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Class Information
Number: 250/260
Name: Radiant energy > Geological testing or irradiation > Well testing apparatus and methods > With placement of tracer in or about well > Tracer being or including radioactive material
Description: Subject matter wherein the added material is radioactive or contains radioactive material entrained in a substance added to the well.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7432499 |
Method and apparatus for detecting while drilling underbalanced the presence and depth of water produced from the formation |
Oct. 7, 2008 |
| 7323341 |
Stable isotopic identification and method for identifying products by isotopic concentration |
Jan. 29, 2008 |
| 7212283 |
Imaging sensor optical system |
May. 1, 2007 |
| 6472660 |
Imaging sensor |
Oct. 29, 2002 |
| 6037585 |
Determination of radioactive scale distribution using gamma ray logging technique |
Mar. 14, 2000 |
| 6001280 |
Oil-soluble tracer solutions containing gadolinium compounds |
Dec. 14, 1999 |
| 5929437 |
Encapsulated radioactive tracer |
Jul. 27, 1999 |
| 5723781 |
Borehole tracer injection and detection method |
Mar. 3, 1998 |
| 5711900 |
Gadolinium compounds for use as oil-soluble tracers |
Jan. 27, 1998 |
| 5635712 |
Method for monitoring the hydraulic fracturing of a subterranean formation |
Jun. 3, 1997 |
| 5569914 |
Method for measuring height of fill in a production tubing/casing annulus |
Oct. 29, 1996 |
| 5543617 |
Method of measuring flow velocities using tracer techniques |
Aug. 6, 1996 |
| 5442173 |
Method and system for real-time monitoring of earth formation fracture movement |
Aug. 15, 1995 |
| 5413179 |
System and method for monitoring fracture growth during hydraulic fracture treatment |
May. 9, 1995 |
| 5410152 |
Low-noise method for performing downhole well logging using gamma ray spectroscopy to measure radioactive tracer penetration |
Apr. 25, 1995 |
| 5404010 |
Method of well logging in fractured subterranean formation |
Apr. 4, 1995 |
| 5322126 |
System and method for monitoring fracture growth during hydraulic fracture treatment |
Jun. 21, 1994 |
| 5306911 |
Method for determining the flow rate of aqueous phases in a multiphase flow |
Apr. 26, 1994 |
| 5285065 |
Natural gamma ray logging sub |
Feb. 8, 1994 |
| 5267274 |
Method of fission track analysis utilizing bulk chemical etching of apatite |
Nov. 30, 1993 |
| 5250807 |
Sand detector |
Oct. 5, 1993 |
| 5243190 |
Radioactive tracing with particles |
Sep. 7, 1993 |
| 5225674 |
Method of delineating naturally fractured intervals in subterranean formations |
Jul. 6, 1993 |
| 5219518 |
Nuclear oxygen activation method and apparatus for detecting and quantifying water flow |
Jun. 15, 1993 |
| 5191210 |
Produced steam survey device and method |
Mar. 2, 1993 |
| 5182051 |
Raioactive tracing with particles |
Jan. 26, 1993 |
| 5164591 |
Radioactive tracer well logging utilizing bromine |
Nov. 17, 1992 |
| 5077471 |
Method and apparatus for measuring horizontal fluid flow in downhole formations using injected radioactive tracer monitoring |
Dec. 31, 1991 |
| 5072387 |
Method for determining a transit time for a radioactive tracer |
Dec. 10, 1991 |
| 5049743 |
Surface located isotope tracer injection apparatus |
Sep. 17, 1991 |
| 5047632 |
Method for determining dynamic flow characteristics of multiphase flows |
Sep. 10, 1991 |
| 5045692 |
Simultaneous fluid flow and fluid density measurements using rotameter and nuclear technology |
Sep. 3, 1991 |
| 5023819 |
Linear shaped filter |
Jun. 11, 1991 |
| 5005422 |
Method and apparatus for measuring subsidence |
Apr. 9, 1991 |
| 5001342 |
Radioactive tracer cement thickness measurement |
Mar. 19, 1991 |
| 4939361 |
Method for correcting gamma ray spectra for borehole tracer interference |
Jul. 3, 1990 |
| 4926940 |
Method for monitoring the hydraulic fracturing of a subsurface formation |
May. 22, 1990 |
| 4916312 |
Device for placing a radioactive source in a formation through which a borehole passes |
Apr. 10, 1990 |
| 4877956 |
Closed feedback injection system for radioactive materials using a high pressure radioactive slurry injector |
Oct. 31, 1989 |
| 4876449 |
Reservoir evaluation using partitioning tracer |
Oct. 24, 1989 |
| 4864128 |
Method of introducing a radioactive substance into a well |
Sep. 5, 1989 |
| 4861986 |
Tracer injection method |
Aug. 29, 1989 |
| 4857728 |
Method and apparatus for reducing radioactive hazards in well boreholes |
Aug. 15, 1989 |
| 4857234 |
Method for making a partitioning radioactive tracer |
Aug. 15, 1989 |
| 4857729 |
Method of radioactive well logging |
Aug. 15, 1989 |
| 4825073 |
Method for determining depth of penetration of radioactive tracers in formation fractures |
Apr. 25, 1989 |
| 4825072 |
Method and apparatus for determining well fluid flow velocity using a nonradioactive tracer |
Apr. 25, 1989 |
| 4799552 |
Method and apparatus for injecting radioactive tagged sand into oil and gas wells |
Jan. 24, 1989 |
| 4786805 |
Reusable radioactive material shipping container including cartridge and injector |
Nov. 22, 1988 |
| 4771635 |
Fluid injector for tracer element well borehole injection |
Sep. 20, 1988 |
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