大港油田滨海地区钻井地质风险分析及应对措施  

Drilling geological risk analysis and countermeasures in the coastal area of Dagang Oilfield

作　　者：聂芬意 姜宁宁[1] 李敏 王博[1] 赵子豪 何成山 NIE Fenyi;JIANG Ningning;LI Min;WANG Bo;ZHAO Zihao;HE Chengshan(Research Institute of Exploration and Development,PetroChina Dagang Oilfield Company,Tianjin 300280,China;The Fifth Oil Production Plant,PetroChina Dagang Oilfield Company,Tianjin 300280,China;CNPC Offshore Engineering Company Limited,Beijing 100028,China;Exploration Enterprise of PetroChina Dagang Oilfield Company,Tianjin 300280,China)

机构地区：[1]中国石油大港油田公司勘探开发研究院 [2]中国石油大港油田公司第五采油厂 [3]中国石油集团海洋工程有限公司 [4]中国石油大港油田公司勘探事业部

出　　处：《录井工程》2024年第2期147-152,共6页Mud Logging Engineering

摘　　要：为确保大港油田滨海地区钻井安全,并最大限度提升钻井时效,从该地区已钻井发生的钻井复杂情况入手,分析引起该区域钻井风险的主要地质因素及原因,并提出相应的解决措施。研究表明:(1)研究区新近系馆陶组地层埋深较浅,岩石结构松散,底部发育不整合面,古近系沙河街组地层埋藏较深,原始地层压力高,气油比高,这些地质特征导致该区钻井风险较高;(2)研究区钻井复杂情况主要分为两类,一是漏失型,主要是井漏,二是溢出型,包括气侵、溢流和井涌等;(3)研究区漏失型钻井复杂情况的地质风险主要是馆陶组底部弱固结的砂砾岩及馆陶组底部的不整合面,溢出型钻井复杂情况的地质风险主要是沙一段异常高压和丰富的含气量;(4)应对漏失型钻井复杂情况地质风险的主要措施是排查馆陶组底部砂砾岩的空间分布,应对溢出型钻井复杂情况地质风险的主要措施是及时测试地层压力,并据此在钻井过程中实时调整钻井液密度。该研究成果可为滨海地区及地质条件相似的其他地区的钻井施工提供借鉴作用。In order to ensure the drilling safety in the coastal area of Dagang Oilfield sag,and improve the drilling efficiency to the maximum extent,this article starts with the complex drilling situation in the coastal area,analyzes the main geological factors and reasons that cause drilling risks in this area.Meanwhile,corresponding solutions are proposed.The research shows that:(1)The Neogene Guantao Formation in the research area has shallow buried depth,loose rock structure and unconformities developed at the bottom.The Paleogene Shahejie Formation has deep burial,high original formation pressure and high gas⁃oil ratio,which lead to high drilling risks in this area(.2)The complex situation of drilling underground can be mainly divided into two categories.One is leakage type,mainly well leakage.The other is overflow type,including gas invasion,overflow,and well kick.(3)The geological risks of complex well conditions in the research area are mainly the weakly consolidated gravel at the bottom of the Guantao Formation and the unconformity surface at the bottom of the Guantao Formation.The geological risk of overflow type complex well conditions mainly lies in the abnormal high pressure and abundant gas volume of the Shahejie Formation.(4)The measures to deal with the geological risks of complex well conditions caused by leakage mainly lie in investigating the spatial distribution of sand and gravel at the bottom of the Guantao Formation.The measures to deal with the geological risks of overflow type complex well conditions mainly lie in timely pressure measurement,and adjust the drilling fluid density in real time in the process of drilling.The research results of this article can provide reference for drilling work in coastal areas and areas with similar geological conditions.

关 键 词：地质风险 钻井复杂 井漏 溢流 井控安全 应对措施 歧口凹陷 滨海地区 

分 类 号：TE132.1[石油与天然气工程—油气勘探]