Study On The Adjustment Strategy Of The Horizontal Well Development In Bohai BZ Oilfield

The Bohai BZ oilfield was developed with horizontal well pattern water injection.Due to the influence of interlayers and heterogeneity,the development effect of different areas of the reservoir varies greatly,and due to the unclear understanding of the laws of the well pattern reserve utilization of different horizontal well patterns,it led to the later development of the oilfield.The effect is significantly reduced.Therefore,by studying the utilization pattern of horizontal well pattern reserves and the differential distribution of remaining oil,it can provide a strong basis for later horizontal well injection-production pattern adjustment and flow field regulation.In this paper,comprehensive analysis of percolation mechanics,reservoir engineering methods,and numerical simulations is conducted.By establishing reasonable horizontal well patterns and flow field evaluation methods,the in-depth study of reservoir utilization rules and flow field changes before and after regulation is conducted to determine a reasonable The adjustment strategy for the later development of the Bohai BZ oilfield includes the following main research contents: Firstly,Based on the principle of conformal transformation and potential superposition,the potential distribution in different horizontal well patterns is obtained,and different horizontal wells are obtained through the evaluation method of reserve utilization law.The influence of distance,row distance and well length on the degree of reserve utilization;Secondly,based on the actual reservoir characteristics and fluid physical properties of Bohai BZ oilfield,a numerical model of Bohai BZ oilfield reservoir was established.A new residual oil quantitative characterization method was proposed from the three dimensions of remaining oil reserves field,hydrodynamic field and flow relation field.Based on this,the remaining oil distribution model of the Bohai BZ oilfield was studied,and the remaining potential distribution type was determined;Thirdly,research on reserves utilization rules and flow field changes under different well pattern encryption adjustment methods and flow field control methods.The results show that: well spacing has the greatest impact on the infill well pattern of horizontal wells,and the optimal well spacing is between 200 and 300 m.Infill water wells have a better development effect than infill oil wells when only single wells are infilled;meanwhile,the injection and production ratios of infill wells when infill oil and water wells increase Larger,the greater the degree of displacement of the weakly activated area,the better the development effect;Finally,based on the numerical simulation study of well pattern adjustment and flow field control in the test area,appropriate horizontal well pattern infill adjustment and hydraulic adjustment strategies were determined.The research results obtained in this paper on the utilization pattern of horizontal well patterns,quantitative characterization of remaining oil,and flow field regulation have certain guiding significance for the later adjustment of horizontal well development in the Bohai BZ oilfield,and can also provide technical support for such oilfields.