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US 7,621,321 B1Granted
Method and apparatus for removing casing
AssigneeHudson Services, Inc.
InventorsSandra Remedies, John Rucker, Richard Blanchard, Donald D. Deslatte, Kenneth Cahill
Life of this patent
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Abstract
A method and apparatus for removing a string of casing from a well bore. The method and apparatus include a plurality of drill bits substantially aligned with each other for drilling a plurality of holes in the string of casing. The plurality of holes can be used to lift the string in casing from the well bore via a series of incremental casing sections.
Claims18
A casing removal system, comprising:
- a) a pair of drill supports;
- b) a generally circular clamp, the clamp having a pair of half circular sections body, the clamp being mountable around a joint of casing which has been installed in a well bore;
- c) a first drill movably mounted on the first drill support, the first drill comprising a first drill bit having a longitudinal axis, the first drill bit being rotatably connected to the first drill;
- d) a second drill movably mounted on the second drill support, the second drill comprising a second drill bit having a longitudinal axis, the second drill bit being rotatably connected to the second drill;
- e) wherein, when the clamp is mounted on the joint of casing, the clamp holds the drill supports and the longitudinal axis of the first drill bit is substantially aligned with the longitudinal axis of the second drill bit;
- and
- f) wherein, said first and second half circular sections are detachably connected.
4 more elements
A casing removal system, comprising:
- a) a pair of drill supports;
- b) a clamp having a pair of half circular sections, the clamp being mountable around a joint of casing which has been installed in a well bore;
- c) a first drill movably mounted on the first drill support, the first drill comprising a first drill bit having a longitudinal axis, the first drill bit being rotatably connected to the first drill;
- d) a second drill movably mounted on the second drill support, the second drill comprising a second drill bit having a longitudinal axis, the second drill bit being rotatably connected to the second drill;
- e) wherein, when the clamp is mounted on the joint of casing clamp carries the drill supports and the longitudinal axis of the first drill bit is substantially aligned with the longitudinal axis of the second drill bit;
- and
- f) wherein, the clamp half circular sections detachably connected;
- and
- g) wherein the first portion of the body further comprises a first handle operatively connected to the first drill and activation of the first handle causes movement of the first drill in a linear direction and wherein the second portion of the body further comprises a second handle operatively connected to the second drill, and activation of the second handle causes movement of the second drill in a linear direction.
6 more elements
A method of removing a joint of casing from a well bore, comprising:
- a) attaching a plurality of slips on a string of casing located in the well bore;
- b) making a cut line which divides the string of casing into upper and lower sections;
- c) removing the upper section of the string of casing;
- d) connecting a casing removal system on the joint of casing;
- e) the casing removal system in step “d” comprising first and second drill bits operatively connected to the body, the first and second drill bits having longitudinal axes substantially aligned with each other;
- f) drilling holes in the joint of casing with the first and second drill bits;
- and
- g) pulling up the lower section of the string of casing from the well bore using the drilled holes.
5 more elements
Dependencies are inferred from the claim text.