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| Number | Title | Issue Date |
| 7918269 | Drainage of heavy oil reservoir via horizontal wellbore Systems and methods for drainage of a heavy oil reservoir via a horizontal wellbore. A method of improving production of fluid from a subterranean formation includes the step of propagating a generally vertical inclusion into the formation from a generally horizonta... | 04/05/2011 |
| 7814968 | Gravity drainage apparatus A hydrocarbon production apparatus comprises an injection well, perforated casing, hydrocarbon viscosity reducing fluid injection tubing, a first wellbore restrictor, and a production well. The injection well is bored above the production well within a hydrocarbon r... | 10/19/2010 |
| 7748443 | Dual packer for a horizontal well A dual packer for at least partially defining a production zone in a wellbore, the dual packer including a packer body having an up-hole side and a down-hole side. A first through bore and a second through bore each extend through the packer body from the up-hole si... | 07/06/2010 |
| 7637316 | Wellbore system A wellbore system is provided for the production of hydrocarbon fluid from a hydrocarbon fluid reservoir (4) in an earth formation. The wellbore system comprises a first wellbore (18) drilled from a first surface location at a horizontal distance from ... | 12/29/2009 |
| 7434613 | Surface controlled subsurface lateral branch safety valve A surface controlled subsurface lateral branch safety valve provides flow control for each branch wellbore in a multilateral well. In a described embodiment, a completion system for a well having an intersection between parent and branch wellbores includes an appara... | 10/14/2008 |
| 7413020 | Full bore lined wellbores Embodiments of the present invention generally provide methods and apparatus for forming a tubular-lined wellbore which does not decrease in diameter with increasing depth or length. Methods and apparatus for forming a substantially monobore well while drilling with... | 08/19/2008 |
| 7409993 | Weight spacer apparatus A weight spacer apparatus has a carrier which is tubular in shape and a spacer tube which is also tubular in shape for insertion into the carrier. The weight spacer apparatus also has a plurality of weight bars which may be inserted into the spacer tube after the sp... | 08/12/2008 |
| 7401665 | Apparatus and method for drilling a branch borehole from an oil well A wireline drill train is used to drill an elongated, small diameter, lateral branch borehole from near the base of a main well. The drill train, includes a drill module, a first self-propelled thrust module coupled to the drill module, and a second self-propelled t... | 07/22/2008 |
| 7401652 | Multi-perf fracturing process A method is shown for fracturing a subterranean formation from a deviated well bore. A plurality of spaced fracture initiation points are created in the well bore. Hydraulic pressure is applied to all of the sets of perforations at the fracture initiation points to ... | 07/22/2008 |
| 7377322 | Method and apparatus for cementing production tubing in a multilateral borehole A hydraulically actuated anchor and a mechanically actuated packer are used in combination to secure a production tubing system in a lateral prior to injection of a cement to line the lateral borehole in which the production tubing is positioned. The packer is expan... | 05/27/2008 |
| 7373984 | Lining well bore junctions A well bore liner is carried on a working string into a main bore of a well. A well bore liner is directed from the main bore into an auxiliary bore of the well with a whipstock. The whipstock is coupled to a working string without withdrawing the working string fro... | 05/20/2008 |
| 7370696 | Wellbore system for producing fluid A well system for producing fluid from an earth formation. A primary wellbore section produces the fluid from the well system to the surface. The primary wellbore section includes a cylindrical member having a number of apertures. At least one flanking wellbore runs... | 05/13/2008 |
| 7370701 | Wellbore completion design to naturally separate water and solids from oil and gas A wellbore completion design is provided, which creates a convective flow action that separates water and sand from hydrocarbons during production of the hydrocarbons from a subterranean formation. A deviated section of the wellbore creates the desired effect. The w... | 05/13/2008 |
| 7360595 | Method and system for underground treatment of materials A method for underground treatment of subsurface materials comprises providing an injection pattern and a recovery pattern, the injection pattern and the recovery pattern located proximate to a subsurface treatment zone and at least one of the injection pattern and ... | 04/22/2008 |
| 7357182 | Method and apparatus for completing lateral channels from an existing oil or gas well A method and apparatus for completing a lateral channel from an existing oil or gas well includes a well perforating tool for perforating a well casing at a preselected depth, and a lateral alignment tool for directing a flexible hose and blaster nozzle through a pr... | 04/15/2008 |
| 7353878 | Apparatus and method for wellbore isolation An apparatus for isolating a selected leg of a wellbore from the remainder of the wellbore includes a packer positionable in the selected leg of the wellbore, a tube extending through the packer from an uphole side of the packer to a downhole side of the packer to p... | 04/08/2008 |
| 7353877 | Accessing subterranean resources by formation collapse A subterranean zone can be accessed from the surface by forming a well bore extending from the surface into the subterranean zone. A tubing string is provided within the well bore, and an underreamer passed over the tubing string to a specified location within the s... | 04/08/2008 |
| 7353867 | Whipstock assembly and method of manufacture The present invention discloses a whipstock assembly (100) for use in forming a lateral borehole from a parent wellbore. The whipstock assembly comprises a body (122) and a deflection member 120) above the body. The deflection member includes a ... | 04/08/2008 |
| 7337846 | Surface controlled subsurface lateral branch safety valve A surface controlled subsurface lateral branch safety valve provides flow control for each branch wellbore in a multilateral well. In a described embodiment, a completion system for a well having an intersection between parent and branch wellbores includes an appara... | 03/04/2008 |
| RE40067 | Downhole equipment tools and assembly procedures for the drilling, tie-in and completion of vertical cased oil wells connected to liner-equipped multiple drainholes Single horizontal wells drilled through heterogeneous reservoirs are capable of greater oil productivity than vertical wells, often with lower produced GOR and WOR. Multiple drainholes tied-in to a vertical cased well are even more beneficial. Completion of such dra... | 02/19/2008 |
| 7331387 | Downhole window finder and method of using the same The present invention relates to a downhole method and apparatus for locating a window in a wellbore casing and determining the depth and orientation of said window. Apparatus of the present invention comprises a body (4) and a window engaging member (6 | 02/19/2008 |
| 7328743 | Toe-to-heel waterflooding with progressive blockage of the toe region A modified toe-to-heel waterflooding (TTHW) process is provided for recovering oil from a reservoir in an underground formation. After establishing the conventional TTHW waterflood, the process includes placing a chemical blocking agent at the watered out producing ... | 02/12/2008 |
| 7320366 | Assembly of downhole equipment in a wellbore A system and method for assembly of downhole equipment in a subterranean well. In a described embodiment, a method of assembling an apparatus in a subterranean well includes the steps of: positioning an expandable shell in the well; expanding the shell in the well; ... | 01/22/2008 |
| 7318473 | Methods relating to maintaining the structural integrity of deviated well bores Methods of enhancing at least partially the structural integrity of a longitudinal portion of a deviated well bore are provided. The methods include providing a gravel matrix composition; providing a longitudinal portion of a deviated well bore; and placing a suffic... | 01/15/2008 |
| 7311152 | Gas operated pump for hydrocarbon wells The present invention generally relates to an apparatus and method for improving production from a wellbore. In one aspect, a downhole pump for use in a wellbore is provided. The downhole pump includes two or more chambers for the accumulation of formation fluids an... | 12/25/2007 |
| 7303006 | Method for improved vertical sweep of oil reservoirs In a WAG flood oil is displaced from a subterranean formation by injecting water alternately with gas into a single injection completion per pattern. The ratio of water to gas injected is the WAG ratio. In this invention, two separate injection completions are used ... | 12/04/2007 |
| 7299864 | Adjustable window liner A system for lining a junction between a main bore and an auxiliary bore includes a first tubing adapted to line at least a portion of the main bore. The first tubing has a lateral opening therein. A second tubing has a junction shield extending outward therefrom. T... | 11/27/2007 |
| 7299878 | High pressure multiple branch wellbore junction A high pressure multiple branch wellbore junction. A wellbore junction system includes a wellbore junction with at least three bores extending therethrough. Exits of the three bores are axially spaced apart. At least two deflectors are formed on the wellbore junctio... | 11/27/2007 |
| 7284614 | Wellbore system for simultaneous drilling and production A wellbore system for simultaneously drilling a wellbore into an earth formation and producing hydrocarbon fluid from the wellbore, is provided. The system comprises a production tubing extending into the wellbore and having a hydrocarbon fluid inlet arranged in a f... | 10/23/2007 |
| 7273109 | Puller-thruster downhole tool A method and apparatus for propelling a tool having a body within a passage. The tool includes a gripper including at least a gripper portion which can assume a first position that engages an inner surface of the passage and limits relative movement of the gripper p... | 09/25/2007 |
| 7273108 | Apparatus to allow a coiled tubing tractor to traverse a horizontal wellbore Apparatus and methods are provided for removing sand and/or other fill material located in a wellbore ahead of a coiled tubing tractor and displacing the material behind the tractor. More particularly, the apparatus and methods of the present invention allow a coile... | 09/25/2007 |
| 7270178 | Horizontally oriented gas separator A gas restrictor for an intake of a horizontally oriented submersible well pump has a tubular housing and a number of apertures. A sleeve is mounted within the housing for rotation relative to the housing. The sleeve has an axially extending row of slots. At least o... | 09/18/2007 |
| 7267175 | Apparatus and methods for forming a lateral wellbore A method and system of forming a lateral wellbore in a time and trip saving manner using a mill/drill to locate and place a casing window. In one aspect of the invention, a lateral wellbore is drilled with liner which is subsequently left in the lateral wellbore to ... | 09/11/2007 |
| 7264048 | Slot cavity A method for accessing a subterranean zone from the surface includes drilling a substantially vertical well bore from the surface to the subterranean zone and forming a slot cavity in the substantially vertical well bore proximate to the subterranean zone. The slot ... | 09/04/2007 |
| 7264067 | Method of drilling and completing multiple wellbores inside a single caisson A method and apparatus for drilling and completing multiple wellbores from a single drilling rig and from within a single wellhead is provided. In one embodiment, a template is disposed at a predetermined location downhole within a casing. In one aspect, a first cas... | 09/04/2007 |
| 7258163 | Method and system for production of gas and water from a coal seam using well bores with multiple branches during drilling and after drilling completion A system for producing gas and water from a gas bearing strata during and after drilling completion. The system includes a directional drilling system, a main bore and pump. The directional drilling system includes a drill and a drill string. The main bore intersect... | 08/21/2007 |
| 7255725 | Porous inorganic membrane containing carbon; a process for its preparation; and use thereof A porous inorganic membrane comprises at least one inorganic phase having separating properties. Said membrane has a carbon content representing 0.05% to 25% by weight with respect to the mass of said inorganic phase and is selective to non-condensable gases. It is ... | 08/14/2007 |
| 7243738 | Multi seam coal bed/methane dewatering and depressurizing production system A process for underbalanced drilling into multiple coal and shale formations, and dewatering the drilled formations, which includes drilling a first borehole through several coal seams to a certain depth; lowering an upstock on the end of a carrier string to the dep... | 07/17/2007 |
| 7234526 | Method of forming a sealed wellbore intersection An expanding wellbore junction system, apparatus and methods are provided for forming a sealed wellbore intersection in a subterranean well. In one described method, an expandable wellbore junction is expanded within an under-reamed cavity in a wellbore. Intersectin... | 06/26/2007 |
| 7231979 | Short radius whipstock system A short radius exit from a window milled in casing is possible using a whipstock with a sloping surface in excess of 3.5° and a window mill whose diameter is reduced to a percentage generally below about 95% of the casing inside diameter in a mono-bore or non-throu... | 06/19/2007 |
