Preparation method of fluid loss additive for oil-well cement
The technology of fluid loss reducer and oil well cement is applied in the field of deep well oil drilling fluid, which can solve the problems of complicated operation, sedimentation, dehydration and the like, and achieves the effects of high feasibility, improved grafting rate and simple method.
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Embodiment 1
[0016] Embodiment 1: a kind of preparation method of oil well cement fluid loss reducer, comprises the following steps:
[0017] (1) Weigh 2g of lignin and dissolve it in deionized water, add redox initiator ferrous ammonium sulfate and hydrogen peroxide, the concentration of ferrous ammonium sulfate is 0.64×10 -4 mol / g, feed nitrogen, and initiate at 50°C for 15 minutes;
[0018] (2) Take two kinds of anionic monomers of acrylic acid and sodium p-vinylbenzenesulfonate in a ratio of 4:1, dissolve them in water and adjust the pH to 6, add potassium persulfate as an initiator, and the concentration of potassium persulfate is 1.85 ×10 -5 mol / g, feed nitrogen, and initiate at 50°C for 15 minutes;
[0019] (3) Mix the initiated lignin monomer and two kinds of anionic monomers together, add aluminum citrate cross-linking agent and continuously feed nitrogen gas, heat up to 55° C., react for 4 hours under continuous stirring environment, and carry out inoculation Branch modificati...
Embodiment 2
[0026] Embodiment 2: a kind of preparation method of oil well cement fluid loss reducer, comprises the following steps:
[0027] (1) Weigh 5g of lignin and dissolve it in deionized water, add redox initiator ferrous ammonium sulfate and hydrogen peroxide, the concentration of ferrous ammonium sulfate is 2.56×10 -4 mol / g, feed nitrogen, and initiate at 50°C for 30 minutes;
[0028] (2) Take two kinds of anionic monomers of acrylic acid and sodium p-vinylbenzenesulfonate in a ratio of 4:3, dissolve them in water and adjust the pH to 7, add potassium persulfate as an initiator, and the concentration of potassium persulfate is 7.40 ×10 -5 mol / g, feed nitrogen, and initiate at 50°C for 20 minutes;
[0029] (3) Mix the initiated lignin monomer and two kinds of anionic monomers together, add aluminum citrate cross-linking agent and continuously feed nitrogen gas, raise the temperature to 65° C., react for 6 hours under continuous stirring environment, and carry out inoculation Bra...
Embodiment 3
[0036] Embodiment 3: a kind of preparation method of oil well cement fluid loss reducer, comprises the following steps:
[0037] (1) Weigh 3g of lignin and dissolve it in deionized water, add redox initiator ferrous ammonium sulfate and hydrogen peroxide, the concentration of ferrous ammonium sulfate is 1.92×10 -4 mol / g, feed nitrogen, and initiate at 50°C for 20 minutes;
[0038] (2) Take two kinds of anionic monomers of acrylic acid and sodium p-vinylbenzenesulfonate in a ratio of 4:2, dissolve them in water and adjust the pH to 7, add potassium persulfate as an initiator, and the concentration of potassium persulfate is 3.70 ×10 -5 mol / g, feed nitrogen, and initiate at 50°C for 18 minutes;
[0039] (3) Mix the initiated lignin monomer and two kinds of anionic monomers together, add aluminum citrate cross-linking agent and continuously feed nitrogen gas, raise the temperature to 60° C., react for 5 hours under continuous stirring environment, and carry out inoculation Bra...
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