元坝超深高含硫大斜度气井射孔技术

Perforating in ultra-deep and highly deviated wells with high sulfur gas in Yuanba gas field

曹阳 史雪枝 伍强 刘刚 金阳

CAO Yang SHI Xuezhi WU Qiang LIU Gang JIN Yang

中国石化西南油气分公司工程技术研究院，四川德阳　618000

Engineering Technology Institute of Southwest Petroleum Branch, SINOPEC, Deyang 618000, China

元坝气田主力气藏埋深在7 000 m左右，温度最高达157 ℃，射孔时面临高温带来的射孔器材性能不稳定等一系列难题。通过采用钻井液中射孔、及时上提射孔管柱、分单元延时起爆、增设定位销等措施避免了卡枪、管柱脱落等问题；耐高温射孔弹、导爆索、传爆管、延时装置等一系列工具的灵活使用保证了射孔成功率和气层打开程度。采用以上措施对井底温度150 ℃、井斜79.14°的元坝YB10-C1井162 m射孔段成功实施了射孔作业，发射率99.7%，有效地沟通了地层，为同类井的射孔作业提供了借鉴。

With about 7000 m depth of main gas reservoir and as high as 157 degree in temperature in Yuanba gas field, perforation is comfroted with a series of problems such as unstable performance of perforation equipment because of high temperature. Through perforating in drilling fluids, timely pulling out perforating string, sub-unit delay blasting and using of locating pin, problems such as gun block, string column off are avoided. The flexible use of a series tools including heat-resistant perforation bombs, detonating fuse, booster, and delay devices are to ensure perforation success rate and the open extent of the gas reservoir. Above measures are successfully implemented in Well YB10-C1 with 162 meters perforated interval, in which the bottom-hole temperature is up to 150 ℃, and the highest deviation is 79.14 ° . The perforating emission rate is about 99.7 percent, and the formation is effectively communicated. The successful treatment provides reference of perforation operation in the same kind wells.