Did You Know...
...that Thomas Edison's patent application on his phonograph was approved by the Patent Office in just seven weeks? In contrast, it took Gordon Gould, the inventor of the laser, 30 years to obtain his patent -- finally awarded in 1988!
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| Number | Title | Issue Date |
| 7775302 | Casing shoe and retrievable bit assembly An earth boring bit assembly has a tubular mandrel carried by a casing shoe at the lower end of a string of casing. The casing shoe has stabilizer blades spaced circumferentially apart from each other. A cutter arm seat is formed on the leading edge of each blade at... | 08/17/2010 |
| 7188672 | Well string assembly A well string assembly includes an upper tubular well string part having upper and lower ends between which there is formed a passageway, a lower well string part having upper and lower ends, which lower end is spaced apart from the lower end of the upper well strin... | 03/13/2007 |
| 7165634 | Method 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... | 01/23/2007 |
| 7147068 | 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... | 12/12/2006 |
| 7048050 | Method 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... | 05/23/2006 |
| 7036610 | Apparatus and method for completing oil and gas wells A method of drilling and completing a wellbore in a geological formation to produce hydrocarbons from a well comprising at least the following four steps: drilling the well with a retrievable drill bit attached to a casing; removing the retrievable drill bit from th... | 05/02/2006 |
| 6206114 | Tool for transporting cutting means to and from a ground drill A down hole running tool 14 travels in a first direction through a drill pipe for installing bit segments 18 at the end of a drive sub 12 attached to the drill pipe. The tool 14 includes a first portion 82 and a second portion 84 which is retractably coup... | 03/27/2001 |
| 6059053 | Retraction system for a latching mechanism of a tool A retraction system allows disengagement of retrieval latch dogs of a down hole running tool from a bit locking sleeve. The locking sleeve is slidably retained within a drive sub and includes a pair of slots which are engaged by the retrieval latch dogs w... | 05/09/2000 |
| 5009271 | Drill assembly Drill tools with eccentric bits for drilling a hole having a large diameter generally include a bit for swinging out to an eccentric position for drilling, and for swinging into a non-eccentric position for removal from a tubular casing. Relatively compli... | 04/23/1991 |
| 5009274 | Laterally adjustable drilling tool A drilling tool is followed by a casing tube (11) down the drilled hole. The mouth of the casing tube (11) centers rotatably a guide member (10) which receives rotation and impact energy via the interior of the casing tube (11). A drill bit (20) consists ... | 04/23/1991 |
| 4878549 | Wire line core barrel A core sampling device comprising a drill bit assembly, a drive shoe arranged to house the drill bit, a core sampling tube and a retraction tube. The drill bit assembly includes a bit housing, which is drivingly engaged by the drive shoe, and a series of ... | 11/07/1989 |
| 4651837 | Downhole retrievable drill bit A rotary well-drilling bit lowered through a drill string to a special orienting, positioning and aligning sub attached to the bottom of the drill string with the aid of mud pressure with the bit approximately 90° from its normal operating position. The ... | 03/24/1987 |
| 4550788 | Roof bolt hole groover A hole groover comprising a pair of grooving bits radially protruding from the surface of a drill rod and connected to swivel upwardly and downwardly near the end of the drill rod where the drill bit is connected. A connecting rod is connected to the insi... | 11/05/1985 |
| 4497382 | Retractable core drill bit Retractable core drill bit having a hollow cylindrical body at its lower end to which a monolith core drill bit is screwed. A stop sleeve is provided on the upper end of the hollow cylindrical body, and cutting components are pivotally mounted in the midd... | 02/05/1985 |
| 4470470 | Boring apparatus A boring apparatus comprises a drill pipe for being placed underground, an outer tube insertable into the drill pipe, and an inner tube axially movably inserted in the outer tube. The inner tube is locked against relative movement with respect to the dril... | 09/11/1984 |
| 4384627 | Retractable well drilling bit A retractable well drilling bit comprises a hollow body which forms the lowermost end of the drilling string; a pair of colinear cylindrical hollow members slidable within the bore of said hollow body; a pair of knives; a vertical rod attached to the lowe... | 05/24/1983 |
| 4281722 | Retractable bit system A retractable bit system that includes a single piece annular core bit that is movable through a drill string (drill stem), had an outer diameter about the same as that of the drill stem, and can be releasably locked to the drill string, an outer barrel a... | 08/04/1981 |
| 3965996 | Means and method of drilling wells A means and method of drilling wells wherein the casing and tubing string are rotated with minimum interruption and are moved downwardly simultaneously. A bit assembly, capable of cutting a bore larger than the casing, is lowered and raised through the dr... | 06/29/1976 |
