Macromolecular coated scale inhibitor for oil field and preparation method thereof

[0037] Example 1

[0038] A method for preparing a polymer film-coated scale inhibitor for oilfields includes the following steps:

[0039] Step (1), according to parts by weight, weigh out 0.02 parts of Polyporus umbellatus extract, 0.1 part of artemisinin, 13 parts of citric acid, 5 parts of sorbitol, 2 parts of 2-(diethanolamino)ethanesulfonic acid, 0.5 part of sulfosuccinate, 0.1 part of dehydroabietic acid, 10 parts of ethanol, 68 parts of water;

[0040] In step (2), the polyporus umbellatus extract, artemisinin and sulfosuccinate weighed in step (1) are added to ethanol and mixed uniformly to obtain mixed liquid A;

[0041] Step (3), add the citric acid, sorbitol, 2-(diethanolamino)ethanesulfonic acid and dehydroabietic acid weighed in step (1) to the water, and then heat to 40°C, then add step (2) ) The obtained mixture A is stirred at a speed of 50r / min until the mixture is uniform, and the mixture B is obtained;

[0042] Step (4), soak the porous chitosan microspheres in the

[0046] Example 2

[0047] A method for preparing a polymer film-coated scale inhibitor for oilfields includes the following steps:

[0048] Step (1), in terms of parts by weight, weigh out 0.04 parts of Polyporus umbellatus extract, 0.2 parts of artemisinin, 18 parts of citric acid, 10 parts of sorbitol, 5 parts of 2-(diethanolamino)ethanesulfonic acid, 0.8 parts of sulfosuccinate, 0.3 parts of dehydroabietic acid, 15 parts of ethanol, 83 parts of water;

[0049] In step (2), the polyporus umbellatus extract, artemisinin and sulfosuccinate weighed in step (1) are added to ethanol and mixed uniformly to obtain mixed liquid A;

[0050] In step (3), the citric acid, sorbitol, 2-(diethanolamino)ethanesulfonic acid and dehydroabietic acid weighed in step (1) are added to water, and then heated to 45°C, then added to step (2) 1) The obtained mixture A is stirred at a speed of 80r / min until the mixture is uniform, and the mixture B is obtained;

[0051] Step (4), soak the porous chitosan micr

[0055] Example 3

[0056] A method for preparing a polymer film-coated scale inhibitor for oilfields includes the following steps:

[0057] Step (1), weigh out 0.034 parts of Polyporus umbellatus extract, 0.14 parts of artemisinin, 15 parts of citric acid, 6 parts of sorbitol, 4 parts of 2-(diethanolamino)ethanesulfonic acid, 0.7 parts of sulfosuccinate, 0.22 parts of dehydroabietic acid, 13 parts of ethanol, 77 parts of water;

[0058] In step (2), the polyporus umbellatus extract, artemisinin and sulfosuccinate weighed in step (1) are added to ethanol and mixed uniformly to obtain mixed liquid A;

[0059] Step (3), add the citric acid, sorbitol, 2-(diethanolamino)ethanesulfonic acid and dehydroabietic acid weighed in step (1) to water, and then heat to 42°C, then add step (2) 1) The obtained mixture A is stirred at a speed of 60r / min until the mixture is uniform, and the mixture B is obtained;

[0060] Step (4), soak the porous chitosan microspheres in the mixed solution B, and after