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| Number | Title | Issue Date |
| 7275606 | Solids strainer system for a hydraulic choke The invention contemplates a strainer based upon a four-way, two-position rotary cylindrical plug valve having a hollow plug. The normal entry port for the sealing plug of the plug valve is a circular radial hole passing from the exterior of the plug into the interi... | 10/02/2007 |
| 7243742 | Drill pipe screen A retrievable drill pipe screen is adapted for releasable connection within a drill pipe string. The screen has a planar support plate for connecting a perforated tubular screen body to a fish neck wherein the plane of the planar support plate is generally parallel ... | 07/17/2007 |
| 7188687 | Downhole filter A downhole filter comprises a tubular member having a wall defining a plurality of openings. The openings have an outer width less than an inner width. The parts of the opening defining the smaller width are defined by radially outer parts of the openings, such that... | 03/13/2007 |
| 7188688 | Down-hole tool filter and method for protecting such tools from fluid entrained debris An improved apparatus for filtering down-hole drilling fluids, insertable at any point in the drill string, i.e.: tool joints or within instrument subs. The filter element is a disk insertable between the two threadably connected ends of any two lengths of the drill... | 03/13/2007 |
| 6981561 | Downhole cutting mill A downhole device processes particles entrained in a drilling fluid returning up a wellbore. In one embodiment, the device includes a housing having at least one cutting surface formed in a chamber of a housing. A cutting head disposed in the chamber crushes or comm... | 01/03/2006 |
| 6951251 | Junk basket and method Junk basket 10 is provided for collecting debris from a wellbore cleaning operation, and includes a central mandrel 14 having a throughbore 16 and an outer shell 24 defining a generally annular junk space 40. The outer shell 24 | 10/04/2005 |
| 6715570 | Two stage downhole drilling fluid filter A two stage filter for drilling fluid using downhole tools filters solid materials from the drilling fluid and has a first, outer filter section and a second, inner filter section. A portion of the drilling fluid flowing through the first section is received by the ... | 04/06/2004 |
| 6431292 | Device for drilling and draining holes in soil or rock The invention relates to a device (1) for the drilling, notably by percussion or rotary-percussion drilling, and draining of holes in soil or rock. A drill bit (2, 3) mounted on a drill rod (4) creates a bore hole and a jacket tube (6) is coupled to the d... | 08/13/2002 |
| 6276452 | Apparatus for removal of milling debris An apparatus and method for drawing small milling debris into a combination milling and debris retrieval tool, during the performance of the milling operation. A milling tool has a fluid intake port near its lower end, where debris-laden fluid is drawn in... | 08/21/2001 |
| 5682950 | Means for collecting unwanted material in an oil or gas well Means for collecting and bringing up unwanted material from an oil or gas well, the means thereby comprising a grinder or mill (6) and a coating (8) of a wear resistant material along its front and outer surfaces, the mill (6) being secured to a throughgo... | 11/04/1997 |
| 5176208 | Reverse circulation tool handling cuttings and debris A device for providing fluid cross over in a milling operation is set forth. It is particularly used by connection to a pipe string which supports the milling device for cutting junk from a well. It features an elongate hollow tool body having a central p... | 01/05/1993 |
| 4341273 | Rotary bit with jet nozzles A jet rotary drill bit confirming a first strainer element allowing the passage of mud carrying small-sized particles, but preventing relatively coarse particles from passing to the jet nozzles. The first strainer element is self-cleaning and the relative... | 07/27/1982 |
| 4336850 | Internal fluid screen to prevent nozzle and port plugging A strainer is shown for use with a downhole tool through which drilling fluid is circulated during the drilling of deep oil wells and the like. The strainer provides a plurality of narrow slots which prevent the passage of material therethrough that might... | 06/29/1982 |
| 4189012 | Earth boring tool A roller reamer body is provided with junk receiving pockets that are downward extensions of the body cavities in which the rollers and their shaft mounting blocks are disposed. The slots have upwardly slidably openable or removable outside wall panels so... | 02/19/1980 |
| 4060140 | Method and apparatus for preventing debris build-up in underwater oil wells An improved method and apparatus for preventing buildup of cuttings or debris in underwater oil wells. The apparatus includes a drilling tool in the form of a primary tubular member having an internal diameter a predetermined amount greater than the exter... | 11/29/1977 |
