A kind of drilling fluid with strong inhibition and its preparation method and application

A drilling fluid and water-based 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: 2018-04-10
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 drilling fluid with strong inhibition and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] First prepare methacryloyloxyethyl-N,N-dimethylpropanesulfonate (DMAPS)

[0039] Weigh 630g of dimethylaminoethyl methacrylate (DM) into the reactor, then put it into a constant temperature water bath, heat and start stirring. Then 122g of 1,3-propane sultone (PS) was weighed and directly added to DM at a reaction temperature of 35°C. After stirring for 1.5h, the crude product of DMAPS was obtained. Transfer the crude DMAPS product to a large piece of filter paper, wrap it in a Soxhlet extractor, and use ethanol as a solvent to extract it for 1 hour. After the extraction, put the filter paper bag in a drying oven and dry it at 40°C to obtain The pure DMAPS monomer has a yield of 92.8%, (the yield is the ratio of the mass of the product actually obtained and the mass of the theoretical product obtained by the stoichiometric reaction).

Embodiment 2

[0045] Preparation of 4-vinylpyridinepropanesulfonic acid 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 Base pyridine propanesulfonic acid ylide, finally obtain 2136g of light yellow solid powder product through calculation.

Embodiment 3

[0050] Weigh 50gDMAPS, 60gAM and 40gVPPS 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 0.9 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 finally obtain DMAPS / AM / VPPS zwitterionic copolymer.

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Abstract

The invention provides a drilling fluid with a high inhibition property and a preparation method and an application thereof. The drilling fluid comprises water, amphion modified starch, anhydrous calcium chloride, a soil phase and a flow pattern conditioning agent, wherein the weight of water is used as a reference, the amount of the amphion polymer is 0.5-5wt% of the amount of water, the amount of anhydrous calcium chloride is 20-70wt% of the amount of water, the amount of the soil phase is 0-6wt% of the amount of water, and the flow pattern conditioning agent is 0.1-0.4wt% of the amount of water. The invention also provides a water base drilling fluid preparation method and an application. According to the invention, a synergistic effect of calcium chloride and the amphion polymer is provided, so that the drilling fluid has the advantages of good 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 Patents(China)
IPC IPC(8): C09K8/24C08F220/56C08F220/38C08F226/06
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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