Water-in-oil emulsion, preparation method thereof and oil-based drilling fluid

An oil-based drilling fluid, water-in-oil technology, applied in the field of drilling, can solve the problems of limiting drilling efficiency, lack of constant rheological properties in a wide temperature range, and high equivalent circulating density, and achieves excellent stability and excellent wide temperature range. Effects of constant rheological properties

Inactive Publication Date: 2019-07-12
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the existing oil-based drilling fluid systems contain organic soils. At high temperatures, organic soils will undergo irreversible flocculation and gelation; Obvious gelation phenomenon, so that the equivalent circulating density is too high, and then lead to problems such as lost circulation. For example, in the temperature range of 5 ° C to 75 ° C, the oil-based drilling fluid system containing organic soil thickens significantly, and the viscosity change rate is as high as 80%, which greatly limits the drilling efficiency
Therefore, the oil-based drilling fluid system containing organic soil does not have good constant rheological properties in a wide temperature range, and it is difficult to operate in a wide temperature range

Method used

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  • Water-in-oil emulsion, preparation method thereof and oil-based drilling fluid
  • Water-in-oil emulsion, preparation method thereof and oil-based drilling fluid
  • Water-in-oil emulsion, preparation method thereof and oil-based drilling fluid

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Weigh 0.5 parts by weight of methyl-modified fumed silica (the three-phase contact angle of the particles is 128°) and 60 parts by weight of gas-to-oil; add methyl-modified fumed silica particles to gas-to-oil, set the magnetic force The stirring speed is 600 rev / min, stirring for 10 minutes to disperse the methyl-modified fumed silica particles evenly in the gas-to-oil; weigh 39.5 parts by weight of calcium chloride aqueous solution with a concentration of 25wt%, and add it to the methyl-modified In the gas-phase silica particle-oil phase dispersion system, continue to magnetically stir at 600 rpm for 10 minutes and then sonicate, the ultrasonic power is 200W, and the ultrasonic time is 100s, and the water-in-oil emulsion is obtained.

Embodiment 2

[0026] Weigh 1 part by weight of ethyl-modified fumed silica (the three-phase contact angle of the particles is 143°) and 70 parts by weight of 3# white oil; add the ethyl-modified fumed silica particles to 3# white oil, set The rotating speed of constant magnetic stirring is 600 rev / min, and stirring for 10 minutes makes the ethyl modified fumed silicon oxide particles evenly dispersed in 3# white oil; Weigh 29.5 parts by weight of calcium chloride aqueous solution with a concentration of 15wt%, add it to In the ethyl-modified fumed silicon oxide particles-oil phase dispersion system, continue to magnetically stir at 600 rpm for 10 minutes and then ultrasonicate with an ultrasonic power of 200W and an ultrasonic time of 100s to obtain a water-in-oil emulsion.

Embodiment 3

[0028] Weigh 1.5 parts by weight of isopropyl modified fumed silica (the three-phase contact angle of the particles is 128°) and 80 parts by weight of 5# white oil; add the isopropyl modified fumed silica particles to 5# white oil , set the rotating speed of magnetic stirring to be 600 rpm, stir for 10 minutes to make the isopropyl modified fumed silicon oxide particles uniform in 5# white oil; take 19.5 parts by weight of calcium chloride aqueous solution with a concentration of 25wt%, and mix it Add isopropyl modified fumed silica particles-oil phase dispersion system, continue to magnetically stir at 600 rpm for 10 minutes, and then ultrasonicate with an ultrasonic power of 400W and an ultrasonic time of 50s to obtain a water-in-oil emulsion.

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Abstract

Provided are a water-in-oil emulsion, a preparation method thereof and an oil-based drilling fluid. The water-in-oil emulsion comprises an oil phase, an aqueous phase and hydrophobically modified gas-phase silica, wherein the content of the oil phase is 60-90 parts by weight, the content of the aqueous phase is 10-40 parts by weight, and the content of the hydrophobically modified gas-phase silicais 0.5-1.5 parts by weight, based on 100 parts by weight of the total content of the oil phase and the aqueous phase. The method comprises the following steps: dispersing the hydrophobically modifiedgas-phase silica in the oil phase and executing stirring to obtain a hydrophobically modified gas-phase silica-oil dispersion system; adding the aqueous phase to the hydrophobically modified gas-phase silica-oil dispersion system, carrying out ultrasonic emulsification after stirring to obtain the water-in-oil emulsion. The water-in-oil emulsion has excellent stability and wide-temperature-rangeconstant rheological property, and can be used for simulating or constructing soilless phase oil-based drilling fluids suitable for drilling engineering of deep water and frozen soil zone low-temperature formations.

Description

technical field [0001] The present application relates to the technical field of drilling, in particular to a water-in-oil emulsion, a preparation method thereof and an oil-based drilling fluid. Background technique [0002] Deep water and permafrost are rich in oil and gas resources and have great potential. Compared with land drilling, the formation environment of high temperature in deep water and low temperature in tundra makes drilling work face many technical problems. The temperature of deep-water drilling in the Gulf of Mexico, South my country Sea, and West African waters can be as high as 200°C. Drilling work in Xinjiang, Qinghai, Tibet, Heilongjiang and other places is often carried out in an ultra-low temperature environment. This requires the drilling fluid to be able to operate over a wide temperature range. [0003] At home and abroad, the research on drilling fluids for low-temperature formations in deep water and permafrost zones is very limited, and most ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/03C09K8/36
CPCC09K8/032C09K8/36
Inventor 孙强赵春花耿铁王伟樊哲罗健生苗海龙刘刚李超孙德军张厉
Owner CHINA NAT OFFSHORE OIL CORP
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