摘要
墨西哥EPC区块在开发中后期,为节约成本,所有生产井均设计为小井眼中短半径水平井,采用氮气欠平衡钻井技术。该区块定向施工中存在造斜点浅、造斜率高、水平段较长等技术难点。现有的动力钻具在高造斜率情况下无法进行复合钻进,造成频繁起下钻更换钻具,钻井周期延长。为此,研制了可进行大角度复合钻进的动力钻具。目的层段采用充氮气欠平衡钻进,无法采用常规随钻测量仪器进行随钻测量,选用了不受钻井介质影响的电磁波无线随钻测量仪。采用大角度可复合钻进的动力钻具和电磁波无线随钻测量仪,通过优选钻头和优化钻井液性能,再配合合理的工程技术措施,形成了适用于EPC区块的优快钻井技术。现场应用表明,该优快钻井技术实现了从造斜到完钻一趟钻完成的目标,解决了频繁起下钻的问题,提高了钻井速度,缩短了钻井周期,降低了钻井成本。
In order to save costs in developing EPC Block of Mexico,all producing wells were designed to be slimhole middle-short radius horizontal wells using the nitrogen-filled underbalanced drilling technology.There are lots of technical difficulties,such as shallow KOP,high build-up rate and long horizontal section.The existing PDM can＇t make composite drilling under high build-up rate which results in frequent tripping to replace the BHA and prolongs drilling cycle.Therefore,the large bend angle PDM that can complete composite drilling was developed.Since the horizontal section using nitrogen-filled underbalanced drilling,the conventional MWD couldn＇t be used.The E-LINK MWD was chosen to measure the well trajectory.Optimal and fast drilling technology for EPC Block of Mexico included the big bend angle PDM rotary drilling,E-LINK MWD survey,optimization of the bit and mud property.Field application showed that this technology solved the problem of frequent trip,improved ROP,shortened drilling cycle,and reduced drilling cost.
出处
《石油钻探技术》
CAS
北大核心
2011年第5期53-57,共5页
Petroleum Drilling Techniques
