The study of horizontal well excavation technology of point bar during ultra-high water-cut stage based on flow field intensity evaluation

Abstract

Abstract The Ming Huazhen group of Gang Dong Oilfield is a medium–high permeability reservoir of meandering stream deposits. It has a high areal and vertical heterogeneity and has entered the stage of extra-high water-cut. Point bar is an important development area for oil sands in meandering stream deposits and the development of a lateral layer is an important factor controlling the distribution of residual oil. The change rule of water displacement in medium–high permeability reservoirs was clearly determined by laboratory experiments. A numerical simulation method was used to determine the time-varying physical properties of the reservoir. Based on the internal configuration of the meandering river point bar, the horizontal well excavation method for residual oil development of point bars during the ultra-high water-cut stage is employed on the basis of the evaluation of flow field intensity. The results show that this method can well reflect the distribution of the flow field in a point bar sand body. The degree of extraction increases by 3.2% if horizontal wells are drilled in the weak flow field rather than in other places.

Keywords

• Medium high permeability reservoir
• Ultra-high water-cut stage
• Point bar deposit
• Internal configuration
• Strength of flow field