Nano-micron self-soluble temporary plugging steering agent for acidification
A diverting agent, nano-micron technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as permanent blockage of formations, residues of viscosifier polymers, damage to formation permeability that is difficult to recover, etc., to achieve The effect of formation permeability recovery, simple preparation method and good plugging performance
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[0027] The preparation method of the present invention can be carried out according to the following steps:
[0028] At room temperature, measure 25.0-35.0mL of water and add 0.5-1.5g of iron ion stabilizer, clay stabilizer, drainage aid and high-temperature corrosion inhibitor into it respectively and stir to obtain the mixed solution I;
[0029] Continue to add 0.05-0.15g of dispersant to the mixed solution I and stir, then add 0.1-0.3g of suspending agent and 7.0-20.0g of sodium chloride and stir for 3-10min to obtain mixed solution II;
[0030] Measure 35.0-50.0 mL of concentrated hydrochloric acid, slowly add it into the mixed solution II and keep stirring for 10-30 min to obtain a suspension with precipitated sodium chloride particles.
Embodiment
[0032] This embodiment provides 1-4 examples of soluble salt particles self-turning temporary plugging diversion acidification fluid, which is prepared by the following steps:
[0033] At room temperature, add water first, then add iron ion stabilizer, clay stabilizer, drainage aid, high temperature corrosion inhibitor and stir, then add dispersant, suspending agent and sodium chloride in sequence, and stir for 3 to 10 minutes. When it is completely dissolved, measure concentrated hydrochloric acid and add it for 10-30 minutes while stirring to obtain a suspension with precipitated sodium chloride particles. Wherein, the amount of sodium chloride, concentrated hydrochloric acid and various additives is shown in Table 1 below.
[0034] Table 1 1 to 4 cases of sodium chloride, concentrated hydrochloric acid and the dosage of various additives
[0035] substance
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