US 4,059,149 AGranted

Self-operating chemical feeder for an oil well

AssigneeTexaco Inc.

InventorRobert J. Harrison

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Abstract

A self-operating chemical feeder for an oil well is disclosed comprising a new combination of valves, Timers, a pump, an injection line, a flush line, and a tank of chemical wherein a first valve is responsive to a first timer for repeatedly ejecting spaced apart consecutive precise slugs of a chemical to the injection line for delivery to the oil well and for spacing each of the slugs from the next consecutive slug by a predetermined precise period of time. A second valve is responsive to a second timer for ejecting spaced apart slugs of flush liquid to the injection line, one flush liquid slug for each chemical slug, and for spacing each of the flush liquid slugs by a predetermined precise period of time for insuring oil well treatment on a regular basis as scheduled and for eliminating personnel time required for manually flushing each precise slug of said chemical throughout the well for an extended period of time.

Claims21

Dependent claims

A self-operating chemical feeder for an oil well having a tube with a casing therearound forming an annulus in the well comprising,

a. pump means on a chemical feeder housing for pumping a chemical into an injection line for passing down into the well,
b. first valve means on said injection line for ejecting a slug of said chemical into the injection line and well,
c. first timer means for controlling said first valve means,
d. flush line means for supplying a high pressure flush liquid to said injection line for circulating said chemical throughout the well,
e. second valve means for controlling the flow of said flush liquid in said injection line,
f. second timer means for controlling said second valve means,
g. said first valve means being responsive to said first timer means for being opened for a predetermined period of time for ejecting a precise slug of said chemical to said injection line for delivery to the well, and
h. said second valve means being responsive to said second timer means for supplying a predetermined slug of flush liquid to said injection line for circulating said chemical slug throughout the well for insuring well treatment on a regular basis as scheduled and for eliminating personnel time required for manually flushing slugs of the chemical throughout the well for an extended period of time.

5 more elements

A self-operating chemical feeder for a well having a tube with a casing therearound forming an annulus in the well comprising,

a. housing means,
b. container means for said housing means for storing a chemical,
c. injection line means for supplying said chemical from said housing means to the well,
d. pump means for said injection line means,
e. first valve means for said injection line means for controlling the flow of a slug of said chemical through said injection line means to the well,
f. first timer means for said first valve means for controlling the opening of said first valve means for a predetermined period of time,
g. a flush line extending from a source of high pressure flush liquid to said injection line means for circulating said chemical slug throughout the well,
h. second valve means for said flush line for controlling the flow of flush liquid through said flush line to said injection line,
i. second timer means for said second valve means for controlling the opening of said second valve means for a predetermined period of time for forming a slug of flush liquid,
j. said first valve means being responsive to said first timer means for being opened for the predetermined period of time for ejecting said precise slug of said chemical to said injection line means for delivery to the well, and
k. said second valve means being responsive to said second timer means for being opened for the predetermined period for supplying said predetermined slug of flush liquid to said injection line means for circulating said slug of chemical through the injection line means and throughout the well for insuring well treatment on a regular basis as scheduled and for eliminating personnel time required for manually flushing slugs of said chemical throughout the well for an extended period of time.

8 more elements

Dependencies are inferred from the claim text.