In-depth profile controlling agent for medium temperature oil deposit three compound combination flooding
A technology of deep profile control and ternary compounding, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of high damage to low-permeability layers, limited scope of application, and difficulty in forming gel systems, etc., and achieves improved sweep Volume, low initial viscosity, and the effect of solving injectability problems
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Embodiment 1
[0036] Under the conditions of simulated water, select partially hydrolyzed polyacrylamide NJ-1 (molecular weight 10 million, degree of hydrolysis 1%) and NJ-2 (molecular weight 20 million, degree of hydrolysis 10%) with different degrees of hydrolysis and molecular weight, respectively configure the mass An aqueous solution of NJ-1 polymer with a concentration of 0.15% and an aqueous solution of NJ-2 polymer with a mass concentration of 0.1%. Then take a part of the above two polymer aqueous solutions respectively, and add sodium hydroxide therein to make the mass concentration of sodium hydroxide 0.2%. Another part of the above-mentioned two polymer aqueous solutions without adding alkali is reserved. Using a Brookfield viscometer at 45°C, 7.34s －1 Measure the initial viscosities of these four solutions under the conditions of 45°C, put the four solutions into an oven at 45°C and measure their viscosity after aging for 1 day, and calculate the viscosity adjustment times bas...
Embodiment 2
[0040] Under the condition of simulating water, configuration mass concentration is the NJ-1 polymer aqueous solution of 0.2%, then adds sodium hydroxide to it and is made into the solution of different sodium hydroxide mass concentrations (0,0.05,0.2,1.0%), then Put the prepared solution in a 45°C oven for aging, take it out after different times (0, 1, 3, 7, 15, 30, 60, 90, 120, 180 days), and use a Brookfield viscometer at 45°C, 7.34s －1 Measure the viscosity of the solution regularly under the conditions, and calculate the viscosity adjustment multiple based on the solution viscosity without adding alkali. The results are as follows: figure 2 shown.
[0041] Depend on figure 2 It can be seen that during the 180-day investigation period, under different sodium hydroxide concentrations, the NJ-1 alkali-resistant polymer can delay the viscosity increase for one month, and realize the adjustment of the viscosity ratio up to 30 times. increase, the viscosity increase ratio ...
Embodiment 3
[0043] Under the condition of simulating water, configure the NJ-1 polymer aqueous solution that mass concentration is 0.2%, then add sodium carbonate to it and be made into the solution of different sodium carbonate mass concentration (0,0.05,0.2,1.0%), then will prepare Put the solution in a 45°C oven for aging, take it out after different times (0, 1, 3, 7, 15, 30, 60, 90, 120, 180 days), and use a Brookfield viscometer at 45°C, 7.34s －1 Measure the viscosity of the solution regularly under the conditions, and calculate the viscosity adjustment multiple based on the solution viscosity without adding alkali. The results are as follows: image 3 shown.
[0044] Depend on image 3 It can be seen that under the condition of sodium carbonate, during the 180-day investigation period, the viscosity ratio of NJ-1 alkali-resistant polymer can be adjusted by 10 times. With the increase of sodium carbonate concentration, the viscosity increase ratio first increases and then decreases...
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