Temperature calculation and control method and device for mixed liquor of gravity fire flooding production well

Abstract

The invention provides a temperature calculation and control method and a temperature calculation and control device for the mixed liquor of a gravity fire flooding production well. The method comprises the following steps of calculating an upper limit value of heat loss of a shaft of the production well; setting initial radial heat loss values of segmented units of the shaft according to the upper limit value of the heat loss of the shaft; iteratively calculating first temperature field distribution from the heel to the tiptoe of the shaft of the production well according to the set initial heat loss values; calculating hot water temperature T2 at an outlet of an oil pipe at the tiptoe according to the first temperature field distribution, and calculating the initial temperature of the oil-water mixed liquor at the tiptoe; calculating second temperature field distribution from the tiptoe to the heel according to the first temperature field distribution and the initial temperature of the oil-water mixed liquor at the tiptoe; regulating an injection parameter of a wellhead according to the calculated second temperature field distribution of the mixed liquor of the production well, and controlling the temperature of the mixed liquor. According to each embodiment of the invention, the temperature of the mixed liquor of the production well can be rapidly and accurately calculated and controlled.

Description

technical field [0001] The invention belongs to the technical field of petroleum fire flooding, and in particular relates to a method and device for calculating and controlling the temperature of a mixed liquid in a horizontal production well in gravity fire flooding. Background technique [0002] In the field of oil extraction, fire flooding is a common and very important oil extraction method. This method usually refers to injecting air or oxygen into the underground oil layer to burn it with the organic fuel in the oil layer, and use the heat generated by the combustion to heat the crude oil to be mined. After heating, the crude oil is unloaded to the level of the horizontal production well driven by gravity. section, and then the method of extracting oil through the lifting effect of the horizontal well. [0003] Fire flooding is a thermal oil recovery technology that generates heat inside the oil layer. It has obvious technical advantages and potentials in the field of...

AI Technical Summary

Problems solved by technology

In the prior art, the traditional oil well temperature measurement device adopts the casing temperature measurement, which is time-consuming and laborious to install and use, and the use and maintenance costs are high

At the same time, when measuring the temperature of the fluid in the pipeline, in order to protect the thermometer, a temperature measuring sleeve is usually installed in the pipeline, resulting in low accuracy of the temperature measurement due to the heat transfer resistance of the test device

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