Method for chemical treatment of a subsurface wellbore
OwnerRobert N. Ayresinventor
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Abstract
A method for injecting treatment chemical into a well includes selecting times at which to operate a chemical dispenser to inject a selected amount of treatment chemical into a well. At each selected time whether a wellbore pump is operating is determined. If the pump is operating the selected amount of treatment chemical is dispensed into the well. If the pump is not operating, no chemical is dispensed and a counter is incremented. At each subsequent selected time, the determining whether the well pump is operating is repeated. When a subsequent selected time coincides with a time at which the well pump is determined to be operating, the chemical dispenser is operated to inject a product of the number in the counter plus one, and the selected amount of treatment chemical into the well.
Claims6
A method for injecting treatment chemical into a well, comprising:
- selecting times at which to operate a chemical dispenser to inject a selected amount of treatment chemical into a well within a predetermined time interval;
- at each selected time, detecting a signal generated by a pump controller corresponding to whether a wellbore fluid lift pump is operating, the wellbore fluid lift pump arranged to lift fluid from the wellbore;
- detecting at least one selected time within the predetermined time interval that the wellbore fluid lift pump is not operating, inhibiting operation of the chemical dispenser and incrementing a counter in a controller in signal communication with the chemical dispenser;
- and
- operating the chemical dispenser during the predetermined time interval at a subsequent selected time coincident with operation of the wellbore fluid lift pump;
- and
- dispensing into the well an amount of treatment chemical equal to the product of the number in the counter plus one multiplied by the selected amount of treatment chemical.
Dependencies are inferred from the claim text.