Chemical sand control method for heavy oil thermal recovery
A heavy oil thermal recovery and sand control technology, applied in chemical instruments and methods, production fluids, earthwork drilling, etc., can solve the problems of limited use scope, complex sand control agent formulations, and high raw material costs
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[0029] The preparation method of the consolidated body is as follows: take quartz sand and wood tar chemical sand control agent according to a certain mass ratio, after mixing evenly, transfer to a glass tube with a diameter of 2.5 cm and a length of 7 cm, and compact until the sand surface is even. , put it into an autoclave with an appropriate amount of water, then place the autoclave in a heating furnace at a certain temperature, solidify for a certain period of time, take it out and cool it to room temperature, open the autoclave, and break the glass tube to obtain a consolidated body . Then use a core cutter to cut the consolidated body into a consolidated body sample with a diameter of 2.5±0.1cm and a length of 2.5±0.1cm for measuring its compressive strength and permeability. The mass ratio of the wood tar chemical sand control agent to sand grains is 1:4-9, preferably 1:4-6, the temperature of the heating furnace is 230-400°C, preferably 260-350°C, the consolidation ti...
Embodiment 1
[0032] Prepare 20% sodium hydroxide solution and 30% formaldehyde solution, weigh 10g of wood tar in a 200mL beaker, slowly add 5g of sodium hydroxide solution into the beaker, and stir at the same time until the mixture is uniform, and then mix Slowly add 3.3g of formaldehyde solution with a mass concentration of 30% in the solution to react while stirring to obtain the corresponding reaction product; finally add 15g of tap water to the above reaction product and stir evenly to obtain the wood tar chemical sand control agent A 1 . The whole process was controlled in a constant temperature water bath at 50°C.
Embodiment 2
[0034]Configure a mass concentration of 20% potassium hydroxide solution and 30% paraformaldehyde solution, weigh 10g of wood tar in a 200mL beaker, slowly add 10g of potassium hydroxide solution into the beaker, and stir at the same time until evenly mixed, then Slowly add 6.7g of paraformaldehyde solution with a mass concentration of 30% in the mixed solution for reaction, while stirring to obtain the corresponding reaction product; finally add 23.3g of tap water to the above reaction product, and stir evenly to obtain wood tar chemical sand control Agent A 2 . The whole process was controlled in a constant temperature water bath at 30°C.
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