Method for determining water driving equilibrium displacement through tracer technology

Abstract

The invention provides a method for determining water driving equilibrium displacement through a tracer technology. The method for determining water driving equilibrium displacement through the tracer technology comprises the following steps: step 1, filling a geologic model with water and adding a tracer into the geologic model, so as to obtain different oil-water interwell communication values; step 2, calculating a displacement breakthrough coefficient through the oil-water interwell communication values; step 3, obtaining a displacement breakthrough coefficient threshold value for judging whether the displacement is equilibriumm or not through analysis of oil-water interwell surplus oil; and step 4, judging whether all well groups reach displacement equilibrium or not according to the displacement breakthrough coefficient and by combining with the displacement breakthrough coefficient threshold value, so as to provide a basis for offshore vectorization allocation and injection allocation. The method for determining water driving equilibrium displacement through the tracer technology is clear in thought, simple and convenient in application and provides a technical support for greatly increasing the recovery ratio of offshore oilfields in middle and high water periods.

Description

technical field [0001] The invention relates to the technical field of oil field development, in particular to a method for determining water flooding equilibrium displacement by using tracer technology. Background technique [0002] Shengli Offshore Chengdao Oilfield has produced more than 2 million tons of oil annually for 13 years. From a marginal oilfield to my country's first "million-ton" and "2 million-ton" ultra-shallow oilfields, Chengdao Oilfield has set a record for the largest production capacity of my country's ultra-shallow oilfields. [0003] However, with the progress of development, due to the limitations of the environment, drilling and production, and offshore engineering construction capabilities, the contradiction between the low oil production rate of the oil field and the limited service life of the platform has become increasingly obvious. The main problem faced by Chengdao Oilfield is to improve the recovery rate and make full use of underground res...

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Problems solved by technology

[0003] However, with the progress of development, due to the limitations of the environment, drilling and production, and offshore engineering construction capabilities, the contradiction between the low oil production rate of the oil field and the limited service life of the platform has become increasingly obvious. The main problem faced by Chengdao Oilfield

[0004] Significantly increasing the liquid volume is an effective way to increase the recovery rate of the offshore oilfield platform within the effective period, and the important criterion for ensuring the liquid extraction effect is whether the balanced displacement can be achieved to the maximum extent during the water flooding process, the injection water sweep coefficient can be improved, and the water content can be avoided. However, how to judge whether the water displacement is balanced? So far, there is no fixed standard parameter and judgment method. The conventional judgment method of remaining oil saturation is studied through numerical simulation. The steps are cumbersome, the workload is heavy, and the application is very inconvenient.

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