考虑产液量变化的水驱油藏产量递减规律研究

The Production Decline Laws of Water Drive Reservoirs Considering Variable Liquid Production

凌浩川 周海燕 孟智强 石洪福 孔超杰

LING Haochuan ZHOU Haiyan MENG Zhiqiang SHI Hongfu KONG Chaojie

中海石油（中国）有限公司天津分公司渤海石油研究院，天津 300459

Bohai Oilfield Research Institute, Tianjin Branch, CNOOC (China) Co., Ltd., Tianjin, 300459, China

前人发现定产液量生产时的水驱曲线法与Arps递减方法之间存在着联系，而油田开发过程中随着含水率上升产液量会逐渐升高，很难实现定产液量生产，因此开展了产液量变化情况下的产量递减规律研究。在推导产液量变化情况下产量递减率通式的基础上，推导出了4种常用水驱曲线变产液量生产时的产量递减率公式，并结合油田实际生产数据拟合分析结果，得到了乙型与丙型水驱曲线变产液量生产时的产量计算公式。分析发现：定产液量生产时的产量计算公式是变产液量生产时产量计算公式的一个特例；若油田生产符合乙型水驱曲线特征，当油田的产液量变化率与预测初始时刻的产量递减率一致时，油田的产量能保持稳定。研究结果表明，通过提高产液量维持油田稳产会导致产液量呈指数增长，因此在油田开发过程中要结合实际情况制定合理的工作制度，不能为追求稳产将产液量提高幅度制定得过高。

Previous studies have shown that a relationship between water drive curve method and the Arps decline method exists in constant liquid production. However, liquid production will gradually increase with the increase of water cut, and it is difficult to accommodate the condition of constant liquid production during oilfield development. The study on the production decline laws under variable liquid production was carried out. Based on the general formula of production decline rate under variable liquid production, the researchers derived a formula of production decline rate under variable liquid production for four kinds of commonly used water drive curves. Then a production calculation formula for the type B and type C water drive curves considering variable liquid production was established by aligning and analyzing the practical results of oilfield production. In the analysis, it was found that the production calculation formula of constant liquid production is a special case of that of variable liquid production. If production complies with the characteristics of type B water drive curve, the productivity of oilfield will remain stable when the oil production change rate is equal to the production decline rate as primarily forecasted. The research results showed that to maintain oil production of an oilfield by increasing liquid production will lead to an exponential increase in liquid production. Therefore, a reasonable working system should be formulated in combination with the actual situation in the process of oilfield development. Obtaining stable oil production from very high liquid production is not recommended.

“十三五”国家科技重大专项“渤海油田加密调整及提高采收率油藏工程技术示范”（编号: 2016ZX05058-001）资助

https://doi.org/10.11911/syztjs.2018155