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| Number | Title | Issue Date |
| 5871577 | Methods of retarding cementitious compositions The present invention provides set retarding additives, set retarded hydraulic cement compositions and methods of using the set retarded cement compositions for cementing subterranean zones in wells. A preferred set retarding additive comprises an alkanol... | 02/16/1999 |
| 5851960 | Method of performing well drilling operations with a foamable drilling fluid A foamable drilling fluid for use in well operations such as deep water offshore drilling where risers are not employed in returning the fluid to the surface mud pit. A preferred foamable drilling fluid comprises a prehydrated clay such as bentonite, sea ... | 12/22/1998 |
| 5845711 | Coiled tubing apparatus The apparatus and method for injecting coiled tubing downhole includes a connector member disposed on the end of the coiled tubing and supporting a downhole tool. A packer member is releasably connected to the connector member. The packer member includes ... | 12/08/1998 |
| 5823273 | Well stabilization tools and methods The present invention relates to tools and methods for stabilizing incompetent or otherwise unstable subterranean zones or formations penetrated by a well bore during drilling. The methods basically comprise drilling the well bore through an enlarged port... | 10/20/1998 |
| 5803168 | Tubing injector apparatus with tubing guide strips A tubing injector apparatus for guiding coiled tubing and inserting the tubing into a well. The apparatus includes a tubing guide portion which has a curvilinear first frame and a curvilinear second frame spaced from the first frame. An elongated first gu... | 09/08/1998 |
| 5799731 | Tubing guide with optimized profile and offset An apparatus for guiding and directing tubing into a coiled tubing injector apparatus is disclosed. The tubing guide will direct the tubing into the coiled tubing injector apparatus for insertion or removal into the wellbore therebelow. The natural, or re... | 09/01/1998 |
| 5795924 | Resilient well cement compositions and methods The present invention provides resilient cement compositions and methods which are particularly useful in the construction and repair of oil and gas wells. The cement compositions have improved mechanical properties including elasticity and ductility and ... | 08/18/1998 |
| 5791380 | Methods of forming insulated pipeline bundles Methods of forming highly insulated pipeline bundles made up of one or more flow lines positioned within a continuous larger diameter outer sleeve are provided. The methods basically comprise the steps of filling the space between the outside of the flow ... | 08/11/1998 |
| 5789352 | Well completion spacer fluids and methods A well completion spacer fluid is provided which is particularly suitable for separating a cement slurry from drilling fluid in primary cementing operations. The well completion spacer fluid is also useful for separating other potentially incompatible flu... | 08/04/1998 |
| 5775433 | Coiled tubing pulling tool An improved coiled tubing pulling tool and methods of using the pulling tool for pulling a well tool from a well bore, relocating a well tool in the well bore and performing other similar operations. The pulling tool is basically comprised of an elongated... | 07/07/1998 |
| 5767671 | Method of testing the lifeline of coiled tubing To test coiled tubing, at least one test is performed on a coiled tubing that has been used, such as in an oil or gas well. Performing such test includes obtaining a specific output data event (e.g., a nondestructive evaluation test readout) for the used ... | 06/16/1998 |
| 5762142 | Coiled tubing apparatus The apparatus and method for injecting coiled tubing downhole includes a connector member disposed on the end of the coiled tubing and supporting a downhole tool. A packer member is releasably connected to the connector member. The packer member includes ... | 06/09/1998 |
| 5762139 | Subsurface release cementing plug apparatus and methods The present invention provides an improved subsurface release cementing plug apparatus for use in a string of pipe during the cementing of the pipe in a well bore. The apparatus includes a hollow cementing plug seat member adapted to be connected in the s... | 06/09/1998 |
| 5738463 | Elastomeric grouting of subsurface conduits The present invention provides methods of grouting a subsurface conduit whereby the hardened grout resists stress failures. The methods basically comprise the steps of forming a hardenable grout composition having elastomeric properties upon hardening, pl... | 04/14/1998 |
| 5738171 | Well cementing inflation packer tools and methods The present invention provides an improved cementing inflation packer tool and methods of using the tool. The tool includes of a tubular housing having a packer inflating port disposed therein and a packer inflating port opening sleeve slidably disposed w... | 04/14/1998 |
| 5722491 | Well cementing plug assemblies and methods An improved well cementing plug assembly adapted to be connected to a string of drill pipe or a circulation tool for use in a pipe during the cementing of the pipe in a well bore is provided. The top and bottom plugs are selectively releasable by activati... | 03/03/1998 |
| 5718292 | Inflation packer method and apparatus An inflation packer method and apparatus comprising at inflatable packer bladder and an inflation fluid. The packer apparatus further comprises a packer mandrel having a central flow passage therethrough and an outer packer body which includes the inflata... | 02/17/1998 |
| 5718287 | Apparatus for downhole injection and mixing of fluids into a cement slurry An apparatus for downhole injection and mixing of fluids into a cement slurry. The apparatus includes embodiments which either carry a fluid to the proper injection point in a wellbore or maintain it at the proper injection point until activated. In a fir... | 02/17/1998 |
| 5716910 | Foamable drilling fluid and methods of use in well drilling operations A foamable drilling fluid for use in well operations such as deep water offshore drilling where risers are not employed in returning the fluid to the surface mud pit. A preferred foamable drilling fluid comprises a prehydrated clay such as bentonite, sea ... | 02/10/1998 |
| 5712631 | Intrinsically safe data network An intrinsically safe data network, such as one defining a system for acquiring and transferring data from inside a hazardous zone at an oil or gas well to outside the hazardous zone, includes a fixed number of at least one data signal conductor and a fix... | 01/27/1998 |
| 5711383 | Cementitious well drilling fluids and methods The present invention provides cementitious well drilling fluids and methods of drilling subterranean well bores. The drilling fluids are basically comprised of water, a water viscosity increasing material and a cementitious material which when deposited ... | 01/27/1998 |
| 5711375 | Well stabilization tools and methods The present invention relates to tools and methods for stabilizing incompetent or otherwise unstable subterranean zones or formations penetrated by a well bore during drilling. The methods basically comprise drilling the well bore through an unstable subt... | 01/27/1998 |
| 5704393 | Coiled tubing apparatus The apparatus and method for injecting coiled tubing downhole includes a connector member disposed on the end of the coiled tubing and supporting a downhole tool. The connector member includes a dual check valve in the fluid passageway which allows fluid ... | 01/06/1998 |
| 5701959 | Downhole tool apparatus and method of limiting packer element extrusion An improved downhole tool apparatus and method for limiting the extrusion of packer element seals of packers and bridge plugs which utilize segmented packer retaining shoes when such tools are of larger diameters, or when used at elevated differential pre... | 12/30/1997 |
| 5697442 | Apparatus and methods for use in cementing a casing string within a well bore The present invention provides an apparatus in the form of a float shoe or collar for use in cementing a casing string within a well bore. The shoe or collar has blades extending therefrom for centering the shoe or collar, as well as the lower end of the ... | 12/16/1997 |
| 5696059 | Methods of preventing well cement stress failure Improved methods of cementing in a well are provided whereby stress failures in the resulting set cement are prevented or reduced. The methods basically comprise the steps of placing a foamed cement composition in a zone in the well to be cemented which w... | 12/09/1997 |
| 5688844 | Resilient well cement compositions and methods The present invention provides resilient cement compositions and methods which are particularly useful in the construction and repair of oil and gas wells. The cement compositions have improved mechanical properties including elasticity and ductility and ... | 11/18/1997 |
| 5672203 | Set retarded cementing compositions and methods The present invention provides set retarding additives, set retarded hydraulic cement compositions and methods of using the set retarded cement compositions for cementing subterranean zones in wells. A preferred set retarding additive comprises an alkanol... | 09/30/1997 |
| 5647434 | Floating apparatus for well casing Floating apparatus for well casing including a check valve disposed in a sleeve, wherein the sleeve is receivable within an outer case. In the case of a float collar, the outer case comprises coupled upper and lower casing string sections; while in the ca... | 07/15/1997 |
| 5636519 | Fluid commingling chamber for nitrogen processing unit An improved commingling chamber for the distribution and pressure equalization of a thermodynamic working fluid used in a recirculating liquid type heat transfer processing system. The improved commingling chamber includes a volumetric chamber generally d... | 06/10/1997 |
| 5622919 | Composition and method for controlling precipitation when acidizing wells A composition and method for acidizing a formation in the presence of ferric ion, free sulfur and/or sulfides is disclosed. The composition employs a ferric ion reducing agent and a sulfide reactant separately or in combination. The ferric ion reducing ag... | 04/22/1997 |
| 5609207 | Epoxy resin composition and well treatment method In one embodiment, an epoxy resin composition is provided comprising: an epoxy resin and a partially reduced aromatic amine hardening agent. In another embodiment, a well treating composition is provided comprising: an epoxy resin; a partially reduced aro... | 03/11/1997 |
| 5604300 | Crosslink test method Automated objective crosslink time and crosslink temperature determinations are provided in a method of testing for chemical crosslinking of a fluid. A fluid having a crosslinking agent is placed in a vessel and a paddle is rotated through the fluid in th... | 02/18/1997 |
| 5604186 | Encapsulated enzyme breaker and method for use in treating subterranean formations The present invention relates to a method of preparing an encapsulated enzyme breaker and method of use in treating a subterranean formation. An encapsulated breaker is prepared by coating an enzyme on a cellulose substrate. A micron-sized particulate is ... | 02/18/1997 |
| 5591700 | Fracturing fluid with encapsulated breaker An aqueous fracturing fluid composition and method for fracturing subterranean formations penetrated by a well bore wherein the fracturing fluid comprises a viscosity breaker that comprises a surfactant and a breaker which is solid at ambient surface cond... | 01/07/1997 |
| 5591381 | Corrosion inhibiting compositions and methods The present invention provides corrosion inhibiting compositions and methods whereby protective coatings are formed on metal surfaces. The compositions are basically comprised of a corrosion inhibiting condensation reaction product enhanced by the presenc... | 01/07/1997 |
| 5588488 | Cementing multi-lateral wells The present invention provides methods of cementing the junction of multi-lateral wells whereby the set cement can withstand impacts and shocks without shattering. A cement slurry composition which sets into a high strength impact resistant solid mass is ... | 12/31/1996 |
| 5588489 | Lightweight well cement compositions and methods The present invention provides lightweight, fast setting cement compositions and methods which can be utilized in performing a variety of well cementing operations. The cement compositions are basically comprised of slag cement, water sufficient to form a... | 12/31/1996 |
| 5585333 | Hydrocarbon base cementitious drilling fluids and methods Hydrocarbon base drilling fluids which are selectively convertible to cementitious compositions that set into hard substantially impermeable masses and methods of using such drilling fluids are provided. The drilling fluids are basically comprised of a hy... | 12/17/1996 |
| 5582249 | Control of particulate flowback in subterranean wells The addition of an adhesive coated material in intimate mixture with particulates for fracturing, gravel packing or other formation treatments decreases or substantially eliminates the flowback of particulates whether proppants or formation fines while st... | 12/10/1996 |
