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Oil-based drilling fluid without surfactant used as emulsifier

A surfactant-free, oil-based drilling fluid technology, applied in the field of oil-based drilling fluids, can solve problems such as poor stability, and achieve the effects of strong stability, alleviation of damage, and favorable wellbore stability.

Inactive Publication Date: 2014-04-16
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the poor stability of the existing emulsifier using surfactants, to provide an oil-based drilling fluid without surfactants as emulsifiers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] As the best implementation mode of the present invention, the proportion of adding nanomaterials is: 1~5%, based on the total weight of oil-based drilling fluid, the rest is oil phase and water phase, organic soil can also be added as needed, oil-based Losing agents, wetting agents, tackifiers, weighting agents, provided that they do not affect the properties described in this patent; the ratio of oil phase to water is 75:25 to 90:10.

[0019] Raw materials, equipment and sources thereof in this embodiment:

[0020] Oleophilic nano silica particles (30-40nm): Boyu Hi-Tech New Material Technology Co., Ltd.

[0021] Lipophilic nano-calcium carbonate particles (40-60nm): Boyu Hi-Tech New Material Technology Co., Ltd.

[0022] Oleophilic nano-titanium dioxide (20-30nm): Boyu Hi-Tech New Material Technology Co., Ltd.

[0023] Calcium chloride aqueous solution with a mass concentration of 20%: Calcium chloride with a mass of 20% (based on the total weight of the water phase...

Embodiment 2

[0030] As another preferred embodiment of the present invention, its components and proportioning ratio are:

[0031] Oleophilic nano-calcium carbonate particles: 1%, calcium chloride aqueous solution: 15%, diesel oil 84%, after high-speed stirring to form oil-based drilling fluid, the measured demulsification voltage is 630V, and the demulsification voltage is 430V after hot rolling at 80°C . All the other are with embodiment 1.

Embodiment 3

[0033] As another preferred embodiment of the present invention, its components and proportioning ratio are:

[0034] Oleophilic nano-silica particles: 1%, calcium chloride aqueous solution: 15%, diesel oil 84%, after high-speed stirring to form oil-based drilling fluid, the measured demulsification voltage is 2063V, and the demulsification voltage after hot rolling at 80°C is 1527V. All the other are with embodiment 1.

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Abstract

The invention discloses an oil-based drilling fluid without a surfactant used as an emulsifier, which is prepared from the following components according to a proportion: a nano material accounting for 1-5% of the total weight of the oil-based drilling fluid, and the balance of an oil phase and a water phase, wherein the weight ratio of the oil phase to the water phase is 75:25-90:10. The oil-based drilling fluid without the surfactant used as the emulsifier has the characteristics of high temperature resistance and salt resistance, facilitates the stability of a well body, is good in lubricating property and low in degree of damage to an oil-gas layer, has the less toxic effect on a human body as compared with the surfactant, and relieves harm to field operators caused by an oil-based drilling fluid emulsifier.

Description

technical field [0001] The invention relates to an oil-based drilling fluid without surfactant as an emulsifier, which is especially suitable for water-in-oil oil-based drilling fluid, and can be used as a drilling fluid for drilling deep wells, ultra-deep wells, highly inclined directional wells, horizontal wells and complex water-sensitive drilling fluids. An important means of formation. Background technique [0002] Oil-based drilling fluid is a drilling fluid in which oil is the continuous phase. In all oil-based drilling fluids, the water content should not exceed 10%; in water-in-oil drilling fluids, water is evenly dispersed in diesel oil as an essential component, and its water content is generally 10-60%. Since the drilling fluid contains two phases of oil and water, it is necessary to add an emulsifier to the drilling fluid to disperse the water into the oil phase. The emulsification stability of oil-based drilling fluid is an important indicator in its applicat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/34C09K8/36C09K8/03
CPCC09K8/36C09K2208/10
Inventor 罗陶涛刘胜玺陶怀志杨刚袁志平刘伟
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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