Measurement-While-Drilling

Keywords d rec methods, indirect methods, rock properties, coring, core barrel, standard core analysis, special core analysis, slabbed core, sidewall samples, direct indications, microfossils, sonde, logging unit, invasion, mudcake, formation pressure measurement, fluid sampling, measurement while drilling, formation evaluation while drilling. 

Unless a measure while drilling instrument is used, there is no way to ascertain whether the turbine motor is operating efficiently since rotation speed and/or torque cannot be measured using normal surface data (i.e., standpipe pressure, weight on bit, etc.). 

Measurements while drilling are made with sensors and downhole electronics that must operate in an environment where vibrations and shocks are sometimes extremely severe. A brief study of vibrations and shocks will be made to understand better the meaning of the specifications mentioned earlier. 

MWD Measurement-While-Drilling, Inteq-Baker-Hughes, Brochure 602-003, August 1993. 

Knox, D. W. J., and J. M. Milne, Measurement-while-drilling tool performance, SPE 16523, Offshore Europe 1987 Conference, Aberdeen, Proceedings Vol. 1, September 1987. 

Hutchinson, M. W., Measurement While Drilling and After Drilling by Multiple Service Companies Through Upper Carboniferous Formations at a Borehole Test Facility, Kay County, Oklahoma, SPE 22735, 66th Ann. Techn. Conf., Dallas, TX, October 6-9, pp. 741-753, 1991. 

A wellbore fluid has been developed that has a nonaqueous continuous liquid phase that exhibits an electrical conductivity increased by a factor of 10 to 10 compared with conventional invert emulsion. 0.2% to 10% by volume of carbon black particles and emulsifying surfactants are used as additives. Information from electrical logging tools, including measurement while drilling and logging while drilling, can be obtained [1563]. 

W. C. Chin. Formation invasion With applications to measurement-while-drilling, time lapse analysis, and formation damage. Gulf Publishing Co, Houston, 1995. 

Intermediate and low-rate cells are employed in oil exploration measure-while-drilling (MWD) equipment since they are capable of operating at high temperature. 

Directional drilling — Technologies such as steerable downhole motor assembhes and measurement-while-drilling tools allow driUing to occur on the horizontal. The three variations of directional drilhng are extended-reach drilling horizontal drilhng and multiple laterals. 

Dewan, J.T., and Chenevert, M.E., Mudeake Buildup and Invasion in Low Permeability Formations Application to Permeability Determination by Measurement While Drilling, Paper NN, SPWLA 34th Annual Logging Symposium, June 13-16, 1993. 

U.S. Patent No. 5,740,126. Turbosiren Signal Generator for Measurement While Drilling Systems, with T. Ritter, April 14, 1998... 

US05740126 (04/14/1998), Turbo-siren signal generator for measurement while drilling systems... 

EP00747571A2 (12/11/1996), Downhole pressure pulse generator US05583827 (12/10/1996), Measurement-while-drilling system and method... 

Lockwood, G.J., R.A. Normann, and C.V. Williams. 1997. A final report of the environmental measurement-while-drilling-gamma ray spectrometer system technology demonstration at the Savannah River Site F area retention basin. Sandia Natl. Lab. Rep. SAND97-2028 UC-600. 

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