High-temperature sandstone oil reservoir retarded acid and preparation method thereof
A sandstone reservoir, retarded acid technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of fast reaction speed of acid rock, weak retarded acidity, limited dissolution ability, etc., to achieve delayed reaction The effect of speed, unblocking formation, and strong dissolution ability
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[0019] Example 1
[0020] (1) Weigh 100g of β-cyclodextrin, put it in a mortar, add 30ml of distilled water, and grind to a paste liquid;
[0021] (2) Weigh 12.7g methanesulfonic acid powder and add it to the above β-cyclodextrin paste liquid;
[0022] (3) Grind the mixture for 2 hours to obtain a uniform paste;
[0023] (4) Place the paste in a dry box and keep it at 50°C for 12 hours to obtain an inclusion compound of methanesulfonic acid and β-cyclodextrin;
[0024] (5) Add the obtained clathrate and 13.05g of ammonium fluoride to 100ml of water, stir well until all the solid powder is dissolved, and obtain a high-temperature sandstone reservoir slow acid solution.
Example Embodiment
[0025] Example 2
[0026] (1) Weigh 113.5g of β-cyclodextrin, put it in a mortar, add 40ml of distilled water, and grind to a paste liquid;
[0027] (2) Weigh 9.61 g of methanesulfonic acid powder and add it to the above β-cyclodextrin paste liquid;
[0028] (3) Grind the mixed solution for 1.5 hours to obtain a uniform paste;
[0029] (4) Place the paste in a dry box and hold it at 50°C for 8 hours to obtain an inclusion compound of methanesulfonic acid and β-cyclodextrin;
[0030] (5) Add the obtained clathrate and 11.4 g of ammonium fluoride to 90 ml of water, and stir thoroughly until all the solid powder is dissolved to obtain a high-temperature sandstone reservoir slow acid solution.
Example Embodiment
[0031] Example 3
[0032] (1) Weigh 113.5g of β-cyclodextrin, put it in a mortar, add 50ml of distilled water, and grind to a paste liquid;
[0033] (2) Weigh 19.22g of methanesulfonic acid powder and add it to the above β-cyclodextrin paste;
[0034] (3) Grind the mixture for 2 hours to obtain a uniform paste;
[0035] (4) Place the paste in a dry box and keep it at 50°C for 12 hours to obtain an inclusion compound of methanesulfonic acid and β-cyclodextrin;
[0036] (5) Add the obtained clathrate and 45.6 g of ammonium fluoride to 60 ml of water, and stir thoroughly until all the solid powders are dissolved to obtain a high-temperature sandstone reservoir slow acid solution.
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