Crack at 84m and fracture at 92m 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. Corrosion Evaluation Tool 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.). Specifications 2.5m Diameter 43 mm Max. Temperature 175⁰C Max. Pressure 100 MPa Min. Hole Diameter 533 mm Detect metal loss in casing of production, injection and disposal wells Max. Hole Diameter 114.3 mm Range (length) 70 mm — 324 mm Features & Benefits 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 Operation Multiple conveyance methods are available. The services can be combined with the RCBL for a full evaluation of casing and cement integrity. Measurement 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. Borehole A p p l i c a t i on s Tool Length—Active Cased-hole Logging C a s i n g In t e g r i t y E v a l u a ti o n Multi-Finger Imaging Caliper Gyro Inclinometer 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 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. The caliper is available in three sizes to fit different casing diameters: 24 fingers, 40 fingers and 60 fingers Specifications 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 cen tr alize r des ig Specifications Max. Temperature 175⁰C (for 4 hours) Max. Pressure 140 MPa Angle Range 0—90⁰ Accuracy ± 0.1⁰ Range 0—360⁰ Accuracy ± 2⁰ (azimuth≥3⁰) Range 0—360⁰ Accuracy ± 2⁰ Azimuth Tool Face Orientation n Big Guns Energy Services Gyro inclinometer plot 43 mm / 70 mm / 100 mm Measurement Diameter This instrument uses a combination of highprecision sensors, a micro-processing system and high-performance DSP+FPGA control frame to substantially improve measurement accuracy. Borehole 1.42m / 1.36m / 1.44m Tool Length—Active Caliper images