Channel blocking agent utilizing stratum residual polymer, and channel blocking method
A sealing agent and polymer technology, which is applied in the direction of sealing/isolation, drilling compositions, chemical instruments and methods, etc., can solve problems such as channeling in production wells and insufficient strength of residual polymers in formations, etc., and achieve Good plugging effect, simple operation, and simple preparation method
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[0032] Example 1
[0033] This embodiment provides a channeling sealant using formation residual polymer, which includes a first composition, a second composition and a third composition, wherein:
[0034] In terms of weight percentage, the first composition includes: urotropine 0.4%, resorcinol 0.08%, and the balance is 16 pieces of injection water (salinity 2200mg / L);
[0035] In terms of weight percentage, the second composition includes: 0.4% urea, 0.1% ammonium persulfate, 4.0% hydroxymethyl starch, and the balance is 16 pieces of injection water (salinity 2200mg / L);
[0036] According to weight percentage, the third composition includes: 0.1% N,N-methylenebisacrylamide, the balance is 16 pieces of injection water (salinity 2200mg / L);
[0037] In addition, the volume ratio of the first composition, the second composition, and the third composition is 4:1:1.
[0038] The respective compositions of the above-mentioned channeling agent provided in this embodiment are obtained by unifor...
Example Embodiment
[0051] Example 2
[0052] This embodiment provides a channeling sealant using formation residual polymer, which includes a first composition, a second composition and a third composition, wherein:
[0053] In terms of weight percentage, the first composition includes: urotropine 0.3%, resorcinol 0.05%, and the balance is 16 pieces of injection water (salinity 2200mg / L);
[0054] In terms of weight percentage, the second composition includes: 0.3% urea, 0.08% ammonium persulfate, 3.0% hydroxymethyl starch, and the balance is 16 pieces of injection water (salinity 2200mg / L);
[0055] By weight percentage, the third composition includes: N,N-methylenebisacrylamide 0.08%, the balance is 16 pieces of injection water (salinity 2200mg / L);
[0056] In addition, the volume ratio of the first composition, the second composition, and the third composition is 4:1.5:1.
[0057] The respective compositions of the above-mentioned channeling agent provided in this embodiment are obtained by uniformly mi...
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