| Patents for E21B 37 - Methods or apparatus for cleaning boreholes or wells (5,129) |
|---|
| 12/13/1977 | US4062403 Pump-down sand washing tool |
| 11/29/1977 | US4060130 Cleanout procedure for well with low bottom hole pressure |
| 11/01/1977 | US4056335 Subsurface pumping installation for handling viscous or sand-laden fluids |
| 09/27/1977 | US4050514 Paraffin sucker rod scraper and rod centralizer |
| 09/20/1977 | US4049057 Paraffin cleaner |
| 09/06/1977 | US4046199 Steam injection apparatus and method |
| 08/23/1977 | US4043150 Safety sleeve |
| 08/09/1977 | US4040486 Method and apparatus for air development and rejuvenation of water wells |
| 07/26/1977 | US4037661 Method and apparatus for cleaning a screened well |
| 07/26/1977 | US4037660 Method for steam cleaning liners in oil well bores |
| 07/12/1977 | US4034807 Inside pipe wiper |
| 06/21/1977 | US4030545 Apparatus for cleansing well liner and adjacent formations |
| 06/07/1977 | US4027732 Tool for washing perforations in cased well bore |
| 03/15/1977 | US4011906 Downhole valve for paraffin control |
| 02/15/1977 | US4007784 Well piston and paraffin scraper construction |
| 12/07/1976 | US3995695 Method for completing a well in a permafrost zone |
| 11/02/1976 | US3989106 Swab device |
| 10/05/1976 | US3983938 Freely slidable paraffin scraping and removing tool for cleaning oil well tubing |
| 09/28/1976 | US3982590 Well bore cleaning device |
| 09/21/1976 | US3981364 Well tubing paraffin cutting apparatus and method of operation |
| 08/10/1976 | US3973630 Wash-out tool and method of use thereof |
| 07/27/1976 | US3971437 Apparatus for dewatering boreholes |
| 07/20/1976 | US3970146 Sonic cleaning of wells |
| 05/25/1976 | US3958641 Self-decentralized hydra-jet tool |
| 04/20/1976 | US3951827 Composition and method for removing insoluble scale deposits from surfaces |
| 03/30/1976 | US3946819 Well tool and method of use therefor |
| 03/23/1976 | US3945436 Method and apparatus for cleansing well liner and adjacent formations |
| 03/16/1976 | US3943997 Rotary drilling apparatus and method |
| 01/06/1976 | US3930539 Method of obtaining increased production in wells |