花土沟油田精细注水开发实践及认识

Fine water-flooding development practice and understanding of Huatugou oilfield

花土沟油田为典型的长井段薄互层复杂断块油藏,非均质性严重,油水关系复杂,注采对应差,注水单层突进,地层压力下降快,产量递减幅度较大。为了改善该油田的水驱开发效果,在精细油藏描述的基础上,通过实施改善水质、完善井网、层系细分、水井分注、剩余油挖潜等精细注采调整工作,水驱控制程度和油藏动用程度得到提高,地层压力稳中有升,自然递减率下降,综合开发效果得到了明显改善。

Huatugou oilfield is a typical complex fault block and has the characteristics of long interval,thin inter-bedded,serious heterogeneity,complex oil-water relationship,poor injection-production corresponding difference,waterflooding monolayer onrushing,quickly dropped formation pressure and higher production decline rate.In order to improve the oilfield water flooding development effect,on the basis of fine reservoir description,through fine injectionproduction adjustment measures,such as by improving water quality,perfecting well pattern,strata subdivision,separate water injection,and remaining oil potential,the water drive control degree and the reservoir producing degree have been improved,the formation pressure is going up steadily,and the natural decline decreases.Therefore,the comprehensive development effect has been improved significantly.