| CPC C09K 8/54 (2013.01) [C09K 2208/32 (2013.01)] | 2 Claims |
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1. An anti-corrosion and low-heat-conduction annulus protection fluid for a deep-sea oil and gas exploitation, comprising the following raw materials: a polymer solution: 100 parts, a first clear water: 100 parts to 500 parts, a thermally-insulating material: 20 parts, a corrosion inhibitor: 1 part to 7 parts, and xanthan gum: 0.3 parts to 0.5 parts;
wherein a raw material composition of the polymer solution is a mixture solution of a polymer and a second clear water, based on a mass ratio, the polymer: the clear water=1:(22-28);
a raw material composition of the polymer comprises: a third clear water: 100 parts, an acrylamide: 15 parts to 20 parts, 2-acrylamido-2-methylpropanesulfonic acid: 5 parts to 10 parts, a crosslinking agent: 0.1 parts to 0.3 parts, and an initiator: 0.5 parts to 1 part;
the thermally-insulating material is a hollow glass microsphere; and
the corrosion inhibitor is ethylenediamine tetra(methylene phosphonic acid) sodium, wherein the anti-corrosion and low-heat-conduction annulus protection fluid is prepared by a method comprising the following specific steps:
(1) taking 50% to 80% of a mass of the third clear water, adding the acrylamide, the 2-acrylamido-2-methylpropanesulfonic acid, and the crosslinking agent under stirring to obtain a first mixture, and further stirring the first mixture until a resulting solution is transparent to obtain a first solution;
(2) taking a remaining part of the third clear water, adding the initiator under stirring to obtain a second mixture, and further stirring the second mixture until dissolution to obtain a second solution;
(3) adding the second solution dropwise to the first solution under stirring to obtain a third mixture, and allowing the third mixture to stand to obtain the polymer;
(4) mixing the polymer with the second clear water under stirring to obtain the polymer solution;
(5) mixing the polymer solution with the first clear water under stirring to obtain a third solution;
(6) pouring the xanthan gum into the third solution under stirring to obtain a fourth mixture, and further stirring the fourth mixture until complete dissolution to obtain a fourth solution, wherein the fourth solution is a complex mixed solution;
(7) adding the corrosion inhibitor to the fourth solution to obtain a fifth mixture, and thoroughly stirring the fifth mixture to obtain a fifth solution; and
(8) adding the thermally-insulating material to the fifth solution to obtain a sixth mixture, and thoroughly stirring the sixth mixture to obtain the anti-corrosion and low-heat-conduction annulus protection fluid.
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