is designed for detailed casing string conditions survey, defects form and size identification; cumulative and drilling perforation holes detection, wall thickness determination within certain sectors.

Description

Features and Advantages

• casing small defects identification (longitudinal cracks and cross cracks and holes);
• identification of local reductions in casing wall thickness within corrosion sectors and mechanical wear zones (including key seats);
• cumulative and drilling perforation holes detection.

Specifications

Casing pipe size, mm

140-168

Wall thickness measurements range, mm

3-12

Wall thickness measurements relative error (full-circle averaged), %

10

Wall thickness measurements relative error for every sector, %

20

Defects minimal length (cracks), mm

30

Defects minimal size (holes), mm

9

Minimal spacing between perforation holes, mm

100

Max. hydrostatic pressure, MPa

60

Max. operating temperature, °C

100

Cable

one-core cable

Tool dimensions, mm:

surface panel

downhole tool diameter

downhole tool length

 

290×260×150

102, 112

3100

Results

1. Local defects emision. According to EMDS-S data interpretation more than 20 local defects- corrosion pits 0.9-13 cm3 in volume are revealed in injection point № 529 with the interval of 1060-1350 m.  

 

2. Perforation holes emision. Monitor well NPF “Geophizika”. EMDS-S defectoscope clear fixates all 21 holes, which were drilled by PS-112 perforator. All the holes are drilled on the one side of the column, that’s why it is fixated only by one sonde of small defects.

 

3. Areal corrosion spotting of EMDS-S. The defectoscope log indicates two areas of intensive corrosion attack in the casing. These areas are characterized by many local anomalies of local defects curves and by areas of wall thickness reduction at the separate sectors. The flowmeter log indicates water leaking from the   cracks in these areas.

Certificate