1. The author pointed out that tubing anchor can not only control the tubing flex , but also improves force status , prolong the using life of tubing strings . 指出油管锚（油管张力锚除外）不仅可以控制管柱的伸缩，而且可以改善管柱的受力状况，延长油管的使用寿命。
2. Glass connection, tubing constant pressure connection, single constant connection and tubing blanking plug are main tubing internal seal tool. 玻璃接头、油管定压接头、油管单向定压接头和油管堵塞器是目前各油气田使用较普遍的油管内密封工具。
3. Glass connection, tubing constant pressure connection, single constant connection and tubing blanking plug are main tubing internal seal tool. 玻璃接头、油管定压接头、油管单向定压接头和油管堵塞器是目前各油气田使用较普遍的油管内密封工具。
4. Glass connection, tubing constant pressure connection, single constant connection and tubing blanking plug are main tubing internal seal tool. 玻璃接头、油管定压接头、油管单向定压接头和油管堵塞器是目前各油气田使用较普遍的油管内密封工具。
5. Glass connection, tubing constant pressure connection, single constant connection and tubing blanking plug are main tubing internal seal tool. 玻璃接头、油管定压接头、油管单向定压接头和油管堵塞器是目前各油气田使用较普遍的油管内密封工具。
