Layered fire-flooding chemical ignition concentric double-pipe string and production method

Abstract

The invention relates to a layered fire-flooding chemical ignition concentric double-pipe pipe string and a mining method. The pipe string comprises an inner pipe and an outer pipe, a pipe string annulus is formed between the inner pipe and the outer pipe, and a pipe string annulus is formed between the outer pipe and the casing. The oil jacket annulus is formed, and the outer pipe is provided with a large-diameter anchoring sealing device; the outer pipe is provided with a pressure differential sliding sleeve integrated layered steam injection valve, and the pressure differential sliding sleeve integrated layered steam injection valve can be connected to the pipe string annulus. and the first stratum; a large-diameter packer for fire flooding is set on the outer pipe, and the large-diameter packer for fire flooding can seal off the oil jacket annulus above the second stratum; The pipe can be sealed through the sliding insertion sealing device, and the sliding insertion sealing device can expand inward to seal off the pipe string annulus; the bottom end of the outer pipe is provided with a ball seat structure, and the ball seat structure can communicate with the inner pipe and the second formation . The pipe string and the mining method have the advantages of high mining efficiency, high reliability and short operation period, and two process measures of layered ignition and layered steam injection can be realized by one trip of the pipe string.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to a layered fire flooding chemical ignition concentric double-pipe string and an exploitation method. Background technique [0002] At present, in heavy oil recovery operations, the Liaohe fire flooding block is a multi-layer or thick-layer oil reservoir with a large longitudinal span and strong heterogeneity, and general ignition cannot meet the requirements. Although the developed mobile electric igniter has successfully achieved high temperature ignition in the field test, the application in the stratified ignition process, including the ignition mechanism, stratified ignition process, stratified ignition string, and the performance of the igniter itself, still needs to be The research is perfect, and the research on layered fire flooding-chemical ignition technology is imminent. [0003] Therefore, the inventor of the present invention proposes a layered fire-fl...

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Problems solved by technology

[0002] At present, in heavy oil production operations, Liaohe fire flooding blocks are multi-layer or thick-layer oil reservoirs, with large vertical spans and strong heterogeneity of oil layers, and general ignition can no longer meet the requirements

Although the mobile electric igniter that has been developed has successfully achieved high-temperature ignition in field tests, it still needs to be applied in the process of stratified ignition, including the ignition mechanism, stratified ignition process, stratified ignition column, and the performance of the igniter itself. The research is perfect, and the study of stratified fire flooding-chemical ignition technology is imminent

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