全通径分段改造工艺在超深碳酸盐岩水平井中的应用

Application of Full-Bore Segment Transforming Technology in Ultra-Deep Horizontal Well with Carbonate Rocks

全通径分段改造工具在超深井分段改造中的应用工具主要由基管、裸眼封隔器、压控式筛管和投球式筛管组成。全通径分段改造工具通常第一级使用投球式筛管,其它级使用压控式筛管实现改造工具全通径,以满足改造和后期作业的需要。通过优化,一个压力级别可以控制两级或三级压控式筛管,实现水平井多级分段改造。该工具在塔里木塔中碳酸盐岩气田应用28井次,最深水平井达到7 810m,分段级数最多达到11级,改造规模最大达5 997方,分段改造后效果显著,平均产量折油气当量90.6t。全通径分段改造技术为其它类似储层分段改造提供了新的有效途径。

Full-bore segment transforming tool consists of base tube,open-hole packer,ball-type sieve tube used in the first pressure level and pressure-controlled sieve tube used in the other pressure levels.Through the optimization of the tool,one pressure level can control two or three levels of pressure-controlled sieve tube in multistage segment transformation of horizontal wells.The application of the tool in Tazhong carbonatite gas field in Tarim achieves a sound effect and provides a new and effective way of segment transformation of other similar reservoirs.