The productive life of an oil well can be reduced by the condition of the well itself. Deterioration of the casing or tubing can be caused by corrosion, unintentional damage during drilling and intervention or formation movement. Scale build-up can also reduce production. Remedial work can be minimised with exact knowledge of a well's condition. The operator can receive early warning of a potential problem and obtain data for determining a specific restoration programme by running the casing inspection suite.
Measurements from multifinger calipers and magnetic tools determine the condition of the casing or tubing within a well.
Ultralink™ System
Multifinger Imaging System (MIT)
The Sondex Multifinger Imaging System (MIT), comprising downhole tools, surface equipment and software, provides high resolution detail on the condition of downhole tubulars. The downhole Multifinger Imaging Tool has an array of hard surfaced fingers which measure very small changes in diameter. A range of tool sizes with 24, 40, or 60 fingers are available to suit different casing diameters. Tool deployment can be via slickline, electric line, coiled tubing or downhole tractors. In surface readout mode, a digital surface panel supplies power to the toolstring and decodes the telemetry signals received. In memory mode, a PC and memory interface unit are required.
Multifinger Imaging Tool (MIT 24 finger)
Multifinger Imaging Tool (MIT 40 finger)
Multifinger Imaging Tool (MIT 60 finger)
Metal Thickness Tools
The Magnetic Thickness Tool (MTT) uses 12 miniature magnetic sensors, mounted on the inside of a set of bowsprings, to investigate variations of metal thickness within downhole tubulars. Thickness data from MTT may be combined with MIT data using WIVA software to produce powerful 3D images. Statistical reports from MTT data are available using WIPER software.
Magnetic Thickness Tool (MTT)
Well Integrity Visual Analysis, WIVA
By combining information from the MIT and MTT, images can be created on a computer screen in 3 dimensions. Colour schemes, meshes, arrows and numerical data can be added to help an engineer understand the structure and condition of their well. In particular, the dimensions and type of completion can be shown together with the location and magnitude of any damage. WIVA can also be used to display MIT and MTT data independently.
Well Integrity Visual Analysis (WIVA)
Well Integrity Processing, Evaluation & Reporting, WIPER
Data from the MIT and MTT can be automatically processed to identify certain features in the well; most obviously the collars. After setting some parameters, the software carries out a joint by joint statistical analysis and builds a report summarising the condition of the pipe in the well. Reports from subsequent logs on the same well may be compared to see how the pipe condition is changing over time and allow the prevention of failure.
Well Integrity Processing, Evaluation & Reporting (WIPER)
Telemetry and Memory
Ultralink to Ultrawire Crossover (XTU)
Memory Production Tool (MPL)
Ultrawire Memory Tool (UMT)
MIT Tool Maintenance
A memory MIT Simulator (MMS) is used during servicing or testing. It is used with the MIT section only and can issue commands to the MIT without the need for a memory section or battery. MIT calibration jigs are used to calibrate the tool fingers prior to an MIT job.
