Feasibility Study of Well Pattern Interchanging in K Oilfield

The K Oilfield has been in development for 30 years, and at present, the Oilfield has entered the stage of ultra-high water cut stage. In view of the unclear understanding of the residual oil distribution and the difficulty of relying only on conventional adjustment of potential mining methods to improve the development effect, through the in-depth analysis of the well network status, flooding status and existing problems of K oilfield, it is confirmed that although high water cut at the well, but the characteristics of longitudinal use and surplus oil enrichment between wells. Combined with numerical simulation the feasibility of stratigraphic interchange is demonstrated. Through the research of interchanging well pattern, changing the direction of fluid flow, increasing the ripple volume, and the direction of fluid flow is changed through stratigraphic well network interchange, it is found that the oil recovery speed can be more than doubled by carrying out interchanging well pattern, and the effect of no plugging in the original layer is better than the effect of plugging. The average daily oil production of a single well increased by 3.5 t after the layer-system swap in the ploy test, and the technology has been promoted on a large scale in K oilfield.