Volume 50

A New Method for Clarifying the Water Breakthrough Rule of Horizontal Wells in the Bottom-water Oil Reservoir and Field Application Jiangpeng Hu ,Pin Jia ,Shuo Wang,Binyu Wang,Jinbao Liu,Quanyu Pan

Abstract

Attributes is highly heterogeneous along horizontal wells and the water breakthrough mechanism is complex in the bottom-water oil reservoir. The conventional numerical and physical simulations are laborious and have a limited contribution to on-site water plugging operations. This paper presents an effective method for clarifying the water breakthrough rule of horizontal wells. Firstly, the water drive mathematical model of the heterogeneous production area was constructed by analyzing well-logging curves. Secondly, the adaptive iterative algorithm was adopted to realize the prediction of the water breakthrough parameters along horizontal wells, based on the non-piston water drive theory. Finally, the validity of the innovative model is verified through comparison with a rigorous physical simulation experiment. The results show that the water breakthrough time difference along the horizontal well and the water cut stage height of the single well are positively correlated with the permeability differential. The permeability differential is negatively correlated with the utilization degree of low permeability area. The increase of the area of the high permeability section delays the water breakthrough time and has a great influence on the water cut of single well. With the increase of water avoidance height in high permeability area, the water breakthrough time of oil well is delayed, and the height of water cut stage of single well is reduced. Finally, taking a horizontal well of an oilfield in Bohai Bay as an example, this paper clarifies the water breakthrough rule of the 9th member of the horizontal well and identifies more remaining oil in the first and 4th members. This research has an important theoretical instructional significance to formulate reasonable single well control water plugging measures.

Keywords Bottom-water oil reservoir, Horizontal well, Adaptive iteration,Water breakthrough rule