超深水超浅层储层无隔水管钻井取心难点与对策  

Difficulties and countermeasures of core drilling without riser in ultra‑deep water and ultra‑shallow reservoirs

作　　者：陈浩东 吴艳辉 马传华 黄洪林 罗鸣 李文拓 代锐 廖高龙 CHEN Haodong;WU Yanhui;MA Chuanhua;HUANG Honglin;LUO Ming;LI Wentuo;DAI Rui;LIAO Gaolong(Hainan Branch of CNOOC(China)Co.,LTD.,Haikou Hainan 570100,China;Key Laboratory of Deep Sea Deep Formation Energy Engineering of Hainan Province,Chengmai Hainan 571099,China)

机构地区：[1]中海石油(中国)有限公司海南分公司,海南海口570100 [2]海南省深海深层能源工程重点实验室,海南澄迈571099

出　　处：《钻探工程》2024年第6期119-124,共6页Drilling Engineering

基　　金：中海油“十四五”重大科技项目课题“深水超深水复杂井安全高效钻完井关键技术”(编号:KJGG2022-0201)。

摘　　要：超深水超浅层(简称“双超”)储层钻井取心作业难度大,成功率低,作业费用高,可供参考经验少。对此,开展了无隔水管条件下的“双超”储层钻井取心难点分析,并提出了相应技术对策,形成了一套“双超”储层高效取心方案。研究结果表明,在“双超”环境下,储层以未胶结、松散泥质-粉砂岩为主,地层疏松,钻井取心作业面对着取心筒“堵心”、排量和钻压控制难度大、超深水作业费用高等难题与挑战。优选Rb-8100型全封闭式保形取心工具和HSC043-8100型取心钻头,配合小排量(200 L/min)、低转速(15~40 r/min)、阶梯式钻压(2~10 t)的小参数模式,自制网兜将钻头处海水进行分流并保护底部岩心。在南海“双超”气田开展了无隔水管钻井取心先导试验,取心收获率达100%。实现了“双超”储层高效钻井取心,同时为“双超”气田的后期开发奠定了重要的基础。In the ultra⁃deep and ultra⁃shallow reservoirs(“double ultra”for short),problems exist such as difficult coring operation,low success rate,high operation cost,and lack of reference experience.In view of this,the analysis of the coring difficulties without risers is carried out,the corresponding technical countermeasures are put forward,and a set of efficient coring scheme is formed.The results show that in the“double ultra”environment,the reservoir is dominated by unconsolidated and loose argillous sandstone,and the coring operation faces the problems and challenges of“blocked core”,the difficulty of controlling displacement and bit weight,and the high cost of ultra⁃deep water operation.The Rb-8100 fully enclosed conserved coring tool and HSC043-8100 coring bit are selected,corporated with small perameter mode of small displacement(200L/min),low speed(15~40r/min)and stepped bit weight(2~10t).The self⁃made net diverts seawater at the bit and protects the bottom core.The pilot test of riserless coring was carried out in“double ultra”gas field in South China Sea,and the core recovery reached 100%.It is the first time to realize the efficient coring operation in“double ultra”reservoirs,and lays an important foundation for the later development of ultra⁃deep and ultra⁃shallow reservoirs gas field.

关 键 词：超深水超浅层储层 疏松地层 海洋钻井取心 保形取心工具 无隔水管作业 

分 类 号：TE921[石油与天然气工程—石油机械设备] P634.4[天文地球—地质矿产勘探]