| Xinjiang oilfield is rich in heavy oil, and buried depth change is not big.lt is generally more shallow between140and700m. With high viscosity, density, flow resistance in mining, not only flooding efficiency is low, but also volume swept efficiency is low. At present, the effect of conventional thermal technology for mining is not ideal.Steam Assisted Gravity Drainage (SAGD) technology,as a frontier technology for the development of ultra heavy oil, can abtain very high recovery.It usually can reach70%, being attented by people increasingly. Research of development technologies for heavy oil reservoirs of xinjiang oilfield, especially for the SAGD of ultra heavy oil reservoir, has very vital significance.In view of heavy oil blocks being exploited and to be exploited of Xinjiang oilfields, this article bases on the research on domestic and abroad classification of heavy oil reservoir,development course and current situation of the comprehensive development technology,then studys on the SAGD basic theoretical.It does adaptability research on the SAGD and screening analysis in Xinjiang oilfield, SAGD multiphase flow simulation studing, productivity prediction and influence factors analysis of level production Wells. And it optimizes the hot rod pump lifting system parameters of heavy oil development.In SAGD adaptive research and screening, according to the oil reservoir conditions of using the technology of SAGD, the selection principle of the test is established. Combined with the reservoir characteristics of the main blocks (blocks of Zhong32〠Zhong37) in Qigu group of the windy city, it does adaptability research on the SAGD and screening analysis, and the district is so suitable for the test of SAGD.In SAGD multiphase flow of the borehole, it analyses the Inflow Performance Relationship of heavy oil SAGD Wells, and confirms the relationship between the SAGD well production and bottom-hole flowing pressure.Through analysing the well trajectory of SAGD wells, it makes sure that Beggs-Brill methods should be chose to calculate the wellbore pressure distribution.And it sets up the models for the wellbore temperature distribution and sticky-temperature distribution.According to the node analysis system, it analyses the pressure and temperature distribution rule of the level heavy oil production wells.In SAGD productivity prediction,based on Butler’s slope oil discharge theory, it establishes the mathematics model of the oil leaking gravity which based on double horizontal Wells. Compared with the actual production datas and its calculation results of the block of Zhong32in the windy city oilfield, the results is well and the accuracy of the model is proved reliability. And by using the double horizontal well discharge of oil gravity model,it designs and forecasts the production of the blocks of Zhong32and Zhong37in wind city oilfield. At the same time, it establishes the mathematics model of the oil leaking gravity which based on vertical-horizontal Wells, and designs and forecasts the production of the blocks of Zhong32and Zhong37in wind city oilfield. Based on the productivity prediction mathematical model, it analysises the effective thickness reservoir porosity steam temperature permeability oil saturation in SAGD parameters such as in the process of mining the effects of the SAGD to the applicable conditions further summarized.In SAGD rod pump lifting,it plans the SAGD rod pump lifting system optimization design process, sets up the highest efficiency of the system for lifting system optimization of the objective function and establishes the constraint conditions and the objective function of solution. At the same time,it optimizes the design of a SAGD heavy oil well lifting system.According to the efficiency of the system of the highest objective function, it determines the optimal of oil suction parameters which for xinjiang oilfield exploitation of heavy oil reservoirs SAGD provides the theory and the practice guidance. |
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