Foaming agent for oilfield, and preparation method thereof
A foaming agent, oil field technology, applied in the directions of chemical instruments and methods, drilling compositions, etc., can solve the problems of low foaming amount, inability to achieve the use effect, poor foam stabilization effect, etc. High foam quality, small and stable foam
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[0019] The present invention also provides the preparation method of the above-mentioned oil field foaming agent, which is specifically implemented according to the following steps:
[0020] Step 1, weigh the following raw materials by mass percentage: dodecyl dimethyl betaine 10%~20%, lauramidopropyl betaine 5%~15%, octadecyl glucoside 3%~10%, butanediol 1% to 5%, deionized water 55% to 80%, the sum of the above components is 100%;
[0021] Step 2, add the dodecyl dimethyl betaine weighed in step 1 into the reaction kettle, stir and heat up to 40 ° C, add lauramidopropyl betaine and octyl decyl glucoside in turn, stir for 0.5 to 1 h, and then sequentially Add deionized water and butanediol, and continue stirring for 1-2h;
[0022] Step 3, reduce the stirring speed, add a pH adjuster citric acid or sodium carbonate according to the pH of the mixed solution, adjust the pH of the solution to 6-8, and obtain a foaming agent when the solution is lowered to room temperature.
Embodiment 1
[0024] Weigh 150kg of dodecyl dimethyl betaine and add it to the reaction kettle, stir and heat up to 40°C, add 150kg of lauryl amidopropyl betaine and 100kg of octyl decyl glucoside in turn and continue to stir, stir for 0.7h, then add 550kg in turn The deionized water and 50kg of butanediol were continuously stirred for 1.5h, the stirring speed was reduced, 10kg of citric acid was added, the pH of the solution was adjusted to 6, and the foaming agent was obtained when the solution was lowered to room temperature.
[0025] Take 0.5ml of the above foaming agent and add it to 100ml of deionized water, stir at 9000r / min for 1 minute, pour it into a 500ml measuring cylinder and observe that the foam volume is 465ml and the half-life is 6.5 minutes. Similarly, take 0.5ml of the above foaming agent and add it to 100ml with a salinity of 20×10 4 mg / L of mineralized water, stir at 9000r / min for 1 minute, pour it into a 500ml graduated cylinder, observe that the foam volume is 465ml, ...
Embodiment 2
[0027] Weigh 200kg of dodecyl dimethyl betaine and add it to the reaction kettle, stir and heat up to 40°C, add 100kg of lauryl amidopropyl betaine and 30kg of octyl decyl glucoside in turn and continue to stir, stir for 0.5h, and then add 640kg in turn The deionized water and 30kg of butanediol were continuously stirred for 1h, the stirring speed was reduced, 10kg of sodium carbonate was added, the pH of the solution was adjusted to 8, and the foaming agent was obtained when the solution was lowered to room temperature.
[0028] Take 0.5ml of the above foaming agent and add it to 100ml of deionized water, stir at 9000r / min for 1 minute, pour it into a 500ml measuring cylinder and observe that the foam volume is 465ml and the half-life is 7 minutes. Similarly, 0.5ml of the above foaming agent was added to 100ml of deionized water, heated to 130 ° C, and then stirred at 9000r / min for 1 minute, poured into a 500ml graduated cylinder and observed that the foam volume was 430ml, an...
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