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Class Information
Number: 166/153
Name: Wells > Pistons, fluid driven into well (e.g., cementing plugs)
Description: Devices comprising piston means adapted to be inserted from the top of the well into an already placed well conduit and to be driven down by fluid pressure acting directly on the piston.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7559363 |
Wiper darts for subterranean operations |
Jul. 14, 2009 |
| 7552779 |
Downhole method using multiple plugs |
Jun. 30, 2009 |
| 7490668 |
Method for designing and constructing a well with enhanced durability |
Feb. 17, 2009 |
| 7475731 |
Sand plunger |
Jan. 13, 2009 |
| 7448442 |
Pad type plunger |
Nov. 11, 2008 |
| 7325617 |
Frac system without intervention |
Feb. 5, 2008 |
| 7234522 |
Apparatus and method for drilling a wellbore with casing and cementing the casing in the wellbore |
Jun. 26, 2007 |
| 7096949 |
Wiper plug with packer |
Aug. 29, 2006 |
| 7025134 |
Surface pulse system for injection wells |
Apr. 11, 2006 |
| 6997253 |
Anti-rotation method and apparatus for limiting rotation of cementing plugs |
Feb. 14, 2006 |
| 6973966 |
Compressible darts and methods for using these darts in subterranean wells |
Dec. 13, 2005 |
| 6951246 |
Self-anchoring cementing wiper plug |
Oct. 4, 2005 |
| 6945326 |
Non-rotating cement wiper plugs |
Sep. 20, 2005 |
| 6896051 |
Anti-rotation method and apparatus for limiting rotation of cementing plugs |
May. 24, 2005 |
| 6868908 |
Anti-rotation method and apparatus for limiting rotation of cementing plugs |
Mar. 22, 2005 |
| 6848511 |
Plug and ball seat assembly |
Feb. 1, 2005 |
| 6834719 |
Drillpipe sub |
Dec. 28, 2004 |
| 6796377 |
Anti-rotation apparatus for limiting rotation of cementing plugs |
Sep. 28, 2004 |
| 6746213 |
Pad plunger assembly with concave pad subassembly |
Jun. 8, 2004 |
| 6739391 |
Surface deployed cement separation plug |
May. 25, 2004 |
| 6739398 |
Liner hanger running tool and method |
May. 25, 2004 |
| 6725917 |
Downhole apparatus |
Apr. 27, 2004 |
| 6719060 |
Plunger lift separation and cycling |
Apr. 13, 2004 |
| 6675888 |
Method and system for moving equipment into and through an underground well |
Jan. 13, 2004 |
| 6669449 |
Pad plunger assembly with one-piece locking end members |
Dec. 30, 2003 |
| 6651743 |
Slim hole stage cementer and method |
Nov. 25, 2003 |
| 6634425 |
Instrumented cementing plug and system |
Oct. 21, 2003 |
| 6595282 |
Fluid filled drill pipe plug |
Jul. 22, 2003 |
| 6561270 |
Plug and plug set for use in wellbore |
May. 13, 2003 |
| 6561269 |
Canister, sealing method and composition for sealing a borehole |
May. 13, 2003 |
| 6557631 |
Down hole tension/compression device for logging tools |
May. 6, 2003 |
| 6523612 |
Method and apparatus for cleaning wellbore casing |
Feb. 25, 2003 |
| 6467541 |
Plunger lift method and apparatus |
Oct. 22, 2002 |
| 6390200 |
Drop ball sub and system of use |
May. 21, 2002 |
| 6371207 |
Method and apparatus for displacing drilling fluids with completion and workover fluids, and for cleaning tubular members |
Apr. 16, 2002 |
| 6311775 |
Pumpdown valve plug assembly for liner cementing system |
Nov. 6, 2001 |
| 6311771 |
Plug for use in wellbore operations and apparatus for launching said plug |
Nov. 6, 2001 |
| 6237686 |
Cementing plug |
May. 29, 2001 |
| 6209637 |
Plunger lift with multipart piston and method of using the same |
Apr. 3, 2001 |
| 6202748 |
Multi-stage maintenance device for subterranean well tool |
Mar. 20, 2001 |
| 6200103 |
Gas lift plunger having grooves with increased lift |
Mar. 13, 2001 |
| 6170573 |
Freely moving oil field assembly for data gathering and or producing an oil well |
Jan. 9, 2001 |
| 6082451 |
Wellbore shoe joints and cementing systems |
Jul. 4, 2000 |
| 6050336 |
Method and apparatus to isolate a specific zone |
Apr. 18, 2000 |
| 6038725 |
Unicast paraffin removing pipeline pig incorporating multiple diameter and thickness discs and having a central bending portion for turns |
Mar. 21, 2000 |
| 6009944 |
Plug launching device |
Jan. 4, 2000 |
| 5884700 |
Interior coating of gas well tubing |
Mar. 23, 1999 |
| 5871052 |
Apparatus and method for downhole tool deployment with mud pumping techniques |
Feb. 16, 1999 |
| 5836386 |
Wiping element for a drill pipe ID wiping device |
Nov. 17, 1998 |
| 5813457 |
Wellbore cementing system |
Sep. 29, 1998 |
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