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US 2021/0341552 A1Published application
Magnetic freepoint indicator tool
AssigneeBaker Hughes Oilfield Operations LLC
InventorsJames David Ratcliffe, Andrew Smith, Jim Andrew Gulliver, Sushant Dutta
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Abstract
A system for determining a stuck point of a pipe positioned within a wellbore includes a tubular housing and a sensor array positioned within the tubular housing. The system also includes ferromagnetic flux collectors and flux concentrators on either side of the sensor array. The flux collectors collect a magnetic flux that has been written to a portion of pipe. The flux concentrators intensify the flux to improve measurements of the flux that are acquired by the sensor array.
Claims21
A system for determining a stuck point of a pipe positioned within a wellbore, comprising:
- a tubular housing having a first end and a second end;
- a first ferromagnetic collector positioned within the tubular housing at a first end and having an outer profile shape on its ends;
- a second ferromagnetic collector positioned within the tubular housing at a second end and having the outer profile shape on its ends;
- a first flux concentrator positioned between the first ferromagnetic collector and the second ferromagnetic collector, and having an outer end of the profile shape and adjacent to the first ferromagnetic collector, and having an inner end of an inner profile shape, the inner profile shape smaller than the outer profile shape;
- a second ferromagnetic concentrator positioned between the second ferromagnetic collector and the first flux concentrator having an outer end of the outer profile shape and adjacent to the second ferromagnetic collector, and an inner end of the inner profile shape;
- and
- a sensor array positioned axially to the tubular housing and between the first flux concentrator and the second flux concentrator, wherein the sensor array is smaller than the inner profile shape;
- wherein the first ferromagnetic collector and the second ferromagnetic collector attract a magnetic field, wherein the first flux concentrator and the second flux concentrator concentrate the magnetic field, and wherein the sensor array measures the concentrated magnetic field.
5 more elements
A system, comprising:
- a drilling rig, the drilling rig installing one or more sections of pipe into a wellbore formed in a downhole formation;
- a stuck section of pipe, of the one or more sections of pipe, the stuck section of pipe being positioned in the wellbore and having a free end, a stuck end, and a stuck point between the free end and the stuck end;
- and
- a magnetic freepoint indicator tool (MFIT), comprising:
- a first ferromagnetic collector positioned within the MFIT at a first end and having an outer profile shape on its ends;
- a second ferromagnetic collector positioned within the MFIT at a second end and having the outer profile shape on its ends;
- a first flux concentrator positioned between the first ferromagnetic collector and the second ferromagnetic collector, and having an outer end of the profile shape and adjacent to the first ferromagnetic collector, and having an inner end of an inner profile shape, the inner profile shape smaller than the outer profile shape;
- a second ferromagnetic concentrator positioned between the second ferromagnetic collector and the first flux concentrator having an outer end of the outer profile shape and adjacent to the second ferromagnetic collector, and an inner end of the inner profile shape;
- and
- a sensor array positioned axially to the MFIT and between the first flux concentrator and the second flux concentrator, wherein the sensor array is smaller than the inner profile shape;
- wherein the first ferromagnetic collector and the second ferromagnetic collector attract a magnetic field, wherein the first flux concentrator and the second flux concentrator concentrate the magnetic field, and wherein the sensor array measures the concentrated magnetic field to identify the stuck point.
8 more elements
A method for identifying a stuck point of a pipe arranged in a wellbore, comprising:
- acquiring a first magnetic flux by a sensor array, the sensor array positioned between two flux concentrators, wherein the two flux concentrators are positioned between two ferromagnetic collectors;
- acquiring a second magnetic flux by the sensor array;
- and
- determining a difference between the first magnetic flux and the second magnetic.
1 more element
Dependencies are inferred from the claim text.