Casing centraliser

Details Casing centraliser Casing centraliser

1997-05-02

1998-08-25

Tsay, Frank

Wells

Guide for device or conduit

Surrounding existing device or tubing

1753251, E21B 1710

Patent

active

057974551

ABSTRACT:
A casing centraliser (10) includes an annular body (12) and a substantially cylindrical bore (16) extending longitudinally through the body (12). A number of blades (14) extend longitudinally along the body (12) and are circumferentially distributed around the body (12) to define a flow path between each adjacent pair of blades (14). Each flow path provides a fluid flow path between longitudinally opposite ends of the centraliser (10) and each blade (14) has a radially outer edge providing a well bore contacting surface. The cylindrical bore (16) through the body (12) is a clearance fit around casing intended to be centralised by the centraliser (10). The centraliser (10) is typically manufactured from a material which includes zinc and is preferably a zinc alloy.

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Correspondence from Fitzpatricks to the U.K Patent Office with attachments: U.K. Patent No. GB-2171436; and price quotation from Perth Foundry Ltd. to Frank's Casing Crews (U.K.) Ltd. dated Jul. 26, 1988 (Total pages=11).
Price quotation from Perth Foundry Ltd. to Frank's Casing Crews (U.K.) Ltd. dated Jul. 26, 1988 (Total pages=1).
Statutory Declaration of Alan Male of Ray Oil Tool Co. Ltd. with attachments: Exhibits AM1, AM2, AM3, and AM4 (Total pages=38).
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Marquesa Trademark Search System for U.K. Trademark Registration No. 1001644 for Cominco Ltd. dated 5 Apr. 1996 (Total pages=1).
Correspondence from Cominco to Mr. Alan Male, dated Apr. 9, 1996 with 13-page brochure and 4-page brochure (Total pages=18).
Affidavit of Mike Weeren, State of Texas, County of Jefferson, dated Feb. 8, 1996 (Total pages=1).
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Correspondence from Fitzpatricks to British Patent Office with attachments: Purchase Order from Ray Oil Tool Co., Inc. to Weeren P.O. No 0746 dated Jun. 15, 1989; Invoice from Weeren Enterprises to Ray Oil Tool Co., Inc. Invoice No. 4420 dated Jul. 1, 1989; and Letter from Mike Weeren to Robby Robbins at Ray Oil Tool Co., Inc. dated Oct. 5, 1995 (Total pages=4).
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Counter-Statement Under Rule 75(3) in the matter of U.K. Patent No. 2285649B in the name Downhole Products (UK) Limited ("the Proprietor") and an application under s.72(1) of the patents Act 1977 by Ray Oil Tool Co., Ltd. (the Applicant) (Total pages=2).

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