Profile Control and Displacement Technique with N2 Foam in High-Temperature and High-Salinity Reservoirs of the Tahe Oilfield
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摘要: 为降低塔河油田边底水高温高盐油藏的含水率，提高产油量，进行了氮气泡沫调驱技术研究。通过评价耐温耐盐发泡剂的性能，优选出了适用于塔河油田高温高盐油藏的发泡剂，并通过室内岩心驱替试验，分析了泡沫注入时机、注入量、注入方式对氮气泡沫调驱效果的影响。结果表明：发泡剂GD-2在130℃下，210 000 mg/L矿化度的情况下，老化10 d后的半衰期可以维持在850 s，耐温耐盐性能较好，适合在塔河油田使用；水驱至含水率为80%~90%时，注入氮气泡沫采收率提高幅度最大；氮气泡沫的注入量为0.5倍孔隙体积时，采收率提高幅度最大；段塞方式注入氮气泡沫的采收率提高幅度比连续注入方式和气液交替注入方式大。塔河油田TK202H井组的现场试验表明：注入氮气泡沫进行调驱后，3口生产井的产油量得到提高，含水率得到降低。这表明，塔河油田边底水高温高盐油藏采用氮气泡沫调驱技术可以降低含水率，提高油井产量。Abstract: To reduce water cut and enhance the oil production of high-temperature and high-salinity (HTHS) reservoirs with edge or bottom water in the Tahe Oilfield, the applicability of profile control and displacement technique with N2 foam was discussed. Through evaluation, HTHS-resistant foaming agents suitable for the HTHS reservoirs in the Tahe Oilfield were selected. Through core displacement tests in the laboratory, the impacts of timing, volume and mode of foam injection on the performance of the proposed technique were investigated. Results show that foaming agent GD-2 demonstrated satisfactory performance under 130℃ and a salinity of 210,000 mg/L with a half-life of 850 seconds after aging for 10 days. In addition, the highest increase in recovery could be achieved by foam flooding with a water cut of 80%-90% in water flooding. The highest increase in recovery was also observed by foam flooding with a volume of injected foam at 0.5 PV. Intermittent injection exhibited better performances than continuous injection and alternative injection of gas and liquid. Field application in TK202H cluster wells demonstrated that all three producers had a higher output and water cut reduction after profile control and displacement with N2 foam. In conclusion, the proposed profile control and displacement technique with N2 foam can effectively reduce water cut and enhance oil production in HTHS reservoirs with edge/bottom water in the Tahe Oilfield.
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