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| Number | Title | Issue Date |
| 8146416 | Methods and apparatus to perform stress testing of geological formations Example methods and apparatus to perform stress testing of geological formations are disclosed. A disclosed example downhole stress test tool for pressure testing a geological formation comprises first and second packers selectively inflatable to form an annular reg... | 04/03/2012 |
| 8136395 | Systems and methods for well data analysis Examples of techniques for analyzing well data which may be encountered during formation testing are disclosed. Certain portions of the tests may exhibit an indication of anomalous behavior, defects, errors or events that may have occurred during testing. One or mor... | 03/20/2012 |
| 8113044 | Downhole 4D pressure measurement apparatus and method for permeability characterization A system for making pressure measurements in a formation surrounding a wellbore includes a sensor which, in use, is positioned into direct pressure communication with the formation from a predetermined location in the wellbore, and a means for isolating the sensor, ... | 02/14/2012 |
| 8051706 | Wide liquid temperature range fluids for pressure balancing in logging tools An apparatus for performing a measurement in a borehole penetrating the earth, the apparatus including: a logging tool; an enclosed instrument cell disposed at the logging tool, the instrument cell being configured to perform the measurement; and a fill liquid dispo... | 11/08/2011 |
| 8028571 | Method and apparatus for pressure measurements in well testing Apparatus and method for determining pressure in a well is provided. A sensor for determining the rate of change of pressure in a well comprises: a first cavity body defining an enclosed volume, a portion of one wall of the cavity body being constituted by a pressur... | 10/04/2011 |
| 8015869 | Methods and apparatus to perform pressure testing of geological formations Example methods and apparatus to perform pressure testing of geological formations are disclosed. A disclosed example method comprises positioning a testing tool in a wellbore formed in the geological formation, sealing a sample interval around the testing tool, sea... | 09/13/2011 |
| 7841234 | System and method for sensing pressure using an inductive element Exemplary systems and method are directed to a sensing device, and to a pressure sensing system and method. An exemplary method includes supplying electromagnetic energy to a transducer which is configured to reflect the electromagnetic energy at a ring frequency de... | 11/30/2010 |
| 7765862 | Determination of formation pressure during a drilling operation A drilling operation wherein a borehole can be drilled through earth formations with a drill bit at the end of a drill string, using recirculating drilling mud that flows downward through the drill string, exits through the drill bit, and returns to the earth's surf... | 08/03/2010 |
| 7703318 | Permanently eccentered formation tester A formation tester for determining the formation pressure of a subsurface formation traversed by a wellbore comprises of:—an elongate tester body;—a support plate (3) that is extendible outwardly from the surface of the formation tester body, said support... | 04/27/2010 |
| 7694558 | Downhole washout detection system and method Disclosed herein is a method of detecting a downhole washout. The method includes, positioning a plurality of sensors along a downhole drillstring, communicatively coupling the plurality of sensors to a processor, and analyzing data sensed by the plurality of sensor... | 04/13/2010 |
| 7665356 | Pressure interference testing for estimating hydraulic isolation A cased hole pressure test tool is used to determine the integrity of cement between two points in a borehole in terms of permeability or transmissibility. The test tool drills at least one probe hole through the casing up to the cement. In one embodiment, two probe... | 02/23/2010 |
| 7360412 | Single point and fiber optic temperature measurement for correction of a gas column weight in a well Fluid column weight correction using discrete point and fiber optic temperature measurement. A method for determining pressure at a distal end of a fluid column in a well includes the steps of: dividing the fluid column into multiple segments; determining a temperat... | 04/22/2008 |
| 7353869 | System and method for utilizing a skin sensor in a downhole application A system and method is provided for sensing a variety of parameters in well-related environments. A skin sensor is deployed in downhole applications to obtain data used in analyzing well characteristics. ... | 04/08/2008 |
| 7350590 | Instrumentation for a downhole deployment valve The present generally relates to apparatus and methods for instrumentation associated with a downhole deployment valve or a separate instrumentation sub. In one aspect, a DDV in a casing string is closed in order to isolate an upper section of a wellbore from a lowe... | 04/01/2008 |
| 7331223 | Method and apparatus for fast pore pressure measurement during drilling operations A method and apparatus for measuring the pressure of a formation penetrated by a wellbore is provided. A downhole tool is positioned in the wellbore and a probe is extended therefrom into sealing engagement with the formation. A piston in the probe is retracted ther... | 02/19/2008 |
| 7328624 | Probe for measuring parameters of a flowing fluid and/or multiphase mixture A probe 10,170 is provided that measures the speed of sound and/or vortical disturbances propagating in a single phase fluid flow and/or multiphase mixture to determine parameters, such as mixture quality, particle size, vapor/mass ratio, liquid/vapor ratio, ... | 02/12/2008 |
| 7325597 | Safety valve apparatus for downhole pressure transmission systems Safety valve apparatus for a pressure telemetry system utilizing a small diameter tubing conveying pressure from a downhole pressure chamber to the surface, the system pressurized with a monitoring gas, is presented. A check valve assembly is placed along the fluid ... | 02/05/2008 |
| 7314082 | Methods of improving well bore pressure containment integrity Methods of improving the pressure containment integrity of subterranean well bores are provided. The methods include pumping a fracture sealing composition into the well bore that rapidly converts into a high friction pressure sealing composition which is impermeabl... | 01/01/2008 |
| 7311142 | Apparatus and method for aquiring information while drilling A downhole tool positionable in a wellbore for penetrating a subterranean formation includes a housing having at least one protuberance extending therefrom. The protuberance has at least one centralizing section and a protective section. A probe is positioned in the... | 12/25/2007 |
| 7311147 | Methods of improving well bore pressure containment integrity Methods of improving the pressure containment integrity of subterranean well bores are provided. The methods include pumping a fracture sealing composition into the well bore that rapidly converts into a high friction pressure sealing composition which is impermeabl... | 12/25/2007 |
| 7308936 | Methods of improving well bore pressure containment integrity Methods of improving the pressure containment integrity of subterranean well bores are provided. The methods include pumping a fracture sealing composition into the well bore that rapidly converts into a high friction pressure sealing composition which is impermeabl... | 12/18/2007 |
| 7303008 | Methods and systems for reverse-circulation cementing in subterranean formations Methods and systems for reverse-circulation cementing in subterranean formations are provided. An example of a method is a method of cementing casing in a subterranean well bore, comprising inserting a casing into the well bore, the casing comprising a casing shoe; ... | 12/04/2007 |
| 7296462 | Multi-purpose downhole tool A multi-purpose downhole tool comprising packers for isolating an interval of a downhole formation traversed by a borehole to form a packed-off interval annulus. The tool further comprises a reversible pump and more than one interval access port located between the ... | 11/20/2007 |
| 7287592 | Limited entry multiple fracture and frac-pack placement in liner completions using liner fracturing tool The present invention is directed to a method and apparatus for fracturing a subterranean formation which use a liner fracturing tool. The liner fracturing tool consists of a liner, with at least one jet extending through the liner. During fracturing operations, fra... | 10/30/2007 |
| 7277162 | Dynamic performance monitoring of long slender structures using optical fiber strain sensors A method is described using optical fiber technology to measure the vibration characteristics of long slender structures subjected to dynamic disturbances imposed by water or wind generated loads. The method is based on making bending strain measurements at selected... | 10/02/2007 |
| 7266983 | Methods to detect formation pressure A method of determining a formation pressure during drawdown of a formation comprises sampling fluid from a formation using a downhole tool. A fluid sample pressure is determined at two different times during the drawdown. The fluid sample pressures are analyzed usi... | 09/11/2007 |
| 7263880 | Method for measuring formation properties with a time-limited formation test An apparatus and method for determining at least one downhole formation property is disclosed. The apparatus includes a pretest piston positionable in fluid communication with the formation, and a series of flowlines pressure gauges, and valves configured to selecti... | 09/04/2007 |
| 7243537 | Methods for measuring a formation supercharge pressure A method of determining the supercharge pressure in a formation intersected by a borehole having a wall, the method comprising disposing a formation pressure test tool into the borehole having a probe for isolating a portion of the borehole. The method further compr... | 07/17/2007 |
| 7228899 | Warning device and method to prevent clutch burning This invention is generally directed towards a system designed to assist the rig operator by alerting him/her that the air pressure is too low to be using the drum clutch, to provide a log for studies on rig operation technique, and to provide a training tool for ri... | 06/12/2007 |
| 7216533 | Methods for using a formation tester A method of testing a downhole formation using a formation tester on a drill string. The formation tester is disposed downhole on a drill string and a formation test is performed by forming a seal between a formation probe assembly and the formation. A drawdown pist... | 05/15/2007 |
| 7210344 | Method for measuring formation properties with a time-limited formation test An apparatus and method for determining at least one downhole formation property is disclosed. The apparatus includes a probe and a pretest piston positionable in fluid communication with the formation, and a series of flowlines pressure gauges, and valves configure... | 05/01/2007 |
| 7201231 | Apparatuses and methods for deploying logging tools and signalling in boreholes The apparatus includes a pump for circulating pressurized fluid in a wellbore. A control device controls the pump which a conduit interconnects to the wellbore. A downhole transducer detects changes in fluid pressure at a downhole location and generates signals acco... | 04/10/2007 |
| 7201226 | Downhole measurement system and method A system and method measures a pressure or other measurement at a source (e.g. a hydraulic power supply) and in or near a downhole tool and compares the measurements to verify that, for example, the supply is reaching the tool. The system and method also may utilize... | 04/10/2007 |
| 7178391 | Insertion tube methods and apparatus A drill string comprises a first drill string member having a male end; and a second drill string member having a female end configured to be joined to the male end of the first drill string member, the male end having a threaded portion including generally square t... | 02/20/2007 |
| 7178392 | Determining the pressure of formation fluid in earth formations surrounding a borehole A method for determining formation fluid pressure in earth formation surrounding a borehole wall uses a downhole probe coupled to a variable-volume cavity. The probe is driven into contact with formation at the borehole wall. The method includes expanding the volume... | 02/20/2007 |
| 7162918 | Method and apparatus for downhole fluid characterization using flexural mechanical resonators The present invention provides a downhole method and apparatus using a flexural mechanical resonator, for example, a tuning fork to provide real-time direct measurements and estimates of the viscosity, density and dielectric constant of formation fluid or filtrate i... | 01/16/2007 |
| 7159660 | Hydrajet perforation and fracturing tool Methods and apparatus for fracturing a subterranean formation which use a fracturing tool. The fracturing tool includes a hydrajet tool, with at least one fluid jet and at least one fracturing port extending through the liner. The fracturing tool further includes a ... | 01/09/2007 |
| 7152466 | Methods and apparatus for rapidly measuring pressure in earth formations Methods and apparatus for rapidly measuring pressure in earth formations are disclosed. According to a first embodiment of the apparatus, a probe is provided with a movable piston having a sensor built into the piston. According to a second embodiment of the apparat... | 12/26/2006 |
| 7150188 | Non-invasive measurement of fluid-pressure diffusivity using electro-osmosis An apparatus for determining fluid-pressure diffusivity in a borehole (12) in a formation (10) includes an electrode (16) and a strain measuring device (18),(20) (or a particle velocity measuring device (18),(20) or a... | 12/19/2006 |
| 7073591 | Casing hanger annulus monitoring system A subsea wellhead assembly has the capabilities of communicating from a tree assembly mounted on an inner wellhead housing to a casing annulus. A passage in the wellhead assembly extends within the bore of the wellhead housing from the casing annulus to the tree ass... | 07/11/2006 |
