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Low-temperature resistant nanometer paraffin emulsion and preparation method thereof

A paraffin emulsion, low temperature resistant technology, applied in the field of oil drilling, can solve problems such as non-normal application

Inactive Publication Date: 2014-08-13
CNPC BOHAI DRILLING ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as an anti-slump lubricant, nano-paraffin emulsion is easy to precipitate paraffin and condense into a solid state when the temperature is low. After the temperature rises, it can no longer be transformed into a liquid state, which makes it unable to be used normally. This problem is especially during the drilling and construction of oilfields in winter. common

Method used

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  • Low-temperature resistant nanometer paraffin emulsion and preparation method thereof
  • Low-temperature resistant nanometer paraffin emulsion and preparation method thereof
  • Low-temperature resistant nanometer paraffin emulsion and preparation method thereof

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Embodiment 1

[0020] The weight percent composition of each raw material: 20% of paraffin wax; 8% of mixed emulsifiers, including two kinds of nonionic surfactants: 4.5% of Tween60 and 3.5% of Span60; potassium chloride 1%; propylene glycol 8%, and the balance is water.

[0021] Specific steps:

[0022] (1) paraffin, nonionic surfactant Tween60 and Span60 are mixed homogeneously in the reactor;

[0023] (2) Add potassium chloride into the reactor after dissolving it in water, and gradually increase the temperature from room temperature to 85° C. within 25 minutes, and the whole heating process is carried out under stirring conditions of 50 to 300 rpm;

[0024] (3) Keep the temperature after heating up, and continue to stir and emulsify at 50-300rpm for 35 minutes;

[0025] (4) Rapidly cool down the obtained mixed system to room temperature with a cold water bath, add propylene glycol, and continue stirring and mixing at 50-300 rpm for 40 minutes to obtain a low-temperature resistant nano-...

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Abstract

The invention discloses a low-temperature resistant nanometer paraffin emulsion which is prepared in a manner of inverted-phase emulsification. Raw materials of the nanometer paraffin emulsion comprise, by weight, 20-50% of solid paraffin, 8% of an emulsifier, 1-3% of potassium chloride, 8-15% of propylene glycol and the balance water. The invention also provides a preparation method of the nanometer paraffin emulsion. The low-temperature resistant nanometer paraffin emulsion has a median particle size being 200-400 nm and a condensation point ranging from -20 DEG C to -9 DEG C. Compared with a conventional nanometer paraffin emulsion, the nanometer paraffin emulsion is good in stability and outstanding in antifreeze performance. The nanometer paraffin emulsion, added to a drilling fluid as an anti-sloughing lubricant, can satisfy a requirement of oil field drilling construction in severe cold weather or a low temperature environment.

Description

Technical field: [0001] The invention relates to the field of petroleum drilling, in particular to a low-temperature resistant nano-paraffin emulsion and a preparation method thereof. Background technique: [0002] Nano-paraffin emulsion is an emulsion with a particle size range of submicron (50-500nm) made from paraffin, emulsifiers (usually various surfactants) and water through a suitable emulsification and dispersion process. . When high-quality nano-paraffin emulsion is used as an additive to drilling fluid, it can significantly improve the inhibition and lubricity of drilling fluid, effectively prevent well collapse, increase drilling speed and protect oil and gas layers. In addition, the characteristics of low toxicity and no fluorescence of nano paraffin emulsion also meet the requirements of environmental protection and oil field drilling construction. However, as an anti-slump lubricant, nano-paraffin emulsion is easy to precipitate paraffin and condense into a s...

Claims

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Application Information

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IPC IPC(8): C09K8/03C09K8/575
CPCC09K8/03C09K8/575C09K2208/34
Inventor 代礼杨宫英杰于永新孙亚珍刘大伟张恩平贾利军
Owner CNPC BOHAI DRILLING ENG
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