欠平衡钻井技术在大港油田古潜山勘探中的作用

The Important Role of Under-balanced Drilling Technology for the Exploration in Buried-hills in Dagang Ollfield

大港探区古潜山的勘探历经多年,从沧县隆起、埕宁隆起到盆地内部,已钻遇奥陶系古潜山井51口,少数井见油气显示,但未取得勘探的实质性突破。受地下地质条件影响的同时,钻井工艺技术的落后也是其影响因素之一。为此本文从地质—钻井工艺相结合出发,探讨欠平衡钻井技术在大港古潜山勘探中所发挥的重要作用。

Excepting oil/gas shows found in a few wells, no substantial breakthroughs, were achieved in the petroleum exploration in Dagang buried-hills during the past tens of years, regardless of 51 wells drilled into Ordovician buried-hill, which distributed from Cangxian uplift, Chengning uplift to Huanghua basin. This is due to the complicated geological conditions, as well as the underdeveloped drilling technology. This paper, based on the combination of geology and drilling technology, discussed the important role of under-balanced drilling technology for the exploration in buried-hills in Dagang oilfield.