Managed Pressure Drilling Technique in the Well Y26ST of YD Oilfield
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摘要: YD油田Y26井在钻进Kazhdumi组地层时有大量沥青和硫化氢侵入,造成井涌与井漏并存的井下复杂情况,采取多种方法处理未见效果,被迫临时弃井.Y26ST井为Y26井的侧钻井眼,基于原井眼沥青侵处理过程中获得的经验与教训,针对侧钻要求,开展了控制压力钻井技术适应性评价和控制压力钻井风险分析,并形成了Y26ST井控制压力钻井技术方案.侧钻过程中,根据实际情况,依次采用了井底恒压和加压泥浆帽2种控制压力钻井方法,有效控制了井筒内的压力分布,降低了沥青侵、油气侵和井漏等井下复杂情况对钻井工程的危害.Y26ST井顺利钻穿Kazhdumi组湿沥青层段,成功下入尾管并固井.控制压力钻井技术在Y26ST井的成功应用,为活跃沥青层长裸眼安全钻进提供了新的技术手段.Abstract: Large volume of bitumen and hydrogen sulfide flew into Well Y26 in the YD Oilfield while drilling into the Kazhdumi Formation, which resulted in the complexity of coexisting well kicks and lost circulation. Some methods were used to kill the well, but they were all unsatisfactory. Finally, the well was temporarily abandoned. Well Y26ST is a sidetracked hole of Well Y26. On the basis of experience gained from handling the bitumen in the original borehole, assessments for applicability and risks related to managed pressure drilling were conducted, so as to generate a drilling program for Well Y26ST. To cope with the kick of formation fluids during drilling, the methods both constant bottom hole pressure and pressured mud cap were used during sidetracking operation, the borehole pressures was controlled effectively, the invasion of wet bitumen, heavy oil and gas was minimized, lost circulation and other troubles in drilling were also avoided. Well Y26ST was penetrated the wet bitumen interval and cemented with liner successfully in Kazhdumi Formation,which shows that success of managed pressure drilling in Well Y26ST can provide a reference for drilling a long open-hole interval within active bitumen formation.
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Keywords:
- managed pressure drilling /
- mud cap /
- bottom hole pressure /
- Well Y26ST /
- YD Oilfield
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