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Magnetic Thickness Detector (MTD) 
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SITAN DTS series Magnetic Thickness Detector (MTD) is used to detect the casing thickness, corrosion, deformation, cracks etc. in the oil tubing, indicating downhole tubular structure, tool location and detecting the ferromagnetic material (such as casing centralizers, surface casing, etc.) outside casing.
Due to the unique structure and measurement principle, SITAN DTS series Magnetic Thickness Detector can finish the logging tasks during normal production of oil and water wells, reducing operating cost in inspection and increasing efficiency, can timely judge the structural damage of cased wells.
Applications
(1) SITAN MTD can identify crack-type defects (longitudinal and transversal joint), crack defects, pipe wall corrosion, mechanical wear section, explosion perforation section and the disjoint of sieve tube and collar.
(2) Double column testing.
(3) SITAN MTD can log the position of all collars of double column, getting the complete location image of all pipes along the well direction, and the location of casing shoe, packer and valve.
(4) SITAN MTD can make logging without oil production stopping. The paraffin and cement block have no effect on the logging.
(5) SITAN MTD can match with other casing logging instruments such as multi-finger imaging tool(MIT) , the combined results can reflect and explain the well condition.
Features
(1) Full function: The defects and thickness of oil tube and casing, temperature and nature gamma parameters, etc. can be measured in just one downhole trip.
(2) Easy maintenance: simple mechanical structure, easy disassembly and easy maintenance.
(3) Various operating modes: cascade connection, connection with multi-finger caliper(MFC), etc. or independent operating.
Technical specifications
Maximum
temperature 177℃ Maximum pressure 103.4MPa（15000psi） Tool OD 43mm（1.69in） Tool length 2300mm Tool weight 10Kgs Operating voltage (90±8) VDC/18VDC Operating currency (135±5)mA/(550±50)mA Maximum logging
speed 400m/h Measuring range of pipe diameter (62～324)mm（2.44in~12.75 in） Measuring range of single pipe thickness (3～12)mm（0.11in~12.75 in） Total maximum thickness of double pipes 25 mm（0.98in） Measuring error of single pipe thickness 0.5mm（0.019in） Measuring error of casing through tubing 1.5mm（0.059in） Minimum length of
longitudinal damage 50mm（1.96in） 2.5in single pipe 70mm（2.75in）5.5in single pipe 150mm（5.90in.）5.5in casing through tubing Minimum length of
transversal damage 1/4 circumference Minimum diameter
hole damage 30mm（1.18in） Measuring range of
Gamma （0～2000）cps Gamma sensitivity 1cps Measuring range of
temperature -40℃～177℃ Temperature
resolution 0.1℃ Temperature
accuracy 1℃ Housing material TC4
Case study
MFC imaging
instrument connected with the EMDS (Shaanbeihua 297-2)
Casing collar
damage at 1579m, different material above and below casing collar at 1589m.
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