modular measurement-while-drilling bottom hole assembly, consisting primarily of a bi-directional communication and power module and an electronic sensor module generally having a central processor, data memory and a plurality of sensors for making directional, drilling and formation measurements, namely, direction, temperature, bore and annular pressure, formation density, porosity, resistivity, vibration, stick/slip, gamma ray and other drilling system or formation evaluation measurements, that is used for directional drilling and formation evaluation in subterranean oil, gas, water, mineral and geothermal cell formations

'annular':49 'assembl':8 'bi':14 'bi-direct':13 'bore':47 'bottom':6 'cell':84 'central':28 'communic':16 'consist':9 'data':30 'densiti':52 'direct':15,39,45,71 'drill':5,40,61,72 'electron':22 'evalu':65,75 'format':42,51,64,74,85 'gamma':57 'gas':79 'general':25 'geotherm':83 'hole':7 'make':38 'measur':3,43,66 'measurement-while-dril':2 'memori':31 'miner':81 'modul':19,24 'modular':1 'name':44 'oil':78 'plural':34 'poros':53 'power':18 'pressur':50 'primarili':10 'processor':29 'ray':58 'resist':54 'sensor':23,36 'stick/slip':56 'subterranean':77 'system':62 'temperatur':46 'use':69 'vibrat':55 'water':80

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