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
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[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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