A Method and Calculation Device for Determining the Steeping Time of Super Heavy Oil by Steam Injection

Abstract

The present invention provides a method for determining the soaking time of super-heavy oil by steam injection, which comprises the following steps: calculating the temperature field distribution of the oil layer at the end of steam injection, the actual temperature field distribution of the oil layer at the end of the well soaking, and the actual temperature field distribution at the time of well opening and production. The relationship between the temperature field and production time, considering the rheological inflection point temperature of crude oil, calculate the relationship between the effective heating radius and the production time of the well under different soaking times; calculate the relationship between the oil drainage radius and the crude oil flow time under different soaking times 1. The relationship between the maximum relative drainage radius of the oil well and the production time; determine the best soaking time. The present invention considers the characteristics of the rheological inflection point of super heavy oil, considers the influence of formation pressure on the flow of crude oil, determines the soaking time based on the principle of the maximum oil drainage radius and production time, and ensures the maximum oil production. The embodiment of the calculation device for the soaking time of super-heavy oil steam injection oil production provided by the present invention can determine the optimal soaking time and ensure the maximum oil production.

Description

technical field [0001] The invention relates to the technical field of steam injection oil recovery, in particular to a method and a calculation device for determining the soaking time of steam injection oil recovery of super heavy oil. Background technique [0002] In oil extraction technology, the unprocessed oil directly extracted from oil wells is crude oil, which is a dark brown or dark green viscous liquid or semi-solid combustible substance composed of various hydrocarbons. Although the basic elements of crude oil are similar, there are many varieties of natural crude oil extracted from the ground in different production areas and different formations. The physical properties of various varieties of natural crude oil are very different, such as the viscosity of crude oil. Viscosity is a measure of the viscosity of a fluid, and it is a characterization of the friction between molecules of a liquid when it flows. The viscosity of different types of crude oil is genera...

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Problems solved by technology

The above method of determining the best soaking time considers that the injected steam should be released to the oil layer in the largest amount as the goal, and the time when the steam disappears in the heating zone and is completely condensed into water, and the pressure in the oil well is stable is determined as the best soaking time time, which makes the oil well soak for too long, and the temperature of the oil layer gradually cools down from the high temperature value, resulting in a large loss of heat, reducing the utilization rate of steam heat energy, and the maximum oil production cannot be guaranteed in actual production.

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