大牛地气田欠平衡水平井钻井技术

Drilling Technology of Underbalanced Horizontal Well in Daniudi Gas Field

针对鄂尔多斯北部地区低压低渗地层,常规钻井工艺技术一直是制约钻井效率和及时发现有效保护油气层、影响油气产能的重要因素。为此,近几年在鄂北工区大牛地气田进行了欠平衡钻井工艺和水平井钻井技术的推广应用与研究。介绍了欠平衡钻井技术工艺概况、优点及在大牛地气田水平井中的应用。业已显示,欠平衡钻井技术具有及时发现和有效保护油气层、提高机械钻速、及时评价低压低渗油气层的特点,同时提出了应用中存在的问题和技术难点。

Conventional drilling technology restricts drilling efficiency and is unfavorable to protect oil and gas formation in low pressure and low permeability reservoir.Underbalanced drilling and horizontal drilling were analyzed and applied in Daniudi gas field.The paper introduced the underbalanced drilling technology about the process overview,advantages and the application in horizontal well of Daniudi gas field.It was showed that underbalanced drilling technology can provide timely discovery and effective protection of oil and gas formation,improvement of drilling efficiency and evaluation on oil and field formation with low pressure and low permeability.The problems and technical difficulties in application were also put forward.