计算机仿真在异常高压气井生产中的应用

APPLICATION OF COMPUTER SIMULATION TO ABNORMALLY HIGH-PRESSURE GAS-WELL PRODUCTION

通过分析异常高压气井(藏)地层流动、井筒流动及井口气嘴流动的压降过程,建立了气井流动动态数学模型;利用计算机仿真技术对气井流动动态数学模型进行了模拟(仿真),并在计算机上运行实现了对异常高压气井生产动态的检验和修正,从而达到了对异常高压气井生产流动过程可视化和预测的目的;计算机仿真还预测了气井生产动态流动参数,为下步异常高压气井优化配产提供了基础数据。并通过实例分析将计算机仿真预测出的异常高压气井流动参数代入优化配产模型计算出最大可采出量,可明显提高实际可采储量,表明利用异常高压气井动态仿真对气井的实际生产具有重要的指导意义。

In abnormally high-pressure gas wells (or reservoirs), the drawdown in the formation flow, wellbore flow and wellhead choke flow was at first analyzed; and then, a dynamic mathematic model of gas-well flow was established; after that, this model was simulated by means of computer simulation technology; meanwhile, the production performance of gas wells with abnormal high pressure was tested and modified in order that the well′s production and flow could be visualized and predicted. In addition, flowing parameter of production performance was predicted by computer simulation and some basic data were presented for further optimizing these wells. Maximum recoverable reserves could be calculated by the predicted flowing parameter and the optimized model. The recoverable reserves are obviously higher than the actual recoverable reserves, reflecting that dynamic simulation is significant for an actual production.