Method and system for analyzing steam suction condition of thick oil horizontal well

Abstract

The invention provides a method and a system for analyzing the steam suction condition of a thick oil horizontal well. The method comprises the following steps of sectionalizing the horizontal well, and setting the gas injection volume of each section; calculating the average temperature of each section after liquid production according to basic well temperature data and stratus heat loss data by adopting stratum heat transfer and mass transfer principle as a constraint condition; constructing a theoretical well temperature curve of the horizontal well in the throughput round according to the average temperature of each section of the horizontal well after the liquid production; fitting the theoretical well temperature curve of the horizontal well in the throughput round and a measured well temperature curve of the throughput round, and performing inversion according to the fitted theoretical well temperature curve to obtain the gas injection volume of each section of the horizontal well. According to the method and the system, the use condition of the sections of the horizontal well can be evaluated, the use degree can be analyzed, and thick oil horizontal well process measure regulation and oil reservoir analysis can be guided.

Description

technical field [0001] The invention relates to the technical field of petroleum exploration, in particular to a method and system for analyzing the steam absorption status of heavy oil horizontal wells. Background technique [0002] Heavy oil refers to high-viscosity heavy crude oil with a viscosity greater than 50 mPa·s under formation conditions, or a degassed crude oil with a viscosity of 1000-10000 mPa·s at the reservoir temperature. In addition to high viscosity, heavy oil also has high density. Heavy oil contains less light distillate and high content of colloid and bitumen. The viscosity of heavy oil changes significantly with the temperature, for example, the temperature increases by 8-9. C, the viscosity can be reduced by half. Therefore, in the exploitation and transportation of heavy oil, heat is often used to reduce its viscosity, such as steam drive, thermal oil circulation, and burning oil layers. It can also be mixed with thin oil, emulsified, and added a...

AI Technical Summary

Problems solved by technology

Due to the impact of reservoir permeability and steam injection heating effect, the production status of heavy oil horizontal wells is complicated. Under the condition that it is difficult to obtain steam absorption and liquid production profile data, it is still impossible to effectively evaluate the production status of horizontal well reservoirs.

At present, in production, before steam injection and after huff and puff production, a large number of well temperature data of horizontal wells are collected through tubing transmission, and the production degree of horizontal sections can be qualitatively understood through temperature changes. This evaluation method is too simple and unreasonable. Now the production urgently needs Evaluate the usage status

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