有杆泵同井注采系统工况诊断方法研究

Research on Fault Diagnosis Method for the Sucker Rod Pump Injection-production System

与常规的单泵系统相比,有杆泵同井注采系统结构更加复杂,井下工况更加恶劣,现有技术不再适应其井下故障诊断的需要,严重影响了油田的产量和经济效益。鉴于此,根据现场实际工况,从Gibbs模型出发,提出了一种反推计算方法,建立并求解动载模型,进一步结合实测悬点示功图,绘制采出泵和注入泵示功图。现场18口井的应用中,对注入泵故障的判断结果与检泵结果符合度为91.3%,验证了计算模型的正确性。该诊断方法为有杆泵同井注采系统的现场应用提供了必要的理论指导。

Compared with the conventional single-pump system, the structure of the sucker rod pump injec-tion-production system is more complicated and its downhole working conditions is harsher. The existing technology can no longer meet the need of downhole fault diagnosis, which seriously affects the oilfield output and economy ben-efit. In view of this, according to the actual working conditions in the field, based on the Gibbs model, a method of backstepping calculation is proposed. The dynamic load model is established and solved. Based on the measured pol-ished rod diagram, the dynamometers of the production pump and injection pump are also drawn. In the field applica-tion in 18 wells, the coincidence of the judgment results of injection pump failure with the results of pump inspection was 91.3%, which verified the correctness of the calculation model. The diagnostic method provides the necessary theoretical guidance for the field application of the sucker rod pump injection-production system.