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| Number | Title | Issue Date |
| 7565834 | Methods and systems for investigating downhole conditions Methods and systems for investigating downhole conditions are described. One method comprises inserting a tubular into a wellbore, the tubular comprising a tubular section having upper and lower fluid injection ports, and having a thermally insulated fiber optic cab... | 07/28/2009 |
| 7398680 | Tracking fluid displacement along a wellbore using real time temperature measurements Tracking fluid displacement along a wellbore using real time temperature measurements. A method of tracking fluid displacement along a wellbore includes the steps of: monitoring temperature in real time in the wellbore; and observing in real time a variation in temp... | 07/15/2008 |
| 7234521 | Method and apparatus for pumping quality control through formation rate analysis techniques The present invention provides a method and apparatus for determination of the quality of a formation fluid sample including monitoring permeability and mobililty versus time to determine a filtrate contamination level, single phase state without gas and solids in t... | 06/26/2007 |
| 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 |
| 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 |
| 7152679 | Downhole tool for deforming an object A downhole tool comprises a body defining a fluid chamber, a fluid outlet for directing fluid outwardly of the chamber, and an arrangement for producing a rapid reduction in the volume of the chamber, such that fluid in the chamber is displaced rapidly through the o... | 12/26/2006 |
| 7086484 | Determination of thermal properties of a formation The present invention relates to methods and apparatus for making in situ thermal property determinations utilizing a heat source employed in wellbore stabilization procedures, well drilling, or well perforating, for example. In particular, using a heat source, such... | 08/08/2006 |
| 7077205 | Method and device to free stuck objects A method of freeing stuck objects (16) from a bore (14) comprises running a string (12) into the bore (14), the string (12) including a flow modifier, such as a valve, for producing variations in the flow of fluid through the strin... | 07/18/2006 |
| 7055604 | Use of distributed temperature sensors during wellbore treatments The invention relates to a method for treating subterranean formation comprising providing distributed temperature sensors, injecting a treatment fluid and monitoring the temperature across the treatment interval during the injection process. ... | 06/06/2006 |
| 6999892 | Circuit arrangement and method for controlling and evaluating signal detectors A circuit arrangement (10) for activating a sensor and evaluating its signals, in particular for parametric sensors with complex impedances. The circuit arrangement comprises at least one sensor (2) for acquiring mechanical data. In order to minimize o... | 02/14/2006 |
| 6950750 | Method of estimating the gas/oil ratio (GOR) in the fluids of a well during drilling A method of evaluating the volume ratio of gas to oil (GOR) in the fluids of a well during drilling by direct or indirect measurement of the volumes of gas and oil in the cuttings. The method includes determining the volume of gas (Vg) contained in the drilling flui... | 09/27/2005 |
| 6905241 | Determination of virgin formation temperature A method for determining virgin formation temperature of earth formations surrounding a borehole is provided. The time duration of drilling fluid circulation and the time after cessation of drilling fluid circulation at the borehole depth regions of interest are tra... | 06/14/2005 |
| 6618677 | Method and apparatus for determining flow rates A fiber optic sensor system provides sufficient thermal information to determine the mass flow rates of produced fluids within a well bore, using an optical fiber placed within or adjacent to the well bore without interference with production or prejudici... | 09/09/2003 |
| 6227045 | Groundwater flow measuring system A probe for monitoring groundwater flow seepage velocity and direction has an electrical heater and a plurality of temperature sensors located equidistant from the heater. The probe with the heater and temperature sensors is lowered into a monitoring well... | 05/08/2001 |
| 5964530 | Method for compensating earth surface temperatures for the skyward effect thereon A method for compensating measured earth surface temperatures for the effects which skyward temperatures have upon such measured temperatures. Also, methods for employing compensated earth surface temperatures to determine the likelihood of subsurface fea... | 10/12/1999 |
| 5743642 | Method for compensating earth surface temperatures for the skyward effect thereon A method for compensating measured earth surface temperatures for the effects which skyward temperatures have upon such measured temperatures. Also, methods for employing compensated earth surface temperatures to determine the likelihood of subsurface fea... | 04/28/1998 |
| 5731517 | Measuring device used in a four-parameter measuring system and in a high temperature and high pressure condition A measuring device used in a four parameter measuring system for measuring simultaneously temperature, pressure, flow rate and steam quality of steam injection profiles during heavy oil recovery by steam injection, comprising: a cable cap, arranged at the... | 03/24/1998 |
| 5551287 | Method of monitoring fluids entering a wellbore In a borehole logging tool, a hot wire or hot film anemometer measures fluid flow entering or exiting the borehole at the wall of the borehole. The logging tool has open sensing pads mounted on the arms to place the sensor pads at the wall. The sensor pad... | 09/03/1996 |
| 5509474 | Temperature logging for flow outside casing of wells Apparatus and method for detecting varying flow velocity at differing points outside the casing in a wellbore are provided. The flow is detected by stationary temperature sensors inside the casing. Logging means, sensors left in the well with data storage... | 04/23/1996 |
| 5473939 | Method and apparatus for pressure, volume, and temperature measurement and characterization of subsurface formations A method and apparatus for conducting in situ tests on a subsurface earth formation of interest which is traversed by a wellbore. A wireline formation testing instrument is positioned at formation depth and a sampling probe thereof is extended into fluid ... | 12/12/1995 |
| 5415037 | Method and apparatus for monitoring downhole temperatures A method and apparatus for determining the temperature in a wellbore is disclosed. The apparatus is lowered into a wellbore to a desired depth and logged over a selected interval. At least one first heat flux and temperature sensor contacts the wellbore w... | 05/16/1995 |
| 5375465 | Method for gas/liquid well profiling A method for profiling of a gas and liquid producing wells comprising compiling calibration data from measuring instruments within non-in situ test equipment, valuing downhole gas and liquid density, determining average values for downhole instrument meas... | 12/27/1994 |
| 5348093 | Cementing systems for oil wells A process for determining suitable parameters of temperature and/or pressure to use in a cementing operation in a wellbore to obtain a positive seal of cement in an annulus between a liner and a borehole wall after the cement has set up and where the proc... | 09/20/1994 |
| 5329811 | Downhole fluid property measurement tool Apparatus and methods are provided for measuring a parameter of a hydrocarbon-bearing well fluid sample while the sample is still in place in the well and at downhole pressure and temperature conditions. A tool is lowered into the well to a downhole locat... | 07/19/1994 |
| 5319965 | Multiple channel pressure recorder A self-contained multiple channel pressure recorder comprises a single, compact, portable housing containing two quartz pressure transducers and electrical circuits for sensing two pressures communicated into the housing to the pressure transducers, for s... | 06/14/1994 |
| 5302781 | Sidewall contact temperature tool including knife edge sensors for cutting through mudcake and measuring formation temperature A sidewall contact parameter tool, adapted to be disposed in a mud-filled wellbore, includes a pad assembly, in accordance with the present invention, which is adapted to cut through mudcake and measure a parameter of a formation disposed under the mudcak... | 04/12/1994 |
| 5136525 | Method and apparatus for carrying out borehole temperature measurements A self-contained, programmable temperature sensor is positioned within a suitable pressure housing affixed to a borehole tool to record and store temperature data at predetermined times during operations of the borehole tool in a borehole penetrating a su... | 08/04/1992 |
| 5121993 | Triaxial thermopile array geo-heat-flow sensor A triaxial thermopile array geothermal heat flow sensor is designed to measure heat flow in three dimensions in a reconstituted or unperturbed subsurface regime. Heat flow can be measured in conductive or permeable convective media. The sensor may be enca... | 06/16/1992 |
| 4947682 | Method of locating oil and gas horizons using a wellbore heat flow log Oil and gas horizons in a wellbore are located by establishing from thermal logs thermal gradients for successive intervals free of drilling-induced thermal disturbances, identifying the mineral abundances surrounding the wellbore at each of said interval... | 08/14/1990 |
| 4881406 | Apparatus and method for taking measurements while drilling A first temperature sensor is carried by the drill pipe on a radially extensible arm for positioning the sensor at or near the face of the well bore for measuring the true temperature of the face. A second temperature sensor at an intermediate position on... | 11/21/1989 |
| 4866607 | Self-contained downhole gauge system In an oil well instrumentation system, the downhole sensor system is controlled by a computer which is powered-on only during sampling movement. An independent circuit, continuously powered, detects significant sensor rate-of-change values whereby the com... | 09/12/1989 |
| 4832121 | Methods for monitoring temperature-vs-depth characteristics in a borehole during and after hydraulic fracture treatments A method for monitoring in real time the growth of an hydraulic fracture in an earth formation traversed by a well borehole. Growth of the fracture is observed by measuring the temperature of the borehole fluid at selected times during the fracturing proc... | 05/23/1989 |
| 4765183 | Apparatus and method for taking measurements while drilling A first temperature sensor is carried by the drill pipe on a radially extensible arm for positioning the sensor at or near the face of the well bore for measuring the true temperature of the face. A second temperature sensor at an intermediate position on... | 08/23/1988 |
| 4740897 | Memory operated well tools A self-contained, down hole powered electrical system in which the tool has nonvolatile memory means which are independent of applied power thereby permitting the power to the system to be turned off between sampling and further including a system for ree... | 04/26/1988 |
| 4676664 | Exploring for subsurface hydrocarbons by sea floor temperature gradients preferably using a multiplexed thermistor probe Disclosed are a method and a system for measuring the sea floor temperature gradient several meters into the formation at each of an array of measurement sites, and using these gradients to explore for and characterize hydrocarbon deposits. The measuremen... | 06/30/1987 |
| 4575261 | System for calculating formation temperatures Determination of drilling mud thermal conductivity for estimation of earth formation temperature through a well bore thermal model. Borehole annulus and drill pipe bore temperature measurements are taken over a relatively short period of time when circula... | 03/11/1986 |
| 4561300 | Temperature logging while drilling A temperature recorder suitable for circulation with a well drilling fluid is provided with a spherical casing and/or a plurality of minute samples of known melting point and/or positioning of the samples in the mouth of a capillary structure so that the ... | 12/31/1985 |
| 4476716 | Methods for locating oil or gas deposits employing temperature and/or geothermal gradient measurements A method for predicting the likelihood of encountering oil or gas deposits below a location. A temperature at a known depth at the location is compared to a temperature representative of the average temperature for that depth within the geographical area ... | 10/16/1984 |
| 4381667 | Measurement of borehole temperature A borehole survey tool of the type having a chamber for receiving a borehole survey instrument, and a shock absorbing assembly for supporting the survey instrument in the chamber, said shock absorbing assembly including a substantially helical return spri... | 05/03/1983 |
| 4375164 | Formation tester A well tool for developing measurements of pressure or temperature in a well bore comprising an elongated well tool which utilizes a coherent beam of light which is applied to the ends of separate fiber optics and the other ends of the fiber optics are de... | 03/01/1983 |
