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| Number | Title | Issue Date |
| 5230363 | Suction valve for high pressure slurry pump Where on the valve seating surfaces due to the high pressure pumping of abrasive slurry through an in-line valve is greatly reduced by providing first and second valve seating surfaces which are engaged, respectively by first metal and first elastomeric c... | 07/27/1993 |
| 5229017 | Method of enhancing methane production from coal seams by dewatering Dewatering of coal seams for facilitating the production of gas therefrom through a well is effected by treating the coal seam utilizing a well treatment fluid containing a dewatering aid which both enhances the permeability of the formation to water prod... | 07/20/1993 |
| 5203413 | Product and process for acid diversion in the treatment of subterranean formations The invention relates to the treatment by a fluid, or more generally by an acid fluid, of subterranean formations located in particular around an oil, gas, water or geothermal well. Acid is diverted towards the zone to be treated by a surfactant flush, the ... | 04/20/1993 |
| 5199489 | Method of cementing well casing to avoid gas channelling from shallow gas-bearing formations Gas channeling to the surface in the setting of surface casing can be avoided by employing a cementing process in which a right-angle setting cement is positioned within a wellbore annulus between the wellbore and the casing above a gas-bearing zone with ... | 04/06/1993 |
| 5197324 | Methods and apparatus using a gel to isolate mainline valves in a pipeline during a hydrotest In accordance with illustrative embodiments of the present invention, the mainline valves in a crude oil, gas, water or other product pipeline are positively sealed off to allow a hydrotest to be made of a section or segment of the pipeline between the va... | 03/30/1993 |
| 5190675 | Gelling organic liquids A method of producing a gel of an organic liquid, using a metal phosphate ester in which all of the reagents are substantially free of water and pH-affecting substances. The gel is particularly useful in fracturing subterranean formations by entraining a ... | 03/02/1993 |
| 5180500 | Chemical removal of thiourea from hydrochloric acid A chemical method of removing thiourea from spent hydrochloric acid cleaning solutions comprising the steps of: adjusting the pH to not less than 12 by addition of base to remove metal hydroxides; oxidizing thiourea to urea by the addition of at least a s... | 01/19/1993 |
| 5171041 | Reinforced flanges on plastic pipe A method an apparatus are shown for forming a flange on an end of a plastic pipe liner of the type used to line a tubular member. A reinforced disc having a rigid portion and an elastomeric portion is placed about the liner exterior and moved into positio... | 12/15/1992 |
| 5165474 | Anti-rotation device for cementing plugs with deformable peripheral "fins" o "lips" Cement plugs used in the cementing of casing in a borehole drilled into a subterranean formation are restrained from rotation by being forced into a portion of the casing and check valve apparatus which includes a reduced diameter section formed as a cont... | 11/24/1992 |
| 5145340 | Packing for piston and valve machine A packing is disclosed for piston and valve machine, an annular metal body (20) intended to be immobilized in the first recess by a clamping nut and, in its internal pheripheral face (24), an annular second recess (25), a gasket holding and stress ring (2... | 09/08/1992 |
| 5120471 | Process and composition for protecting chrome steel A composition and method for inhibiting the corrosion of steel containing greater than about 9% chromium in the presence of at least one mineral acid, especially at temperatures above 250° F. The composition is made of a corrosion inhibitor selected from... | 06/09/1992 |
| 5105659 | Detection of fracturing events using derivatives of fracturing pressures In accordance with illustrative embodiments of the present invention, a method of determining fracture behavior from downhole pressure measurements that are made during a hydraulic well fracturing operation includes pumping fracturing fluids at a constant... | 04/21/1992 |
| 5103905 | Method of optimizing the conductivity of a propped fractured formation Method of reducing the viscosity of a fracturing fluid containing a polymer by introducing both delayed breaker and nondelayed breaker into the fracturing fluid. Preferably, the relative amounts of delayed and undelayed breaker are determined by first det... | 04/14/1992 |
| 5103910 | Delayed rigid foam systems and applications in particular for selective plugging treatments in the oil industry The invention comprises a selective plugging treatment with good penetration for acid diversion or water control. The fluid comprises a foamed delayed gelation system.... | 04/14/1992 |
| 5103913 | Method of fracturing high temperature wells and fracturing fluid therefore The high temperature stability of an aqueous fracturing fluid is extended for use in high temperature (above 300° F.) subterranean formations through the addition of quantities of unhydrated, particulate guar or guar derivative polymers prior to the pump... | 04/14/1992 |
| 5101902 | Aqueous spacer composition compatible with drilling muds and cement slurries An aqueous spacer composition, compatible with drilling muds and cement slurries including saline slurries, and application there of drilling oil and gas wells. Preferred spacer bases in accordance with the invention comprise a biopolymer of the type prod... | 04/07/1992 |
| 5096618 | Process and composition for inhibiting high-temperature iron and steel corrosion A composition and method for inhibiting corrosion of iron and steel in the presence of aqueous acid at high temperatures, containing an alkenylphenone having the following structure: ##STR1## wherein R1 may be aryl of 6 to about 10 carbons... | 03/17/1992 |
| 5090079 | Apparatus for cleaning pipe An apparatus is shown for cleaning a pipe. The apparatus includes a rigid stem and a motor stationarily mounted on the stem. An outer body surrounds the motor and is rotatably mounted on the rigid stem. A fluid conduit is connected to the stem and to a so... | 02/25/1992 |
| 5086840 | Delayed rigid foam systems and applications in particular for plugging selective treatments in the oil industry The invention concerns delayed gelation systems which are injected under the shape of a foam in the chosen formations. The choise of an either oil compatible, or water compatible foaming agent allows obtaining a remarkable process selectivity. Plugging; acid d... | 02/11/1992 |
| 5069280 | Gravel packer and service tool A gravel packer and service tool combination for use in subterranean wells operates sequentially to lock and seal the packer in the well at a producing formation, release a mechanical connection between the packer and service tool, and open a passage thro... | 12/03/1991 |
| 5046856 | Apparatus and method for mixing fluids Plug flow through a series of tanks in fluid communication is effected by the addition of radial flow impeller means to at least one of the tanks. Plug flow through the tanks allows for sufficient residence time in the series of tanks to effect complete h... | 09/10/1991 |
| 5036919 | Fracturing with multiple fluids to improve fracture conductivity Conductivity damage is decreased in fracturing a high temperature (greater than 200° F.) well by employing a first fracturing fluid which is substantially stable at the bottom hole static temperature and pumping a second fracturing fluid behind the first... | 08/06/1991 |
| 5020592 | Tool for treating subterranean wells A method and apparatus for treating subterranean wells includes a tool supported on a one-piece support tube which operates to raise and lower the tool in the well to a position where well treatment is required. The tool provides inflatable packers and a ... | 06/04/1991 |
| 5013483 | Process and composition for inhibiting iron and steel corrosion A composition and method for inhibiting corrosion of iron and steel in the presence of aqueous acid, especially concentrated hydrochloric acid comprising at least 5% by weight HCl, comprising an effective corrosion inhibiting amount of an alkenylphenone h... | 05/07/1991 |
| 5006177 | Process and composition for cementing wells passing through salt formations The present invention relates to a composition for cementing, containing a small amount of NaCl and from 35 to 150 l/t of sodium silicate. A cement-salt bond having good characteristics such as rheology, fluid loss, etc. . . . is obtained.... | 04/09/1991 |
| 4984632 | Hydraulic release joint for tubing systems A tubing release coupling which does not require rotation to effect release incorporates a collet which is retained within a groove by a collet retainer located on an axially movable piston. The piston is retained in place thereby locking the collet by a ... | 01/15/1991 |
| 4984634 | Logging of subterranean wells using coiled tubing An apparatus for production logging of a well utilizing artificial lift in a wellbore comprises coiled tubing extending into the wellbore, the coiled tubing having gas injector means provided on its remote end and including means for electrical communicat... | 01/15/1991 |
| 4974245 | System for the assembly of a metal joining piece and a high pressure composite material tube notably applications for equipment used in the oil industry Device to permanently link a metal joining piece and a composite material tube, to a tube subjected to static pressure up to 150 MPa. The assembly consists of a metal part constituting a sealing (8) and joining (7) piece with a collar (2), onto which the ... | 11/27/1990 |
| 4969523 | Method for gravel packing a well A method of packing a well, particularly an oil, gas or water well comprises injecting a particle/liquid slurry into a wellbore wherein the particles comprise particles of at least two different densities independently selected from the density range of a... | 11/13/1990 |
| 4969526 | Non-interfering breaker system for delayed crosslinked fracturing fluids at low temperature A tertiary amine hydrochloride/persulfate breaker system as disclosed which effects complete breaks of polysaacharide-based gels or fluids in a the ambient temperature range without interfering with delayed crosslink mechanism in the fracturing fluid. The... | 11/13/1990 |
| 4940095 | Deployment/retrieval method and apparatus for well tools used with coiled tubing A method of inserting a well service tool for operating a coiled tubing which avoids the high and/or remote mounting of the heavy coiled tubing injector drive mechanism is disclosed. The method comprises assembling the well service tool within a closed en... | 07/10/1990 |
| 4940093 | Gravel packing tool An apparatus for closing a reverse circulation passage and opening a crossover fluid passage in a gravel packing service tool which sets a well packer comprises a closure means for closing the reverse circulation passage and an opening means for opening t... | 07/10/1990 |
| 4936618 | Grapple connection for coiled tubing A grapple connection for interconnecting coiled tubing with a well tool comprises first and second tapered split rings and a double-tapered intermediate split ring enclosed in a cylindrical, threaded housing. When the housing is rotated with threaded engagemen... | 06/26/1990 |
| 4920795 | Electromagnetic flowmeter for conductive or dielectric fluids and its applications in particular oilfield The invention is a non-intrusive system for measuring the flow rates of insulating or conducting fluids in conduits. It results from the combination of an electromagnetic flowmeter, operating with conducting fluids, and of a triboelectric noise cross-corr... | 05/01/1990 |
| 4919209 | Method for treating subterranean formations A method for breaking the fracturing fluid comprises injecting into the subterranean formation a controlled release breaker capsule including an enclosure material enveloping a breaker. The enclosure material is sufficiently permeable to at least one flui... | 04/24/1990 |
| 4915173 | Method for staged placement of gravel packs A well penetrating a subterranean fluid producing formation can effectively be gravel packed by a process which begins with an initial low gravel loading in the carrier fluid, the gravel loading gradually being increased over the course of the gravel pack... | 04/10/1990 |
| 4911241 | Constant viscosity foam A method of preparing either foamed or nonfoamed fracturing fluids which maintain an at least substantially constant viscosity during the introduction of varying concentrations of proppant. The at least substantially constant viscosity fluids of the prese... | 03/27/1990 |
| 4889563 | Process for retarding and controlling the formation of gels or precipitates derived from aluminium and corresponding compositions, plus the corresponding applications-in particular regarding oil wells Process for retarding and controlling the formation of gels or precipitates derived from aluminum and corresponding compositions, plus the corresponding applications--in particular regarding oil wells.... | 12/26/1989 |
| 4862957 | Packer and service tool assembly A packer and service tool assembly for oil or gas well preparation includes a disengageable coupling mechanism which permits the tool to be screwed into and out of the packer and which can be hydraulically disengaged so that the tool can be removed withou... | 09/05/1989 |
| 4862962 | Matrix treatment process for oil extraction applications The matrix treatment of a subterranean formation is adjusted in real time to minimize formation damage as indicated by the skin factor. The process comprises initial injecting an inert fluid into the formation and observing the variation in injection pres... | 09/05/1989 |
