高滤失固结堵漏技术在足203H5平台的应用

Application of fast filtration consolidation plugging technology in Zu 203H5 platform

针对渝西足203H5平台三开上部须家河组、嘉陵江组裂缝发育,恶性漏失频发,承压跨度大等难题,优选以“聚集效应”和“固化增强”为核心的高滤失固结堵漏技术,对3 mm以上裂缝辅助2%~3%多孔泡沫铝颗粒,提高高滤失材料在漏失通道的驻留效率。室内评价结果表明:堵漏浆浓度为50%情况下,滤失时间小于25 s,滤饼强度(70℃养护24 h)大于6 MPa,静置30 min清液析出量小于15%,封堵承压能力大于4 MPa,养护后承压能力均超过20 MPa,且对现场钻井液无污染。根据高滤失固结堵漏的技术特点,现场优化了平推堵漏工艺,并在足203H5平台3口井应用4井次,承压堵漏成功率75%,承压能力均达到当量密度1.90 g/cm^(3)以上。

In view of the problems of Xujiahe and Jialingjiang formations of Zu 203H5 platform in western Chongqing,such as the multiple fractures,the frequent occurrence of malignant leakage and the large bearing span,the fast filtration consolidation and plugging technology with“aggregation effect”and“solidification enhancement”as the core is optimized.For fractures of more than 3 mm,2%-3%porous aluminum foam particles are assisted to improve the resident efficiency of fast filtration materials in the leakage channel.The laboratory evaluation showed that,when the dosage was 50%,the filtration time was less than 25 seconds,the strength of filter cake(curing at 70℃for 24 hours)was more than 6 Mpa,the precipitation of clear liquid was less than 15%after standing for 30 minutes,the sealing pressure was more than 4 Mpa,and the pressure bearing capacity after curing was more than 20 Mpa,and no pollution to drilling fluid on site.According to its technical characteristics,the horizontal pushing and plugging technology was optimized on the spot,which was applied for 4 times in 3 wells of Zu 203H5 platform.The success rate of pressure-bearing and plugging was 75%,and the pressure-bearing capacity was above 1.90 g/cm^(3).