Drilling Procedures Sample Clauses

Drilling Procedures. A pilot hole shall be drilled on bore path per drawings with no deviations greater than five percent (5%) of depth over a span of one hundred feet (100'). If the pilot does deviate from the bore path more than five percent (5%) of depth in one hundred feet (100'), CONTRACTOR shall notify AVANGRID Engineer of any deviations and AVANGRID Engineer may require CONTRACTOR to pull-back and re- drill from the location along bore path before the deviation. In the event of a drilling fluid fracture, inadvertent returns or return loss occurs during pilot hole drilling operations, the CONTRACTOR shall cease drilling and wait at least thirty minutes, inject a quantity of drilling fluid with a viscosity exceeding 120 seconds as measured by a March funnel and then wait another thirty minutes. If mud fracture or returns loss continues, the CONTRACTOR will cease operations and notify the AVANGRID Engineer. AVANGRID Engineer and the CONTRACTOR will then discuss additional options and work will then proceed accordingly.

Drilling Procedures. In drilling and, where applicable, completing any well hereunder and connecting the same to the required gas transmission line, unless otherwise specified by Hesed, the Operator shall comply with the procedures set forth in Exhibit B attached hereto. The Operator will follow such of the foregoing steps as may be applicable in drilling and completing an oil well and will also take such actions as may be necessary or desirable, or otherwise specified by Hesed to permit the recovery and sale of oil there from if oil is discovered in marketable quantities.

Drilling Procedures. As there are many existing and potentially new methods for drilling and sampling that may be implemented on dams and levees, this regulation will not provide specific procedures. Most procedures are documented in applicable standards and reference documents. There are however, some general procedures that should be followed when using drilling fluids to limit the risk of damage. (1) Tools should be sized and designed to minimize the likelihood of the return flow clogging. Methods that require the cuttings to flow through a small annulus between the tools or casing and the borehole wall should not be used. (2) If possible, fluid discharges from the bit should be upward. A downward discharge increases the chance of clogging which could lead to a pressure spike. A lateral discharge into the sidewalls could lead to excessive disturbance or erosion. (3) Lower and raise drill tools slowly to avoid pressure changes in the drill hole; this is especially important when using tools with restricted annulus space below the groundwater table as the pressure changes are more severe and can lead to suction and surging problems. (4) Drilling feed rate must be slow enough to avoid crowding the bit and, thus, minimize the chance of inducing fracturing. The bit must be of a design such that pressure buildup is minimized. (5) Drilling media properties, pressure, and return should be continuously monitored. A floating needle pressure valve is required to record maximum pressure spikes that can occur instantaneously and are often unnoticed. (6) In some conditions, casing can be advanced ahead of the drilling bit to reduce the risk of hydraulic fracturing by confining the drilling fluids within the casing. (7) When core drilling rock, the embankment or foundation soil above top of rock must be protected and isolated from the circulating drilling fluid. Fractures in the bedrock must be considered as potential flow paths in contact with the overlying soil. (8) In situations where the presence of significant artesian pressure is suspected, which are common at the toe of dams, it may be necessary to use weighted drilling muds or raise the drill rig or install surface casing for pressure control along with the use of drilling mud. In some cases there may be a high risk of initiating internal erosion by drilling borings or excavating test pits in these areas. Emergency materials to stop progressive erosion in an excavation, a trench, or a borehole must be on site and readily available...