Tags: Drilling

The Importance of Drilling Automation

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Automation and robotics are currently the topics of interest to oil companies when it comes to well construction; they are focusing on efficiency and drilling innovation that will reduce well costs. When looking at the market segment for drill ships, the spread costs per minute during drilling operations can run over US$500. Every saved minute […]

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Advanced Displacement System Completion Fluid

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The TETRA Advanced Displacement System – TADS™ fluid blend allows for the balanced displacement of synthetic (SBM) and oil-based (OBM) drilling fluids. The fluid blend system was developed in an eff ort to meet demands for more eff icient and environmentally responsible drilling fluid for completion brine displacements. Typical deepwater displacements of SBM use a […]

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High Density, Non-Zinc Completion Fluid

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TETRA CS Neptune® completion fluid is a high-density completion fluid free of solids, zinc and formates. The completion fluid was specifically developed for deepwater and complex high-pressure wells that require high-density clear brine solutions to control well pressure during the completion phase. The fluid addresses the environmental challenges facing offshore oil producers seeking an alternative […]

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Varel’s TRIFORCE™ Focused Force PDC Cutters

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TRIFORCE shaped cutters apply force in a very different way to the concave geometry. Instead of shearing, the ridged cutter profile focuses force on a very small leading edge to fracture and plough through the rock. The ploughing action presents a positive trade off . While it requires a slightly greater force than concave and […]

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Effective Back Rake PDC Cutters

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Concave SCOOP cutters eliminate the fixed link between relief angle and back rake angle. While the cutter’s relief angle is fixed, its concave geometry produces an eff ective back rake that varies depending on the DOC. The radius of the concave surface describes this changing back rake angle relative to the point at which the […]

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Back Rake Angles of Attack PDC Cutters

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PDC cutters are mounted on the bit body at a fixed relief angle. This angle determines the angle at which the cutter face engages the formation. The angles are typically the same: a 20˚ relief angle yields a 20˚ back rake. Back rake angle is specified at manufacture to achieve specific performance characteristics. A lower […]

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PDC Cutters Three-Dimensional Geometry

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PDC Cutters Three-Dimensional Geometry

Conventional planar cutters consist of a flat, two-dimensional diamond table supported by a tungsten carbide substrate. In contrast, shaped cutter diamond tables have three-dimensional eometry. Varel’s concave SCOOP™ and raised profile TRIFORCE™ cutters illustrate the broad scope of shapes and cutting forces being developed. The concave geometry uniquely varies cutter aggressiveness to produce a highly […]

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