| 摘要 | 第3-4页 |
| ABSTRACT | 第4页 |
| Chapter One Introduction | 第7-12页 |
| 1.1 Research background | 第7-8页 |
| 1.2 Research Status of Ultra-deep well drilling technology | 第8页 |
| 1.3 Research Status of Drilling String | 第8-10页 |
| 1.4 Research objectives | 第10-11页 |
| 1.5 Overall structure of the thesis | 第11-12页 |
| Chapter Two Soft string model for torque and drag analysis | 第12-22页 |
| 2.1 Soft string model | 第12-20页 |
| 2.2 Drill string buckling | 第20-21页 |
| 2.3 Ultra-deep horizontal well software editor | 第21-22页 |
| Chapter Three Design Method of Drill String For Ultra-Deep Horizontal Well | 第22-34页 |
| 3.1 The problems and challenges existing in ultra-deep horizontal well drilling | 第22-23页 |
| 3.2 Characteristics and configuration design of drilling string | 第23-26页 |
| 3.3 Stress analysis of drill string | 第26-27页 |
| 3.4 Different drill string optimization | 第27-28页 |
| 3.4.1 Subsection optimization configuration steps | 第27-28页 |
| 3.4.2 Integrated optimization design | 第28页 |
| 3.5 Calculation and verification/checking of drilling string strength | 第28-34页 |
| 3.5.1 Static safety factor method | 第28-30页 |
| 3.5.2 Effective safety factor method | 第30-34页 |
| Chapter Four Results and discussion | 第34-44页 |
| 4.1 Subsection design of drilling string in ultra-deep horizontal well | 第34-37页 |
| 4.2 Integrated optimization design of drilling string in ultra-deep horizontal well | 第37-41页 |
| 4.3 Results | 第41-44页 |
| Chapter Five Conclusion and Recommendations | 第44-46页 |
| Conclusion | 第44页 |
| Recommendations | 第44-46页 |
| References | 第46-50页 |
| Acknowledgements | 第50页 |
