Variable ballast systems are necessary for manned submersibles to adjust their buoyancy.In this paper,the design of a variable ballast system for a manned submersible is described.The variable ballast system uses a su...Variable ballast systems are necessary for manned submersibles to adjust their buoyancy.In this paper,the design of a variable ballast system for a manned submersible is described.The variable ballast system uses a super high pressure hydraulic seawater system.A super high pressure seawater pump and a deep-sea brushless DC motor are used to pump seawater into or from the variable ballast tank,increasing or decreasing the weight of the manned submersible.A magnetostrictive linear displacement transducer can detect the seawater level in the variable ballast tank.Some seawater valves are used to control pumping direction and control on-off states.The design and testing procedure for the valves is described.Finally,the future development of variable ballast systems and seawater hydraulic systems is projected.展开更多
During the oil production, in order to monitor the working conditions of an electrical submersible pump （ESP）,an electrical current recorder is used to monitor the electric motor current of an ESP. The recorder char...During the oil production, in order to monitor the working conditions of an electrical submersible pump （ESP）,an electrical current recorder is used to monitor the electric motor current of an ESP. The recorder charts indicate various working conditions of the ESP. Subtle malfunctions or abnormal problems of the ESP can be detected and further analyzed from various features of these current curves on the recording charts. Presently, these current charts are manually read and analyzed in oil fields. In this paper, a diagnosis expert system is presented for automatically analyzing these current recording charts and identifying the working condition of the ESP. This expert system includes an open knowledge base, which can be updated or enriched according to the identified features of the current curves on the recording charts, and a condition monitoring and failure pattern recognition method, which is called ＂pick-up method of feature of the recording chart＂, and can be correctly applied in most cases. It has been shown that this expert system can effectively improve the accuracy and efficiency of failure diagnosis and working condition monitoring of ESPs.展开更多
为了降低彩南油田潜油电潜泵采油井的耗电量,提高其系统效率,文章以电潜泵井各部分功率损失与系统效率的关系为基础,从电潜泵井产液量、动液面、配套电机功率、电泵扬程、下泵深度等参数入手,编制了电潜泵工况分析及优化设计软件,并应...为了降低彩南油田潜油电潜泵采油井的耗电量,提高其系统效率,文章以电潜泵井各部分功率损失与系统效率的关系为基础,从电潜泵井产液量、动液面、配套电机功率、电泵扬程、下泵深度等参数入手,编制了电潜泵工况分析及优化设计软件,并应用该软件对彩南油田21口电潜泵井耗电量高、系统效率低的问题进行了原因分析,且对21口井重新进行优化设计。通过优化后的效果分析,系统效率提高了20.01%,吨液耗电降低了6.67 k W·h,年节约电费262.41万元。展开更多
基金Supported by the "863" Foundation under Grant No.2002AA401000
文摘Variable ballast systems are necessary for manned submersibles to adjust their buoyancy.In this paper,the design of a variable ballast system for a manned submersible is described.The variable ballast system uses a super high pressure hydraulic seawater system.A super high pressure seawater pump and a deep-sea brushless DC motor are used to pump seawater into or from the variable ballast tank,increasing or decreasing the weight of the manned submersible.A magnetostrictive linear displacement transducer can detect the seawater level in the variable ballast tank.Some seawater valves are used to control pumping direction and control on-off states.The design and testing procedure for the valves is described.Finally,the future development of variable ballast systems and seawater hydraulic systems is projected.
文摘During the oil production, in order to monitor the working conditions of an electrical submersible pump （ESP）,an electrical current recorder is used to monitor the electric motor current of an ESP. The recorder charts indicate various working conditions of the ESP. Subtle malfunctions or abnormal problems of the ESP can be detected and further analyzed from various features of these current curves on the recording charts. Presently, these current charts are manually read and analyzed in oil fields. In this paper, a diagnosis expert system is presented for automatically analyzing these current recording charts and identifying the working condition of the ESP. This expert system includes an open knowledge base, which can be updated or enriched according to the identified features of the current curves on the recording charts, and a condition monitoring and failure pattern recognition method, which is called ＂pick-up method of feature of the recording chart＂, and can be correctly applied in most cases. It has been shown that this expert system can effectively improve the accuracy and efficiency of failure diagnosis and working condition monitoring of ESPs.
文摘为了降低彩南油田潜油电潜泵采油井的耗电量,提高其系统效率,文章以电潜泵井各部分功率损失与系统效率的关系为基础,从电潜泵井产液量、动液面、配套电机功率、电泵扬程、下泵深度等参数入手,编制了电潜泵工况分析及优化设计软件,并应用该软件对彩南油田21口电潜泵井耗电量高、系统效率低的问题进行了原因分析,且对21口井重新进行优化设计。通过优化后的效果分析,系统效率提高了20.01%,吨液耗电降低了6.67 k W·h,年节约电费262.41万元。
