Drillable gel plug for underbalanced drilling and preparation method thereof
An underbalanced drilling and gel technology, which is applied in the field of petrochemical industry, can solve the problems of poor well wall bonding, easy gas channeling, downhole accidents, etc., and achieve the effect of simple preparation method and good effect
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Embodiment 1
[0021] A drillable gel plug for underbalanced drilling, its components and mass percentages are:
[0022] Acrylamide: 4%
[0023] N,N'-methylenebisacrylamide: 0.1%
[0024] Polyacrylamide: 0.05%
[0025] Di-tert-butyl peroxide: 0.12%
[0026] Kerosene: 1%
[0027] Emulsifier OP-10: 0.05%
[0028] Emulsion initiator water: 3%
[0029] Gel brittle modifier: 3%
[0030] Potassium ferricyanide: 0.2‰
[0032] Water: balance.
Embodiment 2
[0034] A drillable gel plug for underbalanced drilling, its components and mass percentages are:
[0035] Acrylamide / acrylic acid 4:1 mixture: 8%
[0036] N,N'-methylenebisacrylamide: 0.17%
[0037] Guar gum: 0.5%
[0038] Dicumyl peroxide: 0.1%
[0039] Kerosene: 1.5%
[0040] Emulsifier sodium lauryl sulfate: 0.15%
[0041] Emulsion initiator water: 3%
[0042] Gel brittle modifier: 5%
[0043] Potassium nitrosoferricyanide: 0.4‰
[0044] Barite: 7%
[0045] Water: balance.
Embodiment 3
[0047] A drillable gel plug for underbalanced drilling, its components and mass percentages are:
[0048] Acrylamide / 2-acrylamide-2-methylpropanesulfonic acid 4:1 mixture: 11%
[0049] N,N'-methylenebisacrylamide: 0.08%
[0050] Hydroxypropyl guar gum: 0.3%
[0051] Di-tert-butyl peroxide: 0.2%
[0052] Kerosene: 2%
[0053] Emulsifier sodium dodecyl sulfate: 0.07%
[0054] Emulsion initiator water: 5%
[0055] Gel brittle modifier: 7%
[0056] Potassium ferricyanide: 0.2‰
[0058] Water: balance.
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