Method for adopting linear fireflood for producing tail gas for burying and utilization

Abstract

The invention discloses a method for adopting linear fireflood for producing tail gas for burying and utilization. According to the method, a row of well drains in a well pattern is divided into gas-injection well drain bodies, other rows of well drains are divided into producing well drain bodies, ignition and gas injection are conducted on the first row of gas-injection well drain bodies, afterthe combustion front crosses the first row of producing well drain bodies, the first row of producing drain bodies are changed into the second row of gas-injection well drain bodies, and the first rowof gas-injection well drain bodies are changed into reinjection wells in which foam liquid and fireflood tail gas are injected; the foam liquid and the fireflood tail gas are injected into the reinjection wells, the injected foam liquid forms a foam blocking wall between the first row of gas-injection well drain bodies and the first row of producing well drain bodies, and the foam blocking well blocks the injected fireflood tail gas and the second row of gas-injection well drain bodies; meanwhile, the fireflood tail gas is buried under the wells; when the combustion front crosses the second row of producing well drain bodies, the second row of producing well drain bodies are changed into the third row of gas-injection well drain bodies, and the second row of gas-injection well drain bodies are changed into reinjection wells in which the foam liquid and the fireflood tail gas are injected; analogy is conducted gradually until the combustion front crosses the N th row of producing welldrain bodies.

Description

technical field [0001] The invention belongs to the technical field of oil reservoir exploitation, and in particular relates to a method for storing and utilizing tail gas produced by linear fire driving. Background technique [0002] At present, there are linear well pattern deployment methods in combustion oil layer. The problem faced in the development process of linear well pattern is: linear fire flooding goes through the initial ignition and step-by-step increase of gas injection rate. Once the gas injection well row forms an interconnected combustion zone After the leading edge, the size of the combustion interface remains basically unchanged. Therefore, objectively, as long as the gas injection rate is maintained at a constant rate, the propulsion rate of the combustion front can be guaranteed to be constant as well. This is beneficial to the design, construction and management of ground gas injection compressor stations and related supporting facilities such as pow...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems existing in the prior art, the present invention proposes a method for storing and utilizing tail gas produced by linear fire flooding aimed at linear fire flooding of oil layers. Air pollution problem, improve utilization rate of gas injection, reduce tail gas emission, improve oil recovery

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