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| Number | Title | Issue Date |
| 6439310 | Real-time reservoir fracturing process Methods are disclosed for hydraulic fracturing of subterranean reservoir formations using various combinations of gelled fluid, nitrogen, and carbon dioxide base components, in association with proppant and other additives. Selected base components are pu... | 08/27/2002 |
| 6302205 | Method for locating a drill bit when drilling out cementing equipment from a wellbore A method for locating a drill bit when drilling out cementing equipment from a casing of a wellbore. A first step involves placing in the casing of the wellbore at the time of placing cementing equipment, at least one coloured marker member. A second step... | 10/16/2001 |
| 6125934 | Downhole tool and method for tracer injection An injection apparatus and use thereof that comprises a plurality of spaced ejection ports from which the tracer composition can be ejected so as to be injected directly into a chosen layer of a stratified flow, and that in use can be adjusted such that t... | 10/03/2000 |
| 6125786 | Underground warning system for underground conduits or pipes The invention provides a warning to the excavation above a pipe, conduit or cable laid underground by a service utility by the directional drilling method by providing a coloured area of drilling mud and/or soil about the pipe, conduit or cable. A colouri... | 10/03/2000 |
| 6003365 | Characterization of organic contaminants and assessment of remediation performance in subsurface formations Characterization of organic contaminants in subsurface formation is performed by methods for detecting the presence of nonaqueous phase liquid in a subsurface formation, and for determining the composition and for determining the volume of nonaqueous phas... | 12/21/1999 |
| 5595245 | Systems of injecting phenolic resin activator during subsurface fracture stimulation for enhanced oil recovery In connection with downhole placement of proppant materials for the purpose of enhancing oil recovery through a subsurface fracture-stimulation treatment, phenolic resin activator is injected after resin-coated proppant is pumped. The results are a reduce... | 01/21/1997 |
| 5413179 | System and method for monitoring fracture growth during hydraulic fracture treatment A tracer system can monitor in real-time the propagation of a fracture through a rock formation traversed by a well borehole, during hydraulic fracturing processes. The inventive system permits continuous measurement of the movement of gamma-emitting trac... | 05/09/1995 |
| 5246861 | Use of nonradioactive complex metal anion as tracer in subterranean reservoirs Complex metal anions such as cobaltic hexacyanide are utilized as nonradioactive tracers in reservoir studies. Sensitive analytical procedures enable detection and measurement of very low tracer levels.... | 09/21/1993 |
| 5212093 | Method to determine drift and residual oil saturation Drift or residual oil saturation within a reservoir around a wellbore is determined by injection of a water-soluble tracer and then producing from the well. This injection is performed twice. The first injection is immediately followed by production in or... | 05/18/1993 |
| 5072387 | Method for determining a transit time for a radioactive tracer An improved method for deteriming the transit time of a radioactive tracer for steam injection profiles in steam injection wells is disclosed. Radiation decay data is collected at two detectors at different depths. The data is then transformed into a new ... | 12/10/1991 |
| 5031697 | Method for troubleshooting gas-lift wells A method is provided for troubleshooting gas-lift wells, to identify whether gas-lift valves on the production tubing are open or closed, without the use of wireline tools. The method may also be used to detect leaks in the production tubing or in the wel... | 07/16/1991 |
| 4788848 | Chemical tracer determination of steam quality A method and means for determining the quality of steam in a flowing steam line is disclosed. A tracer solution is injected into a steam flow line. The tracer solution contains a liquid tracer that will reside almost entirely in the liquid phase and a vap... | 12/06/1988 |
| 4722394 | Determining residual oil saturation by radioactively analyzing injected CO2 and base-generating tracer-providing solution Residual oil saturation is determined by injecting water containing CO2, a base-generating material and at least one radioactively labeled material which is or becomes a selectively water-soluble tracer material mixed with the injected CO2... | 02/02/1988 |
| 4501324 | Method for identifying the source of an oil A method for tagging an oil so that subsequently it may be identified as to source by incorporating into the oil as a tracer material a minor amount of certain halohydrocarbons or halocarbons, utilizing the so-tagged oil in any desired manner wherein cont... | 02/26/1985 |
| 4420565 | Method for determining flow patterns in subterranean petroleum and mineral containing formations The method for determining flow patterns within a subterranean formation penetrated by a spaced apart injection system and production system that comprises injecting into the formation at a predetermined depth from the injection system a solution containi... | 12/13/1983 |
| 4223725 | Method for reservoir fluid drift rate determination The magnitude of fluid drift rate at a well in a reservoir is determined by first injecting a known volume of a fluid containing a tracer, then shutting in the well for a period of time to allow movement of the injected tracer fluid, then producing said w... | 09/23/1980 |
| 4058366 | Determination of flow characteristics of petroliferous formations A method for determining the flow characteristics of subterranean petroliferous formations by injecting a tracer and a polysaccharide polymer having glucose moieties into said formation, recovering said tracer and polysaccharide from production well efflu... | 11/15/1977 |
