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| Number | Title | Issue Date |
| 7117939 | Percussion hammer bit retainer apparatus A bit retention apparatus for the use of retrieving the hammer bit in cases of shankage. The apparatus incorporates a dual sleeve design that fits over the chuck and the extended head section of the hammer bit. The first, “inner” sleeve has two or more ring piec... | 10/10/2006 |
| 7100710 | Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells The steel drill string attached to a drilling bit during typical rotary drilling operations used to drill oil and gas wells is used for a second purpose as the casing that is cemented in place during typical oil and gas well completions. Methods of operation are des... | 09/05/2006 |
| 7013997 | Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells The steel drill string attached to a drilling bit during typical rotary drilling operations used to drill oil and gas wells is used for a second purpose as the casing that is cemented in place during typical oil and gas well completions. Methods of operation are des... | 03/21/2006 |
| 6962215 | Underbalanced well completion Equipment and methods which may be used in conjunction with an underbalanced well completion. In a described embodiment, a valve for use in a subterranean well in conjunction with a tool conveyed through the valve in a container is provided. The valve includes a pas... | 11/08/2005 |
| 6655475 | Product and method for treating well bores A product, system and method for treating a well bore using a concentrated treatment composition enclosed in a soluble container. The composition-filled container is deposited in the well, preferably through the drill string, followed by a solvent, such a... | 12/02/2003 |
| 6047782 | Assembly and method for extracting discrete soil samples An assembly for extracting discrete soil samples from subsurface soil at a lurality of selected depths includes an elongated outer tubular housing, and a soil sample tube for disposal in the outer tubular housing. The soil sample tube is movable axially in... | 04/11/2000 |
| 5954146 | System for in situ replacement of cutting means for a ground drill A retractable drill bit system 10 comprises a drive sub 18 which is adapted for connection to a lower end of a drill 12, a tool 20 for installing and retracting drill bit segments 22 from the drive sub 18; and an insert 24 for selectively locking the bit ... | 09/21/1999 |
| 5337838 | Method and an apparatus for taking and analyzing level determined samples of pore gas/liquid from a subterranean formation A method and an apparatus serve to take and analyze level determined samples of pore gas/liquid, e.g. water from a subterranean formation, in which a borehole is drilled and pore gas/liquid samples are conveyed at a desired depth into a cavity in the dril... | 08/16/1994 |
| 4790395 | Pipe-driving apparatus Pipe-driving apparatus used to create a pipe line of small diameter uses a pressing station in an access trench to drive in pipe sections one by one. A boring head and conveyor worm operates at the front of the pipe line in a working pipe section on which... | 12/13/1988 |
| 4336849 | Earth drilling device for extracting earth samples An earth drilling device for extracting earth samples including a rotatable drill tube and means for rotating said drill tube, a drill bit supported by said rotatable drill tube, said drill bit and said drill tube defining an inner shoulder, a hollow prob... | 06/29/1982 |
| 4006777 | Free floating carrier for deep well instruments A carrier and contained well instrument which are light enough to float in the fluid in a well are forced downwardly in the well to a predetermined test zone by downward movement of the fluid. After performance of a testing operation by the instrument, th... | 02/08/1977 |
