渤海油田南部区域浅层预防新井眼措施探析

Optimization Measures for Shallow Prevention of New Boreholes in the Bonan Area of Bohai Oilfield

近些年渤海油田南部区域开展大规模油气田开发,该区域开发调整项目主要目的层位为新近系明化镇组,井型以大斜度定向井和水平井为主。在开发调整钻井过程中,丛式井平台定向井轨迹控制一般要求从浅部地层开始预斜定向钻进,该区域浅部地层以松软砂泥岩为主,岩屑不成型易分散,在钻进过程中易形成不规则扩大井径,钻具在下划眼修整井壁和下钻过程中极易遇阻出新井眼。针对该区域地层特性和井型特征,结合现场实际作业经验,从定向轨迹优化,工程参数调整,钻井液方案改进等方面制定一系列预防措施,取得了良好效果,既有效降低了出新井眼风险,也兼顾了该区域油田高效开发要求。

In recent years,In recent years,large-scale oil and gas field development has been carried out in the southern region of the Bohai Oilfield.The main objective of the development adjustment project in this area is the Neogene Minghuazhen Formation,with well types mainly consisting of high angle directional wells and horizontal wells.In the process of development and adjustment drilling,the trajectory control of directional wells on cluster well platforms generally requires pre inclined directional drilling starting from the shallow strata.The shallow strata in this area are mainly composed of soft sand and mudstone,and the rock cuttings are not formed and easily dispersed.During the drilling process,irregular enlargement of the wellbore is easy to form,and the drilling tool is easily blocked during the process of trimming the wellbore and drilling.A series of preventive measures have been developed based on the geological characteristics and well type characteristics of the region,combined with on-site practical operation experience,from the aspects of directional trajectory optimization,engineering parameter adjustment,and drillingfluid scheme improvement.Good results have been achieved,effectively reducing the risk of new wellbore development and taking into account the requirements of efficient oilfield development in the region.