Central pipe and sleeve damage monitoring method

Abstract

The invention provides a central tube and casing damage monitoring method, which is characterized in that measurement is carried out in a pulsed neutron oxygen activation logging mode, the physical basis of pulsed neutron oxygen activation logging is that pulsed neutrons and oxygen elements interact with each other, activated oxygen atoms emit characteristic gamma rays, and the characteristic gamma rays are used for monitoring the damage of a central tube and a casing. The flow condition of the oxygen-containing fluid around the instrument is determined by detecting gamma rays, and the flow condition of the oxygen-containing fluid around the instrument is determined by detecting gamma rays excited by reaction of fast neutrons emitted by a neutron source of the instrument and oxygen atoms in the fluid. The excited gamma rays penetrate through fluid and a central pipe due to high energy, the water flow velocity is measured, the water flow velocity is obtained at the bottom edge time of a complete peak position on a time spectrum, and the damage condition of the inner wall of the casing pipe is detected and measured through multiple measuring arms in multi-arm hole diameter logging.

Description

technical field [0001] The invention relates to the field of damage monitoring, in particular to a damage monitoring method for a central pipe and a casing. Background technique [0002] Although the electromagnetic flaw detection logging technology can detect the damage of each layer of the multi-layer pipe string, the detection of the single-layer pipe string is more accurate; this technology can quantitatively explain the damage of the pipe string by calculating the thickness of the pipe wall, but the thickness The change is the average value of the inner and outer walls of the casing for one week, and it is difficult to reflect the local damage. Therefore, if the well conditions permit, it can be combined with the multi-arm well diameter that can detect the damage of the inner wall of the pipe string to identify the damage of the inner and outer walls of the single-layer pipe string and the damage of the center pipe or casing of the double-layer pipe string. Combined wi...

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Problems solved by technology

[0002] Although the electromagnetic flaw detection logging technology can detect the damage of each layer of the multi-layer pipe string, the detection of the single-layer pipe string is more accurate; this technology Quantitatively explain the damage of the pipe string by calculating the pipe wall thickness, but the change of the thickness is the average value of the inner and outer walls of the casing for a week, and it is difficult to reflect the local damage

Therefore, if the well condition permits, it can be combined with the multi-arm caliper that can detect the damage of the inner wall of the pipe string to identify the damage of the inner and outer walls of the single-layer pipe string and the damage of the center pipe or casing of the double-layer pipe string. Combined with the specific conditions of alkali wells, due to serious scaling and deformation of pipe strings in alkali wells, it is very easy to cause jamming of multi-arm well diameters. Therefore, we have improved this and proposed a damage monitoring method for central pipe and casing

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