Foaming agent composition and purpose thereof

[0025] (1) Add 93g (0.5 mole) dodecyl alcohol and the calcium oxide catalyst of alcohol weight 1% in the reactor that condensing device, stirring device and gas disperser are housed, when heating to 135 ℃ while flowing nitrogen, add 8g water , and stirred for 1 hour. Then first distilled water at normal pressure, then decompressed under 20 mm Hg vacuum, evaporated moisture at 140 DEG C in vacuum for 20 minutes, cooled the solution to 80 DEG C, slowly added dropwise neutralizing catalyst theoretical acid amount of 20% by weight concentrated sulfuric acid. Heat the system temperature to 80-90°C, turn on the vacuum system, dehydrate under high vacuum for 1 hour, then use nitrogen to blow 3-4 times to remove the air in the system, then adjust the reaction temperature of the system to 150°C Enter 155 grams of oxirane, control pressure<0.60MPa to carry out alkoxylation reaction; Obtain lauryl alcohol polyoxyethylene (7) ether.

[0026] (2) 240g (0.5 mole) of polyoxyethylene laury...

[0034] Get the foaming agent composition in [Example 1] and put it into a pressure bomb, put it into an oven and age it at 150°C for 10 days, take it out, and measure the foaming ability and foam of the composition after aging under the condition of 85°C water bath by Roche method The results of the half-life measured by the scanner are shown in Table 3.

[0035] table 3

[0036] X(weight)%

[0038] Get the foam composition lauryl alcohol polyoxyethylene (7) ether sodium benzene sulfonate 0.5 (weight)% in [Example 1], α-olefin sulfonate AOS 14160.1 (weight)% to carry out the plugging performance evaluation test, the quartz sand fills the core tube with a permeability of 4D, injects the aqueous solution of the foam agent composition into the sand tube at a speed of 2mL / min, and simultaneously presses in nitrogen gas at a speed of 9mL / min to measure the plugging performance. The plugging pressure difference is 1.55MPa, and the calculated resistance factor is 38.8.