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| Number | Title | Issue Date |
| 5962375 | Wellbore fluids Wellbore fluids are disclosed which comprise liquid dispersions of particulate mixed divalent metal carbonates having a generally platy crystal form. Mixed alkaline earth metal carbonates are preferred. The invention further relates to a method of well co... | 10/05/1999 |
| 5929002 | Fluid loss control The invention, in one embodiment, relates to a fluid loss control additive or composition comprising a granular starch composition and fine particulate mica, in specified proportions. The invention further comprises a fracturing fluid containing a starch ... | 07/27/1999 |
| 5846913 | Invert biodegradable n-alkane(s) wellbore fluid containing less than 10 percent by weight of cycloparaffing isoparaffing and aromatic compounds, and method of drilling with such fluid The invention concerns wellbore fluids suitable for use in the oil and gas exploration and production industries and embraces fluids used for drilling, completion, workover or packing of wellbores. The invention is especially concerned with biodegradable ... | 12/08/1998 |
| 5821203 | Foamed drilling fluids, their process for preparation and the corresponding drilling method The present invention is directed to an aqueous foamed Drilling Fluid for drilling well bores into a subterranean formation, comprising water, at least one clay and at least one foaming agent. According to the invention, it further comprises at least one ... | 10/13/1998 |
| 5720598 | Method and a system for early detection of defects in multiplex positive displacement pumps A method and a system for the early detection of defects in at least one multiplex pump, which includes a plurality of cylinders or chambers, by determination and analysis of pump harmonics based upon pressure fluctuations in a line in fluid communication... | 02/24/1998 |
| 5660241 | Pressure compensated weight on bit shock sub for a wellbore drilling tool A drilling tool, adapted to drill a wellbore in an earth formation, comprises a weight on bit equalizer shock sub. The weight on bit equalizer shock sub includes a precharged nitrogen chamber and additional chambers, the nitrogen in the nitrogen chamber a... | 08/26/1997 |
| 5613555 | Inflatable packer with wide slat reinforcement A slat-type inflatable packer includes a plurality of longitudinal metal slats on the exterior thereof which are partially overlapping to allow expansion of the packer element while providing a barrier against extrusion. In one embodiment each slat has na... | 03/25/1997 |
| 5582250 | Overbalanced perforating and fracturing process using low-density, neutrally buoyant proppant The present process permits the use of more efficient, low viscosity fluids to efficiently perforate and fracture a subterranean formation in an overbalanced condition in the wellbore. In accordance with the invention, a method of decreasing the resistanc... | 12/10/1996 |
| 5507341 | Inflatable packer with bladder shape control An inflatable packer assembly used in well service work and having a mandrel that carries a normally retracted inflatable packer unit. The unit includes an inner elastomer bladder surrounded by a reinforcement. To control the shape of the unit during infl... | 04/16/1996 |
