Temporary plugging agent for well killing and preparation method thereof
A temporary plugging agent and well killing technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of low applicable temperature and high reservoir damage rate, and achieve a wide applicable temperature range and short plugging time. , the effect of high viscosity
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[0067] On the other hand, an embodiment of the present invention provides a method for preparing a temporary plugging agent for well killing, the method is applied to any of the temporary plugging agents mentioned above, and the method includes:
[0068] According to the mass percentage of each component, oil is added into the first reactor, and the first stirrer is stirred at a first preset rotation speed.
[0069] Add dispersant to the first reactor, stir to dissolve evenly, then add cross-linking monomer, stir evenly. Wherein, the cross-linking monomer is vegetable gum.
[0070] Water is added to the second reactor and the second stirrer is stirred at a second preset speed.
[0071] Add polyol, crosslinking agent and gel breaker into the second reactor, stir and dissolve evenly.
[0072] Pour the mixed system in the first reactor into the second reactor, and stir evenly at the third preset rotation speed to obtain the temporary blocking agent.
[0073] The above-mentione...
Embodiment 1
[0080] This embodiment provides a temporary blocking agent, which is prepared by the following method:
[0081] Add 0.5 kg of 5# white oil in 5 liters of reaction kettle A with the first stirrer, open the first stirrer, and the rotating speed is 800 rpm. Add 0.3 kg of Span 80 into reaction kettle A, stir to mix and dissolve evenly. Then add 0.6 kilograms of squash gum in the reaction kettle A, stir and mix evenly, obtain viscous, pasty mixture.
[0082] Add 45.87 kilograms of tap water in 80 liters of reaction kettle B with the second agitator, open the second agitator, and the rotating speed is 300 rpm. Add 1.5 kg of sorbitol, 1.2 kg of sodium tetraborate and 0.03 kg of sodium persulfate into reaction kettle B, stir to mix and dissolve evenly.
[0083] Pour all the mixed system in reactor A into reactor B, and continue stirring at a stirring speed of 300 rpm for 10 minutes to obtain 50 kg of suspension-like temporary plugging agent for killing wells provided in this example...
Embodiment 2
[0085] This embodiment provides a temporary blocking agent, which is prepared by the following method:
[0086]Add 2.4 kg of methyl silicone oil to 10 liters of reactor A with the first stirrer, and turn on the first stirrer at a speed of 900 rpm. Add 0.8 kg of oleic acid in reactor A, stir and mix, and dissolve evenly. Then add 2.4 kilograms of guar gum in reactor A, stir and mix evenly, obtain viscous, pasty mixture.
[0087] Add 37.1 kilograms of tap water in 80 liters of reaction kettle B with the second agitator, open the second agitator, and the rotating speed is 200 rpm. Add 4.5 kg of triethylene glycol, 2.4 kg of sodium tetraborate and 0.4 kg of potassium persulfate into reaction kettle B, stir to mix and dissolve evenly.
[0088] Pour all the mixed system in reactor A into reactor B, and continue stirring at a stirring speed of 200 rpm for 10 minutes to obtain 50 kg of suspension-like temporary plugging agent for killing wells provided in this example.
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