![]() ![]() Producing formations can be found under the hard, overhanging cap of salt domes. Formation pressures along fault planes may also affect hole conditions. In unstable areas, a wellbore drilled through a fault zone could be at risk because of the possibility of slippage or movement along the fault. Instead, the wellbore may be deflected perpendicular or parallel to the fault for better production. It is often difficult to drill a vertical well through a steeply inclined fault plane to reach an underlying hydrocarbon-bearing formation. Oriented sidetrack is required if a certain direction is critical in locating an anticipated producing formation. Drilling around obstructions, such as a lost string of pipe, is usually accomplished with a blind sidetrack. This technique may be employed either to drill around obstructions or to reposition the bottom of the wellbore for geological reasons. This is also applicable to multiple production zones adjacent to a fault plane or beneath a salt dome. There are certain cases in which the attitudes (bed dips) of the producing formations are such that the most economical approach is a directional well for a multiple completion. Applications like this are where “extended-reach” wells are most commonly drilled.Ī very cost-effective way of delivering high production rates involves intersecting multiple targets with a single wellbore. The location of a producing formation dictates the remote rig location and directional-well profile. Directional drilling has helped by greatly reducing the costs and environmental impact of this application.Ī well is directionally drilled to reach a producing zone that is otherwise inaccessible with normal vertical-drilling practices. Listed are some of the major applications of directional drillingįield developments, particularly offshore and in the Arctic, involve drilling an optimum number of wells from a single platform or artificial island. 1.1 Multiple wells from a single location.Previously with a diesel-hydraulic rig, consumption was 58 liters per hour. The first Danfoss-Normag rig was delivered to a client in Poland, who reported fuel consumption as low as 18 liters per hour. Operators benefit from significant fuel savings. These are built to use the quality of fuel locally available. With our system, operators have the freedom to rent locally the diesel generators they need for the particular job. The reason is that diesel quality is often not up to the quality needed for today’s gen-sets. In developing countries in particular, that is a huge advantage. It removes the need for dedicated generators as part of the mobile drilling apparatus. “In the world of horizontal drilling, this machine is a real game-changer because unlike conventional systems with hydraulic drivelines. Pieter Dijkstra, Managing Director of Danfoss Netherlands says: However, this is offset by the significant fuel savings and operational flexibility enabled by the new system. The electrified system adds approximately 10 percent to the overall capital cost of a €1 million mobile drilling rig. The machine has halved fuel consumption and associated emissions, and reduced noise generated by the operations. Meaning fewer carbon emissions are released which makes the new solution more environmentally friendly. The machine consumes less fossil energy than conventional systems. The machine offers greater operational flexibility in remote locations where conventional diesel-hydraulic systems have difficulty gaining access. They have been specifically designed to withstand the very wet and muddy conditions encountered in horizontal terrestrial drilling environments. ![]() The machine's operational controls are digital. Improving operational flexibility and reducing carbon emissions These provide a combined capacity of 750kW. ![]() These supply AC power to the three main electric motors and six ancillary ones that drive and control rig operations. Instead of the hydraulic motors and pumps that drive standard horizontal drilling systems, the Danfoss-Normag machine has 12 inverters. Additionally, ducting for pipework and cabling for power and other services in fully developed urban areas. This is to create tunnels for water, drainage, and sewerage. The Danfoss-Normag drill system can dig lateral shafts up to 1.2m in diameter, bored through subsoil for distances of 3km. Danfoss specifically developed the hybrid powertrain for the new steerable-drill system. In July 2017, Danfoss developed the world’s first hybrid electric horizontal drilling machine for groundwork applications. World’s first hybrid electric horizontal drilling machine for groundwork applications One that was far more fuel (and cost) efficient than its initial electrical rig. Normag, a Dutch industrial drilling equipment manufacturer, needed an HDD solution. ![]()
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