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Class Information
Number: 73/152.38
Name: Measuring and testing > Borehole or drilling (e.g., drill loading factor, drilling rate, rate of fluid flow) > Fluid flow measuring or fluid analysis > Steady state fluid flow interruption > Drawdown or shutin test
Description: Subject matter wherein a determination of the characteristic of the borehole, the casing, or the drill rigging is made by decreasing a liquid level or completely stopping the flow of the fluid as by the closing of a valve.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7210344 |
Method for measuring formation properties with a time-limited formation test |
May. 1, 2007 |
| 7143826 |
Method for determining sand free production rate and simultaneously completing a borehole |
Dec. 5, 2006 |
| 7066266 |
Method of treating oil and gas wells |
Jun. 27, 2006 |
| 7024930 |
Method for measuring formation properties with a time-limited formation test |
Apr. 11, 2006 |
| 6959762 |
Method and apparatus for formation damage removal |
Nov. 1, 2005 |
| 6530428 |
Method and apparatus for in-situ production well testing |
Mar. 11, 2003 |
| 6364015 |
Method of determining fracture closure pressures in hydraulicfracturing of subterranean formations |
Apr. 2, 2002 |
| 6296056 |
Subsurface measurement apparatus, system, and process for improved well drilling, control, and production |
Oct. 2, 2001 |
| 6148664 |
Method and apparatus for shutting in a well while leaving drill stem in the borehole |
Nov. 21, 2000 |
| 6148912 |
Subsurface measurement apparatus, system, and process for improved well drilling control and production |
Nov. 21, 2000 |
| 5864057 |
Method and apparatus for conducting well production tests |
Jan. 26, 1999 |
| 5383122 |
Method for analyzing pressure buildup in low pumping rate wells |
Jan. 17, 1995 |
| 5092167 |
Method for determining liquid recovery during a closed-chamber drill stem test |
Mar. 3, 1992 |
| 4953137 |
Method for determining earth stresses in formations surrounding a cased well |
Aug. 28, 1990 |
| 4890487 |
Method for determining horizontal and/or vertical permeability of a subsurface earth formation |
Jan. 2, 1990 |
| 4799157 |
Method for uniquely estimating permeability and skin factor for at least two layers of a reservoir |
Jan. 17, 1989 |
| 4790378 |
Well testing apparatus |
Dec. 13, 1988 |
| 4761997 |
Ground water well dimensioning procedure |
Aug. 9, 1988 |
| 4749038 |
Method of designing a fracturing treatment for a well |
Jun. 7, 1988 |
| 4745802 |
Formation testing tool and method of obtaining post-test drawdown and pressure readings |
May. 24, 1988 |
| 4674328 |
Method and apparatus for determining subsurface conditions using a tubing packoff tool |
Jun. 23, 1987 |
| 4553428 |
Drill stem testing apparatus with multiple pressure sensing ports |
Nov. 19, 1985 |
| 4513612 |
Multiple flow rate formation testing device and method |
Apr. 30, 1985 |
| 4461172 |
Well monitoring, controlling and data reducing system |
Jul. 24, 1984 |
| 4408485 |
Rotary straddle tester apparatus with safety joint back-off clutch |
Oct. 11, 1983 |
| 4392377 |
Early gas detection system for a drill stem test |
Jul. 12, 1983 |
| 4372380 |
Method for determination of fracture closure pressure |
Feb. 8, 1983 |
| 4339948 |
Well formation test-treat-test apparatus and method |
Jul. 20, 1982 |
| 4328705 |
Method of determining characteristics of a fluid producing underground formation |
May. 11, 1982 |
| 4270385 |
Tool for testing earth formations in boreholes |
Jun. 2, 1981 |
| 4248081 |
Tool for testing earth formations in boreholes |
Feb. 3, 1981 |
| 4223725 |
Method for reservoir fluid drift rate determination |
Sep. 23, 1980 |
| 4159643 |
Method of and apparatus for measuring bottom hole well pressure |
Jul. 3, 1979 |
| 4142411 |
Water well draw down monitoring system |
Mar. 6, 1979 |
| 4123937 |
Methods of determining well characteristics |
Nov. 7, 1978 |
| RE29638 |
Pressure controlled test valve system for offshore wells |
May. 23, 1978 |
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