Water-based drilling fluid and preparation method thereof

A water-based drilling fluid and water-based fluid technology, applied in the field of drilling fluid, can solve the problems of low passing rate and achieve the effects of strong antibacterial ability, excellent rheological properties and low activity of the system

Active Publication Date: 2020-02-28
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, most drilling fluid systems have a low pass rate of on-site sampling and environmental protection testing, and the additives in drilling fluids cannot completely pass the environmental protection LC 50 detection

Method used

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  • Water-based drilling fluid and preparation method thereof
  • Water-based drilling fluid and preparation method thereof

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preparation example Construction

[0076] In addition, the preparation method of the above-mentioned water-based drilling fluid includes the following steps:

[0077] 1) maintaining the pH of the system at 8-10 after mixing the alkalinity regulator with the water-based liquid;

[0078] 2) Add other components of the water-based drilling fluid and mix to obtain the water-based drilling fluid.

[0079] In addition, the above-mentioned water-based drilling fluid system or the water-based drilling fluid system prepared by the above-mentioned method is used for operations in sea areas with strict environmental protection requirements.

[0080] In the embodiment of the present invention, the anhydrous sodium carbonate and sodium hydroxide are purchased from Sinopharm Group, analytically pure, 500g;

[0081] In the embodiment of the present invention, the environmental-friendly fluid loss control agent is carboxymethyl modified starch, purchased from Beijing Zhongke Risheng Chemical Auxiliary Company, model: PF-BIOFL...

Embodiment 1

[0094] Preparation of water-based drilling fluid: Measure 400ml of seawater with a measuring cylinder and place it in the slurry cup. Add 0.8g of anhydrous sodium carbonate, 0.8g of sodium hydroxide, and 8g of environmentally friendly fluid loss reducer in turn while stirring at a speed of 11,000r / min. , 1.6g environment-friendly low molecular weight coating agent, 1.2g environment-friendly cutting agent, 12g environment-friendly inhibitor, 8g environment-friendly blocking agent, 48g sodium chloride, barite weighted to 1.2g / cm 3 .

Embodiment 2

[0099] The method of Example 1 was used to prepare water-based deepwater water-based drilling fluid, except that the amount of sodium chloride was increased to 80g.

[0100] Preparation of water-based drilling fluid: Measure 400ml of seawater with a measuring cylinder and place it in the slurry cup. Add 0.8g of anhydrous sodium carbonate, 0.8g of sodium hydroxide, and 8g of environmentally friendly fluid loss reducer while stirring at a speed of 11,000r / min. agent, 1.6g environment-friendly low molecular weight coating agent, 1.2g environment-friendly cutting agent, 12g environment-friendly inhibitor, 8g environment-friendly blocking agent, 80g sodium chloride, barite weighted to 1.2g / cm 3 .

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Abstract

The invention discloses a water-based drilling fluid and a preparation method thereof, wherein the water-based drilling fluid comprises the following components: 100 parts by weight of a water-based liquid, 0.3-0.4 part by weight of an alkalinity regulator, 1-3 parts by weight of an environment-friendly filtrate loss reducer, 0.3-0.4 part by weight of an environment-friendly low-molecular-weight coating agent, 0.2-0.4 part by weight of an environment-friendly shear strength improving agent, 3-4 parts by weight of an environment-friendly inhibitor, 2-5 parts by weight of an environment-friendlyplugging agent and 0-12 parts by weight of sodium chloride. The preparation method comprises the following steps: mixing the alkalinity regulator and the water-based liquid, and maintaining the pH value of the system at 8-10; and adding other components of the water-based drilling fluid, and mixing to obtain the water-based drilling fluid. According to the invention, the prepared drilling fluid system is excellent in rheological property, has the environment-friendly nano-scale plugging material, and can improve the pressure-bearing plugging capacity of the system.

Description

technical field [0001] This article relates to drilling fluid technology, which is a water-based drilling fluid and its preparation method, especially a water-based drilling fluid system suitable for sea areas with strict environmental protection requirements, its preparation method and application. Background technique [0002] my country has attached great importance to marine environmental protection for a long time. On August 23, 1982, the "Marine Environmental Protection Law of the People's Republic of China" was promulgated. According to this law, the "Offshore Oil Exploration and Development Environmental Protection Law", "Offshore Oil Exploration and Development Environmental Protection Management Regulations", "Offshore Oil Exploration Implementing Measures for the Development of Environmental Protection Management Regulations. Strict environmental protection laws and regulations and drilling waste discharge standards have put forward very high environmental protec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/24C09K8/035
CPCC09K8/24C09K8/035C09K2208/12
Inventor 耿铁郭磊苗海龙赖全勇张道明陈强张鹏雷志永丁玉
Owner CHINA NAT OFFSHORE OIL CORP
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