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Possible Problems And Solutions For Shallow Testing Of MWD Instruments

Oct 15, 2019

Phenomenon: The shallow test of the instrument is normal. After working for a period of time in the well, the signal is getting weaker.


           Reason: 1: The sensor is blocked.


                 2: Mud displacement exceeds the normal range of variation.


                 3: The viscosity of the mud becomes larger or the specific gravity becomes smaller.


                 4: The pump pressure is reduced.


                 5: The rotor eccentric wear speed is reduced.


                 6: The pulser telescopic sleeve becomes larger due to the high temperature.


                 7: The outer diameter of the mushroom head becomes smaller or the inner diameter of the restrictor ring becomes larger.


                 8: Fall into foreign bodies.


                 9: The filter block pump pressure rises.


                 10: The temperature at the bottom of the well exceeds the standard, causing the probe or pulse generator to not work properly.


           Solution: 1: Replace the pressure sensor.


                     2: Adjust the displacement.


                     3: Treat the mud and reduce the viscosity.


                     4: Large-scale activity drilling tools.


                     5: Replace the downhole equipment.


                     6: Repair the mud pump.


                     7: Replace the probe if the bottom hole temperature is too high.

 

ER-38 MWD Inclinometer

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