自流注水开发及影响因素分析

DEVELOPMENT BY WATER DUMPFLOODING AND ANALYSIS OF ITS INFLUENCING FACTORS

自流注水是一种经济有效的油藏能量补充方式，对于沙漠、海上等淡水资源匮乏地区的油田开发尤为重要。以中东沙漠地区x油田为例，从油层物性、水层物性、油层吸水能力及水层产水能力等角度，分析了油藏自流注水开发需满足的基本条件。在此基础上，利用数值模拟方法研究了自流注水井控制的地层水储量与其供给区域的原油储量之比及自流注水时机等因素对开发效果的影响。结果表明，地层水储量与原油储量之比越大，自流注水开发效果越明显；在油田不能稳产或地层压力衰减到设计水平之前实施自流注水，有利于改善开发效果。

Dumpflooding is one of cost-effective ways of supplying energy for oil reservoirs, especially for the oil- field development in the area where the fresh water is rather rare, such as desert, ocean and so on, the technique is more important. Taking X 0ilfield in the desert area of Middle East as an example, from the viewpoints of the reservoir and aquifer properties, capability of water absorption of the oil reservoirs, water productivity of the aqui- fers and so forth, the basic conditions of of the reservoir development by water dumpflooding are analyzed. And mo- reover, with the help of numerical simulation, the influences of the ratio between the original water in place to orig- inal oil in place （ ratio of OWIP to OOIP ） controlled by dumpflood well, dump water flooded opportunity and so on the development effects are investigated and researched. The results show that the bigger the ratio is, the more ob- vious the development will be; It is rational to implement the flooding before the oil production can＇t be stablized or the formation pressure drops down to the design level, and furthermore the development effects can be improved.