Expandable self-generated gas foam gel and preparation method and application thereof
A technology of expanding foam and self-gassing, applied in chemical instruments and methods, drilling compositions, etc., can solve the problem of high application cost, and achieve the effects of simple construction, good volume expansion and stability, and good sealing performance.
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[0028] According to the above application of the present invention, the self-generating expandable foam jelly is used for permeability in the range of 200-600×10 -3 μm 2 low temperature formation;
[0053] Four groups of self-generating expandable foam jelly gels were prepared, with PAM concentrations of 0.3%, 0.4%, 0.5%, and 0.6%, respectively, and the cross-linking agent was 0.5% Na 2 Cr 2 O 7 +0.6%Na 2 SO 3 , the heat generating agent is 1mol / L NH 4 Cl+1mol / L NaNO 2 , the pH value is 6.8, and the preparation method is as follows:
[0054] (1) Weigh 0.3g, 0.4g, 0.5g, 0.6g of PAM, respectively, add them to 4 groups of beakers containing 100g of distilled water, and stir until uniform; each group is added with 0.5g Na 2 Cr 2 O 7 and 0.6gNa 2 SO 3 , stir until uniform;
[0055] (2) Weigh 4 groups of NH 4 Cl, NaNO 2 , 5.349gNH per group 4 Cl, 6.900g NaNO 2 , were added to the 4 groups of solutions in step (1), and stirred until uniform;
[0056] (3) A certain a...
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[0067] Example 2: Preparation of self-gassing expandable foam jelly with different cross-linking agent concentrations
[0068] Prepare 4 groups of self-generating expandable foam jelly gel liquid, cross-linking agent (chrome jelly Cr 2 (SO 4 ) 3 Reaction formula such as I, mass ratio Na 2 Cr 2 O 7 : Na 2 SO 3 : Cr 2 (SO 4 ) 3 0.5:0.6:0.6) The concentration is 0.15%, 0.3%, 0.6%, 0.9% respectively, the PAM concentration is 0.6%, and the heat generating agent is 1mol / LNH 4 Cl+1mol / LNaNO 2 , the pH value is 6.8, and the preparation method is as follows:
[0069] Cr 2 O 7 2- +3SO 3 2- +8H + →Cr 2 (SO 4 ) 3 +4H 2 O
[0070] Ⅰ
[0071] (1) Weigh 4 groups of PAM, each group of PAM is 0.6g, respectively add it to 4 groups of beakers containing 100g of distilled water, and stir until uniform; 4 groups of Na are weighed in proportion 2 Cr 2 O 7 , Na 2 SO 3 , respectively added to the above 4 groups of PAM solutions, stirred until uniform, the crosslinking agen...
Example Embodiment
[0079] Example 3: Preparation of self-generating expandable foam jelly with different heat generating agent concentrations
[0080] Four groups of self-generating expandable foam jelly gelling liquids were prepared. The concentration of heat generating agent was 0.5mol / L, 1mol / L, 1.5mol / L, 2mol / L, the concentration of PAM was 0.6%, and the concentration of cross-linking agent was 0.5%. Na 2 Cr 2 O 7 +0.6%Na 2 SO 3 , the pH value is 6.8, and the preparation method is as follows:
[0081] (1) Weigh 4 groups of PAM, each group of PAM is 0.6g, respectively add it to 4 groups of beakers containing 100g of distilled water, and stir until uniform; each group is added with 0.5g Na 2 Cr 2 O 7 and 0.6gNa 2 SO 3 , stir until uniform;
[0082] (2) Weigh 4 groups of NH in proportion 4 Cl, NaNO 2 , respectively add to the 4 groups of solutions in step (1), stir evenly, and the concentrations of the heat generating agent in the 4 groups of solutions are respectively 0.5mol / L, 1mo...
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