Tubing tester

• US 4,122,898 A
• Filed: 02/25/1977
• Issued: 10/31/1978
• Est. Priority Date: 02/25/1977
• Status: Expired due to Term

• Current Assignee: Dowell Schlumberger Incorporated (Schlumberger NV)
• Original Assignee: The Dow Chemical Company (Dow, Inc.)
• Inventors: Nelson, Wayne F.
• Primary Examiner(s): Purser, Ernest R.
• Assistant Examiner(s): Pate, III, William F.
• Application Number:
  US05/772,198
• Time in Patent Office: 613 Days
• Field of Search: 166/325, 166/330, 166/332, 166/334, 175/241, 175/242
• US Class Current: 166/325
• CPC Class Codes: E21B 2200/05 Flapper valves
• CPC Class Codes: E21B 23/006 "J-slot" systems, i.e. lug and slot indexing mechanisms
• CPC Class Codes: E21B 34/06 in wells
• CPC Class Codes: E21B 34/12 operated by movement of casings or tubings
• CPC Class Codes: E21B 47/117 Detecting leaks, e.g. from tubing, by pressure testing

Abstract

The invention is an elongated valved device adapted to be coupled between a string of tubing and a well bore packer.

An outer sleeve is coupled at one end to the tubing and has a movable hollow mandrel into the other end of the outer sleeve. Advancing or retracting of the mandrel is afforded by rotating the mandrel to engage grooves in the periphery of the mandrel with lugs at the end of the outer sleeve, then moving the mandrel axially with respect to the outer sleeve.

An inner sleeve is locked in position within the outer sleeve and has a spring loaded flapper valve assembly at its end facing the end of the mandrel.

Advancement of the mandrel forces its end (curved) through the valve assembly.

Claims

1. Tubing tester apparatus comprising:

(a) an elongated generally cylindrical outer sleeve having inner and outer side walls, and upper and lower ends, means adjacent to said upper end for coupling a connector member, lug means adjacent to said lower end for receiving a J-slot of an axially movable mandrel;

(b) an elongated mandrel having a rounded upper end part, a cylindrical middle part dimensioned to fit closely but slidably against the inner side wall of said outer sleeve, said mandrel having a generally axially disposed elongated grooved lower part adapted to move between said lugs in said outer sleeve, and a lower end part adapted to receive a coupling member;

(c) an inner sleeve having inner and outer side walls, an upper end part and a lower end part, said lower end containing a flapper valve assembly disposed across said lower end part, said valve assembly including a valve seat structure having an axial aperture larger than the rounded upper end part of said mandrel and in axial alignment therewith and a spring loaded flapper having a double ended pivot part at one side, said pivot part being disposed in a transversely disposed grooved part of said lower end part, said spring loading including a spring coiled around said pivot of said flapper, said spring having one end bearing against the top of said flapper and a second end extending towards the top of said valve seat structure, said side walls having a cut out part adjacent to said flapper whereby when said flapper is fully open it partially fits into said cut out part, said outer sleeve having a shoulder along its inner wall against which said lower end of said inner sleeve abuts;

(d) a connector member, said connector member being coupled to said outer sleeve and having an end which abuts against said inner sleeve, and

(e) a coupling member coupled to the lower end part of said mandrel and abutting against said grooved part.

2. Apparatus in accordance with claim 1, wherein a key slot is disposed in said inner side wall of said outer sleeve and a key element in said outer side wall of said inner sleeve is partially disposed in said key slot.

3. Apparatus in accordance with claim 2, wherein said key element is spring loaded.

4. Apparatus in accordance with claim 2, wherein said rounded upper end part of said mandrel has slots extending between said inner and outer side walls.

5. Apparatus in accordance with claim 1, wherein seals are provided between said mandrel and said outer sleeve and between said inner sleeve and said outer sleeve.

6. Apparatus in accordance with claim 1, wherein the most forward extending part of said mandrel is aligned with the part of said flapper which is remote from said pivot.