A kind of multifunctional additive for oil-based drilling fluid and preparation method thereof

A technology of oil-based drilling fluid and multi-functional additives, which is applied in the directions of chemical instruments and methods, drilling compositions, etc., can solve the problem of not being able to protect the oil and gas layers during drilling and improving the cementing quality, few commercialized products, and ineffective effects. Satisfactory and other problems, to achieve good filter loss reduction effect, good filter loss reduction, easy to control effect

Inactive Publication Date: 2017-04-12
XI'AN PETROLEUM UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The research on foreign shear agents for oil-based drilling fluids began in the 1970s. Up to now, technological breakthroughs have been made and a number of patents have been applied for. very limited
However, there is no research report on this agent in China at present, only a few studies on synthetic base oil drilling fluid have used shearing agent, and there are few commercial products, and the effect is not satisfactory.
[0005] In addition, the currently used oil-based drilling fluid fluid loss reducers and shear enhancement agents, while reducing the drilling fluid fluid loss and increasing the shear force, also increase the viscosity of the drilling fluid to varying degrees, causing high-temperature viscosity increase and environmental pollution. The problem is that it cannot meet the needs of drilling in complex formations, optimizing drilling, protecting oil and gas layers, and improving cementing quality, and the temperature resistance requirements of drilling fluid treatment agents for drilling operations are getting higher and higher, and the original drilling fluid treatment agents have not been able to fully meet the needs

Method used

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  • A kind of multifunctional additive for oil-based drilling fluid and preparation method thereof
  • A kind of multifunctional additive for oil-based drilling fluid and preparation method thereof
  • A kind of multifunctional additive for oil-based drilling fluid and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0031] Weigh 80g of humic acid and 25g of cocoamide diethanolamine and place it in a 250mL flask, add 50mL of xylene and 3mL of concentrated sulfuric acid (6mol / L), install a water separator and a reflux condenser, and heat the flask with a 90°C water bath (toluene and The azeotrope boiling point of water is 85 ℃), when the amount of water in the water separator no longer increases, that is, when water is no longer generated, stop the reaction (the time is 3-5 hours), remove xylene, wash with 95% ethanol , The resulting product was dried in an oven at 50°C, and crushed into a black powdery solid to obtain a fluid loss reducer for oil-based drilling fluid.

Embodiment 2

[0033] Weigh 105g of humic acid and 15g of cocoamide diethanolamine and place it in a 250mL flask, add 35mL of xylene and 2mL of concentrated sulfuric acid (6mol / L), install a water separator and a reflux condenser, and heat the flask with a 90°C water bath (toluene and The azeotrope boiling point of water is 85 ℃), when the amount of water in the water separator no longer increases, that is, when water is no longer generated, stop the reaction (the time is 3-5 hours), remove xylene, wash with 95% ethanol , The resulting product was dried in an oven at 50°C, and crushed into a black powdery solid to obtain a fluid loss reducer for oil-based drilling fluid.

Embodiment 3

[0035] Weigh 90g of humic acid and 20g of cocoamide diethanolamine (placed in a 250mL flask, add 40mL of xylene and 3mL of concentrated sulfuric acid (6mol / L), install a water separator and a reflux condenser, and heat the flask with a 90°C water bath (toluene The boiling point of the azeotrope with water is 85°C), and when the amount of water in the water separator no longer increases, that is, when water is no longer generated, stop the reaction (the time is 3-5 hours); remove xylene, use 95% ethanol After washing, the obtained product is dried in an oven at 50°C; it is crushed into a black powdery solid to obtain a fluid loss reducer for oil-based drilling fluid.

[0036] The structure of the final product obtained in embodiment 3 has been characterized by infrared spectroscopy, and the spectrogram is shown in figure 1 , the spectrum analysis is as follows:

[0037] figure 1 The frequency in b is 3364cm -1 It is the stretching vibration peak of phenolic hydroxyl group an...

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Abstract

The invention relates to a multifunctional additive for an oil-based drilling fluid and a preparation method of the multifunctional additive. Xylene is adopted as a reaction solvent, concentrated sulfuric acid is adopted as a catalyst, cocoyl diethanolamine is grafted onto humic acid by virtue of esterification reaction and thus the chemical modification of humic acid is achieved, as a result, humic acid molecules have good oil solubility, the modified humic acid molecules contain a large number of acylamino groups RCONR2, ester groups -COOR, -OH, -COOH, -C=O and -O- and other groups, N and O atoms in the groups can form hydrogen bonds with H atoms on other polar groups, interactions occur between the molecules by virtue of the hydrogen bonds and electrostatic attraction and thus a network structure with a large specific surface area is formed and a three-dimensional network structure is formed between the long alkyl straight chains in the molecules by virtue of an association effect. The multifunctional additive product has the advantages of filtration reducing property, increased shearing force, high-temperature resistance, calcium ion resistance and no viscosity increasing and the rheological property of the slurry can be maintained at a good state.

Description

technical field [0001] The invention belongs to the technical field of oilfield drilling aids, and in particular relates to a multifunctional additive for oil-based drilling fluid and a preparation method thereof. [0002] technical background [0003] With the development of modern drilling technology, oil-based drilling fluid has become an important means of drilling in various complex formations due to its excellent properties such as good lubricity, strong inhibition, and little damage to formations. An important performance of oil-based drilling fluid is fluid loss reduction performance. Only when fluid loss is well controlled can the wellbore be stabilized, pressure differential sticking and formation damage can be avoided. Cuttings bed, therefore, shear force is one of the key rheological parameters that determine the performance of oil-based drilling fluids. Due to the single function of drilling fluid fluid loss control agent and shear enhancement agent in the marke...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/035
CPCC09K8/03
Inventor 张群正柯从玉张洵立李长春南叶飞
Owner XI'AN PETROLEUM UNIVERSITY
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