Downhole electro-hydraulic vertical shear wave seismic source

Cole, J H

Title: Downhole electro-hydraulic vertical shear wave seismic source

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Abstract

A downhole electro-hydraulic vertical shear wave seismic source to be lowered into a wellbore is described comprising: a source cylindrical housing; a reaction mass means for generating seismic shear waves, said reaction mass means having an actuator with an actuator piston and actuator cylinder and located internal to said source cylindrical housing to isolate said actuator from wellbore fluid and pressure, said reaction mass including transversely formed holes through which hydraulic cylinders connected to contact pads pass, said holes having a significantly larger diameter than said hydraulic cylinders; a clamping means to clamp said source cylindrical housing to the wellbore, said clamping means including two serrated pads radiused to match an inside diameter of casing located in said wellbore and hydraulic cylinders having internal compact stacks of spring washers for retraction for actuating said serrated pads; a compact and soft urethane spring for suspending said reaction mass; and a threaded guide rod passing vertically through said urethane spring to allow spring compression to be adjusted until said actuator piston is precisely centered with no differential hydraulic pressure across said actuator piston.

Inventors:: Cole, J H

Publication Date:: Tue Jul 20 00:00:00 EDT 1993

OSTI Identifier:: 6340658

Patent Number(s):: US 5229554; A

Application Number:: PPN: US 7-815662

Assignee:: Conoco Inc., Ponca City, OK (United States)

Resource Type:: Patent

Resource Relation:: Patent File Date: 31 Dec 1991

Country of Publication:: United States

Language:: English

Subject:: 47 OTHER INSTRUMENTATION; 58 GEOSCIENCES; GEOLOGIC FORMATIONS; SEISMIC SURVEYS; SEISMIC SOURCES; DESIGN; ACTUATORS; BOREHOLES; OPERATION; PISTONS; SEISMIC S WAVES; SPRINGS; CAVITIES; GEOPHYSICAL SURVEYS; MACHINE PARTS; SEISMIC WAVES; SURVEYS; 440400* - Well Logging Instrumentation; 580000 - Geosciences

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                    Cole, J H. Downhole electro-hydraulic vertical shear wave seismic source.  United States: N. p., 1993. 
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                    Cole, J H. Downhole electro-hydraulic vertical shear wave seismic source.  United States.

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                    Cole, J H. 1993.  
        "Downhole electro-hydraulic vertical shear wave seismic source".  United States.

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@article{osti_6340658,

  title        = {Downhole electro-hydraulic vertical shear wave seismic source},

  author       = {Cole, J H},

  abstractNote = {A downhole electro-hydraulic vertical shear wave seismic source to be lowered into a wellbore is described comprising: a source cylindrical housing; a reaction mass means for generating seismic shear waves, said reaction mass means having an actuator with an actuator piston and actuator cylinder and located internal to said source cylindrical housing to isolate said actuator from wellbore fluid and pressure, said reaction mass including transversely formed holes through which hydraulic cylinders connected to contact pads pass, said holes having a significantly larger diameter than said hydraulic cylinders; a clamping means to clamp said source cylindrical housing to the wellbore, said clamping means including two serrated pads radiused to match an inside diameter of casing located in said wellbore and hydraulic cylinders having internal compact stacks of spring washers for retraction for actuating said serrated pads; a compact and soft urethane spring for suspending said reaction mass; and a threaded guide rod passing vertically through said urethane spring to allow spring compression to be adjusted until said actuator piston is precisely centered with no differential hydraulic pressure across said actuator piston.},

  doi          = {},

  url          = {https://www.osti.gov/biblio/6340658},
  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {Tue Jul 20 00:00:00 EDT 1993},

  month        = {Tue Jul 20 00:00:00 EDT 1993}

}

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https://doi.org/10.2172/469180

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