| Patent Number |
Title Of Patent |
Date Issued |
| 7224162 |
System and methods for upscaling petrophysical data |
May 29, 2007 |
| System and methods for estimating properties of a geologic formation are disclosed. A preferred embodiment includes a method for estimating properties of a geologic formation, comprising the steps of: measuring a property of the formation in two or more directions along a path in the |
| 7082078 |
Magnetorheological fluid controlled mud pulser |
July 25, 2006 |
| A mud pulser controlled by a field applied to an electroactive fluid. The electroactive fluid is employed to act as a rapid-response brake to slow or interrupt the rotation of a mud motor or mud siren, thus creating pressure pulses in a circulating fluid. In certain embodiments, the |
| 7059179 |
Multi-probe pressure transient analysis for determination of horizontal permeability, anisotropy |
June 13, 2006 |
| The specification discloses a downhole tool that determines hydraulic permeability of a downhole formation taking into account one or both of the dip angle of the borehole relative to the formation, and damage to the borehole wall and invasion of borehole fluid--collectively referred |
| 6327538 |
Method and apparatus for evaluating stoneley waves, and for determining formation parameters in |
December 4, 2001 |
| A subsurface formation may be evaluated through use of data obtained from Stoneley wave propagation in the fluid column within the borehole. Either wave amplitude or phase velocity may be utilized to determine composite lithology parameters. These composite lithology parameters reflect f |
| 5969638 |
Multiple transducer MWD surface signal processing |
October 19, 1999 |
| A system and method for signal processing are disclosed. One problem in measurement-while-drilling systems including a downhole acoustic transmitter is the presence of uphole generated noise and reflected signals. By proper spacing and timing of multiple transducers and measurements, |
| 5831177 |
Fluid driven siren flowmeter |
November 3, 1998 |
| A system for determining fluid flow characteristics and relaying the information to the surface. The system is ideal for use in horizontal or deviated wellbores since orientation of the wellbore with respect to the vertical will not appreciably affect the system's operation. In the d |
| 5740126 |
Turbo siren signal generator for measurement while drilling systems |
April 14, 1998 |
| A self-propelled turbo siren modulator assembly is disclosed for use in an MWD system. The turbo siren includes a fixed turbine deflector located upstream from a rotor, which in turn is located upstream from a fixed stator. Drilling mud flowing through the turbine deflector causes the |
| 5703286 |
Method of formation testing |
December 30, 1997 |
| A new technique for interpreting pressure data measured during a formation test. The new technique uses an exact spherical flow model that considers the effects of flow line storage and that can be solved in closed, analytical form. This technique generates a type-curve that matches the |
| 5672819 |
Formation evaluation using phase shift periodic pressure pulse testing |
September 30, 1997 |
| The present invention provides an apparatus and method for determining geologic formation properties. A pressure wave is generated by a reciprocating piston transmitted to the formation by a probe. The pressure is sensed by a high accuracy quartz gauge in the probe. This pressure is |
| 5644076 |
Wireline formation tester supercharge correction method |
July 1, 1997 |
| An improved formation testing method increases the accuracy of in-situ formation pressure measurements by characterizing the mudcake properties. Specifically, after a formation tester is lowered to a desired depth within a wellbore, a pad is extended to gently abut and seal against the |
| 5586083 |
Turbo siren signal generator for measurement while drilling systems |
December 17, 1996 |
| A self-propelled turbo siren modulator assembly is disclosed for use in an MWD system. The turbo siren includes a fixed turbine deflector located upstream from a rotor, which in turn is located upstream from a fixed stator. Drilling mud flowing through the turbine deflector causes the |
| 5583827 |
Measurement-while-drilling system and method |
December 10, 1996 |
| In a Measurement-While-Drilling system, selecting the fixed frequency in a pulse signal generator utilizes constructive interference to enhance the signal level in an amplitude modulated signal. The pulse generation system preferably includes a plurality of mud sirens in tandem to furthe |
| 5535177 |
MWD surface signal detector having enhanced acoustic detection means |
July 9, 1996 |
| The acoustic detector in a mud pulse telemetry system includes a one dimensional waveguide disposed between a pressure transducer and a conduit carrying drilling fluid to a drill string. The waveguide, which may include a flexible hydraulic hose, increases the amplitude of the acoustic |
| 5515336 |
MWD surface signal detector having bypass loop acoustic detection means |
May 7, 1996 |
| An acoustic detector in a mud pulse telemetry system includes a bypass loop in parallel with a section of the main mud line that supplies drilling mud to a drill string. The detector includes a pair of pressure sensing ports in the bypass line, and one or more pressure transducers for de |
| 5459697 |
MWD surface signal detector having enhanced acoustic detection means |
October 17, 1995 |
| The acoustic detector in a mud pulse telemetry system includes a one dimensional waveguide disposed between a pressure transducer and a conduit carrying drilling fluid to a drill string. The waveguide, which may include a flexible hydraulic hose, increases the amplitude of the acoustic |
| 4785300 |
Pressure pulse generator |
November 15, 1988 |
| An improved acoustic signal generator has rotor and stator elements, each having a plurality of radially-extending lobes and intervening ports relatively positioned and configured to establish fluid dynamic forces that bias the generator into an open position, thereby imparting a "stable |
