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| Number | Title | Issue Date |
| 8141419 | In-situ formation strength testing Estimating formation properties includes a member coupled to a carrier, the member having a distal end that engages a borehole wall location, the distal end having a curved surface having a radius of curvature in at least one dimension about equal to or greater than... | 03/27/2012 |
| 7775100 | Real-time management system for slickline/wireline A real-time line management system and associated methods. A line management system for use in conjunction with an operation in a subterranean well includes a line installed in the well during the operation, and a computing device which indicates a used life of the ... | 08/17/2010 |
| 7624630 | Testing method and apparatus ground liquefaction and dynamic characteristics in original position utilizing boring hole A testing method and apparatus for ground liquefaction and dynamic characteristics in the original position utilizing a boring hole, wherein the dynamic strength and deformation characteristics of a soil layer against a dynamic repetitive load, in an optional positi... | 12/01/2009 |
| 7444861 | Real time management system for slickline/wireline A real-time line management system and associated methods. A line management system for use in conjunction with an operation in a subterranean well includes a line installed in the well during the operation, and a computing device which indicates a used life of the ... | 11/04/2008 |
| 7377319 | Downhole device to measure and record setting motion of packers and method of sealing a wellbore A downhole tool assembly including a sealing device and a sensing device for sensing parameters associated with the operation of the sealing device. ... | 05/27/2008 |
| 7278318 | Differential pressure sensor comprising a symmetric error in the separating bodies A pressure-difference sensor, which is asymmetrical by design, includes a measuring apparatus having a first half-chamber with a first volume V1, which is sealed by a first separating membrane having a first membrane stiffness E1, and a second ... | 10/09/2007 |
| 7249525 | Apparatus for measuring parameters of a fluid in a lined pipe An apparatus for measuring a parameter of a fluid passing through a pipe comprises a spatial array of pressure sensors disposed at different axial locations along the pipe between a sleeve within the pipe and an inside surface of the pipe. Each of the pressure senso... | 07/31/2007 |
| 7249632 | Top drive swivel apparatus and method For use with a top drive power unit supported for connection with a well string in a well bore to selectively impart longitudinal and/or rotational movement to the well string, a feeder for supplying a pumpable substance such as cement and the like from an external ... | 07/31/2007 |
| 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 |
| 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 |
| 7200539 | Method of predicting the on-set of formation solid production in high-rate perforated and open hole gas wells A method for predicting the on-set of sand production or critical drawdown pressure (CDP) in high flow rate gas wells. The method describes the perforation and open-hole cavity stability incorporating both rock and fluid mechanics fundamentals. The pore pressure gra... | 04/03/2007 |
| 7171851 | Temperature compensated strain measurement The present invention provides methods and apparatus for measuring subterranean strain. The methods and apparatus use fluid expansion principles to compensate for temperature variations and increase the accuracy of the strain measurements. The methods and apparatus ... | 02/06/2007 |
| 7066019 | Cavity stability prediction method for wellbores A method of predicting the failure of a rock formation surrounding a subterranean cavity, including a measuring set of parameters relating to pressure conditions and stresses in the rock formation surrounding the cavity; using the set of parameters to determine a ro... | 06/27/2006 |
| 7054752 | Method for optimizing production of an oil reservoir in the presence of uncertainties A method for optimizing the production of oil reservoirs, and notably the production schemes, while taking into account uncertainties inherent in any reservoir survey. The method sequentially has the following stages: Stage 1: A se... | 05/30/2006 |
| 7031840 | Drilling performance assessment process A method to create a drilling performance assessment ratio. The ratio includes the steps of establishing a technical minimum time limit standard for each of multiple sequential steps required for a drilling operation. Actual time performance for each of the multiple... | 04/18/2006 |
| 7028772 | Treatment well tiltmeter system The treatment well tiltmeter system comprises one or more tiltmeter assemblies which are located within an active treatment well. The treatment well tiltmeter system provides data from the downhole tiltmeters, and can be used to map hydraulic fracture growth or othe... | 04/18/2006 |
| 7011155 | Formation testing apparatus and method for optimizing draw down A method and apparatus for of determining a formation parameter of interest. The method includes placing a tool into communication with the formation to test the formation, determining a first formation characteristic during a first test portion, initiating a second... | 03/14/2006 |
| 7007753 | Top drive swivel apparatus and method For use with a top drive power unit supported for connection with a well string in a well bore to selectively impart longitudinal and/or rotational movement to the well string, a feeder for supplying a pumpable substance such as cement and the like from an external ... | 03/07/2006 |
| 6962088 | Torque detection device for wave gearing The torque detection device for a wave gearing comprises a strain gauge unit having a strain gauge pattern. The strain gauge pattern includes circular-arc shaped detection segments A and B, and three terminal portions for external wiring with one being formed betwee... | 11/08/2005 |
| 6957580 | System and method for measurements of depth and velocity of instrumentation within a wellbore A survey tool for use in a wellbore includes a downhole portion having an axis. The downhole portion is adapted to move within the wellbore with the axis generally parallel to the wellbore. The survey tool further includes a first acceleration sensor mounted at a fi... | 10/25/2005 |
| 6957576 | Subterranean well pressure and temperature measurement A well pressure and temperature measurement system and method are provided. In a described embodiment, a sensor system includes multiple strain sensors attached to a structure which changes dimensionally in response to well pressure and temperature changes. The stra... | 10/25/2005 |
| 6957575 | Apparatus for weight on bit measurements, and methods of using same The present invention is generally directed to a tool for obtaining downhole measurements and methods of using such a tool. In one illustrative embodiment the tool comprises a body, at least one strain gauge cavity in the body, the strain gauge cavity having a strai... | 10/25/2005 |
| 6924745 | System and method for monitoring packer slippage A system and method for monitoring a device in a well, according to which a sensor associated with the device monitors any movement of the device in the well and outputs a corresponding signal. The signal is processed and transmitted to a remote location. ... | 08/02/2005 |
| 6802215 | Apparatus for weight on bit measurements, and methods of using same The present invention is generally directed to a tool for obtaining weight-on-bit (WOB) measurements and methods of using such a tool. In one illustrative embodiment the tool comprises a body, at least one strain gauge cavity in the body, the strain gauge cavity hav... | 10/12/2004 |
| 6776035 | Method and device for calibration of dual-axis tilt meter The invention is directed toward a subsurface gravity measurement device and a method for calibrating the same that includes a tilt meter and a gravity sensor. The method includes associating tilt information produced by the gravity sensor as a function of a relatio... | 08/17/2004 |
| 6655220 | Method and device for in situ triaxial test The device comprises a corer (1, 4) fitted with a flexible diaphragm (2) on its inside face, means (10) for driving the corer into the soil (11), means for breaking up the soil leaving the top orifice of the corer, means for applying axial forces on the d... | 12/02/2003 |
| 6553825 | Torque swivel and method of using same A torque swivel apparatus. The apparatus includes an upper body assembly secured to the lower end of a locking swivel of the type used in wireline operations. The upper body would engage into a lower body, the lower body secured to the drill string at the... | 04/29/2003 |
| 6536519 | Downhole tool to generate tension pulses on a slickline A downhole tool that is connectable to a line to be run downhole with the tool includes a housing, a sensor and a mechanism that is located inside the housing. The mechanism is coupled to the sensor to, in response to the detection of the feature by the s... | 03/25/2003 |
| 6526819 | Method for analyzing a completion system The present invention provides a method for analysing a well completion system, wherein the method includes receiving data representative of physical characteristics of the completion system and calculating a first change in length of a tube string result... | 03/04/2003 |
| 6354158 | System for measuring torque applied to the drum shaft of a hoist The invention provides a method and apparatus for measuring the torque applied to the drum shaft of a hoist. By measuring the torque on the drum shaft, the force or tension on the fast line can be accurately determined. If the force or tension on the dead... | 03/12/2002 |
| 6276466 | System for measuring the direction and revolution of a production string A sensing system mounted to a mechanical drill pipe swivel of the type which is mounted on a rig housing to a section of drill pipe. The swivel would include an enlarged body portion for securing to a section of drill pipe. There would be provided a first... | 08/21/2001 |
| 6260618 | Method for locating placement of a guide stock in a multilateral well A method for locating placement of a guide stock in a multilateral well wherein the guide stock is properly aligned with the lateral borehole. The method employs an impression packer with a scribed reference line to provide information at the surface rega... | 07/17/2001 |
| 6178815 | Method to improve the quality of a formation fluid sample The present invention provides a method for improving the quality of a formation fluid sample by taking the sample at a time when the formation fluid composition contains the most favorable portion of hydrocarbons. This task is accomplished by determining... | 01/30/2001 |
| 6151960 | Method of determining characteristics of a rotary drag-type drill bit A method of determining wear characteristics of a rotary drag-type drill bit comprises the steps of: determining the location and shape of a datum profile for the cutters on the bit body: determining the location and shape of a reference profile located i... | 11/28/2000 |
| 6138752 | Method and apparatus to determine subterrranean formation stress The invention is a method to determine stress within a formation, the method comprising the steps of: providing a closed reference pressure volume within the formation; providing a flexible diaphragm which can be exposed on one side to formation, and on t... | 10/31/2000 |
| 6102122 | Control of heat injection based on temperature and in-situ stress measurement The invention is a method to operate a heat injection well, the method comprising the steps of: providing a heat injection well comprising a metal casing and a controllable source of heat within the casing; determining the maximum temperature of the casin... | 08/15/2000 |
| 5934373 | Apparatus and method for monitoring underground fracturing An apparatus and method for measuring deformation of a rock mass around the vicinity of a fracture, commonly induced by hydraulic fracturing is provided. To this end, a well is drilled offset from the proposed fracture region, if no existing well is prese... | 08/10/1999 |
| 5929341 | Stress measuring rock support device A stress measuring rock support device is provided, such as a cable bolt or friction stabilizer, which has an internal longitudinal cavity, such as a groove or a flat section on the kingwire or a hollow core in the kingwire or the like. One or more rigid ... | 07/27/1999 |
| 5874676 | Method and apparatus for acoustically investigating a casing with a swept frequency pulse An apparatus and method for using swept frequency energy to inspect a casing or other body is disclosed. A transducer (75) transmits a swept frequency pulse at a casing and receives the reflection resulting from the pulse's impact against the casing. The ... | 02/23/1999 |
