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| Number | Title | Issue Date |
| 6004339 | Balloon catheter with multiple distensibilities A balloon is disclosed that has two differing rates of distensibility. It can be used to perform angioplasty by taking advantage of its high strength and relatively low distensibility up to a predetermined range of pressure and still be used to set a sten... | 12/21/1999 |
| 5988281 | Engageable metal seal pressure balanced stab The present invention provides for the connection of a pressure balanced stab and a manifold in which offsetting forces maintained on the stab allow it to remain in an inserted state within the manifold without the use of a significant amount of force to ... | 11/23/1999 |
| 5988287 | Thru-tubing anchor seal assembly and/or packer release devices A configuration is provided to anchor the tubing string into a polished-bore receptacle while providing the ability to disconnect the tubing string from the polished-bore receptacle in a single trip in the wellbore. The configuration of the anchor provide... | 11/23/1999 |
| 5971665 | Cable-laying apparatus and method A cable-laying technique and apparatus are disclosed. A base is lowered to the seafloor which contains multiple cable reels, each of which is preconnected to a surface production facility. An articulated plow is lowered onto the base and manipulates a ree... | 10/26/1999 |
| 5961123 | Metal back-up ring for downhole seals A sealing element for a packer or bridge plug or other downhole tool is illustrated which employs the use of back-up rings above and/or below a resilient seal. The various sleeves which are moved with respect to each other to compress the sealing element ... | 10/05/1999 |
| 5961861 | Apparatus for laser alloying induced improvement of surfaces A feedback control system for performing and controlling the laser alloying of a workpiece. The apparatus includes a laser beam delivery system, a movement system capable of causing relative movement between a laser beam and a workpiece being irradiated b... | 10/05/1999 |
| 5958877 | Method for counteracting vasospasms, ischemia, renal failure, and treating male impotence using calcitonin gene related peptide The present invention provides a method for counteracting vasospasms and treating male impotence using calcitonin gene-related peptide (CGRP). CGRP is a naturally occurring substance in the human body. As such, CGRP does not have the same toxicity and all... | 09/28/1999 |
| 5955666 | Satellite or other remote site system for well control and operation The downhole portion of the system of the present invention provides entirely downhole methods and apparatus for the monitoring and control of wells. The components of the system are modular. There are sensor and control valve components located in each o... | 09/21/1999 |
| 5947201 | One-trip window-milling method A one-trip whipstock milling system is disclosed which allows for setting of a packer or plug which is run in as part of the bottomhole assembly, in conjunction with orientation instrumentation, a whipstock, and a one-trip milling system connected to the ... | 09/07/1999 |
| 5938636 | Autoinfuser for resuscitation and method of infusion fluid injection The present invention relates to an apparatus for injecting infusion fluids into a patient at a controlled infusion rate. This apparatus is referred to as a "controlled autoinfuser". A preferred embodiment of the invention comprises a computer capable of ... | 08/17/1999 |
| 5924491 | Thru-tubing anchor seal assembly and/or packer release devices A configuration is provided to anchor the tubing string into a polished-bore receptacle while providing the ability to disconnect the tubing string from the polished-bore receptacle in a single trip in the wellbore. The configuration of the anchor provide... | 07/20/1999 |
| 5920032 | Continuous power/signal conductor and cover for downhole use Conductors are placed in insulator which acts as a spacer/centralizer for the conductors, which are in turn mounted within tubing. The void spaces between the insulator and the tubing inside wall can be filled with a sealing material. Alternatively, the v... | 07/06/1999 |
| 5914785 | Method and apparatus for making absolute range measurements This invention relates to a method and apparatus for making absolute distance or ranging measurements using Fresnel diffraction. The invention employs a source of electromagnetic radiation having a known wavelength or wavelength distribution, which sends ... | 06/22/1999 |
| 5911284 | Downhole mud motor A downhole motor operated by circulating mud fluid in the wellbore is revealed. The motor has nested rotors and is geared to a bit drive. The motor is a dual-rotor pump that is operated as a motor with mud flow through the rotor housing on end connections... | 06/15/1999 |
| 5909770 | Retrievable whipstock A thru-tubing retrievable whipstock is disclosed. A running tool creates relative movement to pivot out anchors at the lower end of the whipstock to accomplish its support. The setting force is trapped by spring-loaded wedges. The whipstock can be release... | 06/08/1999 |
| 5908161 | Variable flow control device for precision application The present invention relates to an apparatus for variable flow control for precision applications, such as agrochemical applications. The invention is directed towards a flow control device comprising a metering rod moveably mounted within a housing. The... | 06/01/1999 |
| 5906220 | Control system with collection chamber A control system for the operation of the subsurface safety valve is disclosed. The control system uses a pressurized gas chamber, as well as a shuttle valve which connects to the main fluid pressure supply from the surface. The shuttle valve is connected... | 05/25/1999 |
| 5899281 | Adjustable bend connection and method for connecting a downhole motor to a bit An adjustable bend connection is provided which desirably extends from the power section of a downhole progressing-cavity-type mud motor. The joint is secured internally so that any reverse rotation of the bend housings that may occur does not result in u... | 05/04/1999 |
| 5897095 | Subsurface safety valve actuation pressure amplifier A hydraulic pressure booster is disclosed which, when used in conjunction with a control system for a subsurface safety valve, allows the use of lower pressure ratings on the wellhead equipment, yet at the same time provides sufficient hydraulic pressure ... | 04/27/1999 |
| 5882332 | Drug infusion catheter and method A method and apparatus of delivery of a drug (or substance) is disclosed which involves (1) injecting a drug into the tissue of the blood vessel; (2) maintaining the delivery system as symmetrical as possible in tortuous blood vessels, and (3) providing a... | 03/16/1999 |
| 5881808 | Window-cutting system for downhole tubulars A guide lug for a starting or window mill is provided at the upper end of the whipstock. A back-up shoulder is provided to act against any tendencies of the mill to whirl. A taper is provided for use in guiding the mill toward the casing for the cutting o... | 03/16/1999 |
| 5873414 | Bypass valve for downhole motor A bypass valve, particularly useful for allowing a tubing string to fill or drain during tripping in and tripping out, is disclosed. The bypass valve can be used in conjunction with a downhole motor operated through a tubing string. The bypass valve featu... | 02/23/1999 |
| 5865172 | Method and apparatus for induction of inhaled pharmacological agent by a pediatric patient This invention relates to an apparatus for inducing a pediatric patient breathing gas through a face mask to inhale a fluid pharmacological agent. The apparatus comprises a fluid conduit through which fluid pharmacological agent may be inhaled, and a sens... | 02/02/1999 |
| 5865261 | Balanced or underbalanced drilling method and apparatus A casing or tubing segment or segments are disclosed which can be used to create a parasite annulus during drilling. The cased wellbore receives a string containing valves and the drillstring operates through it. As the mud circulates, the segments of the... | 02/02/1999 |
| 5862865 | Insert gas lift system An insert tool for pre-existing casing is disclosed which allows the use of existing control line connections to facilitate independent operation of a pair of safety valves. The insert is particularly useful when a pre-existing well is converted to gas li... | 01/26/1999 |
| 5861035 | Modular prosthetic conduit The present invention relates to a modular prosthetic conduit implantable within a mammal and a method of surgically implanting and replacing such a conduit. Specifically, the present invention is directed toward a conduit comprising a first conduit membe... | 01/19/1999 |
| 5856790 | Remote control for a plug-dropping head An apparatus and method of dropping a pumpdown plug or ball is revealed. The assembly can be integrally formed with a plug-dropping head or can be an auxiliary feature that is mounted to a plug-dropping head. The release mechanism is actuated by remote co... | 01/05/1999 |
| 5849188 | Wire mesh filter A filter is provided which combines a woven wire mesh over a supporting body. The supporting body is typically a metal perforated tube which provides fluid communication between the well bore and the production equipment string. The woven wire mesh acts a... | 12/15/1998 |
| 5845669 | Vent valve A bleed valve design for a wireline pressure setting tool is disclosed. The chamber within the setting tool is vented through a bleed valve assembly which features a rupture disk secured over an opening with an O-ring seal. A piercing tool is used and in ... | 12/08/1998 |
| 5833004 | Running liners with coiled tubing A method is disclosed which allows running liners with external casing packers on coiled tubing in a single trip. The compact design afforded by being able to support the liner near its lower end adjacent the lowermost external casing packer allows for a ... | 11/10/1998 |
| 5833002 | Remote control plug-dropping head An apparatus and method of dropping a pumpdown plug or ball is revealed. The assembly can be integrally formed with a plug-dropping head or can be an auxiliary feature that is mounted to a plug-dropping head. The release mechanism is actuated by remote co... | 11/10/1998 |
| 5835451 | Offshore seismic prospecting method using a hydrophone-geophone sensor pair A method of seismic prospecting offshore by means of at least one pair of hydrophone-geophone sensors disposed at the water bottom, in which a sound source at the surface of the water emits a sound signal and the sensors at the water bottom take hydrophon... | 11/10/1998 |
| 5829964 | Flare line gas purge system In the context of an oil and gas drilling rig flare system, a purge system is introduced so that in the event of a flammable gas release at the rig, the purge system can be activated. Activation of the system shuts off gas supply from a separator in the m... | 11/03/1998 |
| 5829520 | Method and apparatus for testing, completion and/or maintaining wellbores using a sensor device The present invention is an improved method and apparatus for testing and monitoring wellbore operations. The invention is (1) a data acquisition device capable of monitoring, recording wellbore and/or reservoir characteristics while capable of fluid flow... | 11/03/1998 |
| 5826652 | Hydraulic setting tool A packer is disclosed having a setting piston mounted on the body thereof. The packer is hydraulically set prior to treating or cementing. The packer has a sliding sleeve valve which is open during run-in. After the packer has set, the setting tool is rel... | 10/27/1998 |
| 5813458 | Indicating dog sub for weight-set packers A dog sub is provided for use in an assembly for running liners with a weight-set packer. The dog sub allows rotation of the work string in an effort to set down weight on the dogs. The dogs are allowed to move radially outwardly by a pick-up force from t... | 09/29/1998 |
| 5810082 | Hydrostatically actuated packer A packer is disclosed which uses applied pressure to set the slips and initiate a compressive force on the sealing elements. The compressive force applied to the sealing elements moves components above the sealing elements and allows the available hydrost... | 09/22/1998 |
| 5806590 | Torque-resistant slip The invention relates to a slip design with substantially longitudinally oriented wickers, which can be used alone or in combination with transversely oriented wickers, to secure a downhole tool, such as a bridge plug or packer, against rotational forces,... | 09/15/1998 |
| 5806596 | One-trip whipstock setting and squeezing method A one-trip assembly that includes the mill or mills for milling a window, the whipstock, the whipstock anchor or packer, and a valving assembly is disclosed which permits running in all the equipment needed for setting and orienting a whipstock and squeez... | 09/15/1998 |
| 5803175 | Perforating gun connection and method of connecting for live well deployment A connector is presented for tubing conveyed perforating guns which facilitates connection or disconnection between guns without the need for rotation. A latching mechanism is disclosed which latches by setting down weight and unlatches by an actuating ra... | 09/08/1998 |
