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Oil-based drilling fluid viscosity reducer as well as preparation method and application thereof

A technology of oil-based drilling fluid and viscosity reducer, which is applied in the field of drilling, can solve the problems of increasing the risk of shale well wall instability, unsatisfactory high temperature resistance, and oil-based drilling fluid demulsification, etc., achieving obvious economy and practicality properties, obvious viscosity-reducing effect, and good wettability

Active Publication Date: 2021-02-12
中石化石油工程技术服务有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the crude oil pour point and viscosity reducer products on the market have poor compatibility with oil-based drilling fluids. After some products are added, the viscosity of crude oil will not decrease but increase; The sharp decline in oil resistance increases the risk of shale wellbore instability
At present, domestic reports on oil-based drilling fluid viscosity reducers are rare, and there are only a few related researches and applications abroad, and the high temperature resistance of oil-based drilling fluid viscosity reducers in foreign markets is not ideal.

Method used

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  • Oil-based drilling fluid viscosity reducer as well as preparation method and application thereof
  • Oil-based drilling fluid viscosity reducer as well as preparation method and application thereof

Examples

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preparation example Construction

[0041] As a further embodiment, the preparation method of gemini cationic surfactant comprises the steps:

[0042] In a three-necked flask equipped with a reflux condenser, add acetonitrile, dioctadecylmethyl tertiary amine, n-hexadecane bromide and hexadecane chloride in the prescribed amount, and pass nitrogen gas for 20-30 minutes to exclude oxygen , to prevent the tertiary amine from being oxidized; stir at 75-85°C for 10-12 hours; then add the formulated amount of isopropanol, ethyl acetate, and toluene to react to obtain a viscous gemini cationic surfactant.

[0043] As a further embodiment, the nonionic surfactant includes the following components by weight:

[0044] 1 part of phenyl alkylbenzenesulfonate, 2 parts of tripolyglycerol monolaurate, 0.5 part of trimethylolpropane trioleate, 2 parts of oleic acid amide.

[0045] As a further embodiment, the solvent oil is No. 3 white oil, No. 5 white oil, d40 solvent oil, No. 70 solvent oil, No. 90 solvent oil, No. 120 solv...

Embodiment 1

[0051] An oil-based drilling fluid viscosity reducer, comprising the following components in parts by weight: 70 parts of solvent naphtha, 20 parts of surfactant, 7 parts of penetrating agent, and 3 parts of stabilizer.

[0052] Surfactants include gemini cationic surfactants and nonionic surfactants, and the mass ratio of gemini cationic surfactants to nonionic surfactants is 1:1.

[0053] Gemini cationic surfactants include the following components by weight: 15 parts of dioctadecylmethyl tertiary amine, 4 parts of n-hexadecane bromide, 1 part of hexadecane chloride, 2 parts of acetonitrile, 1 part of isopropanol parts, 0.5 parts of ethyl acetate, and 5 parts of toluene.

[0054] The preparation method of gemini cationic surfactant comprises the following steps: in a three-necked flask equipped with a reflux condenser, add a formula amount of acetonitrile, dioctadecylmethyl tertiary amine, n-hexadecane bromide and decachloride Hexane, blow nitrogen for 30 minutes, stir at 8...

Embodiment 2

[0063] An oil-based drilling fluid viscosity reducer, comprising the following components in parts by weight: 50 parts of solvent naphtha, 10 parts of surfactant, 1 part of penetrant, and 10 parts of stabilizer.

[0064] Surfactants include gemini cationic surfactants and nonionic surfactants, and the mass ratio of gemini cationic surfactants to nonionic surfactants is 1:1.

[0065] Gemini cationic surfactants include the following components by weight: 15 parts of dioctadecylmethyl tertiary amine, 4 parts of n-hexadecane bromide, 1 part of hexadecane chloride, 2 parts of acetonitrile, 1 part of isopropanol parts, 0.5 parts of ethyl acetate, and 5 parts of toluene.

[0066] The preparation method of gemini cationic surfactant comprises the following steps: in a three-necked flask equipped with a reflux condenser, add a formula amount of acetonitrile, dioctadecylmethyl tertiary amine, n-hexadecane bromide and decachloride Hexane, blow nitrogen for 25 minutes, stir at 85°C for ...

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Abstract

The invention discloses an oil-based drilling fluidviscosity reducer. The viscosity reducer comprises the following components in parts by weight: 50-100 parts of solvent oil, 5-50 parts of a surfactant, 1-20 parts of a penetrating agent and 1-10 parts of a stabilizer. The oil-based drilling fluid viscosity reducer provided by the invention can significantly reduce the viscosity and shearing forceof the oil-based drilling fluid, improve the fluidity of the oil-based drilling fluid, reduce the circulating pump pressure, and realize the cyclic utilization of the oil-based drilling fluid; and the high-temperature resistance is excellent, the cost is low, and the economic value is high. The invention further discloses a preparation method and application of the oil-based drilling fluid viscosity reducer. The preparation method has the advantages of being simple in process, convenient to operate and beneficial to industrial production. The oil-based drilling fluid viscosity reducer is applied to the oil-based drilling fluid, the viscosity reduction rate can be effectively increased, and the circulating pump pressure is reduced.

Description

technical field [0001] The invention relates to the field of drilling, in particular to an oil-based drilling fluid viscosity reducer and its preparation method and application. Background technique [0002] Oil-based drilling fluid has the characteristics of strong inhibition, good lubricating performance, strong anti-pollution ability, and good thermal stability. be widely used. In the process of shale gas development, in order to reduce costs and meet environmental protection requirements, oil-based drilling fluids are reused many times. In the process of oil-based drilling fluid reuse, as the density and solid phase content of oil-based drilling fluid increase, the fluidity of oil-based drilling fluid becomes worse, the circulation pressure loss increases, and the pump pressure increases. The pump pressure can sometimes be as high as 28MPa. Under the influence of high pump pressure, the power of the machine will deteriorate and the energy consumption will increase. In...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C09K8/32
CPCC09K8/035C09K8/32
Inventor 梁文利彭小平梅露强朱宝忠林子旸代一钦杨海平
Owner 中石化石油工程技术服务有限公司
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