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High-temperature resistant oil-based drilling fluid and preparation method thereof

An oil-based drilling fluid, high temperature resistant technology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as the inability to meet the needs of ultra-high temperature shale gas wells, and achieve good application effects, stable system performance, and filterability. small loss effect

Inactive Publication Date: 2019-02-15
北京石大胡杨石油科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in order to drill high-temperature ultra-deep wells, high-temperature shale gas wells must have matching ultra-high temperature drilling fluids. The drilling fluids in the above patents have good application effects at 50°C-200°C, but when the ambient temperature reaches 200°C If the above is the case, it will not be able to meet the needs of ultra-high temperature shale gas wells

Method used

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  • High-temperature resistant oil-based drilling fluid and preparation method thereof

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Effect test

Embodiment 1

[0035] A high temperature resistant oil-based drilling fluid, the drilling fluid is composed of water-in-oil base fluid, primary emulsifier, secondary emulsifier, fluid loss reducer, alkalinity regulator, organic soil, wetting agent and weighting agent powder; The water-in-oil base liquid is composed of No. 3 white oil with a volume ratio of 90:10 and a calcium chloride aqueous solution with a concentration of 25%; calculated per 100mL of water-in-oil base liquid, the addition amount of the remaining components is: organic Bentonite 0.5g, PF-MOMUL 1g, PF-MOCOAT 1.4g, PF-MOWET-260 1g, calcium oxide 2g, sulfonated pitch 6g, barite 220g.

[0036] A preparation method for high-temperature resistant oil-based drilling fluid, comprising the following steps:

[0037] A. Measure 270ml No. 3 white oil with a measuring cylinder, pour it into a high-speed mixing cup, add 3g PF-MOMUL, 4.2gPF-MOCOAT, 3g PF-MOWET-260 respectively, and stir for 5 minutes;

[0038] B. adding 30ml concentrati...

Embodiment 2

[0040] A high temperature resistant oil-based drilling fluid, the drilling fluid is composed of water-in-oil base fluid, primary emulsifier, secondary emulsifier, fluid loss reducer, alkalinity regulator, organic soil, wetting agent and weighting agent powder; The water-in-oil base liquid is composed of No. 3 white oil with a volume ratio of 85:15 and a calcium chloride aqueous solution with a concentration of 25%. In terms of per 100mL of water-in-oil base liquid, the addition amount of the remaining components is: organic Bentonite 1g, PF-MOMUL 1.5g, PF-MOCOAT 1.5g, PF-MOWET-260 1.5g, calcium oxide 1.5g, modified asphalt 5g, barite 210g.

[0041] A preparation method for high-temperature resistant oil-based drilling fluid, comprising the following steps:

[0042] A. Measure 255ml No. 3 white oil with a measuring cylinder, pour it into a high-speed mixing cup, add 4.5gPF-MOMUL, 4.5gPF-MOCOAT, 4.5gPF-MOWET-260 respectively, and stir for 4min;

[0043] B. adding 45ml concentra...

Embodiment 3

[0045] A high temperature resistant oil-based drilling fluid, the drilling fluid is composed of water-in-oil base fluid, primary emulsifier, secondary emulsifier, fluid loss reducer, alkalinity regulator, organic soil, wetting agent and weighting agent powder; The water-in-oil base liquid is composed of No. 0 diesel oil with a volume ratio of 90:10 and a calcium chloride aqueous solution with a concentration of 20%; calculated per 100 mL of water-in-oil base liquid, the addition amount of the remaining components is: organic Mongolia Destone 2.5g, PF-MOMUL 2g, PF-MOCOAT 2g, PF-MOWET-260 2g, calcium oxide 3g, natural asphalt 7g, iron ore powder 210g.

[0046] A preparation method for high-temperature resistant oil-based drilling fluid, comprising the following steps:

[0047]A. Measure 270ml No. 0 diesel oil with a measuring cylinder, pour it into a high-speed mixing cup, add 6g PF-MOMUL, 6g PF-MOCOAT, 6g PF-MOWET-260 respectively, and stir for 6 minutes;

[0048] B. Add 30ml ...

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Abstract

The invention discloses high-temperature resistant oil-based drilling fluid, wherein the drilling fluid comprises water-in-oil base liquid, a primary emulsifier, a co-emulsifier, a filtrate reducer, an alkalinity adjuster, organic soil, a wetting agent and weighting agent powder; the water-in-oil base liquid comprises base oil and brine in a volume ratio of 65:35-95:5; rest components including 0.5 to 2.5g of the organic soil, 0.5 to 2g of the primary emulsifier, 1 to 2g of the co-emulsifier, 1 to 2g of the wetting agent, 1 to 3g of the alkalinity adjuster, 5 to 8g of the filtrate reducer, and0 to 230g of a weighting agent are added calculated in per 100mL of the water-in-oil base liquid; the drilling fluid prepared with the method is subjected to hot rolling at the temperature of 260 DEGC, system performances are stable, the demulsification voltage is above 1000V, the filtration loss is below 8ml, and the preparation process is simple and convenient to operate.

Description

technical field [0001] The invention belongs to the technical field of petroleum drilling engineering drilling fluid, and in particular relates to a high-temperature-resistant oil-based drilling fluid and a preparation method thereof. Background technique [0002] With the world's increasing demand for oil and natural gas resources and shale gas and the development of drilling technology, deep wells and ultra-deep wells have become the main direction of future drilling technology development. The development of both has also expanded the application range of oil-based drilling fluids. Higher requirements are also put forward for drilling fluid. Oil-based drilling fluid is a drilling fluid with oil as the continuous phase. It is more and more widely used in high-temperature and high-pressure deep wells, horizontal wells, highly deviated directional wells, slimhole drilling, and shale gas drilling. Compared with water-based drilling fluids , oil-based drilling fluid has the a...

Claims

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Application Information

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IPC IPC(8): C09K8/32
CPCC09K8/32
Inventor 徐同台王伟李银素荆鹏杨艳黄献西
Owner 北京石大胡杨石油科技发展有限公司
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