MONITORING, PREVENTION AND MANAGEMENT METHOD FOR PREVENTING DRILLING PUMP FROM PUMP SUFFOCATION AND MISOPERATION, AND PUMP PRESSURE PROTECTION SYSTEM THEREFOR

摘要

Disclosed are a monitoring, prevention and management method for preventing a drilling pump from pump suffocation and misoperation, and a pump pressure protection system therefor. The monitoring method may comprise mounting a standpipe pressure sensor on a standpipe for detecting the pressure inside the vertical standpipe; mounting a pump pressure sensor on a discharge line of the drilling pump for detecting the pressure of the drilling pump; setting a judgement constant N according to the average value of the difference between mud pressure in the pipelines upstream and downstream of a high-pressure valve in a normal operating condition; and at the start of the drill pump, comparing the mud pressure P1 in the pipeline upstream of the high-pressure valve and the mud pressure P2 in the pipeline downstream of the high-pressure valve in real time: if P1-P2≤N, the high-pressure valve is determined in an open state, and the drilling pump is operating normally; and if P1−P2>N, the high-pressure valve is determined in a closed state, and a pump suffocation occurs to the drilling pump. According to the method, whether the high-pressure valve is closed is determined by means of calculating and comparing the difference between upstream and downstream pressure of mud liquid using the pressure sensors, such that not only can a drilling pump be prevented from a pump seizure accident due to suffocation, but also a safety risk brought about by an ultra-high pump pressure of a drilling pump during drilling can be prevented by means of taking full advantages of the pressure sensors.