Importance

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Abstract

A gas and oil well controller includes a microcomputer control circuit which can control well production by monitoring well pressure levels, by time limitations, or any combination of the two. The controller includes a casing pressure sensor, a tubing pressure sensor, and a line pressure sensor for sensing pressure in the sales line, and a plunger position sensor for sensing the position of a plunger adjacent a top position in the well tubing. The microcomputer control circuit is in operative communication with the production valve, the casing pressure sensor, tubing pressure sensor, the line pressure sensor and the plunger sensor to open and close the production valve for gas flow to the sales line when the casing, tubing, and line pressures bear a predetermined relationship to preselected pressure limits or when the plunger is sensed by the plunger sensor. The controller includes a device for preselecting limit delays to suspend valve operations during pressure surges to avoid premature opening or closing. A device for preselecting a purge delay allows a purging of fluids from the well tubing after the plunger has reached the top of the tubing when the production valve would normally close. An auxiliary production valve is provided for the transmission of well fluids directly to a fluid storage tank bypassing the sales line as necessary, or for the introduction of injection gas into the casing.

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First Claim