A screening method for composite microbial oil displacement agent for oil recovery
A technology of composite microorganisms and composite oil displacement agents, which is applied in the direction of drilling compositions, mechanical devices, chemical instruments and methods, etc., can solve the problem of weak rheological properties of water flooding systems, reduce the survival rate and cost of microorganisms in oil reservoirs Advanced problems, to achieve the effect of strong operability and pertinence, extremely operability and pertinence, and enhanced oil recovery
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Embodiment 1
[0037] Example 1: Take Shengli Oilfield H 3 Reservoir as an example
[0038] Target reservoir H 3 Features are as follows: Reservoir permeability 1400×10 -3 μm 2 , with a porosity of 36%, is a high porosity and high permeability reservoir, the reservoir temperature is 65°C, the pressure is 10.3MPa, and the geological reserves are 3.5×10 4 t, the reservoir has been developed by water flooding and polymer flooding for 25 years, the recovery degree is 47.0%, and the water cut of the produced fluid reaches 96.0%. Implement the concrete steps of the present invention as follows:
[0039] 1. Compatibility evaluation
[0040] To the activator solution of the target oil reservoir, respectively add oligomeric nonionic surfactant with a molecular weight of 1000 to 2000 and a mass concentration of 1%, and an oligomeric anionic surfactant with a molecular weight of 1000 to 2000 and a mass concentration of 1%. Active agent and petroleum sulfonate with a mass concentration of 1%, afte...
Embodiment 2
[0067] Embodiment 2: Taking the P reservoir of Shengli Oilfield as an example
[0068] The characteristics of the target reservoir P are as follows: the reservoir permeability is 900×10 -3 μm 2 , with a porosity of 33.5%, is a high porosity and high permeability reservoir, the reservoir temperature is 70°C, the pressure is 12.5MPa, and the geological reserves are 4.8×10 4 t, the reservoir has been developed by water flooding for 21 years, the recovery degree is 40.2%, and the water cut of the produced fluid reaches 98.2%. Implement the concrete steps of the present invention as follows:
[0069] 1. Compatibility evaluation
[0070] To the activator solution of the target oil reservoir, respectively add oligomeric nonionic surfactant with a molecular weight of 2000 to 3000 and a mass concentration of 2%, and an oligomeric anionic surfactant with a molecular weight of 2000 to 3000 and a mass concentration of 2%. Active agent and petroleum sulfonate with a mass concentration ...
Embodiment 3
[0097] Embodiment 3 Take the L reservoir of Shengli Oilfield as an example
[0098] The characteristics of the target reservoir L are as follows: the reservoir permeability is 750×10 -3 μm 2 , with a porosity of 33.5%, is a high porosity and high permeability reservoir, the reservoir temperature is 58°C, the pressure is 13.2MPa, and the geological reserves are 7.2×10 4 t, the reservoir has been developed by water flooding and polymer flooding for 21 years, the recovery degree is 38.5%, and the water cut of the produced fluid reaches 98.8%. Implement the concrete steps of the present invention as follows:
[0099] 1. Compatibility evaluation
[0100]To the activator solution of the target oil reservoir, add respectively an oligomeric nonionic surfactant with a molecular weight of 3000-5000 and a mass concentration of 1.5%, and an oligomeric anionic surfactant with a molecular weight of 3000-5000 and a mass concentration of 1.5%. Active agent and petroleum sulfonate with a m...
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Abstract
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