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In computational geometry and computer science, the minimum-weight triangulation problem is the problem of finding a triangulation of minimal total edge length. [1] That is, an input polygon or the convex hull of an input point set must be subdivided into triangles that meet edge-to-edge and vertex-to-vertex, in such a way as to minimize the ...
Drill stem testing is an oil and gas exploration procedure to isolate, stimulate and flow a downhole formation to determine the fluids present and the rate at which they can be produced. The main objective of a DST is to evaluate the commercial viability of a zone's economic potential by identifying productive capacity, pressure, permeability ...
Hydro means water, or fluid, that exerts pressure and static means not moving or at rest. Therefore, hydrostatic pressure is the total fluid pressure created by the weight of a column of fluid, acting on any given point in a well. In oil and gas operations, it is represented mathematically as
FLOT – flying lead orientation tool; FLOW – flow and buildup test report; FLRA – field-level risk assessment; FLS – fluid sample; FLT – fault (geology) FLT – flying lead termination; FLTC – fail locked tending to close; FLTO – fail locked tending to open; FMD – flooded member detection; FMEA – failure modes, & effects analysis
Fluid level drop is the distance the mud level will drop when a dry string(a bit that is not plugged) is being pulled from the wellbore and it is given by: Fluid level drop = Bbl disp / (CSG cap + Pipe disp) or Fluid level drop = Bbl disp / (Ann cap + Pipe cap) and the resulting loss of HSP is given by: Lost HSP = 0.052 × MW × Fluid drop. where
Production tests involve flowing the well at different rates and measuring the flow rates and pressures. –Buildup tests: Buildup tests are conducted on producing wells to measure reservoir pressure and permeability. Builtup tests involve shutting in the well after a production test and measuring the pressure as it builds back up. [7]
For example, if the tool fails at 1,500 ft (460 m) while drilling with a triple rig (able to trip 3 joints of pipe, or about 90 ft (30 m) feet, at a time), then it would generally be faster to pull the tool out of the hole than it would be to rig up wireline and retrieve the tool, especially if the wireline unit must be transported to the rig.
A dead weight tester (DWT) is a calibration standard method that uses a piston cylinder on which a load is placed to make an equilibrium with an applied pressure underneath the piston. Deadweight testers are secondary standards which means that the pressure measured by a deadweight tester is defined through other quantities: length, mass and time.