为了解决高产水气井采输系统压损大、井筒携液困难、地面集输效率低及采出水处理成本高等一系列问题，实现高含水气藏规模效益开发，采用数值模拟与现场实践的方法对所研发的同井采注技术进行了优化提升。研究结果表明：①研制的高产水气井电动潜油离心泵同井采注技术，既通过电泵深抽强排高效采气，又确保采出水直接井下注入地层；②所建立的潜油电泵同井采注井下气液分离器CFD数值模型，能有效预测井下分离器出口分气效率，平均误差6.92%，并设计采用二级井下气液分离器，确保气液分离效率超过90%，有效解决了潜油电泵井在生产运行过程中频繁发生气锁卡泵难题；③潜油电泵同井采注技术能有效降低井筒动液面和井底流压，已累计推广应用50口高产液水淹关停井有效复产和稳定生产，累计增产天然气8 000×10⁴ m³，产出水全部实现井下回注，累计回注20×10⁴ m³，节约水处理费用4 000万元。 结论认为：气井同井采注技术实现了只采气、不产水的目的，为国内外高含水气藏效益开采探索了新途径。

There exists a series of problems in gas wells with high water production, such as high pressure loss in production and transportation system, difficulty in wellbore fluid carrying, low efficiency of surface gathering and transportation, and high cost of produced water treatment. To solve these problems for massive and beneficial development of high water-cut gas reservoirs, a single-well production and injection technology was optimized through numerical simulation and field practice. The results show that, (i) the developed technology of single-well production and injection using electric submersible pump (ESP) not only achieves efficient gas production by deep pumping and strong drainage, but also ensures that the produced water can be reinjected downhole; (ii) the established computational fluid dynamics (CFD) numerical model of the downhole gas-liquid separator of the technology can predict the gas separation efficiency at the outlet of the separator, with an average error of 6.92%; a second-level downhole gas-liquid separator is designed to ensure that the separation efficiency reaches over 90%, effectively solving the problem of frequent gas locking and pump jamming in the operation of ESP wells; and (iii) this technology can effectively reduce the wellbore dynamic liquid level and bottomhole flow pressure; it has been successfully applied to 50 watered-out producers for production resumption and stable recovery, bringing about cumulative increase in gas production by 8 000×١٠⁴ m³, achieving downhole reinjection of all the produced water with a cumulative volume of 20×١٠⁴ m³, corresponding to 40 million yuan saved in water treatment costs. It is concluded that by the ESP single-well production and injection technology, the purpose of producing gas only has been realized through the downhole reinjection of produced water, exploring a new way for beneficially exploiting high water-cut gas reservoirs at home and abroad.