Method of evaluating the condition of tubular goods
AssigneeWestern Atlas International, Inc.
InventorsVernie C. McWhirter, James E. Pickett, Norman R. Carlson
Life of this patent
Estimating the term…
Abstract
A method for evaluating the extent of deterioration of pipes whereby an inspection instrument is passed through a length of casing to determine the extent of corrosive deterioration. The resulting measurements generated by the inspection instrument are processed to exclude those responses caused by the structural configuration of the casing length under inspection. The remaining responses are then analyzed to compile a detailed interpretation of the measurements including specific information regarding the state of deterioration of the length of casing under inspection.
Claims8
A method of evaluating state of deterioration due to corrosion of a string of subsurface well casing having a plurality of tubular casing lengths by passing an inspection instrument through the inside of a casing length under inspection and submitting signal outputs of said inspection instrument to a process of analysis to exclude effects of structural configuration about said casing comprising the steps of:
- deriving first and second measurements from said inspection instrument;
- combining said first and second measurements;
- analyzing said combined measurement and excluding responses caused by said structural configuration about said casing therefrom wherein the step of analyzing said combined measurement and excluding responses caused by said structural configuration about said casing therefrom further comprises the steps of:
- locating collars along said casing length under inspection;
- and
- excluding from analysis for evaluating said state of deterioration responses caused by said collars;
- and
- analyzing remaining response for evaluating said state of deterioration of said casing;
- deriving a third measurement from said inspection instruments;
- and
- comparing said third measurement to said combined measurement to determine whether casing defects are located inside or outside of the said casing.
A method of evaluating state of deterioration due to corrosion of a string of subsurface well casing having a plurality of tubular casing lengths by passing an inspection instrument through the inside of a casing length under inspection and submitting signal outputs of said inspection instrument to a process of analysis to exclude effects of structural configuration about said casing comprising the steps of:
- deriving first and second measurements from said inspection instrument;
- combining said first and second measurements;
- analyzing said combined measurement and excluding responses caused by said structural configuration about said casing therefrom wherein the step of analyzing said combined measurement and excluding responses caused by said structural configuration about said casing therefrom further comprises the steps of:
- locating collars along said casing length under inspection;
- locating centralizers along said casing length under inspection;
- and
- excluding from analysis for evaluating said state of deterioration responses caused by said collars and said centralizers;
- and
- analyzing remaining response for evaluating said state of deterioration of said casing;
- deriving a third measurement from said inspection instruments, and
- comparing said third measurement to said combined measurement to determine whether casing defects are located inside or outside of said casing.
Dependencies are inferred from the claim text.