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Ultralow-density oil-base drilling fluid and preparation method thereof

An oil-based drilling fluid, ultra-low density technology, applied in the field of oil-based drilling fluid, can solve the problems of poor stability, difficult to adapt to long-term drilling, completion requirements, difficult to prepare, etc., to prevent agglomeration, good emulsion stability, The effect of low temperature and high pressure filter loss

Active Publication Date: 2017-06-13
成都西油华巍科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, ultra-low density oil-based drilling fluid is extremely difficult to prepare and has poor stability, and it is difficult to adapt to the long-term drilling and completion requirements of low-pressure oil and gas wells and low-pressure shale gas wells

Method used

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  • Ultralow-density oil-base drilling fluid and preparation method thereof
  • Ultralow-density oil-base drilling fluid and preparation method thereof
  • Ultralow-density oil-base drilling fluid and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0045]An ultra-low-density oil-based drilling fluid prepared from the following raw material components by weight and percentage:

[0046] Base oil 95.00%; Density reducer 0.00%; Suspension stabilizer 0.00%; Emulsifier 2.00%; Calcium chloride aqueous solution 2.00%; Among them, the base oil is mixed with 3# white oil, 5# white oil, and natural gas oil, and then add a flash point enhancer in the stirring state, and let stand for 1h; stir at a low speed at a temperature of 30°C, Use a mixing funnel for vacuum suction, slowly add oil-soluble gas-phase nano-silica, and add while stirring. The dosage ratio of the silicon and the flash point enhancer is 30:10:60:5:2; wherein, the flash point enhancer is menthol. The emulsifier is long-chain alkyl fatty acid polyamide nonionic surfactant; the tackifier is polyamide resin; the fluid loss reducer is humic acid amide; the alkalinity regulator is magnesium oxide. The mass concentration of the calcium chloride aqueous solution is 20.00%...

Embodiment 2

[0049] An ultra-low-density oil-based drilling fluid prepared from the following raw material components by weight and percentage:

[0050] Base oil 90.00%; Density reducer 0.00%; Suspension stabilizer 0.20%; Emulsifier 3.50%; Calcium chloride aqueous solution 5.00%; Among them, the base oil is mixed with 3# white oil, 5# white oil, and natural gas oil, and then add a flash point enhancer in the stirring state, and let stand for 1h; stir at a low speed at a temperature of 30°C, Use a mixing funnel for vacuum suction, slowly add oil-soluble gas-phase nano-silica, and add while stirring. The dosage ratio of silicon and the flash point raising agent is 40:15:50:10:4; wherein, the flash point raising agent is pinene. The emulsifier is long-chain alkyl quaternary ammonium salt cationic surfactant; the tackifier is organic montmorillonite; the fluid loss reducer is oil-soluble resin; the alkalinity regulator is calcium oxide. The mass concentration of the calcium chloride aqueous ...

Embodiment 3

[0053] An ultra-low-density oil-based drilling fluid prepared from the following raw material components by weight and percentage:

[0054] Base oil 90.00%; Density reducer 5.00%; Suspension stabilizer 0.20%; Emulsifier 3.00%; Calcium chloride aqueous solution 5.00%; Among them, the base oil is mixed with 3# white oil, 5# white oil, and natural gas oil, and then add a flash point enhancer in the stirring state, and let it stand for 0.5h; stir at a low speed at a temperature of 40°C , use a mixing funnel to carry out vacuum suction, slowly add oil-soluble gas-phase nano-silica, add while stirring, and the adding process is controlled within 2 hours, of which 3# white oil, 5# white oil, natural gas to oil, oil-soluble gas-phase nano-silica The dosage ratio of silicon oxide and the flash point enhancer is 35:20:60:6:3; wherein, the flash point enhancer is citral. The density reducer is made by mixing hollow glass microspheres, nano-alumina, and nano-calcium carbonate in a ratio ...

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Abstract

The invention relates to an ultralow-density oil-base drilling fluid. The invention is characterized in that the ultralow-density oil-base drilling fluid is prepared from the following raw materials: base oil, a density reducer, a suspension stabilizer, an emulsifier, a tackifier, a fluid loss additive, a flow pattern regulator, an alkalinity regulator and a calcium chloride water solution. The base mixed oil is prepared by the following steps: mixing 3# white oil, 5# white oil and natural gas prepared oil, adding a flash point enhancer while stirring, and standing for 0.5-1 hour; and stirring at low speed at the temperature of 30-40 DEG C, and slowly adding oil-soluble nano fumed silica while stirring, wherein the addition process is controlled at 2-3 hours. The ultralow-density oil-base drilling fluid has the advantages of favorable emulsifying stability, favorable rheological properties, high inhibition property for mud shale, high emulsion-breaking voltage, low filter loss, low density (0.75-0.90 g / cm<3>), and high sand carrying and pressure bearing capacities, is beneficial to cleaning the borehole and enhancing the mechanical drilling speed, solves the problem of severe lost circulation in the low-pressure formation and long-section shatter zone formation, and is especially suitable for low-pressure oil gas pools and depletion water-sensitive formations.

Description

technical field [0001] The invention relates to oil-based drilling fluid, in particular to an ultra-low density oil-based drilling fluid and a preparation method thereof. Background technique [0002] For the drilling and development of low-pressure oil and gas layers, the ideal drilling fluid is foam drilling fluid, which has a strong ability to remove and carry cuttings. The application of foam drilling fluid in the drilling process can increase the mechanical penetration rate, reduce the number of stuck pipes, and reduce the drill bit. consumption and required power. However, the conventional water-based foam drilling fluid uses the water phase as the continuous medium, relies on the action of the foaming agent, and mixes with air to reduce the density to form foam or micro-bubbles. Due to the high density of the base fluid, the degree of system density reduction is subject to objective conditions. Especially in some low-pressure deep well areas, the stability of drillin...

Claims

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Application Information

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IPC IPC(8): C09K8/36
CPCC09K8/36C09K2208/10
Inventor 肖刚徐兴华宋芳
Owner 成都西油华巍科技有限公司
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