DEVICE FOR DIAGNOSING CONDITION OF PRODUCTIVE WELLS Russian patent published in 2000 - IPC

FIELD: oil production industry. SUBSTANCE: device has force sensor rigidly secured by its ends on polished rod of deep-well sucker rod pump. Also provided is position sensor similarly mounted of polished rod of sucker rod pump with possibility of axial displacement. Unit of recording and converting of signals is connected with force sensor and position sensor. Force sensor is made in the form of elongated rigid strip with non-uniform cross-section over its length. Rigidly fastened on central part of strip is resistance strain gauge. End portions of strip are rigidly fattened by means of yokes on polished rod of sucker rod pump in parallel to its longitudinal axis. Position sensor is made in the form of limit switch with push-button 1. Position sensor is installed on polished rod of sucker rod pump with possibility of axial displacement. Force sensor is connected with signal recording and converting unit through resistance strain gauge and position sensor. Application of aforesaid embodiment of device allows for enhancing reliability of diagnosing condition of well due to higher degree of sensitivity of force sensor with simultaneous ensuring phase coincidence and synchronism of time-base of this force when moving string of rods or polished rod. EFFECT: higher efficiency. 2 dwg