公开(公告)号：US5678981A

公开(公告)日：1997-10-21

申请号：US535439

申请日：1995-09-28

Applicant: Cleon Leslie Dunham

Inventor： Cleon Leslie Dunham

IPC: E21B47/00 ,  F04B47/02 ,  F04B49/00

CPC classification number: E21B47/0008 ,  F04B47/02 ,  F04B2201/121

Abstract: A method is provided to monitor operation of a sucker rod pump, the sucker rod pump having a strain gauge mounted on a walking beam for determination of load. This method compensates for gradual changes in load due to temperature drift when gradual changes in surface card area are occurring and the surface card area or the measured average loads are within a range of a predetermined base surface card area or base average load. When the surface card area or the measured average load is not within this predetermined range, a correction is made to adjust a smoothed minimum load to an adjusted buoyant weight of the sucker rod string. This adjusted buoyant weight is the value that the smoothed minimum load would be expected to be. This algorithm therefore compensates differently for changes in load when the surface card area (or alternatively, the average load) are not within a predetermined value because these changes are generally not due to temperature changes, but due to changes in the operation for which the sucker rod pump monitoring and control system should respond. An alternative correction to the measured load is also provided for time periods when the sucker rod pump is idle.

Abstract translation: 提供了一种用于监测抽油杆泵的操作的方法，抽油杆泵具有安装在步进梁上的应变仪，用于确定负载。 该方法在表面卡区域的逐渐变化发生时，补偿由于温度漂移引起的负载的逐渐变化，并且表面卡面积或测量的平均负载在预定的基面卡面积或基本平均负载的范围内。 当表面卡面积或测量平均载荷不在该预定范围内时，进行校正，以将平滑的最小载荷调节到调节后的抽油杆串的浮力重量。 这种调整的浮力重量是平滑的最小负载预期的值。 因此，当表面卡片区域（或者平均载荷）不在预定值内时，该算法对于载荷的变化是不同的，因为这些改变通常不是由温度变化引起的，而是由于吸盘 杆泵监控系统应响应。 当抽油杆泵空转时，也提供对测量负载的替代校正。