低渗透油藏超短周期间歇注水方式研究

A study on water-injection mode of low-permeability reservoirs

大港油田南区低渗透油藏两相共渗区窄 ,注水开发短期内含水上升迅速。根据间歇注水理论 ,并借鉴国内外油田的实践经验 ,1998年在舍女寺油田女 2 0、女 34区块开展超短周期 (周期 0 .5～ 5d)间歇注水试验。总结不同注水周期和频率及油井不同含水级别对其效果的影响 ,认为超短周期间歇注水可改善油层动用状况 ,对中、低含水受益油井之注水井有较好的适用性 ,为低渗透油藏注水开发提供了一种经济有效的方法。图 1参 1(王学立摘 )

The reservoirs in the southern Dagang oil field are of low permeability with a large number of micro pores. After water injection, water cut in producing wells rose very fast and complicated the production operation. Through analysis of intermittent water injection theory and introducing domestic and international experiences, the super small intermittent water injection was applied in two pay zones, Nv20 and Nv34 in Shenvsi oil field in 1998. Later on the effect of different cyclic time and frequency and water cut on oil exploition was studied. The considerable numbers of experiences have proven that. (1) Super small cyclic flooding can take advantage of much more beds. (2) Super small cyclic water injection is suitable for water-injection wells; the corresponding production wells resulting in considerable reduction of associated water volume and stabilization of production water cut at 60% level. (3) The super small intermittent water injection is an effective economical method, especially in low permeability reservoirs.