A kind of aluminum gel regulating and displacing agent and preparation method thereof
A technology of aluminum gel adjustment and retarder, which is applied in chemical instruments and methods, drilling compositions and other directions, can solve problems such as poor technical adaptability, and achieves improved oil displacement efficiency, improved oil recovery, and reduced crude oil viscosity. Effect
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Embodiment 1
[0029] (1) Add 2g of CO(NH 2 ) 2 Add to 93g brine (total salinity 12×10 4 mg / L, Calcium 4000mg / L, Magnesium 1000mg / L), stirring and dissolving to form additives for later use.
[0030] (2) Add 5g of crystalline aluminum trichloride to the additive, stir until completely dissolved, and obtain an aluminum gel modifier.
[0031] Put the above-mentioned aluminum gel displacing agent into a 100ml high-temperature-resistant glass tube with a stopper, seal it and put the high-temperature tube into a constant temperature box at different temperatures, the following reactions will occur and a gel will be formed.
[0032] Under the condition of high temperature in the reservoir, the additive undergoes the following hydrolysis reaction:
[0033] CO(NH 2 ) 2 +3H 2 O=NH 4 HCO 3 +NH 3 h 2 o
[0034] The gel forming agent reacts as follows under weakly alkaline conditions:
[0035] Al 3+ +3HCO 3 - =Al(OH) 3 +3CO 2
[0036] Al 3+ +3NH 3 h 2 O=Al(OH) 3 +3NH 4 +
[0037...
Embodiment 2
[0044] (1) Add 2g of NH 4 HCO 3 Add to 93g brine (total salinity 12×10 4 mg / L, Calcium 4000mg / L, Magnesium 1000mg / L), stirring and dissolving to form additives for later use.
[0045] (2) Add 5g of crystalline aluminum trichloride and 0.1g of citric acid to the additives, stir and dissolve to obtain a slow-setting aluminum gel modifier.
[0046] Pack the above-mentioned aluminum gel regulating and displacing agent into temperature-resistant and pressure-resistant steel cylinders, seal them and place them in a constant temperature box at 130°C, take them out regularly and measure the viscosity of the gel.
[0047] Under the condition of high temperature in the reservoir, the additive undergoes the following hydrolysis reaction:
[0048]
[0049] The gel forming agent reacts as follows under weakly alkaline conditions:
[0050] Al 3+ +3HCO 3 - =Al(OH) 3 +3CO 2
[0051] Al 3+ +3NH 3 h 2 O=Al(OH) 3 +3NH 4 +
[0052] Weak alkaline ammonia water reacts with organ...
Embodiment 3～10
[0055] Embodiments 3-10: The steps are the same as in Embodiment 1 or 2, and the reactants and consumption are as shown in Table 2.
[0056] Table 2 An embodiment of reactants and dosage proportions of an aluminum gel regulating and displacing agent
[0057]
[0058]
[0059] The viscosity of the base fluid was measured with a cloth-type rotational viscometer for the inorganic aluminum gel regulating and displacing agents obtained in Examples 1-10, and the results are shown in Table 3.
[0060] Put the inorganic aluminum gel regulating and displacing agent obtained in Examples 1 to 10 into a 100ml high-temperature-resistant glass tube with a stopper, and after sealing, put the high-temperature tube into a constant-temperature electric heating and constant-temperature blast drying oven for reaction, and start timing. After the solution in the high-temperature tube turns from transparent to white to stagnant, it is considered that a gel has been formed. At this time, the g...
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