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AssigneeHalliburton Energy Services, Inc.
InventorsJiten Chatterji, David D. Onan, Roger S. Cromwell
Estimating the term…
The present invention provides improved methods and compositions for sealing a pipe string in a well bore. The methods basically include the steps of preparing a hardenable epoxy sealing composition which hardens into a resilient solid mass having high bond strength comprising an epoxide containing liquid, an organosilane compound and a hardening agent, placing the epoxy composition in the annulus between the pipe and the walls of the well bore and allowing the epoxy composition to harden.
An improved method of sealing pipe in a well bore comprising the steps of:
An improved method of sealing pipe in a well bore whereby the sealant can withstand the effects of contact with corrosive fluids and pipe movements comprising the steps of:
An improved composition for sealing pipe in a well bore which hardens into a resilient solid mass having high bond strength comprising:
Dependencies are inferred from the claim text.
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Macromolecular compounds: obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations:…
Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations:…
Methods or devices for cementing, for plugging holes, crevices or the like: plastering the borehole wall; Injecting into the formation
Term ended 18 Aug 2017 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
1. Field of the Invention
The present invention relates generally to improved methods and compositions for sealing pipe strings in well bores, and more particularly, to such methods and compositions wherein the sealant is corrosion resistant, highly resilient and has high bond strength.
2. Description of the Prior Art
In order to further illustrate the methods and epoxy compositions of this invention, the following examples are given.
An epoxide containing liquid comprised of diglycidyl ether of cyclohexane dimethanol and an epoxide resin comprised of the condensation product of epichlorohydrin and bisphenol A mixed with an aromatic solvent were tested individually and in 50% mixtures with each other. The epoxides were mixed with an organosilane, i.e., N-2-(aminoethyl)-3-aminopropyltrimeth-oxysilane and a hardening agent comprised of 2-ethyl-4-methyl-imidazole or a mixture of diethyltoluenediamine and tris (dimethylaminoethylphenol). Microsand (powdered crystalline silica) was added to the mixtures, and the mixtures were tested for shear bond strength. Additional identical mixtures were prepared without the organosilane compound, and they were also tested for shear bond strength.
The apparatus used to determine the shear bond strength included a standard ASTM 2".times.2".times.2" cube mold with a plastic liner and a metal plate to which the epoxide mixtures tested bonded to. A plastic liner was used to prevent the epoxide mixtures from bonding to the sides and bottom of the mold. The metal plate was 2" wide.times.3" high.times.0.5" thick with smooth surfaced ends at the top and bottom of the 3" height. The surfaced bottom served as a means to obtain a vertical positioning of the metal plate in the mold during pouring and curing of the epoxy mixture and the surfaced top was used for applying even loading to the plate. The other surfaces of the plate were sand blasted. The plate was placed in the center of the plastic mold and the epoxide mixtures tested were poured on both sides of the plate.