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

• Main Authors: HE MENGQI, FANG LIANGFENG, MA ZHEN, QU SHAOGANG, ZHANG CHENGBO, YU XIAOCONG, PENG SONGLIANG, CUI GUANLIN, LI CHENXI, QU ZHENZHE, LIU HONGQIN, ZHANG LIN
• Format: Patent
• Language: English
• Published: 04.03.2015
• Subjects: CALCULATING; COMPUTING; COUNTING; EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; ELECTRIC DIGITAL DATA PROCESSING; FIXED CONSTRUCTIONS; MINING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS; PHYSICS

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.