Patent ID: 6044905
Filing Date: 2000-04-04
Classification: E21B,Y10T

Abstract:
A chemical stick storage and delivery system for providing elongate chemical sticks in a predetermined timed sequence to a well comprising:an elongate delivery tube having a first open end and a second open end spaced from said first open end,a first valve means operating to selectively open or close said delivery tube at the first open end thereof,a second valve means spaced from said first valve means and operating to selectively open or close said delivery tube,a chemical stick storage device mounted on said elongate delivery tube at the first open end thereof, said chemical stick storage device including a stationary base having a top surface with the first open end of said delivery tube opening at said top surface, anda chemical stick mounting means rotatably mounted on said stationary base, said chemical stick mounting means operating to hold a plurality of spaced chemical sticks and being rotatable to move chemical sticks sequentially into alignment with said first open end of said delivery tube, said chemical stick mounting means including a shaft mounted on said stationary base, a first plate mounted on said shaft spaced above the top surface of said stationary base, and a second plate mounted on said shaft and spaced between said first plate and the top surface of said stationary base, said first and second plates being provided with spaced apertures extending therethrough, the apertures in said first and second plates being aligned to form aligned aperture pairs, each aperture pair being formed to loosely receive a chemical stick,drive means operating to rotate said chemical stick mounting means including a ratchet gear mounted on said chemical stick mounting means, said drive means including a valve actuator means operative in a first state to open said first valve means and close said second valve means and operative in a second state to close said first valve means and open said second valve means, said valve actuator means operating to rotate said chemical stick mounting means when said valve actuator means returns to said second state from said first state and including a ratchet to engage said ratchet gear to rotate said chemical stick mounting means when said valve actuator means returns to said second state from said first state, and timer means operative at preset time intervals to actuate said drive means and said first and second valve means, said timer means operating at the end of a preset time interval to actuate said valve actuator means to cause said valve actuator means to initiate said first state and to subsequently actuate said valve actuator means to cause said valve actuator means to return to said second state.