Casing Integrity Evaluation - BGES · various forms of metal loss in the casing, including cracks and holes. It displays accurately the downhole pipe string, tool location, and can

Corrosion or other forms of mechanical damages are commonly seen in cased wells. Corrosion is caused by equipment-induced or natural electrical currents that flow in the earth. It may result in holes or loss of metal in the casing/tubing, thus weakening the structural integrity of the wellbore. Casing damages may occur during testing, drilling of plugs, or well stimulation. Compromised casing integrity can have a severe impact on production and the environment. BGES’ Casing Integrity Evaluation services are offered to provide extensive corrosion inspection in production, injection and disposal wells. This category of service is most useful when combined with the RCBL for a full evaluation of casing and cement integrity.

Appl ica t ions Detect metal loss in casing of production, injection and disposal wells

Features & Benef i ts This logging suite is a combination of electromagnetic log, multi-finger imaging caliper and gyro inclinometer to effectively evaluate metal loss and changes in casing geometry.

Operat ion Multiple conveyance methods are available. The services can be combined with the RCBL for a full evaluation of casing and cement integrity.

Casing Integrity Evaluation

Specifications

Tool

Length—Active 2.5m

Diameter 43 mm

Borehole Max. Temperature 175⁰C

Max. Pressure 100 MPa

Min. Hole Diameter 533 mm

Max. Hole Diameter 114.3 mm

Measurement

Range (length) 70 mm — 324 mm

Range (wall thickness) 3—12 mm (single layer) ≤ 25 mm (double layer)

Accuracy ± 0.5 mm (single layer) ± 1.5 mm (double layer)

Min. Length of Axial Crack 40 mm (2.5” single layer) 60 mm (5.5” single layer) 130 mm (5.5” double layer)

Min. size of Circum. Crack 1/6 of Diameter Min. Dia. of hole defect 25 mm

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The Electro-magnetic Defect Detection tool is designed to measure wall thickness and detect various forms of metal loss in the casing, including cracks and holes. It displays accurately the downhole pipe string, tool location, and can detect magnetic material outside casing (such as casing centralizer, surface casing, etc.).

Corrosion Evaluation Tool

Crack at 84m and fracture at 92m 

B i g G u n s E n e r g y S e r v i c e s

The multi-finger imaging caliper can detect casing deformation, bending, fracture, holes and inner wall corrosion using individual measuring fingers. Displacement of each finger is reflected to its sensor directly and all the displacement signals are processed, coded, and transferred to surface system where a 3D image of the casing can be generated.

The caliper is available in three sizes to fit different casing diameters: 24 fingers, 40 fingers and 60 fingers

Multi -Finger Imaging Cal iper

The gyro inclinometer is an effective way to measure the trajectory, azimuth, inclination and tool face angle of cased wells. The instrument is designed based on inertial navigation technology in the aviation field. Its core sensor consists of a specialized gyroscope and a silicon flexural accelerometer protected by an anti-shock design. The use of a gyroscope makes it not susceptible to interference from external magnetic field.

This instrument uses a combination of high-precision sensors, a micro-processing system and high-performance DSP+FPGA control frame to substantially improve measurement accuracy.

Gyro Incl inometer

Specifications

Tool

Length—Active 1.42m / 1.36m / 1.44m Diameter 43 mm / 70 mm / 100 mm Number of Fingers 24 / 40 / 60

Borehole

Max. Temperature 175⁰C

Hole Diameter ≤ 5.5” / 4”—7” / 5.5”—10¾”

Measure

Range 45—150 mm / 80—180 mm / 110—254mm

Accuracy ± 1 mm

New centralizer design 

Caliper images 

Specifications

Borehole

Max. Temperature 175⁰C (for 4 hours)

Max. Pressure 140 MPa

Measurement

Angle Range 0—90⁰ Accuracy ± 0.1⁰

Azimuth Range 0—360⁰ Accuracy ± 2⁰  (azimuth≥3⁰) 

Tool Face Orientation

Range 0—360⁰ Accuracy ± 2⁰

Gyro inclinom

eter plot