Environmentally-friendly drilling fluid with high plugging performance
A plugging, drilling fluid technology, applied in drilling compositions, chemical instruments and methods, etc., can solve problems such as groundwater pollution, toxic raw materials, etc., and achieve good shale hydration, good thermal stability, filtering Low loss effect
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Embodiment 1
[0028] The invention provides a kind of environment-friendly drilling fluid with strong plugging property, which comprises 2% bentonite, 0.3% sodium carbonate, 0.3% polyamine, 0.2% coating agent, 0.3% xanthan gum, 2% pregelatinized tapioca starch, 2% plugging agent, 1% 600-mesh calcium carbonate, 0.5% castor oil modified lubricant, and 25% barite. quality meter.
[0029] The preparation method of the plugging agent is as follows:
[0030] 1) Dissolve glucose in deionized water to make a glucose solution, then transfer the glucose solution to a tetrafluoroethylene-lined hydrothermal synthesis kettle, react at 160°C for 6 hours, cool to room temperature after the reaction, and centrifugally filter , washed three times with deionized water, and dried to obtain carbon spheres.
[0031] 2) Add sodium metaaluminate solution in a four-neck flask equipped with a mechanical stirrer, then add dilute sulfuric acid to adjust the pH of the solution to be 4, then add urea and cetyltrimeth...
Embodiment 2
[0039] The invention provides a kind of environment-friendly drilling fluid with strong plugging property, including 6% bentonite, 0.5% sodium carbonate, 0.5% polyamino ether, 0.2% coating agent, 0.3% hydroxyethyl cellulose, 0.1% xanthan gum, 8% pregelatinized tapioca starch, 5% plugging agent, 4% 1250 mesh calcium carbonate, 4% castor oil modified lubricant, 200% barite, each component The contents are all mass contents, based on the mass of water.
[0040] The preparation method of described blocking agent is as follows:
[0041] 1) Same as Example 1, except that the hydrothermal reaction conditions are different, and the reaction is carried out at 180° C. for 4 hours.
[0042] 2) Add sodium metaaluminate solution in a four-neck flask equipped with a mechanical stirrer, then add dilute sulfuric acid to adjust the pH of the solution to 4, then add urea and cetyltrimethylammonium bromide to the solution, stir , until the solution is clear, then add the carbon spheres prepare...
Embodiment 3
[0050] The present invention is an environment-friendly drilling fluid with strong plugging properties, including 4% bentonite, 0.4% sodium carbonate, 0.4% polyamine, 0.2% coating agent, 0.2% xanthan gum, 4% pre- Gelatinized tapioca starch, 3% plugging agent, 3% 1500 mesh calcium carbonate, 2% castor oil modified lubricant, 250% barite, the contents of each component are the mass content, calculated by the mass of water
[0051] The preparation method of described blocking agent is as follows:
[0052] 1) Same as Example 1, only the hydrothermal reaction conditions were different, and the reaction was carried out at 170° C. for 5 hours.
[0053] 2) Add sodium metaaluminate solution in a four-neck flask equipped with a mechanical stirrer, then add dilute sulfuric acid to adjust the pH of the solution to be 4, then add urea and cetyltrimethylammonium bromide to the solution, Stir until the solution is clear, then add the carbon spheres prepared in step 1 into a four-neck flask ...
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