TITLE:
Adaptability of Development Methods for Offshore Gas Cap Edge Water Reservoirs under Different Permeability Levels
AUTHORS:
Shaopeng Wang, Pengfei Mu, Jie Tan, Rong Fu, Mo Zhang
KEYWORDS:
Bohai Sea, Gas Cap and Bottom Water Reservoir, Permeability Gradient, Well Pattern, Recovery Degree
JOURNAL NAME:
Open Journal of Applied Sciences,
Vol.13 No.7,
July
25,
2023
ABSTRACT: The BZ 34-1 oilfield is a typical gas cap edge water reservoir in the
Bohai oilfield. The main characteristics of the oilfield were multi-phase sand
body stacking and the sand body was composed of three parts: gas cap, oil
reservoir, and edge water. The actual production site results show that the
permeability difference of multi-layer sand bodies has a serious impact on the
development effect. This article establishes a typical reservoir model
numerical model based on the total recovery degree of the reservoir and the
recovery degree of each layer, and analyzes the impact of permeability
gradient. As the permeability gradient increases, the total recovery degree of
all four well patterns decreases, and the total recovery degree gradually
decreases. The recovery degree of low permeability layers gradually decreases,
and the recovery degree of high permeability layers gradually increases. As the
permeability gradient increases, the degree of recovery gradually decreases
under different water contents. As the permeability gradient increases, the
reduction rate of remaining oil saturation in low permeability layers is
slower, while the reduction rate of remaining oil saturation in high
permeability layers was faster. By analyzing the impact of permeability gradient
on the development effect of oil fields, we could further deepen our
understanding of gas cap edge water reservoirs and guide the development of
this type of oil field.