A method for judging the farthest construction radius of chemical viscosity reduction in heavy oil reservoirs

Abstract

The invention provides a determination method for farthest construction radius of cold production chemical viscosity reduction developed in heavy oil reservoir. The method comprises the following steps: firstly, determining an oil well needs construction and the oil well has construction values, obtaining related construction parameters; then analyzing and calculating flow resistance caused by starting pressure gradient of heavy oil reservoir and driving pressure established by pressure drop of oil deposit production, finally, through calculating (difference of driving pressure subtracting flow resistance is smaller than zero), determining reservoir non-movable oil radius range under current oil well production conditions, and finally obtaining the farthest construction radius of a viscosity reducer. Through on-site chemical viscosity reduction, construction range is determined, construction method is more reasonable, and construction risks are greatly reduced.

Description

technical field [0001] The invention relates to the technical field of petroleum engineering, in particular to a method for judging the farthest construction radius of chemical viscosity reduction in heavy oil reservoirs. Background technique [0002] The "cold recovery" of heavy oil is relative to the "hot recovery" of heavy oil. It does not reduce the viscosity of crude oil by raising the temperature, but uses other means to achieve the purpose of viscosity reduction recovery through methods that do not involve temperature rise. [0003] Among them, the development of chemical viscosity reduction is a technology developed at home and abroad in recent years. Its basic principle is to inject surface active substances into the bottom of production wells to greatly reduce the viscosity of crude oil (the reduction rate can reach more than 90%), thereby increasing the viscosity of crude oil. Fluidity ability to achieve the purpose of reducing viscosity and drag. This process is...

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Problems solved by technology

Often the determination of the construction radius is determined through indoor experiments and numerical simulations. This process is time-consuming and laborious, delaying the construction timing; or empirical design is adopted, which is likely to bring risks to the construction.

A construction radius that is too far will not only bring in high-cost investment, but also increase the difficulty of construction. Therefore, a method for determining the farthest construction radius for chemical viscosity reduction is needed, and the construction radius can be designed within the farthest construction radius. Production design is required to reduce construction risks

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