is 25%. Access to N 2 Deoxygenation was performed for 1 hour, and the temperature was raised to 65° C., kept for 30 minutes, and then 1.3 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 zwitterionic copolymer.

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Abstract

The invention provides a water base drilling fluid, and a preparation method and application thereof. The drilling fluid comprises water, a zwitterionic polymer, anhydrous calcium chloride, a soil phase, and a flow pattern regulator, wherein, based on the weight of water, the usage amount of the zwitterionic polymer is 0.5 to 5 wt% of the usage amount of the water; the usage amount of the anhydrous calcium chloride is 20 to 70 wt% of the usage amount of the water; the usage amount of the soil phase is 0 to 6 wt% of the usage amount of the water; and the usage amount of the flow pattern regulator is 0.1 to 0.4 wt% of the usage amount of the water. The invention also provides a preparation method and application for the water base drilling fluid. According to the invention, through synergistic effects of the calcium chloride and the zwitterionic polymer, the water base drilling fluid in the invention has excellent rheological performance, filtration loss control performance, inhibition performance, sealing performance and lubrication 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 Applications(China)
IPC IPC(8): C09K8/16C09K8/24C08F220/56C08F226/06C08F228/02
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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