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| Number | Title | Issue Date |
| 7287606 | Drilling method for enlarging a borehole using a kick sub A drill string is fitted at the lower end with a drill string deflecting apparatus and a drill bit. The drill string deflecting apparatus is activated to deflect the drill bit from the general center line of the drill string. Drilling proceeds to enlarge a length of... | 10/30/2007 |
| 6585048 | Wellbore system having non-return valve In a wellbore system, non-return valves placed in one or more well boreholes within the system. The valves are placed in the production string downstream from the producing zones, the valve having a closure member selectively biased to a closed position a... | 07/01/2003 |
| 6053261 | Flow pulsing method and apparatus for the increase of the rate of drilling A simple and economical device is placed in a drill string to provide a pulsating flow of the pressurized drilling fluid to the jets of the drill bit to enhance chip removal and provide a vibrating action in the drill bit itself thereby to provide a more ... | 04/25/2000 |
| 5979572 | Flow control tool A tool for incorporation in a drill string has an outer body (11, 12, 13) and a spool (17, 18, 19) rotationally and slidably mounted within the body. A cam groove (20) is formed on camming component (17) of the spool and interacts with pins (21) to cause ... | 11/09/1999 |
| 5404953 | Blow-out prevention device for shutting off an annulus between a drill column and a well wall when drilling for oil or gas A blow-out prevention device shuts off an annulus between a drill column and a well wall by means of an expandable sealing device when an unwanted blow-out of fluid and/or gas takes place from an unstable geological well formation when drilling for oil or... | 04/11/1995 |
| 5230390 | Self-contained closure mechanism for a core barrel inner tube assembly A closure mechanism for preventing fluid access to an inner tube of a core barrel assembly is disclosed in which the closure mechanism is configured to move from an open, or unoccluded, condition to an occluded condition in response to increased fluid flo... | 07/27/1993 |
| 5119891 | Adaptor for drilling strings with controllable air passage An adaptor for drilling strings has a head, sleeve and mounting block assembly to secure a drill bit to a drilling string. By reverse rotation of the drilling string, the sleeve is movable between a first position, where pressurized air from the drilling ... | 06/09/1992 |
| 5020612 | Wire line core drilling apparatus A wire line core barrel inner tube assembly has a latch body with a miximum diameter portion providing a shoulder seatable on a drill string landing ring and a fluid bypass channel extending through the maximum diameter portion and a valving assembly. The... | 06/04/1991 |
| 4979577 | Flow pulsing apparatus and method for down-hole drilling equipment Flow pulsing apparatus is adapted to be connected in a drill string above a drill bit. The apparatus includes a housing providing a passage for a flow of drilling fluid toward the bit. A valve which oscillates in the axial direction of the drill string pe... | 12/25/1990 |
| 4832138 | Device to control the locking of a boring corer To control the locking of a cable boring corer (1), a control device (30) is used, comprising a deflecting casing (33), a sleeve (31) and a piston (32), which are movable in relation to the deflecting casing (33). The piston (32) is able to be rendered in... | 05/23/1989 |
| 4452321 | Device in core barrels A device in core drilling for indicating when a core barrel placed in a rotatable hollow drill rod is no longer capable of receiving a further quantity of reamed-out core material includes a valve which at said condition of the barrel constricts the passa... | 06/05/1984 |
| 4406335 | Special circulation sub Special circulation subs mostly consist of an outer barrel which is provided in a cross-sectional plane with three circulation ports, which ports are closed during normal operation of the sub by means of a movable sleeve. The movement of such a sleeve is ... | 09/27/1983 |
| 4331207 | Device for reversing the direction of flow of a fluid at the level of a drill bit This device, positioned above the drill bit, comprises a body provided with an axial bore communicating with the drill string and distribution means, controlling the direction of flow of the flushing fluid, slidably mounted in said bore and having two pos... | 05/25/1982 |
| 4298077 | Circulation valve for in-hole motors An in-hole fluid motor has a stator connected with a fluid conduit and a rotor connected with a drive shaft for a bit to drill a bore hole as drilling fluid is circulated through the conduit and the stator, the fluid returning through the bore hole annulu... | 11/03/1981 |
| 4258803 | Core barrel for obtaining and retrieving subterranean formation samples Core barrel apparatus for obtaining and retrieving sealed core samples of subterranean formations are disclosed. The core barrel comprises a sample chamber for receiving a core sample as it is formed at the bottom of a bore hole and an expansion chamber f... | 03/31/1981 |
| 4142594 | Method and core barrel apparatus for obtaining and retrieving subterranean formation samples Core barrel apparatus and a method for obtaining and retrieving sealed core samples of subterranean formations are disclosed. The core barrel apparatus comprises inner and outer core barrels. The upper portion of the outer core barrel is adapted to be con... | 03/06/1979 |
| 4057118 | Bit packer for dual tube drilling A bit packer for use with a string of dual concentric drill pipe, having inner and outer tubular members concentrically arranged to mate with the inner and outer pipes of the drill string to provide an annular conduit for fluid from surface to bit and a c... | 11/08/1977 |
| 3997009 | Well drilling apparatus Apparatus is disclosed wherein a tubular body connectible in a drill string and having a float valve arranged therein to normally close the string, as the string is lowered into a well bore, is provided with a plurality of ports connecting its bore above ... | 12/14/1976 |
| 3978932 | Apparatus and method for obtaining undisturbed soil core samples Large-diameter, undisturbed soil core samples were obtained from a variety of soils. Handling and fracturing of the undisturbed soil cores were minimized by encasing the cores in heat-shrinkable plastic tubes during sampling operations.... | 09/07/1976 |
| 3949819 | Soil sampling device A device for taking soil samples from a hole drilled in the ground by another tool, and for drilling shallow holes. The device comprises a pneumatic impact mechanism rigidly connected with a soil sampling socket provided with an appliance for holding the ... | 04/13/1976 |
