专利名称：Floating apparatus for downhole use and
method of making it
发明人：Sullaway, Bobby L.,Murray, Dick A.,Rogers,
Henry E.
申请号：EP97301796.5申请日：19970318公开号：EP0796979A3公开日：19980325
专利附图：
摘要：A floating apparatus for a well casing includes a check valve (30) disposed in asleeve (32), wherein the sleeve (32) is receivable within an outer case (14). The outer case
comprises coupled upper (16) and lower (18) casing string sections. The check valve (30)includes a valve housing (44), wherein a first cement body portion (78) attaches the valvehousing (44) to the sleeve (32). The sleeve (32) includes an annular flange (38) thatextends outwardly therefrom and is received between ends of the coupled upper (16)and lower (18) casing string sections for holding the sleeve (32) and affixed valve (30)within the outer case (14). A seal (40) is provided between the flange (38) and upper (16)casing string section. A second cement body portion can be provided for attachment ofthe sleeve to the outer case, thereby to hold the sleeve (32) and affixed valve (30) withinthe outer case which is threadably connectable with the well casing. Preferably, thesecond cement body portion only partially fills an annulus between the sleeve and outercase, wherein the well casing is received in the annulus when threadably connected to theouter case.
申请人：Halliburton Energy Services, Inc.
地址：P.O. Box 1431 Duncan, Oklahoma 73536 US
国籍：US
代理机构：Wain, Christopher Paul
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