Method and device for predicting position of front edge of fireflood

Abstract

The embodiment of the invention, which belongs to the technical field of petroleum development, provides a method and device for predicting the position of the front edge of a fireflood. The method comprises the following step: determining propulsion distances of a fireflood edge of each of a plurality of oil layers along all producing well directions according to distribution angles of a centralgas injection well in a target well group along all production well directions, the thickness of each of a plurality of oil layers of a target reservoir, an air amount consumed by combustion of the unit volume of oil layer, gas absorption percentages of all oil layers, accumulative injection rates of the central gas injection well along all production well directions within a certain period of time and stratum air retention rates between the central gas injection well and all production wells. Therefore, the propulsion distance of the fireflood front edge of each of the plurality of oil layersis predicted and thus the basis is provided for adjusting the injection-production parameters of the multi-layer fireflood during the production process.

Description

technical field [0001] The invention relates to the technical field of petroleum development, in particular to a method and device for predicting the position of a fire flooding front. Background technique [0002] Burning oil layer, also known as fire flooding, is a thermal recovery technology to improve the recovery rate of heavy oil reservoirs. It continuously injects air into the oil layer and ignites the oil layer, uses the coke-like substances generated during the pyrolysis reaction as fuel, uses the heat generated by combustion to improve the fluidity of the underlying crude oil, and generates carbon dioxide and nitrogen to form flue gas flooding. Push crude oil to production wells. During the stable combustion process of the oil layer, the combustion zone advances radially to form a fire line (the fire line is the position of the front edge of the fire drive). [0003] Due to the complex combustion reaction of fire flooding and the influence of formation heterogene...

AI Technical Summary

Problems solved by technology

[0006] (2) Uneven vertical utilization

And because the thin interbedded reservoirs have many vertical layers and the thickness of each layer is relatively small, it is very difficult to study the fire flooding position in each oil layer in the thin interbedded reservoirs

[0007] In addition, the inventors of the present application have found that the existing methods for predicting the position of the fire flooding front based on material balance are all aimed at single-layer homogeneous reservoirs, and do not consider the complex situation of uneven vertical production of multi-layer fire flooding, and also There is no technical solution for predicting the location of firefloods in multi-layer reservoirs

Images