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| Number | Title | Issue Date |
| 7275605 | Rotatable drill shoe A rotatable drilling shoe attachable to a section of casing that allows for drilling and casing of a well bore in a single trip. The drilling shoe includes a fixed section and a rotatable section that has a drillable bit attached thereto. The drilling shoe further i... | 10/02/2007 |
| 6834889 | Torque release coupling for use in drill strings This invention relates to a torque release coupling for use in drill strings comprising an outer string part (1) rotatably mounted outside a radially inner string part (2), and a rotation lock (3) positioned between them. The rotation lock (3... | 12/28/2004 |
| 5083623 | Hydraulic shock absorber A shock absorber apparatus for inclusion in a tool string which consists of outer and inner casings telescopically assembled with one casing having an uphole threaded joint member and the other casing having a downhole threaded joint member. The concentri... | 01/28/1992 |
| 4512424 | Tubular spring slip-joint and jar The present invention comprises a pressure balanced tubular spring slip-joint and jar including a generally tubular outer housing having longitudinal slot means in the wall thereof, and a hammer area of increased wall thickness at one end thereof, within ... | 04/23/1985 |
| 4343369 | Apparatus for drilling straight portion of a deviated hole A guide for drilling a straight section of a bore hole deflected from the vertical. The apparatus comprises either a normally straight or a curved-straight tubular member which has a plurality of generally circumferential cuts disposed along the length of... | 08/10/1982 |
| 4233820 | Flexible drill pipe According to the invention a flexible drill pipe constructed of a closed pitch cylindrical spiral coil of wire rod, a female tool joint is attached to one end of the coil of wire rod and a male tool joint is attached to the other end. A plurality of wire ... | 11/18/1980 |
| 4181344 | Running tool Disclosed is a running tool for running sensitive well equipment into a well. Once the well equipment has been landed in the well, the running tool releases therefrom upon the application of a steady force. This abstract of the disclosure is neither inten... | 01/01/1980 |
| 4149391 | Flexible drill pipe According to the invention a flexible drill pipe constructed of a closed pitch cylindrical spiral coil of wire rod, a female tool joint is attached to one end of the coil of wire rod and a male tool joint is attached to the other end. A plurality of wire ... | 04/17/1979 |
| 4130000 | Drill string shock absorber A shock absorber from an oil well drill string mounted therein adjacent its drill bit to cushion drill bit impacts in hard formations and having an elongate tubular mandrel, for connection with said bit, slidably mounted in and drivingly connected to an e... | 12/19/1978 |
| 4106779 | Automatic sequential dual action sealing system A shock absorbing subassembly with a body, a mandrel slidably and non-rotatively received in the body, dampening means therebetween, an upper seal above the dampening means and a floating seal therebelow for maintaining an oil bath between the body and th... | 08/15/1978 |
| 4031713 | Flexible drill pipe According to the invention a flexible drill pipe constructed of a closed pitch cylindrical spiral coil of wire rod with a floating core of tube sections constructed the same positioned end to end but not attached through the hollow center of the coil of w... | 06/28/1977 |
| 4031716 | Automatic sequential dual action sealing system A shock absorbing subassembly with a body, a mandrel slidably and non-rotatively received in the body, dampening means therebetween, an upper seal above the dampening means and a floating seal therebelow for maintaining an oil bath between the body and th... | 06/28/1977 |
| 3963228 | Drill string shock absorber In accordance with an illustrative embodiment of the present invention as disclosed herein, a shock absorber adapted to be incorporated in a drill string includes axially splined housing and mandrel members having a helical coil spring reacting therebetwe... | 06/15/1976 |
| 3958649 | Methods and mechanisms for drilling transversely in a well Two methods and four mechanisms are disclosed for drilling at right angles to a vertical well at any location or depth in the well. The drilling mechanisms each comprises a flexible spring biased telescopic fluid conduit having a turbodrill on the lower e... | 05/25/1976 |
