延长油田X区块高含水油藏不稳定注水可行性机理研究

Feasibility Mechanism of Unstable Water Injection in High Water Cut Reservoir in Block X of Yanchang Oilfield

为研究X区块高含水油藏不稳定注水的可行性,通过CMG软件建立机理模型研究了不稳定注水的可行性,并且对影响不稳定注水的因素进行分析。数值模拟结果表明:不稳定注水技术相比于常规注水开发效果较好,日产油量相比于常规注水能提高57%,累计产油量相比于常规注水能提高943 m3,含水率比常规注水低5.27%,且在不稳定注水方式下的注水量可以比常规注水减少5245.2 m3,毛管力、原油黏度、储层非均质性影响不稳定注水开发效果。X区块高含水油藏适合利用不稳定注水进行开发,该研究为目标区块后续进行不稳定注水提供了理论依据。

In order to study the feasibility of unstable water injection in high water-cut oil reservoirs in Block X,this paper establishes a mechanism model through CMG software to study the feasibility of unstable water injection,and analyzes the factors affecting unstable water injection.The main conclusions from numerical simulation are as follows:the unstable water injection technology has bet-ter development effect than conventional water injection,the daily oil production can be increased by 57%compared with conventional water injection,the cumulative oil production can be increased by 943 m3,the water cut is 5.27%lower than that of the conventional water injection,and the water injection volume in the unstable water injection mode can be reduced by 5245.2 m3.Factors like the capillary force,viscosity of crude oil,and heterogeneity of reservoir can influence the develop-ment effect of unstable water flooding.It can be concluded that the high water-cut oil reservoir in Block X is suitable for development by unstable water injection,and this study provides a theoretical basis for subsequent unstable water injection in the target block.