南堡陆地油田水平井开发底水油藏油水运动规律

随着水平井开发的不断深入,地层水沿优势通道窜流,导致水平井含水率快速上升,产量大幅递减,同时对高含水后剩余油分布认识不清,严重影响了水平井的开发效益。以南堡陆地油田底水油藏为例,综合运用物理模拟、数值模拟方法与找水资料,分析储层物性、水平井不同狗腿位置及不同开发技术政策对含水率的影响,开展了水平井开发底水油藏油水运动规律研究;引入了底水出水准数的概念,揭示了不同类型水平井在均质和非均质底水油藏中的油水运动规律。对于均质油藏,标准水平井出水部位易出现在水平井跟端,有狗腿的水平井狗腿处是底水锥进的主要部位,而无狗腿处成为剩余油富集的主要部位;对于非均质油藏,底水易在高渗透率区锥进,而低渗透区则易成为剩余油富集区。

Fluidity rule study on bottom water reservoir for horizontal wells in onshore Nanpu oilfield

Horizontal well is of capacity to improve the well production, reduce the development cost, increase economic benefits and other significant advantages, and it has become one of the advanced technique for field development, but with the development of oilfield, it has gradually exposed the problems such as the channeling along the dominant channel, and leading to high water cut and production decline rapidly, as well as the poor understanding on remaining oil distribution. Taking the bottom water reservoir of Nanpu onshore as example, the integrated use of physical simulation, numerical simulation method and data combined with the water exploration to find the approaches to study the reservoir properties, horizontal well trajectory and different development policies with respect to horizontal well water cut change, and the fluidity rule is also studied as well. Herein, we also introduce the new concept to reveal the fluidity rule for different types of bottom water reservoir. For the homogeneous reservoir, we also indicate the water channeling distribution for the horizontal wells with or without dog leg, and for the heterogeneous reservoir, the bottom water is inclined to form the conning in the high permeable zone, and is apron to accumulate the remaining oil in the low permeable area.