渤海QK17-2油田大位移水平井完井液体系研究

对大位移水平井完井液体系的研究内容及应用情况进行了总结。该项研究是海洋大位移钻井技术研究课题 ( 863 82 0 0 9 0 2 )的配套研究内容。大位移水平井完井液体系研究突出了 4个特点 :大位移井水平段完井液悬浮、携带、运移的特点及其特殊要求 ;大位移水平井需要砾石充填长期防砂完井 ;考虑套管射孔作业过程对储层保护的影响 ;考虑打开储层后各种工作液对储层的综合影响。通过室内研究和现场应用 ,取得了 4项关键技术的突破 :大位移水平井射孔后的屏蔽暂堵储层保护技术 ;大位移水平井射孔液的悬浮携砂技术 ;大位移水平井砾石充填携砂液的胶液悬浮、携砂及破胶技术 ;水平井工作液综合影响评价思路和技术。大位移水平井完井液体系应用于渤海QK17 2油田取得的成功经验 ,为今后在渤海进一步应用大位移水平井技术和有效地开发边际油田提供了借鉴

A STUDY ON COMPLETION FLUID SYSTEM FOR EXTENDED REACH WELL IN QK17-2 OILFIELD, BOHAI SEA

As a sub_project of The Study of Drilling Techniques For Extended Reach Well sponsored by CNOOC (Project 863--820-09--02), the study of completion fluid system for extended reach well has focused on four aspects:(1) completion fluid properties in suspension, entrainment and migration and their special criteria for horizontal section of extended reach well;(2) long_time sand control completion by gravel pack for extended reach well;(3) the effects of casing perforation operation on formation protection; and (4) the comprehensive effects of various operating fluids on perforated reservoir.By lab studies and field application,four key techniques have been broken through,i.e.the formation protection technique by temporary plugging,the suspension and entrainment technique of completion fluid for extended reach well,the suspensoid,entrainment and gel destruction technique of gravel pack entrainment fluid for extended reach well and the evaluation technique of overall effects of horizontal_well operating fluid.This completion fluid system has been successfully used in QK17-2 oilfield, which will provide experiences for further applications of these techniques and marginal field development.