Optimization of Oil Production Parameters of Rod Pump for Low-Productivity Wells in Ultra-Low Permeability and Tight Oil Reservoirs
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摘要: 特低渗透油藏及致密油藏低产井产量低、生产成本高，确定合理的有杆泵采油参数对于提高低产井经济效益意义重大。为此，根据现场采集的井下压力数据，以油井内流量积分方程为基础，建立了采油参数优化模型，并在确保油井稳产的前提下，采用该模型对冲程、冲次、开井时间和关井时间等参数进行了优化，以实现节能降耗。延长油田七里村采油厂163口油井应用该方法进行开井时间优化后，节电率达25.9%。研究表明，采用流量积分方程建立的采油参数优化模型降低了以往方法存在的误差，优化了开井时间和关井时间，可以降低有杆泵系统的能耗，提高油田生产效益。Abstract: It is difficult to optimize the working system of the rod pump due to low production and high energy costs of low-productivity wells in ultra-low permeability and tight oil reservoirs.By using bottom-hole pressure data of those oil producers,the model for the optimization of oil production parameters is built on the basis of the flow integral equation.By adopting the model,some parameters such as stroke length,stroke frequency,production time and shut-in time can be optimized without compromising steady peak production of those oil producers.Optimization of these parameters can effectively save energy and reduce costs.Experiments in 163 oil wells in the Qilicun Oilfield showed that energy consumption can be reduced up to 25.9% through the application of the technique to optimize the production time.Research results show that optimal model for oil production parameter based flow integral equations can effectively eliminate errors from previously applied techniques.This technique can effectively reduce energy consumption of the rod pump system to enhance overall performances of the oilfield.
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