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| Number | Title | Issue Date |
| 7975541 | Folding ultrasonic borehole imaging tool A borehole logging tool includes a housing oriented along a longitudinal axis, and a centralizer assembly that positions the housing substantially at the center of the borehole. In one example, the centralizer assembly includes a plurality of centralizer arms radial... | 07/12/2011 |
| 7921714 | Annular region evaluation in sequestration wells Methods and related systems are described for making measurements at multiple locations in an annular region of a cased sequestration well. A first tool module is positionable within the well and adapted to directly or indirectly measure changing pressure at a first... | 04/12/2011 |
| 7784339 | Perforation logging tool and method The present invention provides an apparatus an methods for detecting the behavior of perforations in a wellbore casing, the apparatus including a sensor array movable within the internal diameter of the casing, the sensor array having one or more sensors located pro... | 08/31/2010 |
| 7698937 | Method and apparatus for detecting defects in oilfield tubulars A sensor system for detecting defects in a tubular string while positioned in the well includes a sensor tool (10) comprising a plurality of circumferentially spaced sensors (40) arranged in two or more axially spaced rows. A plurality of sensors are p... | 04/20/2010 |
| 7634942 | Tubing expansion A method of expanding a tubular downhole comprises mounting a sensing device in a downhole tubular to be expanded, expanding at least a portion of the tubular and then engaging the sensing device with a retrieving device. The sensing device is then translated throug... | 12/22/2009 |
| 7552631 | Internal riser inspection device and methods of using same An inspection apparatus includes an inspection unit that is lowered into vertically supported pipe filled with seawater. The apparatus includes a pipe weld location detector module carried by the inspection unit. The apparatus also includes a rotating time of flight... | 06/30/2009 |
| 7500389 | Tubing expansion A method of expanding a tubular downhole comprises mounting a sensing device in a downhole tubular to be expanded, expanding at least a portion of the tubular and then engaging the sensing device with a retrieving device. The sensing device is then translated throug... | 03/10/2009 |
| 7401646 | Methods 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; ... | 07/22/2008 |
| 7389815 | Methods 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; ... | 06/24/2008 |
| 7273097 | Formation characterization using wellbore logging data Methods for determining formation characteristics comprising establishing baseline casing conditions for a string of casing disposed within a wellbore in a formation and measuring updated casing conditions for the string of casing at a first time interval from the e... | 09/25/2007 |
| 7249633 | Release tool for coiled tubing A bottom hole assembly for use with fracturing or fracing a wellbore using coiled tubing is described having a first packing element and a second packing element on a mandrel. The bottom hole assembly may be run into the wellbore such that the packing elements strad... | 07/31/2007 |
| 7243727 | Isolation assembly for coiled tubing An isolation assembly for use with coiled tubing is described. The isolation assembly has a check valve for providing selective fluid communication through from the coiled tubing, through the isolation assembly, and into a downhole tool, such a straddle packer. The ... | 07/17/2007 |
| 7234347 | Internal riser inspection device and methods of using same An inspection apparatus includes an inspection unit that is lowered into vertically supported pipe filled with seawater. The apparatus includes a pipe weld location detector module carried by the inspection unit. The apparatus also includes a rotating time of flight... | 06/26/2007 |
| 7152680 | Slickline power control interface An apparatus, method, and system for use in operating an electric downhole tool on a non-conductive support line (slickline) by converting a battery voltage to an output voltage suitable for operating the tool. In response to receiving a trigger signal, the output v... | 12/26/2006 |
| 7134488 | Isolation assembly for coiled tubing An isolation assembly for use with coiled tubing is described. The isolation assembly has a check valve for providing selective fluid communication through from the coiled tubing, through the isolation assembly, and into a downhole tool, such a straddle packer. The ... | 11/14/2006 |
| 7104125 | Internal riser inspection device and methods of using same An inspection apparatus includes an inspection unit that is lowered into vertically supported pipe filled with seawater. The apparatus includes a pipe weld location detector module carried by the inspection unit. The apparatus also includes a rotating time of flight... | 09/12/2006 |
| 7082822 | Internal riser inspection device and methods of using same An inspection apparatus includes an inspection unit that is lowered into vertically supported pipe filled with seawater. The apparatus includes a pipe weld location detector module carried by the inspection unit. The apparatus also includes a rotating time of flight... | 08/01/2006 |
| 7040402 | Instrumented packer A technique that is usable with a subterranean well includes communicating a fluid into a region of the well and monitoring a level of the fluid communicated via a downhole sensor. The communication is controlled in response to the monitoring. ... | 05/09/2006 |
| 6513591 | Leak detection method A method for detecting a leak in a well tubular of a well for production of hydrocarbon fluid from a formation is disclosed. The method includes steps of: passing a sonic tool provided with a transducer package capable of sending and receiving a sonic sig... | 02/04/2003 |
| 6453738 | Method and apparatus for analyzing casing wear and retrieval of metallic fragments A method and apparatus for retrieving magnetic casing fragments from a well using a shrouded magnet are disclosed. Retrieving casing fragments allows the determination of weight loss from the casing to assist in analyzing the integrity and the condition o... | 09/24/2002 |
| 6401814 | Method of locating a cementing plug in a subterranean wall A method is provided which, in an embodiment described herein, permits a location and/or displacement of a cementing plug to be determined during a cementing operation. In this embodiment, one or more pressure pulses are transmitted through displacement f... | 06/11/2002 |
| 6374669 | Water influx identification An improved method to detect water influx using video monitoring of a cased wellbore is disclosed. A wireline well tool having a video camera and a light source is lowered into a selected borehole interval where water influx is suspected. The borehole flu... | 04/23/2002 |
| 6305467 | Wireless coiled tubing joint locator A wireless coiled tubing joint locator for locating joints or collars in a production tubing string. An electromagnetic coil assembly or giant magnetoresistive digital field sensor senses the increased mass of a pipe joint, and provides a signal to an ele... | 10/23/2001 |
| 6296057 | Method of maintaining the integrity of a seal-forming sheath, in particular a well cementing sheath A method of maintaining the integrity of a sheath, in particular a cementing sheath in a well consists in calculating or estimating variations in well pressure and/or in well temperature and/or in the variations in in-situ stresses, which may occur during... | 10/02/2001 |
| 6279392 | Method and system for distributed well monitoring A distributed pressure monitoring system is disclosed for monitoring formation pressure along substantial lengths of a casing in a borehole. The monitoring system has a communications line connected to surface facilities on one end which leads down the ca... | 08/28/2001 |
| 6131659 | Downhole well corrosion monitoring apparatus and method The existence and rate of corrosion in a section of a well tubing or well casing string is determined and monitored continuously or intermittently by installing at predetermined locations as the string is placed in the well bore, sections of pipe that hav... | 10/17/2000 |
| 6053245 | Method for monitoring the setting of well cement An improved method of monitoring the setting of a settable liquid-containing material is provided. The compressibility of one or more fluids including the settable material is monitored at periodic intervals during the setting process. As the material set... | 04/25/2000 |
| 5883583 | Imaging a completion string in a wellbore A system for creating an image of a combination of a completion string in a wellbore. An image of the wellbore is received and created. In addition, modeled data of the completion string is also created and received. The wellbore image data is combined wi... | 03/16/1999 |
| 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 |
| 5626192 | Coiled tubing joint locator and methods A well pipe string joint locator for attachment to the end of a length of coiled tubing and moved within the pipe string as the coiled tubing is lowered or raised therein is provided as well as methods of using the joint locator. The joint locator is comp... | 05/06/1997 |
| 5361838 | Slick line casing and tubing joint locator apparatus and associated methods An electromechanical detector structure is used to sense and log the joints in a downhole jointed tubular structure, such as a well bore casing or production tubing, in a subterranean well. The detector is lowered into the tubular structure on an elongate... | 11/08/1994 |
| 5360738 | Method of quantitative analysis of drilling fluid products A method of quantitative analysis of products, such as barite, bentonite or polymers, in a drilling fluid circulating in a wellbore being drilled is described. The method includes the steps of sampling the drilling fluid, and analysing the sample to deter... | 11/01/1994 |
| 5267469 | Method and apparatus for testing the physical integrity of production tubing and production casing in gas-lift wells systems A method for testing physical integrity of production tubing and production casing in a gas-lift well includes the steps of opening communication from a pressure source to an interior space of the production tubing; disposing a sealing tool in the product... | 12/07/1993 |
| 4928520 | Plug release indicator A plug release indicator is provided which includes an elastomeric probe, with a wire embedded therein, which extends into the interior area of a plug housing or well casing. The wire has a lip at one end and an anchor at the other end, such that when a c... | 05/29/1990 |
| 4912683 | Method for acoustically measuring wall thickness of tubular goods A method for acoustically measuring wall thickness of tubular goods utilizes an acoustical transducer with a large bandwidth and high resonant frequency to measure the thickness of thin walls. The transducer is exposed directly to fluids in the tubular go... | 03/27/1990 |
| 4861986 | Tracer injection method A tracer injection method is set forth and is practiced by using spaced end located injectors on a sonde having spaced detectors along the length of the sonde. The injectors inject radioactive isotopes which are distinguishable from one another at the det... | 08/29/1989 |
| 4794336 | Apparatus for surveying a borehole comprising a magnetic measurement probe to be moved within a drill pipe to a measurment position within a non-magnetic collar A single-shot or multi-shot measurement probe incorporates a magnetic field sensor for sensing the earth's magnetic field, a processing unit for determining from the output of the sensor that the probe has moved from within a section of a drill pipe made ... | 12/27/1988 |
| 4736298 | Method of detecting collars using computerized pattern recognition A method of determining the location and dimensions of collars present along a section of casing. An inspection instrument is passed through the casing section generating an electromagnetic wave which permeates the casing. The phase shifted electromagneti... | 04/05/1988 |
| 4733380 | Apparatus and method for acoustically investigating a casing set in a borehole A method and apparatus for acoustically investigating a casing in a borehole are described. An electronically scannable acoustic transducer is formed on a planar circular surface and is oriented on a tool so as to direct circumferentially scannable beams ... | 03/22/1988 |
| 4718047 | Analysis of cement bonding utilizing temperature profiles A method of determining the presence of channels in the cement behind a well casing utilizing the temperature profiles of the well. In a first embodiment rate coefficients indicative of the rate of temperature change along a zone of investigation are calc... | 01/05/1988 |
