High-temperature-resistant water-based drilling fluid viscosity reducer as well as preparation method and application thereof

A technology of water-based drilling fluid and viscosity reducer, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as difficult adjustment and control, thickening, high-temperature degradation, etc., and achieve poor temperature resistance, Promote the effect of stable performance and high temperature resistance

Active Publication Date: 2016-05-11
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

Under the condition of high temperature and high density, the drilling fluid will thicken due to the degradation of some components, which will cause drastic changes in the performance of the drilling fluid, and it is difficult to adjust and control. In severe cases, the drilling operation will not be able to proceed normally
[0005] Viscosity reducers currently on the market are prone to high-temperature degradation and loss of effect when drilling deep and ultra-deep wells

Method used

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  • High-temperature-resistant water-based drilling fluid viscosity reducer as well as preparation method and application thereof
  • High-temperature-resistant water-based drilling fluid viscosity reducer as well as preparation method and application thereof
  • High-temperature-resistant water-based drilling fluid viscosity reducer as well as preparation method and application thereof

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Effect test

Embodiment 1

[0024] This embodiment provides a high temperature resistant water-based drilling fluid viscosity reducer, which is prepared through the following steps:

[0025] 300 parts by weight of pure water, 28 parts by weight of sodium p-styrene sulfonate, 20 parts by weight of maleic anhydride and 2 parts by weight of allyltrimethylammonium chloride were added successively in a constantly stirring four-necked flask , after dissolving, add sodium hydroxide solution (mass concentration is 30%) to adjust the pH to 7.0;

[0026] Add successively 1.5 parts by weight of thioethanol, 8 parts by weight of sodium thiosulfate solution (mass concentration is 25%), and 16 parts by weight of ammonium persulfate solution (mass concentration is 25%), stir and heat up to 80°C , react at constant temperature for 2 hours, measure the molecular weight of the viscosity reducer to reach 4000-6000, and the reaction is completed;

[0027] Vacuum-dried at 35°C in a vacuum drying oven, and then crushed to 20...

Embodiment 2

[0029] This embodiment provides a high temperature resistant water-based drilling fluid viscosity reducer, which is prepared through the following steps:

[0030] 300 parts by weight of pure water, 35 parts by weight of sodium p-styrene sulfonate, 25 parts by weight of maleic anhydride and 3 parts by weight of allyltrimethylammonium chloride were added successively in a constantly stirring four-necked flask , after dissolving, add sodium hydroxide solution (mass concentration is 30%) to adjust the pH to 7.0;

[0031] Add successively the thioethanol of 2 weight parts, the sodium thiosulfate solution (mass concentration is 25%) of 12 weight parts, the ammonium persulfate solution (mass concentration is 25%) of 18 weight parts, stir, heat up to 80 ℃ , react at constant temperature for 1.5 hours, measure the molecular weight of the viscosity reducer to reach 4000-6000, and the reaction is completed;

[0032] Vacuum-dried at 35°C in a vacuum drying oven, and then crushed to 200 m...

Embodiment 3

[0034] This embodiment provides a high temperature resistant water-based drilling fluid viscosity reducer, which is prepared through the following steps:

[0035] 300 parts by weight of pure water, 25 parts by weight of sodium p-styrene sulfonate, 15 parts by weight of maleic anhydride and 1 part by weight of allyltrimethylammonium chloride were successively added to a constantly stirring four-necked flask , after dissolving, add sodium hydroxide solution (mass concentration is 30%) to adjust the pH to 7.0;

[0036] Add the thioethanol of 1 weight part, the sodium thiosulfate solution (mass concentration is 25%) of 6 weight parts, the ammonium persulfate solution (mass concentration is 25%) of 12 weight parts successively, stir, heat up to 80 ℃ , react at constant temperature for 2 hours, measure the molecular weight of the viscosity reducer to reach 4000-6000, and the reaction is completed;

[0037] Vacuum-dried at 35°C in a vacuum drying oven, and then crushed to 200 mesh t...

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Abstract

The invention provides a high-temperature-resistant water-based drilling fluid viscosity reducer as well as a preparation method and application thereof. The preparation method comprises: sequentially adding 25-35 parts by weight of sodium p-styrene sulfonate, 15-25 parts by weight of maleic anhydride and 1-3 parts by weight of allyl trimethyl ammonium chloride into 300 parts by weight of water, stirring, and adding 20-35 parts by weight of a sodium hydroxide solution to adjust the pH value to 7.0; and adding 1-2 parts by weight of ethyl mercaptan and 6-12 parts by weight of a sodium thiosulfate solution, stirring, adding 12-20 parts by weight of an ammonium persulfate solution, stirring, carrying out a heating reaction, stopping reaction when the molecular weight of a head product is 4000-6000, and carrying out drying and screening to obtain the high-temperature-resistant water-based drilling fluid viscosity reducer. The high-temperature-resistant water-based drilling fluid viscosity reducer provided by the invention is suitable for reducing the viscosity of the water-based drilling fluid of which the density is 1.8-2.6g/cm<3> at a temperature of lower than 220 DEG C, can reduce the viscosity of high-temperature and high-density water-based drilling fluid, and can promote the property of the drilling fluid to be stable.

Description

technical field [0001] The invention relates to a viscosity reducer for high-temperature resistant water-based drilling fluid and a preparation method thereof, belonging to the technical field of exploration and development of petroleum resources in deep wells, ultra-deep wells and extended-displacement horizontal wells. Background technique [0002] With the deepening of my country's oil exploration and development, the exploration and development of deep oil and natural gas has gradually become the main way to solve the problem of stable and increased production of my country's oil industry. Therefore, the drilling of deep wells and ultra-deep wells will become an important aspect of my country's oil industry. [0003] However, the deeper the wellbore, the higher the temperature inside the wellbore due to the presence of geothermal gradients. The bottom hole temperature of ultra-deep wells exceeding 7000m in western oilfields (temperature gradient of 2.5°C / 100m-3.0°C / 100m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F212/14C08F222/08C08F226/02C09K8/035
CPCC08F212/14C09K8/035C08F222/08C08F226/02
Inventor 王茂功杨泽星陈帅
Owner BC P INC CHINA NAT PETROLEUM CORP
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