墨西哥EPC区块优快钻井技术

Slimhole Horizontal Drilling Technology for EPC Block in Mexico

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.