Plugging agent suitable for water shut-off and profile control of low-temperature high-salinity oil reservoir
A technology for water plugging, profile control and plugging agent, which is applied to drilling compositions, chemical instruments and methods, etc., can solve the problems of unsuitable low-temperature oil reservoirs, unusable low-temperature oil reservoirs, poor gel formation effect, etc. The freezing time is controllable, the freezing intensity is adjustable, and the effect of improving the sweep coefficient
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Embodiment 1
[0030] A plugging agent suitable for water shutoff and profile control in low-temperature and high-salt reservoirs, composed of: 5.00% acrylamide, 0.50% N,N-methylenebisacrylamide, 0.40% ammonium persulfate, ferricyanide Sodium 0.10% and Water 94.00%. The mass of each component is:
[0031] Acrylamide 5.00g;
[0032] N,N-methylenebisacrylamide 0.50g;
[0033] Ammonium persulfate 0.40g;
[0034] Sodium ferricyanide 0.10g;
[0035] Water 94.00g.
[0036] Its preparation method is as follows:
[0037] (1) Take 94.00g of water, add 5.00g of acrylamide into the water while stirring, and keep stirring for 1-2 hours to obtain an acrylamide solution;
[0038] (2), then slowly add 0.50 g of N,N-methylenebisacrylamide, 0.40 g of ammonium persulfate and 0.10 g of sodium ferricyanide while stirring, and continue stirring for 0.5 h to obtain a blocking agent gel;
[0039] (3), the blocking agent gelling solution is placed in a plurality of ampoules, after being sintered and sealed w...
Embodiment 2
[0045] A plugging agent suitable for water shutoff and profile control in low-temperature and high-salt reservoirs. The mass percent composition is: acrylamide 6.00%, N,N-methylenebisacrylamide 0.60%, ammonium persulfate 0.50%, ferricyanide Sodium 0.08% and Water 92.82%. The mass of each component is:
[0046] Acrylamide 6.00g;
[0047] N,N-methylenebisacrylamide 0.60g;
[0048]Ammonium persulfate 0.50g;
[0049] Sodium ferricyanide 0.08g;
[0050] Water 92.82g.
[0051] Its preparation method is as follows:
[0052] (1) Take 92.82g of water, add 6.00g of acrylamide into the water while stirring, and keep stirring for 1-2 hours to obtain an acrylamide solution;
[0053] (2), then slowly add 0.60g of N,N-methylenebisacrylamide, 0.50g of ammonium persulfate and 0.08g of sodium ferricyanide while stirring, and continue stirring for 0.5h to obtain a blocking agent gel;
[0054] (3), the blocking agent gelling solution is placed in a plurality of ampoules, after being sinter...
Embodiment 3
[0060] A plugging agent suitable for water shutoff and profile control in low-temperature and high-salt reservoirs. The mass percent composition is: acrylamide 7.00%, N,N-methylenebisacrylamide 0.70%, ammonium persulfate 0.60%, ferricyanide Sodium 0.06% and Water 91.64%. The mass of each component is:
[0061] Acrylamide 7.00g;
[0062] N,N-methylenebisacrylamide 0.70g;
[0063] Ammonium persulfate 0.60g;
[0064] Sodium ferricyanide 0.06g;
[0065] Water 91.64g.
[0066] Its preparation method is as follows:
[0067] (1) Take 91.64g of water, add 7.00g of acrylamide into the water while stirring, and keep stirring for 1-2 hours to obtain an acrylamide solution;
[0068] (2), then slowly add 0.70g of N,N-methylenebisacrylamide, 0.60g of ammonium persulfate and 0.06g of sodium ferricyanide while stirring, and continue stirring for 0.5h to obtain a blocking agent gel;
[0069] (3), the blocking agent gelling solution is placed in a plurality of ampoules, after being sinte...
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