| Patents for E21B 33 - Sealing or packing boreholes or wells (33,564) |
|---|
| 07/27/1976 | US3971437 Apparatus for dewatering boreholes |
| 07/27/1976 | US3971436 Cementing head |
| 07/27/1976 | US3971171 Debris cap mechanism for a subsea wellhead |
| 07/20/1976 | US3970145 Standing valve assembly |
| 07/20/1976 | US3970144 Subsurface shutoff valve and control means |
| 07/13/1976 | US3968656 Marine structure with hydraulic tensioner |
| 07/06/1976 | US3967678 Stuffing box control system |
| 07/06/1976 | US3967462 Method and apparatus for joining a subsea pipeline to an offshore platform riser |
| 06/29/1976 | US3966235 Underwater sealing of exposed ports in relatively closable members |
| 06/29/1976 | US3965987 Method of sealing the annulus between a toolstring and casing head |
| 06/29/1976 | US3965978 Subsurface transient pressure testing apparatus and method of use thereof |
| 06/29/1976 | US3965977 Control line exiting coupling |
| 06/22/1976 | US3964305 Apparatus for testing oil wells |
| 06/15/1976 | US3963654 Impression material for use in an impression packer |
| 06/08/1976 | US3961667 Hydraulically actuated wire line apparatus |
| 06/01/1976 | US3960366 Reverse acting lock open crossover valve |
| 06/01/1976 | US3960215 Method and apparatus for performing sequentially timed operations in a well |
| 06/01/1976 | US3960212 Method of obtaining impression information from a well |
| 06/01/1976 | US3960211 Gas operated hydraulically actuated wire line packer |
| 06/01/1976 | US3960014 Method of obtaining permeability information from an underground formation penetrated by a well |
| 06/01/1976 | US3959987 Self-engaging and aligning shaft coupling |
| 05/25/1976 | US3958808 Controlled closing pattern packing unit for blowout preventer |
| 05/25/1976 | US3958640 Method of drilling an oil well to recover casings |
| 05/25/1976 | US3958639 Method of drilling an oil well to recover casings |
| 05/25/1976 | US3958637 Technique for lining shaft |
| 05/25/1976 | US3958632 Well pipe connector |
| 05/18/1976 | US3957114 Well treating method using an indexing automatic fill-up float valve |
| 05/18/1976 | US3957079 Valve assembly for a subsea well control system |
| 05/11/1976 | US3955822 Rod pump stuffing box control system |
| 05/11/1976 | US3955625 Cementing basket |
| 05/11/1976 | US3955622 Dual drill string orienting apparatus and method |
| 05/04/1976 | US3953982 Method and apparatus for laying and connecting flow lines to submerged structures |
| 04/27/1976 | US3953037 Polished rod protector and receiver |
| 04/27/1976 | US3952799 Apparatus for borehole drilling |
| 04/27/1976 | US3952763 Sequence control valve |
| 04/20/1976 | US3951211 Method for selectively retrieving a plurality of well packers |
| 04/20/1976 | US3951208 Technique for cementing well bore casing |
| 04/13/1976 | US3949811 Method for reducing the permeability of subterranean formations to brines |
| 04/06/1976 | US3948545 Mechanically operated breech block |
| 04/06/1976 | US3948322 Multiple stage cementing tool with inflation packer and methods of use |
| 03/30/1976 | US3946807 Well tools |
| 03/30/1976 | US3946806 Ram-type blowout preventer |
| 03/30/1976 | US3946805 Underwater connections at well head locations |
| 03/30/1976 | US3946569 Method and means for installing a post |
| 03/23/1976 | US3945436 Method and apparatus for cleansing well liner and adjacent formations |
| 03/23/1976 | US3945213 Subsea wellhead shielding and shock mitigating system |
| 03/16/1976 | US3944273 Retrieving tool for wellhead packing |
| 03/16/1976 | US3943997 Rotary drilling apparatus and method |
| 03/02/1976 | US3941190 Well control apparatus |
| 03/02/1976 | US3941189 Subsurface wellhead shield |
| 03/02/1976 | US3941141 Blowout preventer locking apparatus and method |
| 02/24/1976 | US3939910 Stuffing box and blow out preventing device for polish rods of oil well pumping units |
| 02/24/1976 | US3939909 System of suppressing the discharge casing string in deep-well vertical pumps |
| 02/10/1976 | US3937251 Fluid pressure operated shut off valve apparatus |
| 02/03/1976 | US3935910 Method and apparatus for moulding protective tubing simultaneously with bore hole drilling |
| 02/03/1976 | US3935903 Well tubing protective fluid injection system |
| 01/27/1976 | US3934887 Rotary drilling head assembly |
| 01/27/1976 | US3934652 Apparatus and method for cementing well liners |
| 01/27/1976 | US3934648 Well tubing system with orienting coupling means |
| 01/27/1976 | US3934528 Means and methods for anchoring an offshore tension leg platform |
| 01/20/1976 | US3933376 Removable packer and tesnion slip assembly |
| 01/20/1976 | US3933204 Plugging subterranean regions with acrylic-epoxy resin-forming emulsions |
| 01/20/1976 | US3933202 Apparatus for setting and locking packing assemblies in wellheads |
| 01/13/1976 | US3931855 Downhole packer actuated vent assembly |