同心双管分注技术研究与应用

Research and Application of Concentric Double Pipe Separate Injection Technology

大港南部油田为高凝高黏复杂断块油藏,南部油田含油层系多、油层井段长、渗透率级差大、层间矛盾突出,但因油层埋藏深,注水压力高,注水水质不达标,井筒腐蚀结垢严重,测试调配时,遇阻遇卡现象普遍、成功率低,多年来分注工艺全部采用地面注工艺,造成套损套变严重,大修率高,管柱有效期短,难以满足多层系油藏精细配水的需要。为解决这一问题,并在南部油田应用了同心双管分注技术,取得了良好的分注效果。受益井组累计增油1865 t,节约测调费用24.5万元,截止目前仍然有效,累计节支创效1200万元,降本增效显著。同心双管技术能够有效提高注水开发效果,助力油藏有效注水、精细注水,具有较高的推广应用价值,提高了分注技术水平,为复杂断块油藏分层注水开发提供了新的思路。

Dagang Southern Oilfield is a complex fault block reservoir with high pour point and high viscosity.There are many oil-bearing formations,long oil-bearing well sections,large permeability difference and prominent interlayer conflicts in the southern oilfield.However,due to the deep buried oil layer,high water injection pressure,substandard water injection quality,serious wellbore corrosion and scaling,and low success rate in test deployment,surface injection technology has been adopted for many years,it is difficult to meet the needs of fine water distribution in multi-layer reservoirs.In order to solve this problem,concentric double pipe separate injection technology is applied in southern oilfield,and good separate injection effect is obtained.The benefit well group has increased oil by 1865 ton,saved 245000 yuan of testing and adjustment cost,which is still effective up to now,saved 12 million yuan of cost and increased efficiency.Concentric double pipe technology can effectively improve the effect of water injection development,help reservoir effective water injection,fine water injection,has high application value,improves the level of separate injection technology,and provides a new idea for stratified water injection development of complex fault block reservoir.