E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 23/00 (2006.01) E21B 23/06 (2006.01) E21B 47/09 (2006.01)
Patent
CA 2170711
An electrically powered locator and setting tool is described which is capable of locating and then setting a barrier member within a cased wellbore or other string of tubular members in a manner such that the barrier member will not be set at a casing joint. The locator and setting tool preferably features a single tool arrangement containing a casing collar locator and a packer setting assembly. The casing collar locator includes a detection means which detects the actual locations of casing collars along the casing string. The locator then provides a signal indicative of these locations. The setting tool includes a motor and an associated linear drive section which will operate an attached retrievable packer assembly to set the packer assembly at a desired point in the wellbore. A remote power source, usually located at the surface of the wellbore, supplies electrical energy to the locator and setting tool through an electrically conductive power line which can be extended down through the wellbore. Because the locator and setting tool is preferably run into a wellbore by wireline, the power line is typically disposed along or within the wireline running arrangement. In methods of operation described herein, a planned setting point within a cased wellbore is established based upon recorded well logs and customer requirements. The planned setting point is established at a point in the casing string where no joint is recorded. A packer assembly is disposed into a wellbore using the locator and setting tool to a point proximate the planned setting point according to physical measurement of the running arrangement via manipulation of the locations of casing collars around the planned setting point are detected by the casing collar locator. The detected depths of the casing collars are then compared to the recorded collar depths if the detected and recorded depths match, the packer assembly may be set at the planned setting point. If there is a discrepancy between the detected and recorded collar depths, the customer can be informed and warned that setting the packer at the planned setting point may result in setting at a joint. The adjusted setting point is located in a portion of the wellbore where no casing joint is located which could prevent the barrier member from establishing or maintaining a fluid seal when set. According to the methods herein described, the locator and setting tool is removably affixed to a retrievable packer assembly. The "offset distance," the approximate longitudinal distance from the casing collar locator's detection means and the sealing member of the packer assembly, is measured. A running arrangement and a power line are attached to the locator and setting tool. Once the setting point has been adjusted and verified as described, the locator and setting tool and affixed packer assembly are disposed within the wellbore to the depth of the adjusted setting point. The packer assembly may then be set inside the wellbore by operation of the packer setting assembly .
Clemens Jack G.
Cobb Charles C.
Gazda Imre I.
Goiffon John J.
Clemens Jack G.
Cobb Charles C.
Company Halliburton
Gazda Imre I.
Goiffon John J.
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