Formation volumetric evaluation while drilling
First Claim
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1. A method for investigating properties of subsurface formations traversed by a borehole, the method comprising the steps of:
- a. deriving a drilling signal indicative of the resistance of the formation to being drilled by a drill bit;
b. deriving a plurality of additional signals indicative of formation properties; and
b. in response to said drilling signal and to said additional signals, deriving a volumetric analysis of the subsurface formation.
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Abstract
Formation Strength and other measurement while drilling parameters are combined to produce a formation volumetric analysis which may including the traditional volumetric components of clay volume, sand volume, total porosity, and water filled porosity. In shaley formations, the volumetric analysis may also include an excess or overpressure porosity. Formation Strength may be derived from measurements of torque and weight on bit and be corrected for such effects as bit dullness, mud weight and hydrostatic pressure balance.
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13 Claims
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1. A method for investigating properties of subsurface formations traversed by a borehole, the method comprising the steps of:
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a. deriving a drilling signal indicative of the resistance of the formation to being drilled by a drill bit; b. deriving a plurality of additional signals indicative of formation properties; and b. in response to said drilling signal and to said additional signals, deriving a volumetric analysis of the subsurface formation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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