Compound microorganism oil-displacing agent for oil production and compounding method thereof

Abstract

The invention discloses a compound microorganism oil-displacing agent for oil production and a compounding method thereof. The oil-displacing agent is prepared from the following components in percentage by weight: 2-5 percent of an oligomeric surfactant, 5-9 percent of an activator and the balance of water, wherein the oligomeric surfactant is alkyl polyoxyethylene ether polymer, and the activator is prepared from a carbon source, a nitrogen source and a phosphorus source. The compounding method of the oil-displacing agent comprises the following steps: sampling oil-reservoir formation water, separating oil and water, and filtering the formation water; adding the activator into a closed reaction kettle according to the components and proportion, and stirring for 0.5-1.0 hour; adding the filtered formation water into the uniformly stirred activator, heating to 30-40 DEG C, and stirring for 2-3 hours to form an activator solution; and adding the oligomeric surfactant into the activator solution according to the component and proportion, heating to 40-50 DEG C, stirring for 4-6 hours, and standing for 0.5-2 hours. The oil-displacing agent has the characteristics of high displacement efficiency, low interfacial tension, wide oil reservoir application range, large scope of enhanced oil recovery, strong compounding performance, simple compounding method and strong operability, thus the oil-displacing agent can be widely applied to field testing of enhanced oil recovery.

Description

technical field [0001] The invention relates to the field of microbial oil recovery, in particular to a composite microbial oil displacement agent for oil recovery and a compounding method thereof. Background technique [0002] Endogenous microbial oil recovery technology directly utilizes the existing microbial community in the oil reservoir to enhance oil recovery. Due to the simplicity of its injection process and the avoidance of strain screening and fermentation processes, the cost is lower and its adaptability to the reservoir environment is strong, so it has been widely used. [0003] The disadvantages of current endogenous microbial oil recovery methods are: [0004] (1) Most of the endogenous nutrients used are pure nutrients. Such an activator has good water solubility, so the activator itself has good fluidity and low viscosity. It is difficult to ensure the residence time in the reservoir during the injection process. , to reduce the swept volume of the activat...

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Problems solved by technology

[0005] (2) Commonly used oil displacement surfactants are easy to improve the efficiency of water flooding, but they cause great damage to the formation, great environmental pollution in the reservoir, and high microbial inactivation rate

However, this oil displacement agent is only suitable for oil displacement and demulsification and demulsification using exogenous microbial technology in oil fields, and after compounding with the mentioned chemical surfactants, there is a certain degree of biological toxicity in the reservoir

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