Journal of Petroleum Technology June 2012 : Page 24
TECHNOLOGY APPLICATIONS Fig. 2—The 12-t 48-in. SmartPlug pipeline-pressure-isolation tool designed by TDW Offshore Services for Nord Stream. Fig. 3—The WesternGeco ObliQ technique deghosts data acquired with a variable streamer depth. es the penetration depth of seismic imaging and helps geoscientists extract rock properties from seismic data. Opti-mized seismic bandwidth is achieved by combining variable-streamer-depth acquisition with a proprietary deghost-ing methodology (Fig. 3) and a newly developed broadband-seismic source. This proprietary processing is applied early in the sequence, making the data suitable for both time-and depth-domain analysis. Enabled by the com-pany’s Q-Marine point-receiver marine-seismic system, the technique can be used with other technologies such as Coil Shooting and Dual-Coil Shooting full-azimuth acquisition to combine broad bandwidth with full-azimuth, long-offset acquisition. This combina-tion is particularly important for imag-ing below complex structures such as subsalt and subbasalt. ◗ For additional information, visit www.slb.com/obliq. Multinode Vibration Monitoring The OTS International DataPlug (Fig. 4) is a patent-pending indepen-dent vibration-monitoring tool for use in downhole components. With a high-temperature battery, large memory, and triggering thresholds, it can record mul-tiple axis-vibration types. In V-mode, it can be installed in most downhole components by machining a thread-ed receptacle for the sensor, includ-ing expandable or eccentric reamers, motors, stabilizers, hole openers, mill-ing tools, dog subs, and drill bits. The vibrations are recorded at the source, providing discrete, local vibration data relative to the tool. It enables qualify-ing vibrations relative to their occur-rence in the drillstring. This device provides better incident investigation, improved tool selection, and consistent field performance from downhole tools. Analyzing the data enables identifying vibration sources. The degree of damp-ening or amplification between vibra-tion nodes can be determined relative to tool performance. By deploying multiple de vices in V-mode, software models can be fine tuned with real multinode data, enabling accurate predictions of bot-tomhole-assembly behavior. Data are stored on the basis of threshold values programmed into the sensor with a time stamp, which can be correlated with rig operational data. Data are retrieved by reading through a universal-serial-bus port upon reaching the surface. Upgrades will read data as the tools pass through the rotary table. ◗ For additional information, email info@otsintl.com. Fracturing Sliding Sleeve Weatherford’s MASS fracturing-treat-ment sliding sleeve (Fig. 5) enables treatment of more than 50 zones in a single job, enhancing the efficiency of multizone fracture-stimulation oper-ations. The technology is based on a multi array stimulation system. The sys-tem groups up to five sleeves per stage, and the array is opened with a single ball. This design will enable fracturing of up to 10 stages in a single trip. The sliding sleeve opens when a ball lands on the seat and applied tubing pressure shears the sleeve open. The ball passes through the ball seat and on to the next Fig. 4—The OTS DataPlug can record multiple axis-vibration types. The bullet shaped DataPlug is for pressure and temperature (PT-Mode); the squared-off end is the V-Mode. These plugs will fit into a drill-bit port. 24 JPT • JUNE 2012
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