Petrophysical Measurements From Drill Cuttings: An Added Value for the Reservoir Characterization Process
- Patrick Egermann (Institut Francais du Petrole IFP) | Nicole Doerler (Institut Francais du Petrole IFP) | Marc Fleury (Institut Francais du Petrole IFP) | Joelle Behot (Institut Francais du Petrole IFP) | F. Deflandre (Institut Francais du Petrole IFP) | Roland Lenormand (Institut Francais du Petrole IFP)
- Document ID
- Society of Petroleum Engineers
- SPE Reservoir Evaluation & Engineering
- Publication Date
- August 2006
- Document Type
- Journal Paper
- 302 - 307
- 2006. Society of Petroleum Engineers
- 1.6.9 Coring, Fishing, 5.6.1 Open hole/cased hole log analysis, 1.11 Drilling Fluids and Materials, 5.3.1 Flow in Porous Media, 5.6.2 Core Analysis, 1.2.3 Rock properties, 5.8.7 Carbonate Reservoir, 1.6 Drilling Operations, 5.1 Reservoir Characterisation, 5.8.2 Shale Gas, 5.5.2 Core Analysis, 5.3.2 Multiphase Flow, 5.4.2 Gas Injection Methods
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Permeability and porosity are necessary for reservoir characterization, and cuttings can provide quick information using dedicated measurement techniques. In this paper, we present the first applications of these techniques on real reservoir characterization cases and the comparisons with logs and core data.
The method of permeability measurement from cuttings is based on a pressure pulse applied to a cell filled initially with cuttings saturated with viscous fluid in the presence of trapped gas. The permeability is derived from the transient response of the oil invasion into the cuttings by using a numerical approximation of a mathematical model. The porosity of dry drill cuttings is measured using the routine helium technique. These methods were tested and validated by using various samples of crushed rock of known permeability and porosity. Both measurement techniques are fast, require light conditioning, are applicable over a large range of permeability, and need only 1 mL of sieved rock to be carried out.
In this paper, we present a field application of an integrated drill cuttings measurement program [permeability, porosity, nuclear magnetic resonance (NMR) T 2 distribution] on a carbonate reservoir. Various drilling conditions [including water-based mud (WBM) and oil-based mud (OBM)] and lithologies have been investigated to develop the different techniques that are presented in the paper. The question of whether measurements on cuttings are representative of the native reservoir is of primary importance and was checked by comparing the consistency of the porosity measurements obtained from cuttings with other data (cores or logs). The overall results demonstrate the added value of k and f measurements from cuttings in addition to the data that are commonly collected.
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