Accelerator for fishing jar with hydrostatic assist

Patent · Tue Jul 04 04:00:00 EDT 1989

OSTI ID:5454496

Evans, R W

This patent describes an accelerator for a jar. It comprises: an outer housing; a mandrel telescopingly arranged with the outer housing; first sealing mans disposed between the mandrel and the outer housing for forming a compression chamber for containing a compressible fluid; means disposed between the mandrel and the outer housing and within the compression chamber formed by the first sealing means for compressing such a compressible fluid in response to movement of the mandrel; means for preventing such a compressible fluid from flowing from the compression chamber during compression of the compressible fluid; second sealing means disposed between the mandrel and outer housing and longitudinally displaced from the first sealing means for forming a chamber which isolates the first sealing means and any compressible fluid from the well fluid pressure; means for enabling any such compressible fluid to expand in response to an increase in temperature; and means in longitudinal and series displacement from the first sealing means and second sealing means for engaging the accelerator to a drill string; the second sealing means which isolates the first sealing means and any compressible fluid from the well fluid pressure forming a rear chamber; a floating piston, having upper and lower sides the accelerator further including: means for permitting passage of fluid from the compression chamber into the rear chamber.

• Assignee: Daily Petroleum Services, Corp., Conroe, TX
• Patent Number(s): US 4844183
• Application Number: PPN: US 7-114560A
• OSTI ID: 5454496
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
024000* -- Petroleum-- Storage-- (-1989)
COMPRESSIBLE FLOW
CONTAINERS
ENERGY SOURCES
FLUID FLOW
FOSSIL FUELS
FUELS
HYDROSTATICS
PETROLEUM
SEALS
STORAGE
STORAGE FACILITIES