中国石油网消息：8月14日，辽河油田洼60-H29井烟道气捕集—回注现场，过滤净化、冷却干燥、增压输送等核心设备正全速运转，高压烟道气被精准注入施工井中。截至目前，辽河油田今年利用3套注入设备，已阶段性实施烟道气回注10井次，累计注入158万标准立方米。

China Oil News: On August 14th, at the flue gas capture and reinjection site of Huagai 60-H29 well in Liaohe Oilfield, core equipment such as filtration purification, cooling and drying, and pressure boosting transportation are all operating at full capacity. The high-pressure flue gas is precisely injected into the construction well. As of now, Liaohe Oilfield has used 3 sets of injection equipment this year and has implemented flue gas reinjection in 10 stages, with a total injection volume of 1.58 million standard cubic meters.

稠油开发过程中，注汽锅炉运行产生大量烟道气，主要成分为氮气、二氧化碳及少量氧气。随着辽河油田开发进入中后期，多数吞吐油藏逐步进入低压低产阶段。烟道气里的二氧化碳与氮气是辅助稠油开发的重要介质，可起到补充地层能量增压、隔热减少热损失、降低原油黏度的作用。

During the process of heavy oil development, the operation of steam injection boilers generates a large amount of flue gas, which mainly consists of nitrogen, carbon dioxide and a small amount of oxygen. As the development of Liaohe Oilfield enters the middle and late stages, most of the production oil reservoirs gradually enter the low-pressure and low-yield stage. The carbon dioxide and nitrogen in the flue gas are important media for assisting heavy oil development. They can play a role in supplementing reservoir energy for pressure increase, reducing heat loss through insulation, and lowering the viscosity of crude oil.

辽河油田致力于开展烟道气回注技术攻关，通过回注烟道气辅助稠油开发，实现补能驱油、改善开发、减少温室气体排放的效果。根据前期研究，今年辽河油田进一步优化拓展了烟道气回注应用场景，选藏选井以稠油油藏吞吐井为主。结合机理认识、矿场实践、不同方式、不同开发阶段等多重因素综合评价烟道气回注利用潜力后，工作人员筛选58个组合区块单元稠油油藏、1548口井适合注入烟道气，覆盖储量超过6亿吨。按照“兼顾补能与提采，源与藏就近匹配”的原则，确定了厚层稠油辅助泄油、高倾角辅助泄油、单井吞吐补能等7种应用场景。

Liaodong Oilfield is committed to conducting research and development on the technology of injecting flue gas back into the system. By injecting flue gas to assist in the development of heavy oil, it aims to achieve replenishment of energy for oil production, improve the development process, and reduce greenhouse gas emissions. Based on previous research, this year Liaodong Oilfield has further optimized and expanded the application scenarios of flue gas injection, prioritizing the selection of wells in heavy oil reservoirs for injection. Taking into account multiple factors such as mechanism understanding, field practice, different methods, and different development stages, after comprehensive eva luation of the potential for flue gas injection utilization, the staff selected 58 combined block units of heavy oil reservoirs and 1,548 wells suitable for injecting flue gas, covering reserves of over 600 million tons. According to the principle of "balancing energy replenishment and extraction, matching source and storage as close as possible", seven application scenarios were determined, including thick-layer heavy oil auxiliary drainage, high-angle auxiliary drainage, and single-well pumping for energy replenishment.

“如何防腐和选择合适应用场景，是近年烟道气回注技术改进的重点。”辽河油田勘探开发研究院一级工程师侯国儒说。早期辽河油田曾尝试应用烟道气辅助SAGD技术，但技术人员发现，烟道气对注入管柱造成了较为严重的腐蚀。近年来，油田对此开展系列技术攻关，完成烟道气腐蚀机理研究，研发高温耐腐蚀涂层，形成了腐蚀控制技术。

"How to prevent corrosion and select appropriate application scenarios is the key focus of the recent improvements in the flue gas reinjection technology," said Hou Guorui, a first-level engineer at the Exploration and Development Research Institute of Liaohe Oilfield. In the early days, Liaohe Oilfield attempted to apply flue gas to assist the SAGD technology. However, the technicians discovered that the flue gas caused severe corrosion to the injection tubing. In recent years, the oilfield has carried out a series of technical research efforts, completed the research on the corrosion mechanism of flue gas, developed high-temperature corrosion-resistant coatings, and formed the corrosion control technology.

在注入工艺方面，技术人员结合蒸汽与烟道气的性质特点，优选段塞注入方式和井筒注入工艺方案。与油管混注、油套分注等两相气体注入方式不同，该方式能缩短注入时间，可最大程度控制腐蚀反应的环境条件，实现低成本实施。

In terms of injection technology, the technicians took into account the characteristics of steam and flue gas, and selected the plug injection method and wellbore injection process scheme. Different from two-phase gas injection methods such as tubing mixed injection and oil-tube separate injection, this method can shorten the injection time, can control the environmental conditions of the corrosion reaction to the greatest extent, and can achieve low-cost implementation.