A method for oil well water plugging by activating reservoir microorganisms to produce emulsifier

Abstract

The invention belongs to the technical field of oil and gas field development and particularly relates to an oil well water plugging method adopting an emulsifying agent generated by activating oil reservoir microorganisms. The oil well water plugging method specifically comprises the following steps of screening of a test oil well, preliminary screening of an activating agent, determining of the activating agent, determining of the water plugging radius, determining of the injection rate of the activating agent and conducting of a field test and evaluating of a field test result. The oil well water plugging method adopting the emulsifying agent generated by activating the oil reservoir microorganisms has the characteristics of being simple in technology and high in pertinence and operability, and field application and popularization are facilitated; the validity period of the field test is long, the oil increasing effect is good, the input-output ratio is high, the validity period is longer than 12 months, the average daily oil increasing amount of a single well is larger than 5 t, and the input-output ratio is larger than 1:5. Thus, the oil well water plugging method adopting the emulsifying agent generated by activating the oil reservoir microorganisms can be widely applied to an oil well water plugging technology.

Description

technical field [0001] The invention relates to a method for oil well water plugging by using activated oil reservoir microbes to produce emulsifiers, and belongs to the field of oil well water plugging agents. Background technique [0002] At present, most oilfields in my country have entered the middle and late stages of exploitation, and water flooding is widely used. After decades of intensive exploitation, some oilfields have entered a period of "high water cut, high input, and low output". In addition, for newly developed oilfields in the west, such as Tahe Oilfield, etc., due to the high oil recovery rate, the bottom water in the reservoir is coning, the oil well breaks through water prematurely, and the water cut rises too fast. Moreover, the pressure of most oil wells has dropped after many years of production, usually due to high water cut after slow water flooding, and oil and water flow out together for a long time. The problem of water output from oil wells wil...

AI Technical Summary

Problems solved by technology

The composition of the above-mentioned crude oil emulsifier is relatively complicated, the cost is relatively high, the economic benefit in actual use is relatively poor, and the preparation method of the emulsifier is also relatively complicated

Petroleum sulfonate formaldehyde condensate and fatty alcohol polyoxyethylene ether have certain toxicity

At the same time, the existing production methods all need to use a special reactor with water jacket cooling, which needs to provide power to circulate the water to cool down, which will cause a waste of energy

In addition, if the circulating water is to be cooled, a large container must be used. Some preparation methods do not use containers for cooling, but using tap water for cooling will cause water waste, and the discharge of water after cooling will also bring certain environmental problems.

At the same time, since both the water shutoff agent and the crude oil emulsifier contain low-toxicity and low-hazard chemical components, it will cause damage to the formation and increase the cost of subsequent water treatment

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