The Application of Sanding Production Control Technique in Heavy Oil Reservoirs(ABSTRACT)

摘要

The main objective of this paper is to establish a practical sanding producing control technique or engineering scheme for Bohai oilfield heavy oil reservoirs,China.It's is also focusing on the coupling between hydro-mechanical aspects of the sanding process,formation deformation/collapse,and the resulting permeability change.A sand erosion model is postulated after the onset of sand production,which is determined based on the degree of plastic deformation inside the reservoir formation calculated by the coupled reservoirgeomechanics model.Both the enhanced production and the ranges of the enhanced or sanding zone are calculated,the effect of sand production on oil recovery and enhancement are analyzed.Field data for sand production and enhanced oil production from Bohai Oilfield are used to validate the model for the sand rate and sand production.Our studies indicate that the enhanced oil production can be contributed by either (1) a higher fluid velocity due to the movement of the sand particles according to the modified Darcy's flow,or by (2) a negative skin or enlarged well radius increase development due to sand erosion and formation collapse near the well.Examples to be presented in this paper indicate that such an improvement on productivity reduces the near well pressure gradient so that the sanding potential is weakened,but permits an easier path for oil to flow into the well due to an enhanced permeability.