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Class Information
Number: 417/56
Name: Pumps > Drilled well free piston-type pump
Description: Apparatus in which the pump has a piston which reciprocates within an elongated cylinder of uniform cross-sectional dimensions which is adapted to be positioned within a drilled well, said piston serving to separate the cylinder into respective motor and pump chambers, means providing either a restricted or a controlled flow path which provides communication between the pump and motor chambers (i.e., between opposite sides of the piston), the induction of at least a portion of the fluid to be pumped flowing serially through the motor chamber, said restricted or controlled flow path, and thence into said pump chamber; motive fluid being subsequently applied to said motor chamber to drive said piston on an eduction stroke.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7448442 |
Pad type plunger |
Nov. 11, 2008 |
| 7314080 |
Slidable sleeve plunger |
Jan. 1, 2008 |
| 7191838 |
Method and apparatus for pumping wells with a sealing fluid displacement device |
Mar. 20, 2007 |
| 7188670 |
Plunger lift system |
Mar. 13, 2007 |
| 7040401 |
Automated plunger catcher and releaser and chemical launcher for a well tubing method and apparatus |
May. 9, 2006 |
| 7021387 |
Wellbore pump |
Apr. 4, 2006 |
| 6971856 |
Plunger for well casings and other tubulars |
Dec. 6, 2005 |
| 6746213 |
Pad plunger assembly with concave pad subassembly |
Jun. 8, 2004 |
| 6669449 |
Pad plunger assembly with one-piece locking end members |
Dec. 30, 2003 |
| 6637510 |
Wellbore mechanism for liquid and gas discharge |
Oct. 28, 2003 |
| 6554580 |
Plunger for well casings and other tubulars |
Apr. 29, 2003 |
| 6200103 |
Gas lift plunger having grooves with increased lift |
Mar. 13, 2001 |
| 6183225 |
Angled flow ports for reciprocating piston pump |
Feb. 6, 2001 |
| 6170573 |
Freely moving oil field assembly for data gathering and or producing an oil well |
Jan. 9, 2001 |
| 6148923 |
Auto-cycling plunger and method for auto-cycling plunger lift |
Nov. 21, 2000 |
| 5915475 |
Down hole well pumping apparatus and method |
Jun. 29, 1999 |
| 5868554 |
Flexible plunger apparatus for free movement in gas-producing wells |
Feb. 9, 1999 |
| 5785500 |
Well pump having a plunger in contact with well and pump fluid |
Jul. 28, 1998 |
| 5127803 |
Pump tool |
Jul. 7, 1992 |
| 4889473 |
Production plunger |
Dec. 26, 1989 |
| 4813485 |
Gas and oil well pumping or swabbing device and method |
Mar. 21, 1989 |
| 4712981 |
Pressure-operated valving for oil and gas well swabs |
Dec. 15, 1987 |
| 4696624 |
Casing pump |
Sep. 29, 1987 |
| 4664602 |
Controller for plunger lift system for oil and gas wells |
May. 12, 1987 |
| 4629004 |
Plunger lift for controlling oil and gas production |
Dec. 16, 1986 |
| 4526513 |
Method and apparatus for control of pipeline compressors |
Jul. 2, 1985 |
| 4502843 |
Valveless free plunger and system for well pumping |
Mar. 5, 1985 |
| 4465435 |
Apparatus for using natural gas pressure for pumping a well |
Aug. 14, 1984 |
| 4425083 |
Velocity actuated valve for a downhole pump |
Jan. 10, 1984 |
| 4417858 |
Plunger lift control |
Nov. 29, 1983 |
| 4410300 |
Oil well rabbit |
Oct. 18, 1983 |
| 4321015 |
Downhole, hydraulically actuated pump assembly with pressure settable packer nose assembly |
Mar. 23, 1982 |
| 4070134 |
Gas powered swabbing device |
Jan. 24, 1978 |
| 4030858 |
Multi-stage rabbit |
Jun. 21, 1977 |
| 4007784 |
Well piston and paraffin scraper construction |
Feb. 15, 1977 |
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