Gas Rate abnormality

Thanks Dennis & Dan Gibson for enlightenment on this topic.
I was initially thought that gas meter calibration will be giving error but our field people told us that the gas meter is not calibrated on that day and it is giving results as usual without any fault. Although this well has bubble point 530 psi and as layer wise it is more of sand layer.

After looking at the chart, it looks like the calibration (or related) of the gas rate meter changed arount the 14th of June. Oil production is just so flat, however how close to the bubble point are you?
Before seeing the plot I thought maybe depletion caused communication with a higher GOR compartment separated by a thin shale layer.
In our lab we use multiple-range flow meters and we see charts like yours when we shift to a more sensitive gas flow meter for the proper range.
Dennis H.