US 6,269,875 B1Granted

Chemical stick storage and delivery system

AssigneeThe Harrison Investment Trust

InventorsWilliam G. Harrison, III, Stephen G. Fulton, James Meaders

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Abstract

The chemical stick storage and delivery system includes a chemical stick delivery tube in communication with a well which supports a rotatable chemical stick storage device on the uppermost end of the delivery tube. The delivery tube includes an upper opening and the chemical stick storage device rotates to position chemical sticks sequentially over the delivery tube opening. Within the delivery tube is a first valve positioned directly beneath the delivery tube opening and a second valve spaced below the first valve for a distance sufficient to form a chamber between the first and second valves to receive a chemical stick. A central processor unit controls the operation of the first and second valves so that the first valve is opened while the second valve is closed and the chamber is brought to well head pressure before the second valve is opened to drop the chemical stick from the chamber into the well.

Claims20

Dependent claims

A chemical stick storage and delivery system mountable on a well head for providing elongate chemical sticks in spaced sequence to a well comprising:

an elongate delivery tube mountable on said well head and having a first open end and a second open end spaced from said first open end,
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 a stick receiving opening aligned with the first open end of said delivery tube, and
a chemical stick mounting unit mounted above said stationary base to hold a plurality of spaced chemical sticks and operating to move chemical sticks sequentially over said top surface into alignment with said stick receiving opening,
said chemical stick mounting unit including at least a rotatably mounted first stick receiving unit spaced above the top surface of said stationary base, said first stick receiving unit including a plurality of sequentially spaced chemical stick holders, each said chemical stick holder being formed to receive a chemical stick and to rotate with said first stick receiving unit to move a chemical stick over the top surface of the stationary base and into alignment over said stick receiving opening during rotation of said first stick receiving unit,
a drive motor mounted on said chemical stick storage unit and connected to rotate said first stick receiving unit,
a first position sensing unit mounted on said chemical stick storage device and operative to provide a first output, signal when a chemical stick is positioned in alignment over said stick receiving opening,
a second position sensing unit mounted on said chemical stick storage device and operative to provide a second output signal each time a chemical stick holder passes by said second position sensing unit, and
a central processor unit connected to receive said first and second output signals and to control said drive motor in response thereto.

5 more elements

A chemical stick storage and delivery system for providing elongate chemical sticks in 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 assembly mounted on said delivery tube and operating to selectively open or close said delivery tube at the first open end thereof,
a second valve assembly mounted on said delivery tube and spaced from said first valve assembly 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 an opening aligned with the first open end of said delivery tube,
a chemical stick mounting means rotatably mounted on said stationary base, said chemical stick mounting means operating to bold a plurality of spaced chemical sticks and being rotatable to move chemical sticks sequentially into said opening in alignment with said first open end of said delivery tube,
a drive motor operating to rotate said chemical stick mounting means,
a pressure equalization line having a first end for connection with said well head and a second end connected in communication with said delivery tube between said first and second valve assemblies,
a pressure equalization valve mounted in said pressure equalization line to open or close said pressure equalization line, and
a central processor unit connected to control the operation of said first and second valve assemblies, said pressure equalization valve and said drive motor.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/505,993Filed 17 Feb 2000 · continuation in part
Priority: 21 May 1997
Granted: 7 Aug 2001
Term ends: Not estimatedThe source records don’t support an estimate.

Classification3 codes

E21B 41/02
Equipment or details not covered by groups E21B15/00 - E21B40/00: in situ inhibition of corrosion in boreholes or wells
E21B 33/068
Well heads; Setting-up thereof: having provision for introducing objects or fluids into, or removing objects from, wells
E21B
Earth or rock drilling