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| Number | Title | Issue Date |
| 7950449 | Stress and torque reducing tool A stress and torque reducing tool has a plunger that reciprocates inside of a body. The tool is connected between the pump and the sucker rod string and reduces stress transmitted therebetween. The body and plunger have longitudinally extending surfaces located at t... | 05/31/2011 |
| 7347256 | Portable well fluid extraction apparatus Well fluid extraction apparatus includes a resiliently downwardly biased discharge head and a canister lowerable from the discharge head into the well to receive fluid therefrom, and then liftable into telescoped engagement with the discharge head. A specially confi... | 03/25/2008 |
| 7150325 | ROV retrievable sea floor pump A subsea pumping assembly locates on a seafloor for pumping well fluid from subsea wells to the level. The pumping assembly has a tubular outer housing that is at least partially embedded in the seafloor. A tubular primary housing locates in the outer housing and ha... | 12/19/2006 |
| 7025134 | Surface pulse system for injection wells The present invention relates to petroleum recovery operations, and more particularly, to the use of pulse technology to enhance the effectiveness of waterflooding operations. The systems of the present invention generally comprise an injection means for continually... | 04/11/2006 |
| 6978830 | Downhole latch A progressive cavity pump pumps liquid downhole to a lower formation past a packer set in a casing of a wellbore. The rotor of the pump is axially restrained by a bearing assembly spaced below the pump for controlling uphole reactive loading on the rotor. Preferably... | 12/27/2005 |
| 6830441 | Valve for downhole pump A downhole pump having a barrel with a reciprocating plunger therein has at least one valve. The valve has a cage, a seat and a ball. The cage has a passageway extending between two ends, with the passage including a ball chamber. The ball chamber is between a perfo... | 12/14/2004 |
| 6705399 | Method for transforming a gas-liquid stream in wells and device therefor A method and device for forming a preferred gas liquid flow structure via separation of liquid and gas phases. The method and device relate to the production of gas and oil in wells. The operation and spacing of the devices ensure that the quantity of liquid moved u... | 03/16/2004 |
| 5915475 | Down hole well pumping apparatus and method A method and apparatus for pumping formation liquids provides a reciprocating down hole pump on the end of a coiled tubing string. In one embodiment, one fluid flow path is provided through the inside of the coiled tubing and another flow path is provided... | 06/29/1999 |
| 5005651 | Downhole pump unseating apparatus and method A fluid producing well has a downhole pump assembly located at a lower end of a tubing string for producing fluid from a pay zone. Some parts of the pump are affixed to a hold-down and the hold-down is telescopingly received in sealed relationship within ... | 04/09/1991 |
| 4940088 | Sonde for taking fluid samples, in particular from inside an oil well In order to take a practically unlimited number of fluid samples, in particular from a well in production, a sonde is used including as many modular sampling devices (10) as there are samples to be taken. These devices (10) are disposed end-to-end and the... | 07/10/1990 |
| 4924940 | Downhole cleanout tool A downhole tool for removing sand from a well bore has an elongated tubular member with four sections. A one-way valve is located between the upper first and second sections. A second one-way valve is located between the third and fourth sections, while a... | 05/15/1990 |
| 4745969 | In-casing hydraulic jack system A hydraulic jack system for operating well bottom pumping units via a sucker rod string and polish rod that comprises a jack unit that is designed for mounting by being suspended fully within a well casing with a seal being created between the periphery o... | 05/24/1988 |
| 4721156 | Well clean out apparatus A well clean out apparatus of the reciprocating pump, recirculating, type has two debris entrapment chambers below and one fluid chamber above the pump. The pump piston has a stack of flat washers to function as piston packing. The washers are axially and... | 01/26/1988 |
| 4478285 | Method and apparatus for removal of downhole well debris A method and apparatus for removing downhole well debris involves an elongate string operable to pump the debris from a well into the string. A pumping portion of the string includes a hollow piston with a hollow, splined piston rod fixed to the upper por... | 10/23/1984 |
