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| Number | Title | Issue Date |
| 7163066 | Gravity valve for a downhole tool A gravity valve for a downhole tool for use in a subterranean well and a method of use thereof. The gravity valve is adapted to control the flow of a dowuhole fluid through the downhole tool. The gravity valve typically includes a plunger and a seat. The plunger may... | 01/16/2007 |
| 7108068 | Floating plate back pressure valve assembly A back pressure valve assembly for use in a well casing string. The valve assembly comprises a housing with a stationary and a floating plate therein. The floating plate is moveable between an open position spaced from the stationary plate and a closed position enga... | 09/19/2006 |
| 6554580 | Plunger for well casings and other tubulars A plunger for well casings and other tubulars comprising: An elongate body having a flow passage with a lower inlet port and an upper outlet port; an internal valve positioned between the ports; at least one first flexible sealing member positioned around... | 04/29/2003 |
| 6176309 | Bypass valve for gas lift plunger A bypass valve for a plunger in a plunger lift system in an oil and gas well is disclosed. The valve has a valve body, a piston and a spring. The pressure differential across the piston keeps the valve closed during the upstroke of the plunger. The spring... | 01/23/2001 |
| 6152228 | Apparatus and method for circulating fluid in a borehole An apparatus and method for circulating fluid in a borehole is described. The apparatus comprises a tubular assembly (1; 40; 60) which has an axial through passage (21, 18; 47; 19) between a fluid inlet (21) and first fluid outlet (19). The fluid inlet (2... | 11/28/2000 |
| 6050341 | Downhole running tool A downhole running tool (10) for use in positioning an item, such as a length of tubing (12) , in a bore comprises a body (11, 22) defining a fluid passage, an arrangement (20, 30) for creating a flow restriction, to create an increase in fluid pressure i... | 04/18/2000 |
| 6029744 | Method and apparatus for retrieving fluid samples during drill stem tests A nipple is provided downhole as part of a tubing (drill string or production) string. The nipple has an interior passage with recesses therein and a seat. A data probe attached to a wireline traverses inside of the tubing from the surface to the nipple. ... | 02/29/2000 |
| 5957198 | Telescoping joint for use in conduit connected wellhead and zone isolating tool A telescoping joint for use in a conduit connected to a wellhead and supporting downhole well tools to permit the downhole well tools to be axially displaced in the well bore without disconnecting the conduit from the wellhead is described. The telescopin... | 09/28/1999 |
| 5533570 | Apparatus for downhole injection and mixing of fluids into a cement slurry An apparatus for downhole injection and mixing of fluids into a cement slurry. The apparatus includes embodiments which either carry a fluid to the proper injection point in a wellbore or maintain it at the proper injection point until activated. In a fir... | 07/09/1996 |
| 5462115 | Gas and oil well swab A swab is movably mounted within a well casing and automatically removes fluid from the well upon accumulated pressure at the bottom of the casing reaching a predetermined amount to raise the swab within the casing. The swab has a hollow body with an inne... | 10/31/1995 |
| 4300636 | Constant bottom contact tool A drill string in a well bore has a mandrel extending longitudinally thereof adjacent the lower end of the drill string with a drill bit connected to the mandrel. Longitudinally extending helical groove means are provided in the mandrel and roller means a... | 11/17/1981 |
| 4298078 | Method of inhibiting sticking of well string A drill string in a well bore has a mandrel extending longitudinally thereof adjacent the lower end of the drill string with a drill bit connected to the mandrel. Longitudinally extending helical groove means are provided in the mandrel and roller means a... | 11/03/1981 |
