US 2005/0087342 A1Published application

Method and apparatus for cementing pipe in oil and gas wells

OwnerByron Christenseninventor

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Abstract

A method and apparatus is disclosed for the anchoring of a pipe in a ground hole, such in an oil or gas well application. A first pipe is extended down the hole with its bottom end above the bottom of the hole, defining a gap. A cover plate is sealed to the top end of the first pipe. A second pipe is inserted through a throat in the cover plate such that its bottom end is in proximity to the bottom end of the first pipe. The inner annular space between the first and second pipes is filled with water and cementitious slurry is then pumped down the second pipe, to ascend in the outer annular space between the first pipe and walls of the hole until the outer annular space is substantially filled with the cementitious material. The second pipe can then be removed. Also disclosed is a cover plate apparatus for use in the anchoring of a pipe in a ground hole in accordance with the disclosed method.

Claims17

Dependent claims

A method for fixing a first pipe in an open hole in the ground by filling an outer annular space between the outside of the first pipe and walls of the open hole with cementitious material, the method comprising:

placing the first pipe in the open hole such that a gap is provided to allow cementitious slurry and water to flow from a bottom end of the first pipe into the outer annular space;
sealing a top end of the first pipe with a cover plate, wherein the cover plate is provided with a throat therethrough;
inserting a second pipe through the throat such that a bottom end of the second pipe is in proximity to the bottom end of the first pipe and a top end of the second pipe is above the cover plate, whereby an inner annular space is created between an outside of the second pipe and an inside of the first pipe;
sealing the second pipe in the throat;
substantially filling the inner annular space with water;
pumping cementitious slurry into the top end of the second pipe such that the cementitious slurry exits the bottom end of the second pipe and passes through the gap into the outer annular space and moves upward through the outer annular space pushing water up and out of the outer annular space, and continuing pumping until the outer annular space is substantially filled with cementitious slurry;
allowing the cementitious slurry to set and removing the second pipe.

4 more elements

Dependencies are inferred from the claim text.