南海油气田中后期复杂试井解释技术研究与应用

Research and application of complex well test interpretation technology in middle and later development period of South China Sea oil and gas field

随着部分油气田开发进入中后期,在进行试井解释的过程中经常遇到两相流、多井干扰以及多层合采的情况,而单靠常规解析试井无法建立合理的试井模型或无法得到准确的各相地层参数。针对以上难题,通过将常规试井分别与相对渗透率、数值模型以及PLT生产测井进行结合,解决了这些单靠常规试井手段无法解决的复杂试井问题,并在实际应用中准确获得了两相流试井各相参数,得到了多井系统中测试井不稳定试井特征曲线,减小了多层试井各层参数较大误差,提高了多层试井解释精度,形成开发中后期综合试井三个技术手段,从而为中后期精细开发研究奠定基础。

As the development of oil and gas field comes into the middle or later period, some problems occur in the process of well test interpretation, such as two phase flow, multi-well interference or commingling production; however, the conventional analytic well test neither can establish reasonable well test model nor can gain accurate parameters. According to the above problems, this paper combines conventional well test with relative permeability, numerical model and PLT production logging to solve these problems, and in addition, accurate two phase flow test well parameters are obtained in practical applications and unstable well test characteristic curves of test wells are got in multi-well system, accordingly, the big error of multilayer well test parameters are reduced and interpretation accuracy are improved, so as to provide basis for fine development and research in middle and later development period.