Estimating Dynamic Reserves Of Carbonate Fractured-vuggy Reservoir In Tahe Oil Field By Water Injection Instruction Curve Method

The Ordovician reservoir in tahe oil field is a seam hole type carbonate reservoir,There is a big difference in the combination of Seam holes.The complexity of the hole combination shows a diversity in the water injection indication curve,leading to unclear understanding of the connectivity between carbonate wells.Therefore,it is necessary to study the model of different joints.Based on the previous study of the present situation of the water injection indication curve,this paper analyzes the characteristics of the fracture-cavern type carbonate water injection instruction curve.According to this,the model of different fractures of carbonate rocks is put forward,and the water injection instruction curve of the model is deduced.In this paper,three different combinations of fractures are proposed for carbonate rocks.The combination of single hole seam and double hole model,double hole seam and double hole series space combination and double hole seam and double hole parallel combination.And the water injection instruction curve,combined with the water injection mechanism,the formula is based on the definition of the definition of compression coefficient,after the pressure rise in water,resulting in changes in volume.For the combination of single hole seam and double-hole model,when the corresponding water injection instruction curve is deduced,the compressive coefficient of water,oil and hole seam system is considered,and the presence of water in the original reservoir is assumed.So the water and oil ratio parameters are also considered.The parameters considered on a predecessor basis are more comprehensive and the corresponding model is more applicable to the actual subsurface.Double hole seam and double cave in series model.Based on the single hole seam double hole model,considering the oil well drilling hole seam system,In the analysis of the impact of parameters,the same model between the different parameters to be compared between the same parameters of different models are also compared.In the parallel model of double hole seam and double-hole,the fracture system in the space has its own independence,and the pressure in the wellhead is superimposed.Theoretical model to be combined with the actual site,after the field of water injection pressure data collection and finishing,drawing more than 300 wells in the water injection curve,the classification summary,Three typical wells are selected,and Combined with the deduced water injection curve model formula for practical analysis.The selected wells should also consider the production characteristics,seismic profiles,logging interpretation and so on.The actual water injection curve of typical wells is selected to fit and the fitting curve is brought into the corresponding formula to solve the underground dynamic reserves.The results of the solution are analyzed by error analysis to ensure that the results are relatively reliable.