果冻简笔画专利名称：Oil well pumpoff control system 发明人：Bobby L. Douglas
申请号：US05/520993
申请日：19741105
公开号：US03936231A
公开日：
优秀人才入境计划
19760203
专利内容由知识产权出版社提供
摘要：A nsor associated with the production of an oil well generates a signal indicative of pumpable fluid available in the wellbore. The signal activates a first oscillator who count is compared with a variable frequency oscillator having a frequency of approximately one- half that of the first oscillator. The comparison is made over a given period of time to ascertain the percentage of time the well has produced fluid. The integrated timer is adjusted to shut down the system when the percentage of time the valve is open drops to the prelected amount. In respon to the integration timer producing a signal, a shutdown timer is turned on which restarts the cycle after a prelected amount of time. The length of shutdown time for the pumping unit is pret according to the well fill-in rate. When the system is restarted by the shutdown timer, a pump- up timer is turned on which is adjusted to allow for a desired pump-up time. As the pump-up timer is allowing the system to recycle, the integration timer is ret and the recycling is completed if the requirements of the integration timer are met. Otherwi, the unit is shut down again and the system recycled. A variable electronic scaler is connected to the output of the integration timer which monitors the output signals from this timer.
A ret circuit between the integrator and the scaler rets the scaler to zero after a
学期陈述报告successful recycle of the system. A successful recycle occurs when fluid is pumped at a flow rate eq如何打包文件
ual to or greater than the prent minimum when the pump has been restarted after a shutdown period. If the pumped fluid flow rate achieves the minimum pret flow value during or at the end of the pump-up period, a ret signal is conveyed to the scaler to ret it to zero and continue pump operation and system recycling indefinitely, or until malfunctions interfere with the pumping operation or production drops below a level economically feasible for pumping operations.
When malfunctions do occur, such as parting of the sucker rod, the pumped fluid flow rate will remain below the desired pret value and no ret signal will be conveyed to the scaler. At the end of the pump-up cycle the pump will not be pumping fluids and will be shut down in respon to the signal from the integrator asmbly. Since there will be no ret signal to the scaler, it will begin to accumulate the shutdown signals. After the pret number of times the integration timer produces a shutdown signal, the scaler turns off the whole system. It can then be restarted manually. This provides a safety device for equipment failure such as breaking of the sucker rod. Means are also provided for recording the various timed cycles and also for monitoring the number of signals transmitted to the scaler, thus being indicative of the number of times the system has automatically shut down and successfully recycled.
十大帅哥Also a circuit is provided to determine the exact percentage of time that the pump is producing fluid fl
ow, whether above or below the pret minimum percentage. A continuous recorder may be ud with this circuit to maintain a constant record of the percentage of time the pump is flowing well fluids to allow the operator to determine if the pret minimum percentage should be lowered, and how much it should be lowered to obtain successful recycling of the pumping system.
申请人：DRESSER INDUSTRIES, INC.dare的用法
代理人：Michael J. Caddell,William E. Johnson, Jr.
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