普光气田大湾区块完井工艺技术

四川盆地普光气田大湾区块在开发中既有与气田主体相似之处，又有许多自身的特点，前者储层非均质性更强。因此，针对裸眼完井和套管射孔完井两种不同的完井方式，优化了不同的酸压、生产一体化管柱结构；配套了补偿式传爆、高精度延时传爆和低碎屑射孔弹3项射孔技术；形成了裸眼井钻塞、通井，套管井酸浸等配套井筒处理技术；采用长井段非均质储层分段酸压改造技术，有效改善了储层物性；同时完善了高含硫气井作业井控管理制度。现场施工作业8口井，首次实现国内高含硫水平井分段储层改造，为大湾气井的顺利投产提供了技术保障。

Well completion technologies at the Dawan Block in the Puguang Gas Field

The gas recovery and exploitation in the Dawan operating block is quite similar to that in the major zones in the Puguang Gas Field, but is also meeting other challenges due to the stronger heterogeneity of gas pay zones there with specific characteristics. In view of this, two totally different methods of open hole completion and casing completion are adopted to optimize different structures of tubing strings with acid fracturing integrated with gas production. Moreover, three perforating techniques are added including the compensation mode explosion, high accuracy delay blasting, and perforation with fine grained debris. Such wellbore processing techniques are formed as cement plug drilling and wiper tripping under open hole condition and acid leaching in a cased well. The staged acid fracturing treatment is chosen in a long lateral horizontal well for the stimulation of reservoirs with strong heterogeneity, the petrophysical properties of which can also be effectively improved. In addition, the well control management system is completed for the operation of high sulfur gas wells. The above mentioned technologies have been successfully applied in 8 wells in this block, and for the first time in China, the staged fracturing stimulation treatment has been accomplished for high sulfur gas horizontal wells, providing robust technical support for Dawan gas wells to be smoothly put into production.