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Method for enhancing emulsifying stability of oil-based drilling fluid

An oil-based drilling fluid and emulsification stability technology, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as poor stability, achieve strong emulsion stability, enhance emulsification stability, and reduce processing costs Effect

Active Publication Date: 2014-04-09
BC P INC CHINA NAT PETROLEUM CORP +1
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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 emulsifiers using surfactants and provide a method for enhancing the emulsification stability of oil-based drilling fluids

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] As the best implementation mode of the present invention, the ratio of nanomaterials to emulsifier is: 1:5~0.5, the rest is oil and water, organic soil, oil-based fluid loss reducer, wetting agent, Tackifiers and weighting agents, provided that they do not affect the properties described in this patent;

[0020] Based on the total mass percentage of oil-based drilling fluid, the emulsifier is 1-4%, the nanomaterial is 0.1-5%, and the rest is oil phase and water phase.

[0021] Emulsifier can be used: Span80, calcium oleate, calcium stearate in a single component or a mixture of any ratio; the ratio of oil phase to water is 75:25-90:10.

[0022] Raw materials, equipment and their sources:

[0023] Hydrophilic nano silica particles (30-40nm): Boyu Hi-Tech New Material Technology Co., Ltd.

[0024] Hydrophilic nano calcium carbonate particles (40-60nm): Boyu Hi-Tech New Material Technology Co., Ltd.

[0025] Hydrophilic nano titanium dioxide (20-30nm): Boyu Gaoke New Ma...

Embodiment 2

[0034] As another preferred embodiment of the present invention, its components and proportioning ratio are:

[0035] Emulsifier Span80: 2%, hydrophilic nano-calcium carbonate particles: 0.5%, calcium chloride aqueous solution: 15%, diesel oil 82.5%, and form oil-based drilling fluid after high-speed stirring. The measured demulsification voltage is 245V, and hot roll at 80°C The post-demulsification voltage was determined to be 340V. If no hydrophilic nano-calcium carbonate particles are added, the demulsification voltage of the oil-based drilling fluid with the same other conditions before hot rolling is 143V, and the demulsification voltage after hot rolling is 183V. All the other are with embodiment 1.

Embodiment 3

[0037] As another preferred embodiment of the present invention, its components and proportioning ratio are:

[0038] Emulsifier calcium stearate: 2%, hydrophilic nano-calcium carbonate particles: 0.5%, calcium chloride aqueous solution: 15%, diesel oil 82.5%, form oil-based drilling fluid after high-speed stirring, and the measured demulsification voltage is 155V. The demulsification voltage was determined to be 386V after hot rolling at ℃. If no hydrophilic nano-calcium carbonate particles are added, the demulsification voltage of the oil-based drilling fluid with the same other conditions is 117V before hot rolling, and the demulsification voltage after hot rolling is 125V. All the other are with embodiment 1.

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Abstract

The invention discloses a method for enhancing emulsifying stability of an oil-based drilling fluid. The method comprises the steps: during preparation of the oil-based drilling fluid, after adding an emulsifier, adding a hydrophilic nano-material with the mass of 0.1%-5% of that of the oil-based drilling fluid and with the mass ratio of the nano-material to the emulsifier of 1:5-0.5, stirring uniformly, and then investing to use. The oil-based drilling fluid has the characteristics of high temperature resistance and salt resistance, is conducive to the well wall stability, has good lubricity and small degree of damage to an oil gas bed, has the human body poisonous effect far less than a surfactant, and alleviates the harm of the oil-based drilling fluid emulsifier to on-site operating personnel.

Description

technical field [0001] The invention relates to a method for enhancing the emulsification stability of oil-based drilling fluid, which is especially suitable for water-in-oil oil-based drilling fluid, and can be used as a method for drilling deep wells, ultra-deep wells, highly inclined directional wells, horizontal wells and complex water-sensitive formations. important means. 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 application process. ...

Claims

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Application Information

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IPC IPC(8): C09K8/03C09K8/36
CPCC09K8/03C09K8/36C09K2208/10
Inventor 罗陶涛欧阳伟刘翔王兰王睿李巍
Owner BC P INC CHINA NAT PETROLEUM CORP
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