Coiled tubing (CT) drilling offers more efficient drilling operations compared to normal drilling practises resulting in lower operational costs and drilling time in oil and gas operations. This technology is recommended to be used for mineral exploration drilling in hard rock. This requires drilling micro-boreholes at very high speed with small size cuttings. A large volume of such small size cuttings can influence the rheological properties of the drilling fluids significantly.
The aim of this study is to understand the effect of small size inert cuttings on the rheological properties of drilling fluids and its consequences on pressure drop changes in the annulus space. Experimental tests were performed on cuttings collected from a mining site, and the results indicated that the fluid rheology is sensitive to the cuttings size. This conclusion suggests that careful measurement of rheological properties of the mud is necessary when it is designed for drilling hard rocks.
AlbrightJ., DreesenD., AndersonD., BlacicJ., ThomsonJ. and FairbanksT.2005. Road map for a 5000-ft microborehole, Los Alamos National Laboratory. Los Alamos, New Mexico, USA.
2.
American Petroleum Institute. 2010. Rheology and hydraulics of oil-well fluids, American Petroleum Institute. API Publishing Services, Washington, DC, USA.
3.
BinghamE. C.1922. Fluidity and plasticity, New York, McGraw-Hill.
4.
BourgoyneA. T., MillheimK. K., ChenevertM. E. and YoungF. S.1986. Applied drilling engineering, Society of Petroleum Engineers, Richardson, TX, USA.
5.
DoronP. and BarneaD.1996. Flow pattern maps for solid–liquid flow in pipes, Int. J. Multiphas. Flow, 22, 273–283.
6.
DoronP., GranicaD. and BarneaD.1987. Slurry flow in horizontal pipes—experimental and modeling, Int. J. Multiphas. Flow, 13, 535–547.
7.
FangaryY., GhaniA., El HaggarS. and WilliamsR.1997. The effect of fine particles on slurry transport processes, Miner. Eng., 10, 427–439.
8.
FordhamE. J., BittlestonS. H. and TehraniM. A.1991. Viscoplastic flow in centered annuli, pipes, and slots, Ind. Eng. Chem., 30, 517–524.
9.
FounargiotakisK., KelessidisV. C. and MaglioneR.2008. Laminar, transitional and turbulent flow of Herschel–Bulkley fluids in concentric annulus, Can. J. Chem. Eng., 86, 676–683.
10.
GovierG. W. and AzizK.1972. The flow of complex mixtures in pipes, Van Nostrand Reinhold Co. Society of Petroleum Engineers, Richardson, TX, USA.
11.
HanksR. W.1979. The axial laminar flow of yield-pseudoplastic fluids in a concentric annulus, Ind. Eng. Chem., 18, 488–493.
12.
HartnettJ. P. and KosticM.1990. Turbulent friction factor correlations for power law fluids in circular and non-circular channels, Int. Commun. Heat Mass, 17, 59–65.
13.
HerschelW. H. and BulkleyR.1926. Konsistenzmessungen von Gummi-Benzollösungen, Colloid Polym. Sci., 39, 291–300.
14.
HillisR.2012. Uncovering the future of drilling, The AusIMM Bulletin, RESolutions Publishing & Media Pvt Ltd.
15.
HussainQ. E. and SharifM. A. R.1997. Viscoplastic fluid flow in irregular eccentric annuli due to axial motion of the inner pipe, Can. J. Chem. Eng., 75, 1038–1045.
16.
IyohoA. and AzarJ.1981. An accurate slot-flow model for non-Newtonian fluid flow through eccentric annuli, SPE J., 21, 565–572.
17.
KamyabM., RasouliV., CavanoughG. and MandalS.2012. Challenges of cuttings transport in micro borehole coiled-tubing drilling for mineral exploration, in First International Conference on ‘Petroleum and Mineral Resources’ (ed. KhoshnawF. M.), Koya, Kurdistan, Iraq, 109–120. WIT Press, Ashurst, Southampton, UK.
18.
KamyabM., RasouliV., CavanoughG. and MandalS.2013a. Design of a slurry loop for cuttings transport studies in hard rock drilling applications, 23rd World Mining Congress, Montreal, QC, Canada.
19.
KamyabM., RasouliV., CavanoughG., and MandalS.2013b. Numerical simulations of cuttings transport in mineral exploration boreholes, 23rd World Mining Congress, Montreal, QC, Canada.
20.
KelessidisV. C. and BandelisG. E.2004. Flow patterns and minimum suspension velocity for efficient cuttings transport in horizontal and deviated wells in coiled-tubing drilling, SPE Drill. Completion, 19, 213–227.
21.
KelessidisV. C., DalamarinisaP. and MaglioneR.2011. Experimental study and predictions of pressure losses of fluids modeled as Herschel–Bulkley in concentric and eccentric annuli in laminar, transitional and turbulent flows, J. Petrol. Sci. Eng., 77, 305–312.
22.
KelessidisV. C., MaglioneR., TsamantakiC. and AspirtakisY.2006. Optimal determination of rheological parameters for Herschel–Bulkley drilling fluids and impact on pressure drop, velocity profiles and penetration rates during drilling, J. Petrol. Sci. Eng., 53, 203–224.
23.
LairdW.1957. Slurry and suspension transport—basic flow studies on Bingham plastic fluids.Ind. Eng. Chem., 49, 138–141.
24.
MandalS.2012. RE: AMC drilling fluid products.
25.
MetznerA. B. and ReedJ. C.1955. Flow of non-Newtonian fluids—correlation of the laminar, transition, and turbulent-flow regions.AIChE J., 1, 434–440.
26.
MokaramianA., RasouliV. and CavanoughG.2012a. Adopting oil and gas downhole motors for deep mineral exploration drilling, Deep Mining 2012, (ed. PotvinY.), Perth, Australia, 28–30 March 2012, Australian Centre for Geomechanics, 475–486.
27.
MokaramianA., RasouliV. and CavanoughG.2012b A feasibility study on adopting coiled tubing drilling technology for deep hard rock mining exploration, Deep Mining 2012, (ed. PotvinY.), Perth, Australia, 28–30 March 2012, Australian Centre for Geomechanics, 487–499.
28.
NaganawaS., and NomuraT.2006. Simulating transient behavior of cuttings transport over whole trajectory of extended reach well, IADC/SPE Asia Pacific Drilling Technology Conf. and Exhibition, Bangkok, Thailand, Society of Petroleum Engineers.
29.
RoufailR., RasouliV., MokaramianA., KamyabM., LagatC. and CavanoughG.2013. Utilising coiled tube rig for mineral exploration application, 23rd World Mining Congress, Montreal, QC, Canada.
30.
SorgunM., AydinI., OzbayogluE. and SchubertJ. J.2012. Mathematical modeling of turbulent flows of Newtonian fluids in a concentric annulus with pipe rotation, Energ. Source Part A, 34, 540–548.
31.
Uncover. 2012. Searching the Deep Earth: a vision for exploration geoscience in Australia, Canberra.
32.
Xiao-leG., Zhi-mingW. and Zhi-huiL.2010. Study on three-layer unsteady model of cuttings transport for extended-reach well, J. Petrol. Sci. Eng., 73, 171–180.
33.
ZamoraM., RoyS. and SlaterK.2005. Comparing a basic set of drilling fluid pressure-loss relationships to flow-loop and field data, AADE 2005 National Technical Conference and Exhibition.
