Study On Foam Water Control Technology Policy In Edge-bottom Water Reservoir

The edge-bottom water reservoir widely distributed at home and abroad.It has the advantages of higher oil reserves and sufficient natural energy.However,the reservoir is affected by the edge of the water during the mining process and the bottom of the water prone to reservoir and other issues.Thus the recovery percent of reservoir will be greatly reduced.The foam water control technique is a effective method to enhanced oil recovery at the later reservoir exploitation.It has many ad advantages,such as low cost,small density,selective blocking and many more.Therefore,it has great significance to research the application of foam water control technique in the development of edgebottom water reservoir.In this paper,Waring Blender method was used to screen the foaming agent and foam stabilizer under different concentration conditions based on the comprehensive value of foam system,and the optimum concentration of the selected foaming agent and foam stabilizer was analyzed.Finally,the optimal combination of foam systems was finalized.The relationship between foam system and oil recovery and water cut has been researched in the condition of different foam slug length,different timing of foam system injection,different oil viscosity and different gas-liquid ratio using the method of one-dimensional displacement experiment.The influence of fluid factors,geological factors and development factors on the water control of the edge-bottom water reservoir was studied by means of numerical simulation,and the main factors and sensitivity of the reservoir were analyzed based on the development degree of foam system with secondary water flooding.Finally,a geological model and a numerical model were established for block A of Chunguang Oilfield,and the distribution law of remaining oil is analyzed on the basis of historical fitting,and the wells with foam water control were screened and the water control scheme was designed.Finally,numerical simulation method was used to predict the effect of reservoir development after foam water control.