新型储层钻井完井一体化工作液设计及性能评价  

Design and Evaluation of an Integrated Drilling and Completion Fluid

作　　者：许洁 许林 李习文 寇磊 许明标[3,4] XU Jie;XU Lin;LI Xiwen;KOU Lei;XU Mingbiao(Haikou Marine Geological Survey Center,China Geological Survey,Haikou,Hainan 571127;School of Petrochemical Engineering and Environment,Zhejiang Ocean University,Zhoushan,Zhejiang 316022;College of Petroleum Engineering,Yangtze University,Wuhan,Hubei 430100;Cooperative Innovation Center of Unconventional Oil and Gas,Wuhan,Hubei 430100)

机构地区：[1]中国地质调查局海口海洋地质调查中心,海口571127 [2]浙江海洋大学石油化工与环境学院,浙江舟山316022 [3]长江大学石油工程学院,武汉430100 [4]非常规油气湖北协同创新中心,武汉430100

出　　处：《钻井液与完井液》2023年第2期184-192,共9页Drilling Fluid & Completion Fluid

基　　金：浙江省基础工艺研究项目“海洋油气开发微泄漏压差激活密封剂及其自适应修复机理研究”(LGG20E040002);舟山市科技计划项目“海洋油气井密封损伤的压力控释靶向修复技术研发”(2019C21006);湖北省重点研发计划项目(2020BAB072)。

摘　　要：钻井完井一体化工作液是对海洋油气传统裸眼钻井完井液技术的发展,该体系基于D90经验规则与膜屏蔽原理,引入低剪切速率黏度设计,通过暂堵剂的镶嵌、成膜作用在储层孔隙入口构造单向屏蔽环,不仅达到储层保护效果,还可直接返排,从而简化海洋钻井完井工序。阐述了钻井完井一体化工作液的设计思路,检测了关键组分微观结构及体系基本性能,并综合评价了体系储层保护效果。实验结果表明,钻井完井一体化工作液具有刚性和柔性2类暂堵剂粒子,可协同封堵孔隙入口,促进单向屏蔽环形成,其中刚性镶嵌粒子形貌不规则,中值粒径为9.5μm,大于孔隙尺寸;而柔性成膜粒子呈规则球形,平均粒径为25.4μm,粒径分布窄,有利于粒间填充及形变聚结。体系在5~130℃内具有良好流变性,其低剪切速率黏度平均值为30802±1892 mPa·s,满足直接返排解堵设计要求;体系展示了良好的润滑性、防塌性及抗海水、抗岩屑侵污性,且单向封堵能力强,直接返排的渗透率恢复效果好。现场应用证明,新型钻井完井一体化工作液不仅能确保储层钻井过程顺利,而且满足了直接返排解堵要求,达到了简化完井工艺的目的。The integrated drilling and completion fluid is the development of the traditional drill-in fluid used in offshore open hole drilling.The formulation of this new-generation drill-in fluid is based on the D90 empirical rule and the membrane shielding principle,and the concept of low-shear-rate viscosity is used.The insertion of temporary plugging agent particles and film-forming at the pore entrance of the formation rocks form a unidirectional shielding ring,which not only protects the reservoir from being damaged,but also can be flowed back directly,thereby simplifying the well completion procedure.This paper describes the design of the new-generation drill-in fluid as well as the experiment for examining the micro structure of the key components and the basic performance of the drill-in fluid.Experiments on the reservoir protection performance of the drill-in fluid show that the flexible and the rigid temporary-plugging particles in the drill-in fluid plug the pore entrances in a synergetic way,promoting the formation of the unidirectional shielding ring.Of the temporary-plugging particles,the rigid particles have irregular shapes,with median particle size of 9.5μm,which is greater than the sizes of the pores;whereas the flexible film-forming particles are in regular spherical shapes with average particle size of 25.4μm,the narrow size distribution of the flexible particles is beneficial to inter-particle filling and deformation coalescence.The drill-in fluid has good rheology at temperatures between 5℃and 130℃,and its average low-shear-rate viscosity is 30,802±1,892 mPa∙s,which satisfy the needs of flowback and block removal.The drill-in fluid has good lubricity,high inhibitive capacity and high resistance to seawater and drilled cuttings contamination.It is a good one-way plugging agent and direct flowback operation produces a high permeability recovery.Field application of this drill-in fluid indicated that the drilling of the reservoir section was smooth and successful,the requirements of direct flo

关 键 词：钻井完井 一体化工作液 直接返排 储层保护 单向屏蔽环 

分 类 号：TE254[石油与天然气工程—油气井工程]