昌探1井优化设计及钻井技术优选

Optimization design and drilling technology optimization for Well Changtan-1

摘要:

随着对松辽盆地北部古中央隆起带基岩钻探，发现储层好坏受裂缝影响较大。因此，在已钻隆探X3井东北部，更靠近徐西断裂带，断层活动明显的裂缝发育区部署了昌探1井。设计完钻斜深5086.90 m，垂深3906.70 m，最大井斜角81.95°。由于松辽盆地基底构造特征极为复杂，受多期构造运动影响，断层类型多样、组合复杂，增加了钻井设计与现场施工的难度。针对该井在钻井过程中可能遇到的难点与风险，在安全可行性分析的基础上，进行了井身结构和井眼轨道优化设计，钻井参数优化以及钻头优选等。实钻效果表明，该井全井平均机械钻速4.20 m/h，钻井周期120.67 d，与邻井相比钻井周期缩短了20.35%，现场施工提速效果明显，为探索该区域基底构造提供了宝贵的经验。

Abstract:

The exploration of the central uplift belt in northern Songliao Basin shows that the reservoir conditions are greatly influenced by fractures. Therefore， Well Changtan-1 was deployed in the northeast of Well Longtan-X3 which is closer to the fracture belt of Xuxi， and where the fault activity is obvious. The total designed depth is 5086.90m with vertical depth of 3906.70m and maximum inclination of 81.95°.The basal structure of Songliao Basin is very complex and the type and composition of the fault is variegated because of multiphase tectonic activities， which increases the difficulty on drilling design and field operations. In view of the difficulties and risks that may be encountered in the drilling process of the well， the safety feasibility analysis is conducted with optimization of the well structure， well trajectory， drilling parameter and drill bit. Field drilling results showed that the average rate of penetration is 4.20 m/h with the drilling period of 120.67d which is shortened by 20.35% compared with nearby wells， increasing drilling efficiency to a great extent. It provides valuable experience for exploration of the basal structure in the region.