长庆姬塬油田罗1长8油藏调剖工艺技术研究与应用

Profile control technology in Luo1 Chang8 oilfield and its effect

罗1长8区块为长庆油田所辖的典型的低渗透油藏,区块中部、中北部局部裂缝较为发育,目前中部小范围连片见水,北部及西南部个别井组油井见水,截至2011年底共有见水井38口,占全厂20.5%,单井产能损失2.2t。为改善区块开发效果,2012年在该区实施整体调剖综合治理。采用以"弱凝胶+预交联颗粒+无机体系"为主体段塞的注入工艺,共调剖17口井。调剖后17口注水井注水压力平均上升1.6MPa,吸水指示曲线、压降曲线等测试资料表明优势水流通道得到了有效封堵。17口调剖井对应93口油井,见效36口,见效比例38.7%。累计增油2733t,累计降水1894m3。区域开发指标变好,整体调剖改善了该区注水开发效果。

It is a typical low permeability reservoir for Luol Chang8 block in Changqing oil- field.The fractures is relatively developed in central and north-central area,it is a widespread phenomenon for oil well to be in high water cut stage in partial scope of central, north block,and water breakthrough of individual well group is exsited in southwest block.There are 38 well groups with water breakthrough by the end of 2011,and it accounted for 20.5 % of the whole oil production plant, single-well production capacity loss 2.2 t.In order to im- prove the block development effect, the overall profile control is implemented in Luol block in 2012.17 wells isimplemented using main injection slug ＂weak gel＋gel particles＋inorganic system＂.Injection wells water injection pressure by an average of 1.6 MPa after profile con- trol, water index curves,pressure drop curve and other test data show that water channel is effectively pluged.36 oil wells is effective in 93 oil wells,which effective rate is 38.7 %. Cu- mulative increased oil is 2 733 t, decreased water is 1 894 m3.The overall profile control im- proved the water flooding development effect in the block.