涠洲12-1北油田涠二段井壁稳定性技术

Technology research on sidewall stability of Weizhou12-1 in Wei2 area of north oilfield

黄凯文 刘书杰

HUANG Kai-wen LIU Shu-jie

中海石油中国有限公司湛江分公司钻井部, 广东湛江 524057 中国海洋石油研究中心, 北京 100027

控制井壁失稳是北部湾涠西南油田群钻井过程中遇到的一个难题。在钻井过程中往往出现地层垮塌、井漏、卡钻等井下复杂事故,钻井时效低、报废钻具多,作业成本居高不下,该问题近年来一直未能得到根本的解决。在涠西南油田群第1批井的钻井作业中,出现了较多的复杂情况及井下事故,作业进度严重滞后。而在进行第2批井作业之前,通过对前面已钻井的现场资料分析总结,同时开展了大量的室内实验和理论研究,进一步摸清了造成该地区井壁失稳的主要机理,并提出了具体的技术措施。通过研究成果的现场应用,该油田后期的钻井过程中井下复杂事故发生率大幅度地降低,从而解决了十多年困扰本地区钻井的井壁失稳难题。以涠二段井壁为例,介绍了井壁稳定技术的研究与应用,为同类油田控制井壁失稳提供了经验。

Controlling sidewall instability is a problem in drilling process of Weixinan oilfield group in Beibu gulf.Underground complicated accidents such as formation collapse,well lose,drill pipe sticking,and so on appears frequently.Therefore,the problem,which is low efficiency,many disabled drilling tool and high operation cost,hasn’t been solved in recent years.In the drilling operation of the first batch wells in Weixinan oilfield group,quite excessive complicated conditions and underground accidents happens,operation progress lagging severely.However,before the operation of the second batch wells,by analysis and conclusion of present data from previous drilling well,meanwhile developing many laboratory experiments and theoretical researches,the main mechanism causing the sidewall instability in this area is investigated and specific technological measures are proposed.By field application of research results,the incidence of underground complicated accidents in oilfield late drilling remarkably decreased,therefore,the sidewall instability problem disturbing the cycle of drilling in this area more than ten years is solved.In this paper,taking Wei2 area sidewall for example,research and application of sidewall stability technology is introduced,which offers precious experience for such oilfield in controlling sidewall instability.

10.3969/j.issn.1000-7393.2007.06.003