Tubing plug apparatus for performing down-hole pressure tests

Patent · Tue Sep 06 04:00:00 EDT 1977

OSTI ID:5255620

Dufrene, A

A tubing pressure test apparatus which comprises an elongate hollow body is disclosed. A fishing neck on a sliding mandrel carrying a check valve on the bottom end is received an upper outer hollow mandrel which has an internal valve seat. Fluid communication from the exterior of the mandrel to an internal passage is controlled by the check valve on the upper mandrel. The check valve is received in the seat below lateral passages to the exterior. The axial internal passage communicates through the bottom of the tool to enable the tool to be pulled upwardly in the tubing string through a column of liquid. The upper outer mandrel is threaded to a central pipe which supports an expandable resilient element. The pipe is slidably connected to an outer lower mandrel which has a taper which forces the expandable element radially outwardly when a compressive force is applied to the top of the tool. The lower end of the tool carries a collar locator which includes a pair of spring located radially outwardly directed contoured fingers which resiliently deflect outwardly in order to latch into a collar. At this juncture, sinker bars bearing on the top of the tool in the running string cause it to compress, thereby expanding the resilient element and closing the fluid path through the tool. This enables a pressure test to be run above the tool. The tool is then pulled upwardly to anotherelevation to run a subsequent test.

• Assignee: TIC; ERA-03-016646; EDB-78-035381
• Patent Number(s): US 4046006
• OSTI ID: 5255620
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
LEAK TESTING
OIL WELLS
PRESSURIZING
TESTING
TOOLS
WELLS