油基钻井液与地层流体重力置换实验研究  

Study on oil-based drilling fluid gravity displacement experiment

作　　者：赵鹏 马永乾 樊洪海[2] 段光辉 陶振宇 ZHAO Peng;MA Yong qian;FAN Hong hai;DUAN Guang hui;TAO Zhen yu(Drilling Technology Research Institute of Sinopec Shengli Petroleum Engineering Co.,Ltd,Dongying Shandong,257091,China;China University of Petroleum(Beijing),Beijing,102249,China)

机构地区：[1]中石化胜利石油工程有限公司钻井工艺研究院,山东东营257091 [2]中国石油大学(北京),北京102249

出　　处：《内蒙古石油化工》2024年第8期96-102,共7页Inner Mongolia Petrochemical Industry

基　　金：中石化胜利钻井院研究项目“深水控压钻井水力精确计算理论模型与压控特性实验研究”(编号:1020001-22-ZC0613-0044)。

摘　　要：碳酸盐岩地层连通性较好,多发育裂缝溶洞型地层,经常发生重力置换式溢流,溢流与漏失并存,难以处理。在一些区块中,由于油与油基钻井液发生重力置换溢流,常导致钻井液密度降低,无法平衡井底压力,造成恶性溢流事故。为了及时处理溢流事故,实现安全钻井,需要掌握油与油基钻井液发生地层重力置换的机理,从理论出发指导现场处理重力置换溢流。因此,基于自主研制的井筒-裂缝-地层重力置换实验装置,开展重力置换实验,证明了重力置换现象的存在;配置油基钻井液,开展油基钻井液与油重力置换实验,发现由于地层原油与油基钻井液发生反应,会导致油基钻井液密度与粘度明显下降,导致油基钻井液无法平衡井底压力,影响钻井进程,实验对现场处理重力置换溢流具有指导意义。Carbonate rock formation has good connectivity,more developed cracks and karst cave for-mation,gravity displacement overflow often occurs,overflow and leakage coexist,it is difficult to deal with.In some blocks,the gravity displacement overflow of oil and oil-based drilling fluid often leads to the reduction of drilling fluid density,which cannot balance the bottom pressure,resulting in malignant o-verflow accidents.In order to deal with overlow accidents in time and realize safe drilling,it is necessary to master the mechanism of formation gravity replacement between oil and oil-based drilling fluid,and guide the site to handle gravity displacement overflow from the theory.Therefore,based on the self-de-veloped gravity displacement experiment of the wellbore-fracture-formation gravity displacement exper-imental device,and the oil-based drilling fluid cannot balance the oil-based drilling fluid,it is found to affect the drilling process,the experiment has guiding significance for the treatment of gravity displacement overflow.

关 键 词：重力置换 实验 油基钻井液 缝洞型储层 

分 类 号：TE242[石油与天然气工程—油气井工程]