Mining method suitable for low-permeability conglomerate oil reservoir
A production method and technology for oil reservoir production, which are applied in the fields of production fluids, chemical instruments and methods, and earth-moving drilling, etc., can solve the problems that the recovery factor needs to be improved and the injection pressure is high, so as to improve the oil recovery factor and reduce the injection pressure. The effect of pressure, good construction performance
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Embodiment 1
[0029] A reservoir production method suitable for low-permeability conglomerate reservoirs, comprising:
[0030] (1) Use water to prepare a partially hydrolyzed polyacrylamide polymer solution with a molecular weight of 3.42 million and a concentration of 500 mg / L (the polyacrylamide polymer is Beijing Hengju Co., Ltd., model KY-1SM, molecular weight 3.42 million).
[0031] (2) Adopt oilfield produced water to directly prepare surfactant solution, the surfactant of concentration 1000mg / L is anionic surfactant and is naphthenic petroleum sulfonate (Karamay City Jinta Co., Ltd., model KPS, molar molecular mass is 420g / mol).
[0032] (3) Inject the polyacrylamide polymer solution in step (1) into the oil reservoir at an injection rate of 0.08PV / a, and the injection volume is 0.1PV.
[0033](4) After step (3) injects 0.02PV, alternately inject the surfactant solution in step (2) and the polymer solution in step (1), the alternating sequence is surfactant solution-polymer solution...
Embodiment 2
[0035] The difference from Example 1 is that the surfactant is heavy alkylbenzene sulfonate (sodium heavy alkylbenzene sulfonate is Daqing Donghao Investment Co., Ltd., model DPS, molar molecular mass is 600g / mol).
Embodiment 3
[0037] The difference from Example 1 is that the surfactant is fatty alcohol polyoxyethylene ether (lauryl alcohol).
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