涠洲油田随钻井壁修整工艺的应用

海上油气田的开发以丛式井台的定向井为主,受地层非均质性、井眼清洁等条件限制,定向钻进中易产生不规则井壁,大斜度井易形成岩屑床等,导致起下钻阻卡、套管下入困难等问题。为此,在扶正翼上敷焊PDC切削齿,增加划眼和破坏岩屑床功能,形成随钻修整井壁的划眼器,改善井眼质量,进而实现钻井效率的提升。南海西部涠洲油田的现场应用表明,该工艺能够有效清刮渗透性砂岩井壁的厚泥饼、修整PDC钻头在软硬交错地层形成的不规则井壁,破坏大斜度井的岩屑床,减少短起下钻及通井次数,从而提高钻井效率。

Application of wall reaming while drilling technique in Weizhou oilfield

The development of offshore oil and gas fields is dominated by directional wells with cluster platforms. Restricted by formation heterogeneity and well bore cleanliness, irregular well bore lining and cuttings bed are easily formed in directional drilling, which lead to problems such as stuck in tripping and difficulty in casing running. For this reason, PDC cutting teeth are welded on the centralized wing to increase the function of scratching and destroying the cuttings bed, forming a scratch device for repairing the wall while drilling, improving the quality of the well bore, and then improving the drilling efficiency. Field application in Weizhou oilfield in the west of south China sea shows that this technology can effectively wipe thick mud cake from permeable sandstone well bore, repair irregular well bore lining formed by PDC bits in soft and hard staggered formation, destroy cuttings bed of highly inclined wells, reduce the number of short trips and through wells, and improve drilling efficiency.