Preparation method of composite biological weak gel plugging agent
A technology of water shutoff agent and weak gel, which is applied in the field of preparation of composite biological weak gel water shutoff agent, can solve problems such as inability to unblock recovery, unfavorable downhole operation of water shutoff agent, and irreversible misplugging of oil layers, etc., to achieve saving The effect of job time and cost
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[0030] Example 1
[0031] Weigh 25kg of xanthan gum, 2kg of chromium acetate, 11kg of 36% formaldehyde, and 6kg of sodium thiosulfate, then mix the weighed substance with 10,000kg of water at 30°C and stir evenly to make agent A, and then put it in Seal the barrel and store in a cool place for later use;
[0032] Weigh 10 kg of polyacrylamide, 1.2 kg of aluminum citrate, 0.8 kg of sodium sulfite, 100 kg of sodium silicate with a modulus greater than 3 and a content of 30% sodium silicate, then mix all the weighed substances with 10000 kg of water and stir evenly to prepare agent B. Then put it in a plastic bucket and seal it and store it in a cool place for later use;
[0033] The A and B agents are weighed in a mass ratio of 1:1, and then all the weighed A and B agents are mixed uniformly to obtain the water shutoff agent of the present invention.
Example Embodiment
[0034] Example 2
[0035] Weigh 30 kg of xanthan gum, 2.2 kg of potassium dichromate, 11.5 kg of formaldehyde with a concentration of more than 36%, and 5 kg of sodium thiosulfate, then mix the weighed substance with 10,000 kg of water at 30°C and stir to make agent A , Then put it in a plastic bucket, seal it, and store it in a cool place for later use;
[0036] Weigh 15 kg of polyacrylamide, 1 kg of aluminum citrate, 1 kg of sodium thiosulfate, 128 kg of sodium silicate with a modulus greater than 3 and a content of 30%, and then mix all the weighed substances with 10,000 kg of water and stir evenly to make B Then put it in a plastic bucket, seal it, and store it in a cool place for later use;
[0037] The A and B agents are weighed according to the mass ratio of 1:1, and then all the weighed A and B agents are mixed uniformly to complete the preparation of the water shutoff agent of the present invention.
Example Embodiment
[0038] Example 3
[0039] Weigh 50 kg of xanthan gum, 2.3 kg of potassium dichromate, 12 kg of formaldehyde with a concentration greater than 36%, and 7 kg of sodium sulfite, and then mix the weighed substance with 10,000 kg of water at 30° C. and stir uniformly to prepare agent A. Then put it in a plastic bucket and seal it and store it in a cool place for later use;
[0040] Weigh 20 kg of polyacrylamide, 0.8 kg of aluminum citrate, 1.2 kg of sodium sulfite, 150 kg of sodium silicate with a modulus greater than 3 and a content of 30%, and then mix all the weighed substances with 10,000 kg of water and stir evenly to prepare agent B , Then put it in a plastic bucket, seal it, and store it in a cool place for later use;
[0041] The A and B agents are weighed according to the mass ratio of 1:1, and then all the weighed A and B agents are mixed uniformly to complete the preparation of the water shutoff agent of the present invention.
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