Preparation method of organic-inorganic composite gel water-plugging agent
A technology of composite gel and water blocking agent, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of short gel time, high colloid hardness and brittleness, easy to break, etc., and meet low quality requirements, The effect of low cost and easy operation
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Embodiment 1
[0013] A preparation method of organic-inorganic composite gel water blocking agent, comprising the following steps:
[0014] In the first step, water glass is dissolved in water of 5 times its mass in a reaction vessel at normal temperature, the water glass is water glass with an industrial grade purity modulus of 2, and the water has a salinity of 4×10 4 / mg·L -1 oilfield production water;
[0015] In the second step, adding polysaccharides with a ratio of 1:200 to water glass mass in the reaction vessel under stirring, stirring evenly, the polysaccharides are guar gum of industrial grade purity;
[0016] The third step is to add a mixed solution with a mass concentration of 1% pH regulator and 0.1% stabilizer to the reaction vessel, and stir evenly to obtain the organic-inorganic composite gel precursor. The pH regulator is an industrial-grade Acetic anhydride, described stabilizing agent is technical grade sodium lauryl sulfonate;
[0017] In the fourth step, the organi...
Embodiment 2
[0020] A preparation method of organic-inorganic composite gel water blocking agent, comprising the following steps:
[0021] In the first step, water glass is dissolved in water of 8 times its mass in a reaction vessel at normal temperature, the water glass is water glass with an industrial grade purity modulus of 1.5, and the water has a salinity of 1×10 4 / mg·L -1 oilfield production water;
[0022] In the second step, adding polysaccharides with a ratio of 1:50 to the water glass mass in the reaction vessel under stirring, stirring evenly, the polysaccharides are saponins of industrial grade purity;
[0023] The third step is to add a mixed solution with a mass concentration of 2% pH regulator and 0.2% stabilizer to the reaction vessel, and stir evenly to obtain the organic-inorganic composite gel precursor. The pH regulator is an industrial-grade horse Toic anhydride, the stabilizer is technical grade sodium lauryl sulfate;
[0024] In the fourth step, the organic-inor...
Embodiment 3
[0027] A preparation method of organic-inorganic composite gel water blocking agent, comprising the following steps:
[0028] In the first step, water glass is dissolved in water of 10 times its mass in a reaction vessel at normal temperature. The water glass is water glass with an industrial grade purity modulus of 1.2, and the water has a salinity of 5×10 3 / mg·L -1 well water;
[0029] In the second step, adding polysaccharides with a ratio of 1:100 to the water glass mass in the reaction vessel under stirring, stirring evenly, the polysaccharides are xanthan gums of industrial grade purity;
[0030] The third step is to add a mixed solution with a mass concentration of 5% pH regulator and 0.5% stabilizer to the reaction vessel, and stir evenly to obtain the organic-inorganic composite gel precursor. The pH regulator is chemically pure benzene Formic anhydride, the stabilizer is analytically pure sodium dodecylbenzenesulfonate;
[0031] In the fourth step, the organic-in...
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