单筒三井钻井技术在文昌油田的应用

Application of triple hole splitter wellhead drilling technology in Wenchang Oilfield

摘要:

文昌13-2油田B台位于南海西部珠江口盆地，属于海上边际小油田。受槽口数量及钻机能力限制，经过综合评估，并结合文昌13-2油田实际开发需求，首次在简易导管架利用修井机从?914.4 mm隔水套管内同时下入3根?339.7 mm无接箍套管，并采用相关技术措施，以便在后续作业中利用一个槽同时实现3口井独立的钻完井作业。以该槽口作业的B20、B22和B23井为例，系统介绍了单筒三井设计原理、槽口选择、定向井轨迹设计、井身结构设计、表层套管下入、表层套管固井等关键技术。单筒三井关键技术在文昌13-2油田成功应用，对海上油气开发中，提高海上钻井槽口利用率及有效降低海洋工程建设成本提供参考和建议。

Abstract:

Block B of Wenchang 13-2 Oilfield is located in Pearl River Mouth Basin in the west of the South China Sea， and belongs to the offshore marginal small oil field. With the limitation of the number of slots and the rig capacity， and after comprehensive evaluation and in consideration of the actual development needs of Wenchang 13-2 Oilfield， three sections of ?339.7 mm flush joint casing were simultaneously run in ?914.4 mm conductor for the first time so as to realize the drilling and completion job of three wells independently from one slot. Taking the drilling of the B20， B22 and B23 wells from the slot as example， this paper systematically introduces the key triple hole splitter wellhead technology， including design principles， slot selection， directional well trajectory design， casing program design， surface casing running， surface casing cementing， etc. These key technologies have been successfully applied in Wenchang 13-2 Oilfield， providing reference and suggestions for improving the utilization rate of slots while effectively reducing the construction cost of offshore works in offshore oil and gas development.