威远区块基于地质工程一体化的井漏风险识别技术研究

Research on well leakage risk identification technology based on geo-engineering integration in Weiyuan Block

为了应对威远页岩气田深层的茅口组、龙马溪组断层较发育,裂缝分布复杂,普通的地震解释方式难以准确识别井漏风险的问题。降低井漏事故发生率,研究了地质工程一体化技术在钻井领域的应用,提出了威远地区地质工程一体化的井漏风险识别技术,对重点地层进行井震融合精细化建模,选取最大似然属性技术对断层进行识别,优选钻具组合,配合采用现场+远程联动保障技术,实现避钻井漏风险地层。现场作业结果表明,地质一体化井漏风险识别技术对高风险断层可以做到有效预测,规避井漏风险,应用地质工程一体化技术后的事故复杂率下降了14个百分点,确保了钻井作业的安全高效,为威远区块井漏问题打造了施工样板,相关成果可为同类工程问题提供借鉴。

In order to cope with the deeper faults of Maokou Formation and Longmaxi Formation in Weiyuan shale gas field,which are more developed and have complicated fracture distribution,and it is difficult to accurately identify the risk of well leakage by ordinary seismic interpretation,and to reduce the rate of well leakage accidents,the application of geo-engineering integration technology in drilling field was studied,and the geo-engineering integration technology of well leakage risk identification in Weiyuan was put forward,and the well seismic integration refinement modeling for the key stratums was carried out.Maximum likelihood attribute technology was selected to identify faults,drilling tool combinations was optimized,and on-site+remote linkage guarantee technology to avoid drilling well leakage risk formations was adopted in conjunction.The results of field operation showed that the geological integrated well leakage risk identification technology can effectively predict high-risk faults and avoid well leakage risks,and the accident complexity rate after applying the geo-engineering integration technology decreased by 14 percentage points,ensuring the safety and high efficiency of the drilling operation,and creating a construction model of well leakage problem in Weiyuan Block,and the relevant results can provide reference for similar engineering problems.