Cavity well positioning system and method

• US 6,454,000 B1
• Filed: 10/24/2000
• Issued: 09/24/2002
• Est. Priority Date: 11/19/1999
• Status: Expired due to Fees

• Current Assignee: Effective Exploration LLC
• Original Assignee: CDX Gas LLC (EnerVest Ltd.)
• Inventors: Zupanick, Joseph A.
• Primary Examiner(s): Bagnell, David
• Assistant Examiner(s): KRECK, JOHN J
• Application Number:
  US09/696,338
• Time in Patent Office: 700 Days
• Field of Search: 166/105-112, 166/243, 166/241.1, 417/572
• US Class Current: 166/243
• CPC Class Codes: E21B 43/006 Production of coal-bed methane E21B43/243 takes precedence
• CPC Class Codes: E21B 47/09 Locating or determining the position of objects in boreholes or wells , e.g. the position of an extending arm; Identifying the free or blocked portions of pipes

Abstract

A subterranean cavity positioning system includes a down-hole device and a cavity positioning device rotatably coupled to a well portion of the down-hole device. The cavity positioning device includes a counterbalance portion operable to automatically rotate the cavity positioning device from a retracted position to an extended position as the cavity positioning device transitions from a well bore into the subterranean cavity. The counterbalance portion is also operable to align the cavity positioning device with the well bore as the down-hole device is withdrawn from the subterranean cavity.

Claims

1. A cavity well pump comprising:

a well bore portion having an inlet operable to draw well fluid from a subterranean cavity; and

a cavity positioning device rotatably coupled to the well bore portion, the cavity positioning device operable to rotate from a first position to a second position within the subterranean cavity to position the inlet at a predefined location within the subterranean cavity.

2. The cavity well pump of claim 1, wherein the cavity positioning device automatically extends from the first position to the second position as the cavity positioning device transitions from a vertical well bore to the subterranean cavity.

3. The cavity well pump of claim 2, wherein the cavity positioning device is further operable to retract from the second position to the first position as the cavity positioning device is withdrawn from the subterranean cavity.

4. The cavity well pump of claim 1, wherein the cavity positioning device comprises a first end and a second end, the cavity positioning device pivotally coupled to the well portion between the first and second ends, the cavity positioning device having a counterbalance portion disposed on the first end and operable to rotate the second end outwardly into the subterranean cavity as the cavity positioning device transitions from a vertical well bore into the subterranean cavity.

5. The cavity well pump of claim 4,wherein the counterbalance portion is further operable to align the cavity positioning device with the vertical well bore for withdrawal of the cavity positioning device from the subterranean cavity.

6. The cavity well pump of claim 1, wherein the cavity positioning device comprises a first end and a second end, the first and second ends operable to extend outwardly in substantially opposite directions to dispose the cavity positioning device in the second position, and wherein the cavity positioning device is operable to contact a portion of the subterranean cavity to position the inlet in the predefined location.

7. The cavity well pump of claim 1, wherein the cavity positioning device contacts a portion of the subterranean cavity in the second position to substantially prevent downward travel of the inlet into a sump.

8. A subterranean cavity positioning system comprising:

a down-hole device having a well portion; and

a cavity positioning device rotatably coupled to the well portion of the down-hole device, the cavity positioning device having a counterbalance portion operable to automatically rotate the cavity positioning device from a retracted position to an extended position as the cavity positioning device transitions from a well bore into the subterranean cavity.

9. The system of claim 8, wherein the counterbalance portion is further operable to automatically rotate the cavity positioning device from the extended position to the retracted position as the cavity positioning device is withdrawn from the subterranean cavity.

10. The system of claim 8, wherein the cavity positioning device comprises a first end and a second end, the counterbalance portion disposed at the first end, and wherein the second end is operable to contact a wall of the subterranean cavity to rotate the counterbalance portion into contact with the wall of the subterranean cavity to substantially prevent downward travel of the down-hole device.

11. The system of claim 8, wherein the counterbalance portion is further operable to align the cavity positioning device with the well bore as the cavity positioning device is withdrawn from the subterranean cavity.

12. The system of claim 8, wherein the down-hole device comprises a pump, and wherein the cavity positioning device is coupled to the well portion of the pump to position an inlet of the pump at a predefined location within the subterranean cavity.

13. A method for positioning down-hole equipment in a cavity, comprising:

providing a cavity positioning device coupled to a well bore portion of a down-hole device, the cavity positioning device having a counterbalance portion, the counterbalance portion causing rotation of the cavity positioning device to the extended position;

deploying the down-hole device and the cavity positioning device into a well bore, the cavity positioning device disposed in a retracted position relative to the well bore;

running the down-hole device and the cavity positioning device downwardly within the well bore to the cavity, the cavity positioning device automatically rotating to an extended position relative to the well bore in the cavity; and

positioning the down-hole device at a predefined location in the cavity by contacting a portion of the cavity with the rotated cavity positioning device.

14. A method for positioning down-hole equipment in a cavity, comprising:

providing a cavity positioning device coupled to a well bore portion of a down-hole device;

deploying the down-hole device and the cavity positioning device into a well bore, the cavity positioning device disposed in a retracted position relative to the well bore;

running the down-hole device and the cavity positioning device downwardly within the well bore to the cavity, the cavity positioning device automatically rotating to an extended position relative to the well bore in the cavity;

positioning the down-hole device at a predefined location in the cavity by contacting a portion of the cavity with the rotated cavity positioning device;

releasing contact between the cavity positioning device and the portion of the cavity, releasing contact automatically transitioning the cavity positioning device from the extended position to the retracted position; and

withdrawing the down-hole device and the cavity positioning device from the cavity and the well bore.

15. The method of claim 14 wherein automatically transitioning to the retracted position comprises automatically rotating the cavity positioning device from the extended position to the retracted position.

16. The method of claim 14, wherein automatically transitioning further comprises aligning the cavity positioning tool within the well bore.