The invention relates to a granular
volume expansion profile control agent for oil
recovery and a preparation, and the preparation comprises the following steps: uniformly mixing and stirring 25-40g of 30%
bentonite water solution and 20-35g of 30%
acrylamide water solution, further adding 0.2-0.5g of
sodium sulfate, 0.7-1.2g of
sodium sulfite and 3.0-6.0ml of 40% NaOH water solution, fully mixing, uniformly stirring, reacting for 15-30 minutes at
room temperature, further rising temperature to 50 DEG C, standing for 3 hours at the constant temperature, and further performing
drying,
granulation, pulverization and screening, thereby preparing the granular
volume expansion profile control agent for oil
recovery.
Polyacrylamide with low degree of
hydrolysis is used as a
raw material main agent, thereby having the characteristics of high
gel strength, good
toughness and effective expansion; and
phenols and
organic acid are selected as gel combination agents, thereby having the characteristics of stable gel combination, no gel breaking, no
hydrolysis,
salt resistance and
biodegradation resistance. The granular
volume expansion profile control agent for oil
recovery adopts a formula
system which combines the granular volume expansion profile control agent and a gel type profile control agent into a whole, thereby having the characteristics of having high volume expansion coefficient and long effective period, and being applicable to crack oil-bearing structures and pore oil-bearing structures.