摘要
目前陆上油气井钻井工程设计中井控部分主要包括井口装置、试压及常规作业中的井控要求等,并未涉及关井溢流量计算。因此,提出了在钻井工程设计中加入关井井涌余量,并给出一种关井井涌余量的计算方法。同时结合川渝地区A气田LJ-20井?311.1mm井眼钻进工况,就如何在钻井设计中增加关井井涌余量并在现场钻井发生溢流时辅助井控作业进行实例应用。计算结果表明,在给定井涌强度KI值工况下,井眼越深则其井涌余量越小;同一井深条件下,KI值越大则其井涌余量越小。研究认为:在钻井工程设计中加入关井井涌余量是必要的,其能够有效判断现场溢流工况下进行关井作业是否安全;同时应进一步思考如何实现更具现场适用性的动态关井井涌余量值,以便更好地在地层压力难以精准预测的深部地层进行安全钻井。
Currently,the well control in the drilling engineering design of onshore oil and gas wells mainly includes wellhead device,pressure test and well control requirements in conventional operation,and does not involve the calculation of the overflow quantity of shut-in.In this paper,kick tolerance is considered to be added to the design above,and a calculation method of kick tolerance is given.Combined with the drilling condition of?311.1 mm hole of well LJ-20 in gas field A in the Sichuan-Chongqing area,examples were applied to analyze how to add kick tolerance and assist the well control of overflow in drilling site.The calculation results showed that,with the given KI value,the deeper the hole was,the smaller the kick tolerance would be;while at the same depth,the kick tolerance also decreased with the increase of the KI value.Therefore,it is necessary to add the kick tolerance to the design.Thus,whether the shut-in operation with overflow is safe or not can be effectively judged.At the same time,further considering should be given to how to obtain the dynamic kick tolerance of shut-in which is more applicable in the field,so as to assist in safe drilling in the deep formations where pressure is difficult to be predicted accurately.
作者
伍葳
魏云锦
郭建华
付志
杨华建
Wu Wei;Wei Yunjin;Guo Jianhua;Fu Zhi;Yang Huajian(Engineering Technology Research Institute,Southwest Oil and Gas Field Company,Chengdu,Sichuan 610000,China;Development Division,Southwest Oil and Gas Field Company,CNPC,Chengdu,Sichuan 610000,China)
出处
《油气藏评价与开发》
CSCD
2019年第4期47-50,共4页
Petroleum Reservoir Evaluation and Development
关键词
溢流
钻井工程设计
关井井涌余量
井涌强度
overflow
drilling engineering design
kick tolerance of shut-in
strength of kick tolerance
