任丘油田开发后期不稳定注水开采效果评价

任丘油田是我国最大的碳酸盐岩油田。在其主要开发期取得了良好的开发效果。为进一步提高原油采收率，进入开发后期以来，开展了降压、周期注水开采的矿场试验，至目前已有６年。文中应用数值模拟技术，将降压、周期注水与其它各类调整措施分解开来，进行单因素分析研究，旨在对降压、周期注水改善油藏开发后期开采效果的作用做出客观的评价。研究认为，尽管到目前为止降压、周期注水开采所增加的油量占总措施增产量的比例不大，尤其新井在稳产中还起着很重要的作用，但从开采机理上讲，其提高采收率的作用是新井和其它油井措施不可替代的。因此，在碳酸盐岩油藏开发后期对适合条件的油藏实施不稳定注水开采是必要的和可行的。

AN EVALUATION ON UNSTEADY WATER FLOODING IN THE LATER DEVELOPMENT STAGE OF RENQIU FIELD

The Renqui Oil field possesses the biggest carbonate reservoirs in China.The high recovery efficiency had been obtained during its major development stage,the depletion and cyclic water flooding development was carried out on its two reservoirs since the beginning of later development stage.The lease experiment has been lasted for six years.This paper presents a reservoir simulation technique to calculate single kind of measurement planning,from which each kind of measurement was decomposed.The main objective of the study was to evaluate the affectation of the unsteady water flooding to increase production of the Renqiu Field.The result indicated that,additional oil production by the depletion and cyclic water flooding is less than overall additional oil production by all kinds of stimulation and adjustment wells,even adjustment wells play an important role in increasing production.Unsteady water flooding cannot be replaced by the other stimulation and adjustment wells in the matter of EOR.It is feasible that unsteady water flooding might be used to carbonation reservoir in later development stage.