An integral profile control process of nitrogen foam in the process of exploiting heavy oil reservoirs

Abstract

The invention discloses integrated profile control technology of nitrogen foams during recovery of viscous oil reservoirs. The integrated profile control technology comprises a fixed station, a nitrogen foam generator, a nitrogen foam repetition generator, a nitrogen foam dispenser and nitrogen foam metering devices, all of which are sequentially connected.The fixed station comprises a nitrogen trolley group, a steam boiler and a foaming agent injection and skidding unit. The nitrogen trolley group, the steam boiler and the foaming agent injection and skidding unit are connected with the nitrogen foam generator. At least one nitrogen foam metering device is connected with corresponding shaft mouths. The integrated profile control technology of nitrogen foams during recovery of viscous oil reservoirs has following beneficial effects: the integrated profile control fails due to complex operation of steam-driven nitrogen foam profile control technology; the integrated profile control technology helps achieve linkage profile control of steam-driven with blocks; and development effect of steam flooding of viscous oil is improved.

Description

technical field [0001] The invention relates to oil extraction technology, in particular to an overall profile control process of nitrogen foam in the process of exploiting heavy oil reservoirs. Background technique [0002] The heavy oil reservoir enters the later stage of multiple rounds of steam huff and puff, and the development effect becomes worse, which is manifested by low periodic oil production, low oil-gas ratio, and high comprehensive water cut. The low sweep efficiency of injected steam is the main reason for the above problems. Formation heterogeneity together leads to serious steam channeling, the injected steam flows from the high permeability zone, and the low permeability zone rich in remaining oil has not been effectively produced, which leads to the increase of water content in the produced fluid after multiple rounds of huffing and puffing, and the effect becomes poor . [0003] Injecting foam agents with steam can improve the sweep efficiency and disp...

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Problems solved by technology

[0004] The purpose of the present invention is to provide an overall profile control process of nitrogen foam in the process of exploiting heavy oil reservoirs, which solves the problem that the steam flooding nitrogen foam profile control process is complicated to operate and cannot achieve overall profile control, and realizes the process of steam flooding block Linkage profile control to improve the development effect of heavy oil steam flooding

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