宝力格油田巴38断块注水压力抬升机理

宝力格油田巴38断块投注初期,注水压力上升较快,严重影响正常注水.通过对储层岩心、现场取回的不同注入水进行水质分析,研究了地层水、清水、污水之间的配伍性和结垢性,并通过不同条件下的污水驱替实验,研究其对储层渗透率的影响,分析了引起储层伤害的主要原因和机理,阐明了该区块注入水质应达到的主要指标.研究结果表明,储层岩石的敏感性及注入清水在地层中结垢是造成注水压力上升的主要原因.

Study on uplifting mechanism of injection pressure in Ba 38 Block of Baolige Oilfield

The injection pressure went up quickly in the initial injection period in Ba 38 Block of Baolige Oilfield. The average injection pressure went up 1.13 MPa per month within half year, which affected the normal injection arrangement. By conducting water quality analysis, the compatibility and scaling probability were studied between formation water, clean water and sewage. The reservoir damage mechanism was studied by conducting sewage displacement experiments under different conditions, and the main indexes for injection water were illustrated. The study shows that the reservoir sensitivity and the scaling of injected water are the main reasons for the uplifting of injection pressure.