High-temperature-resistant high-strength gel
A high-strength, high-temperature-resistant technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problem of affecting the development effect of water flooding or polymer flooding, weak temperature resistance and chemical stability, and medium permeability layer sweep Low level problems, to achieve good plugging effect, good temperature resistance, long validity period
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[0042] The present invention also relates to a preparation method of a high-temperature-resistant high-strength gel plugging regulating system, which comprises the following steps:
[0043] (1) Add water into the container, then add polyacrylamide under stirring, for example, 500r / min-800r / min, and stir evenly;
[0044] (2) Add the enhancer, pH regulator, stabilizer and phenolic resin into the container of step (1) sequentially while stirring, and continue to stir, for example, stirring at a stirring speed of 500r / min-800r / min for 2-3h to obtain homogeneous mixture;
[0045] (3) Heating, for example, at 100°C-130°C, preferably at 100°C-120°C, to react the mixture in step (2), for example over 8 hours, to form a solidified composite mineral gel.
[0046] In one embodiment of the present invention, the water in step (1) is mineralized water.
[0047] In one embodiment of the present invention, the preparation method of the high-temperature-resistant high-strength gel plugging ...
Embodiment 1
[0057] Add 198.4g of oilfield injection water (salinity 7674mg / L) into a 300mL beaker, slowly add 0.8g of HPAM into the beaker at a stirring speed of 600r / min, and stir evenly; Add ammonium, 0.1g phosphoric acid and 0.1g thiourea into a beaker, dissolve and add 0.4g phenolic resin while stirring; adjust the stirring speed to 300r / min, and continue stirring for 2.5h to obtain a uniform mixture; pour the prepared mixture into Put it in a stoppered test tube and put it in an oven at 100°C for 24 hours to generate a temperature-resistant high-strength gel plugging agent. The plugging rate of the plugging agent obtained in laboratory experiments can reach 98%.
Embodiment 2
[0059]Add 196.3g of oilfield injection water (salinity 8350mg / L) into a 300mL beaker, slowly add 1.2g of HPAM into the beaker at a stirring speed of 600r / min, and stir evenly; Add ammonium, 0.2g phosphoric acid and 0.14g thiourea into a beaker, dissolve and add 0.6g phenolic resin while stirring; adjust the stirring speed to 300r / min, and continue stirring for 2.5h to obtain a uniform mixture; pour the prepared mixture into Put it in a stoppered test tube and put it in an oven at 110°C for 12 hours to generate a temperature-resistant high-strength gel plugging agent. The plugging rate of the plugging agent obtained in laboratory experiments can reach 98%.
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