抗温抗盐复合缓蚀起泡剂的室内评价及应用

天然气气井开发中后期因地层能量降低,携液能力下降,致使产水气井井筒内积液严重,影响气井产能。对此,需要采取泡沫排水措施以维持气井正常生产。川渝地区大多为含H2S和CO2的酸性气田,在进行泡排的同时需要进行腐蚀防护。因此,开展了复合缓蚀起泡剂的评价研究及应用,以实现在酸性气藏开采中的泡排和防腐联作。对复合缓蚀起泡剂CT5-20的性能进行了评价研究,证明该复合缓蚀起泡剂不仅抗温抗盐(150℃、300g/L矿化度)、泡排性能优异,而且具有较好的腐蚀防护性能。用该缓蚀起泡剂在重庆气矿X井进行现场试验,取得了较好的缓蚀泡排效果,说明CT5-20复合缓蚀起泡剂的应用可以实现高温、高矿化度酸性气井的泡排防腐联作。

Laboratory evaluation and application of corrosion inhibition and foaming compound agent with temperature-salt resistant

As more and more mining of acidic gas reservoir, downhole corrosion prevention and corrosion monitoring are increasingly important. The traditional downhole coupon corrosion monitoring is to hang a piece of coupon installed inside a stationary tubing nipple, but the coupon must be into and up with the tubing in the well. Because the monitoring depth is fixed, the result and analysis of downhole coupon corrosion monitoring are limited by the workover job opportunity. Aiming at the faults of conventional downhole corrosion monitoring as well as the demand of current locale monitoring, a tool for gas well downhole corrosion monitoring was researched and developed independently. The result of indoor evaluation and field test indicated that the tool has the advantages of reliable performance and convenient implement, more real and intuitive evaluation of downhole corrosion, a wide practical range, as well as convenient adjustment for the depth of corrosion monitoring, adjustable number and type, etc. The successful application provides a direct basis for the downhole corrosion inhibition of gas wells and selecting reasonable workover job opportunity, greatly reduces the cost of downhole corrosion monitoring of gas well and overhaul operations, which has an important meaning for gas well safety production.