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Oil well screen protection device from erosional failure

IP.com Disclosure Number: IPCOM000227631D
Publication Date: 2013-May-09
Document File: 3 page(s) / 220K

Publishing Venue

The IP.com Prior Art Database

Abstract

Provide a barrier that has very low susceptibility to erosion damage caused by high velocity fluids (gas or liquid). The barrier protects an oil well screen’s filtration layer that is otherwise susceptible to erosion damage by the impingement of the high velocity fluids.

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Oil well screen protection device from erosional failure

(1) Purpose of the Invention:

Provide a barrier that has very low susceptibility to erosion damage caused by high velocity fluids (gas or liquid). The barrier protects an oil well screen’s filtration layer that is otherwise susceptible to erosion damage by the impingement of the high velocity fluids.

(2) Description of the Invention:

The barrier slides onto the outer surface of the oil well screen and is made of an erosion resistant material such as ceramic or tungsten carbide. The barrier may be cast molded to reduce manufacturing costs. The barrier may be stacked to cover the entire length of the oil well screen filter media. Adjoining barrier segments need not be rotationally locked together and may rotate freely with respect to one another. This freedom to rotate alleviates the build-up of shear stresses that may damage the barrier. A low tolerance fit of the barrier segments, one to the other, also prevents the build-up of stresses that may damage the barrier as the oil well screen experiences bending moments. The barrier device introduces a pressure drop such that flow is encouraged to enter the oil well screen at other areas along the oil well screen. Redirection of the flow within the barrier is used to create a pressure drop and the barrier is resistant to the erosive forces created by this redirection. The barrier may be prepacked with oil well gravel pack sand/proppant or it may be allowed to fill with oil well gravel pack sand/proppant during a gravel packing pumping operation.

Previous barrier designs consisted of a tubular shroud with various perforated designs. The shroud acted to impinge the high velocity flow and the small holes allowed a reduced flow. Other barrier designs used a dimpled shroud such that the flow was required to make a 90 degree turn, within the confines of the dimple, as it passed through the shroud. These earlier designed were all of metal alloy construction and were themselves subject to erosion. The new barrier design in this invention is constructed of material that is...