一种计算高含水后期合理井网密度的新方法

A new method of calculating rational well spacing density in late stage of high water cut

周金应 万怡■

中海石油（中国）有限公司湛江分公司，广东 湛江 524057 中国中化集团勘探开发公司，北京 100031

目前我国东部各大油田都已进入了高含水后期或特高含水期，为了改善油田目前的开发效果，确保油田开发获得更好的经济效益，实现油田高产稳产目标，需要对现有井网进行加密调整。以前的井网密度计算都是在谢尔卡乔夫公式的基础上，简单地结合经济评价的方法来确定合理井网密度和经济极限井网密度，没有考虑油田进入高含水期后油田的开发特征。根据净现值原理，考虑注水波及系数和注采井数比以及高含水后期油田的一些开发特征的影响，如研究了地层物性、原油物性和非均质性等影响参数以及产量递减变化规律，重新建立了一个新的高含水后期合理井网密度的计算方法。该方法比以前的方法考虑的因素更为全面，更适合开发后期油田井网的加密调整,具有很强的实用性。

At present, the majority of oilfields have been in the late stage of high water cut or extra-high water cut stages in the eastern
area of our country. It is necessary to infill well pattern so that the oilfields can obtain better economic benefit and the aim of high
production and stable production can be achieved for improving current development effectiveness, decreasing composite water cut,
slowing production decline, reducing reserves loss and enhancing oil recovery. The old method of calculating well spacing density
was based on combining the economic evaluation method to determine the rational and ultimate well spacing density, but these
methods didn’t consider the development characteristics of high water cut in late stage. This paper uses the net present value
principle to establish a new and comprehensive mathematical model for calculating well spacing density in high water cut stage of
the oilfields. Compared with the former methods, this method considered the comprehensive effect factors, so it can calculate well
spacing density in high water cut stage of the oilfields. The analysis and calculation results indicate that the modified method is
feasible for late stage oilfield development, investment and making-decision. It has a strong practicability.