采用多种注采方式提高高含水期油藏采收率──以克拉玛依油田六中区为例

USE OF MULTIPLE INJECTION-PRODUCTION PATTERNS FOR ENHANCED OIL RECOVERY OF RESERVOIRS IN HIGH-WATER-CUT STAGE──AN EXAMPLE FROM MIDDLE DISTRICT NO.6 OF KARAMAY OILFIELD

克拉玛依油田六中区三叠系克下组砾岩油藏进入中－高含水期后，注入水沿高渗透层突进，油层出砂严重，年综合递减率大于９．５％。在深入研定油藏的构造和储层特征后，采取多种注采方式，查清了油藏的油水分布和油水运动规律，提出整治方案，１９９０－１９９２年实施后，年采油量上升１７％，综合含水率由８１．２％降为７７．５％，地层压力上升７％，采收率由３２％提高到３５％。

In its high water-cut stage,injected water cone along high-permeability zones within Lower Karamay Formation(Triassic) conglomerate raservoir In Middle District No.6 of Karamay oilfield.Moreover,severe sand preductionproblem and annual decline rate of over 9.5%exist.Following a further study of oil-bearing structures and reservoircharacteristics, multiple injection-production patterns were used,thereby ascertaining subsurface distribution and flowpatterns of oil and water, and developing curing designs,When these designs were implemented in l990 1992,it re-sulted in annual oil production increase by l7%, water cut reduction from 8l.2%to 77.5%,subsurface reservoirpressure increase by 7%, and enhanced oil recovery from 32%to 35%。