Parameters Optimization Design Research Of Gas Injection For Oil For Carbonate Rocks Seam Hole Type Oil Reservoir

By the rapid development of gas injection is one of the world, the application range is wide, the obvious effect in the one way to enhance oil recovery. Seam hole type carbonate reservoir in tahe oil field with large water-eroded cave, solution pores and cracks as the main reservoir space, the strong heterogeneity, and the multiple flow methods coexist, belong to the problems of exploration and development.For seam hole type carbonate reservoir, fracture and cavity as the main flow channel, the flow characteristics of the scale of small to micron, big to dozens of meters, and a variety of flow system coexist, the influencing factors of recovery efficiency is more complicated.Because of reservoir in tahe oil field formation water salinity and high reservoir temperature, all have been successfully used in sandstone reservoir of polymer flooding, asp flooding and enhance oil recovery technology such as microbiological method, thermal recovery, cannot be directly used for seam hole type carbonate reservoir in tahe oilfield.Reservoir fracture development, increasing the risk of the high cost of chemical method application.The seam hole type reservoir in tahe oil field recovery, on average, only12%.How to improve the deep hole type carbonate reservoir development effect, recovery efficiency and economic benefits, in tahe oilfield in recent years and are eager to solve technical problems in the world.This project on ior by gas injection technology at home and abroad based on the investigation of the present situation and development trend, through the slot hole type reservoir in the early stage of the reservoir characteristics and gas injection production three times on the analysis of the gas well production data of gas injection gas source, gas injection method, made a evaluation of gas injection parameters, etc.Based on existing in tahe oil field gas injection technology research, established the calculation model of wellbore temperature field, gas injection pressure residual oil reserves estimation model, injection volume design models, and formed a set of economic evaluation of gas injection system.The main research results of this paper is as follows:USES Ramey formula, combined with the wellbore heat transfer coefficient calculation method, the wellbore temperature distribution calculation model was established, the temperature of the shaft is obtained by the model can calculate paragraphs;For pure gas well and water injection Wells, injection with Aziz and Beggs-Brill pressure calculation methods, such as wellbore pressure calculation model is established, through the model can calculate the pressure of the wellbore paragraphs;Using material balance method, combining with the data of water injection in oil well and gas injection production data, using linear regression method to calculate the single well control residual oil reserves. And on this basis of it, Injection volume is designed for pure gas Wells and water and gas injection Wells;konwing the bottom hole pressure or Injection volume,we can predicte well head pressure;Points rounds the economic evaluation for gas injection;Using Visual Basic language, in the wellbore temperature and pressure calculation model, the calculation model of remaining oil and gas injection on the basis of the design model, compiled a set of slot hole type of reservoir gas injection process parameters optimization design software.