3/25/2023 0 Comments Directional drilling definitionSince most of the equipment and services came from the oil industry they tended to be expensive. Until the mid 1980s, the technique was almost solely confined to the pipeline market. The economics of the operation conversely was not oilfield It was provided by the pipeline construction Industry that generally incorporated fiver crossing into their bid to construct a complete spread, sometimes running hundreds of miles, Most ancillary equipment like power packages, mud pumps, mud cleaning equipment drill pipe down hole equipment instrumentation and general technique comes even today from the oil industry. These rigs tended to be large and heavy requiring a number of trailer loads to rig up on a crossing location, Geotechnical engineering firms provided local geological information. A cable can generate extremely high pulling power in an economical rig package and some of the early rigs even today have the pulling records. The early rigs used cables and sheaves to generate push and pull and in fact some still do. The rigs came from drilling contractors and directional drilling techniques came from oilfield directional contractors. Finally, when the bore reached the planned diameter, the product line was pulled into positionĪlmost all of the early expertise migrated from the oil Industry. If hard, oilfield hole openers were used. Once the Pilot hole exited in an acceptable position, hole- enlarging operations could commence, If the formation was soft a fly cutter or barrel reamer was used. Generally, these jobs lasted some time primarily due to lack of instrument accuracy and the inordinate amount of time necessary to run and retrieve a single shot instrument. This process in some cases was repeated a number of times until an acceptable position was reached. If not acceptable, the assembly was withdrawn to a planned position, the bore sidetracked and drilled again to a secondary punch out. Eventually the pilot bore reached the target side of the never where acceptance of punch-out was determined. The next tool setting was then made and drilling progressed. The single shot film was developed and the results calculated and plotted on the drilling plan. The survey was taken and the instrument was withdrawn from the pipe. It was possible to guide a borehole to a predetermined target on the opposite side of a river or canal This was done using a downhole motor for drilling and magnetic single shot guidance, A single joint was drilled and a magnetic compass and plumb bob assembly was pumped down the drill string to land within a non-magnetic drill collar above the motor. Why Drill Directionally? Planning A Directional Well Path How To Drill Directionally? Horizontal Drilling Complex Wellsģ Definition Directional drilling is the science of deviating a well bore along a planned course to a subsurface target whose location is a given lateral distance and direction from the vertical.ĭirectional wells are deviated from vertical (straight) Directional wells are drilled with intentional control to hit a pre-determined target: inclination (angle) azimuth (direction).The first pipeline river crossing utilizing the horizontal directional drilling technique occurred in the seventies It was realized that with then current technology In the oil industry. Khalifah Al-Amri Senior Drilling & Workover EngineerĢ Outline Definition What Are Directional Wells ? Directional Well Types
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