Research On Injection And Production Parameters And Adjustment Methods Of Horizontal Wells In SN Development Area

SN development area is located in the north of Daqing placanticline.The structure type belongs to asymmetric short-axis anticline accompanied by medium and small normal faults.The reservoir has high and low permeable layer,thick and thin oil layer and low natural driving energy,so the horizontal well production technology is adopted.Based on the development of horizontal well drilling is still in a relatively early fumble,the dynamic change rule and tracking and adjusting technology research experience is insufficient,therefore conduct injection-production parameters of horizontal well and comprehensive adjustment technology research,slow water cut rising rate,improve the ultimate recovery of horizontal well,It is of great significance to guide the continuous and efficient development of horizontal Wells in SN development area.Based on the establishment of SN development area geological model,develop the remaining oil distribution research,found in the area between the adjacent production of enrichment of remaining oil is easy,mainly in SⅡ2+2a 6～14 small layers;Through numerical simulation,the horizontal well B5-8-A53 is predicted under the condition of 98%water cut limit,and the final recovery rate is 50.6%.Based on the analysis of the water-injection effect characteristics,the production formula of horizontal wells was deduced according to the basic principles of energy conservation and seepage,and the reasonable injection-production parameter limits of horizontal wells were studied.It was concluded that when the liquid production was20m~3/d,the reasonable injection water volume was 18m~3/d,and the reasonable injection-production ratio was 0.9.Based on the study of the comprehensive adjustment supporting technology of horizontal wells,it is concluded that when the horizontal wells are in production for 3 months,five-point well pattern injection should be adopted to supplement formation energy.If the horizontal well is located at the edge of the fault or reservoir,water should be injected from the toe of the horizontal well with a water injection intensity of 3.0m~3/(d·m)first.When the water cut of the horizontal well reaches 40%,water should be injected from the root end with a water injection intensity of 1.4m~3/(d·m).