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An oil-based emulsified drilling fluid with an ultra-low oil-water ratio of 40:60

A technology of emulsified drilling fluid and oil-water ratio, applied in the direction of drilling composition, chemical instruments and methods, etc., can solve problems such as poor stability, achieve wide application range, significant economic benefits, and improve stability performance

Active Publication Date: 2017-08-25
HUBEI HANC NEW TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Mark Luyster et al. developed an oil-based emulsified drilling fluid with an oil-water ratio of 50:50-20:80 using a new self-made emulsifier, but the stability of the system is not good.
In China, there are few studies on oil-based emulsified drilling fluids with an oil-water ratio below 70:30, and oil-based drilling fluids with an oil-water ratio of 40:60 have not been reported yet.

Method used

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  • An oil-based emulsified drilling fluid with an ultra-low oil-water ratio of 40:60

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] First determine the weight of each part according to the preparation requirements, and then weigh the raw materials according to the following parts by weight.

[0037] 40 parts of 3# white oil,

[0038] 60 parts of 30% calcium chloride brine,

[0039] 3 parts of high-efficiency emulsifier, composed of cetyl trimethyl ammonium chloride, didodecyl dimethyl ammonium chloride, lauryl amidopropyl amine oxide, cetyl polyethylene glycol / polypropylene glycol-10 / 1 Dimethylsiloxane is prepared by mixing and stirring for 20 minutes at a temperature of 80°C and a stirring speed of 3000 rpm; hexadecyl trimethyl ammonium chloride: didodecyl dimethyl ammonium chloride : Lauramidopropylamine Oxide: Cetyl Polyethylene Glycol / Polypropylene Glycol-10 / 1 Dimethicone The ratio is 1.5︰1︰3︰4;

[0040] 2 parts of emulsion stabilizer, prepared by mixing polystyrene, fatty alcohol polyoxyethylene ether sodium sulfate AES, octanol, and ethylene glycol monobutyl ether at a temperature of 80°C a...

Embodiment 2

[0046] First determine the weight of each part according to the preparation requirements, and then weigh the raw materials according to the following parts by weight.

[0047] 40 parts of 3# white oil,

[0048] 60 parts of 30% calcium chloride brine,

[0049] 2 parts of high-efficiency emulsifier, consisting of cetyl trimethyl ammonium chloride, didodecyl dimethyl ammonium chloride, lauryl amidopropyl amine oxide, cetyl polyethylene glycol / polypropylene glycol ~10 / 1 Dimethylsiloxane is prepared by mixing and stirring for 20 minutes at a temperature of 80°C and a stirring speed of 3000 rpm; hexadecyl trimethyl ammonium chloride: didodecyl dimethyl ammonium chloride : Lauramidopropylamine Oxide: The ratio of Cetyl Polyethylene Glycol / Polypropylene Glycol-10 / 1 Dimethicone is 0.5︰0.5︰2.0︰3.0;

[0050] 1 part of emulsification stabilizer, prepared by mixing polystyrene, fatty alcohol polyoxyethylene ether sodium sulfate AES, octanol, and ethylene glycol monobutyl ether at a temp...

Embodiment 3

[0056] First determine the weight of each part according to the preparation requirements, and then weigh the raw materials according to the following parts by weight.

[0057] 40 parts of 3# white oil,

[0058] 60 parts of 30% calcium chloride brine,

[0059] 5 parts of high-efficiency emulsifier, composed of cetyl trimethyl ammonium chloride, didodecyl dimethyl ammonium chloride, lauryl amidopropyl amine oxide, cetyl polyethylene glycol / polypropylene glycol ~10 / 1 Dimethylsiloxane is prepared by mixing and stirring for 20 minutes at a temperature of 80°C and a stirring speed of 3000 rpm; hexadecyl trimethyl ammonium chloride: didodecyl dimethyl ammonium chloride : Lauramidopropylamine Oxide: Cetyl Polyethylene Glycol / Polypropylene Glycol ~ 10 / 1 Dimethicone The ratio is 2: 1.5: 4: 5;

[0060] 3 parts of emulsion stabilizer, prepared by mixing polystyrene, fatty alcohol polyoxyethylene ether sodium sulfate AES, octanol, and ethylene glycol monobutyl ether at a temperature o...

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Abstract

Belonging to the technical field of oil based drilling fluid of petroleum drilling, the invention relates to an oil based emulsified drilling fluid with an ultralow oil-water ratio of 40:60. The raw materials include: 40 parts of 3# white oil, 60 parts of 30% calcium chloride brine, 2-5 parts of an efficient emulsifier, 1-3 parts of an emulsifying stabilizer, 1-3.0 parts of a filtrate reducer, 1-5 parts of lime, and 20-50 parts of barite. The preparation method includes: putting the components into a 10000rpm high speed mixer according to the arrangement order, conducting stirring for 5min after putting a component raw material, and when all the component raw materials are added and mixed well, further conducting high speed stirring for 60min under normal temperature and pressure, thus obtaining the product. The oil based emulsified drilling fluid provided by the invention has good emulsifying stability, cuttings carrying capacity and well wall stability, thus being able to greatly reduce the oil based emulsified drilling fluid preparation and petroleum and natural gas drilling cost. The oil based emulsified drilling fluid solves the problems of great viscosity effect, poor rheological properties and difficult regulation of filtration loss in existing oil based drilling fluid with low oil-water ratio.

Description

technical field [0001] The invention relates to an oil-based emulsified drilling fluid with an ultra-low oil-water ratio of 40:60, belonging to the technical field of oil-based drilling fluids for petroleum drilling. Background technique [0002] Oil-based drilling fluid has the advantages of high temperature resistance, salt and calcium intrusion resistance, wellbore stability, good lubricity, and less damage to oil and gas layers. An important means for directional wells and wells in various complex formations. Oil-based drilling fluids use diesel oil or white oil as the continuous phase, and the water phase as the dispersed phase. Emulsifiers and lipophilic colloids are used to maintain emulsification stability, and wetting agents are used to improve the lipophilicity of the system to weight materials and cuttings. At present, the oil-water volume ratio of oil-based emulsified drilling fluid is usually 80:20-90:10. An increase in the proportion of the water phase will d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/32
CPCC09K8/32
Inventor 王荐向兴金舒福昌吴彬周文涛蒋卓崔应中史茂勇
Owner HUBEI HANC NEW TECH
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