Preparation method of modified lignin-based drilling fluid viscosity reducer
A lignin-based, drilling fluid technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of poor universality, poor viscosity reduction effect, and narrow application range, and achieves good viscosity reduction effect and low cost. Low and simple preparation steps
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[0015] Example 1
[0016] First, weigh 180g of ferrous sulfate heptahydrate, add 400mL of 10% hydrochloric acid solution with mass concentration, stir at a rate of 400r / min until the solids are dissolved, use a constant flow pump from the bottom of the reaction vessel at a flow rate of 1mL / min, and pass in time For 30 minutes, pass in 20% hydrogen peroxide, and heat the reaction for 2 hours in a constant temperature water bath at 60°C, then cool to room temperature to obtain the displacer; then weigh 120g calcium lignosulfonate into 950mL deionized water, stir and mix well. Then add 120mL of the displacer prepared above, and add tributyl phosphate dropwise to adjust the pH to 6.2, and after reacting for 30 minutes at 60°C in a constant temperature water bath, add 75g of manganese dioxide and oxidize at 72°C in a constant temperature water bath. After reacting for 40 minutes and cooling to 60°C, add 15g of sodium tripolyphosphate to the mixed solution, stir evenly, put the mixed s...
Example Embodiment
[0018] Example 2
[0019] First, weigh 150g of ferrous sulfate heptahydrate, add 300mL of 10% hydrochloric acid solution with mass concentration, stir at a rate of 300r / min until the solid is dissolved, use a constant flow pump from the bottom of the reaction vessel at a flow rate of 1mL / min, and pass in time For 20 minutes, pass in 20% hydrogen peroxide and heat the reaction in a constant temperature water bath at 55°C for 1 hour, and then cool to room temperature to obtain the displacer; then weigh 100g calcium lignosulfonate into 900mL deionized water, stir and mix well. Then add 100mL of the displacer prepared above, and add tributyl phosphate dropwise to adjust its pH to 6.0, and after reacting for 20 minutes in a constant temperature water bath at 55°C, add 70g of manganese dioxide, and oxidize it in a constant temperature water bath at 70°C. After reacting for 30 minutes and cooling to 55°C, add 12g of sodium tripolyphosphate to the mixed solution, stir evenly, put the mix...
Example Embodiment
[0021] Example 3
[0022] First weigh 160g of ferrous sulfate heptahydrate, add 350mL of 10% hydrochloric acid solution with mass concentration, stir at a rate of 350r / min until the solids are dissolved, use a constant flow pump from the bottom of the reaction vessel at a flow rate of 2mL / min, and pass in time For 25 minutes, pass in 20% hydrogen peroxide and heat the reaction in a constant temperature water bath at 57°C for 1 hour, and then cool to room temperature to obtain the displacer; then weigh 110g calcium lignosulfonate into 920mL deionized water, stir and mix well. Then add 110 mL of the displacer prepared above, and add tributyl phosphate dropwise to adjust the pH to 6.1, and after reacting for 25 minutes in a constant temperature water bath at 56°C, add 72 g of manganese dioxide and oxidize it in a constant temperature water bath at 71°C. After reacting for 35 minutes and cooling to 57°C, add 13g of sodium tripolyphosphate to the mixed solution, stir evenly, put the m...
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