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Research Papers: Petroleum Engineering

Simulating Multizone Fracturing in Vertical Wells

[+] Author and Article Information
Wei Wang, Arash Dahi Taleghani

Louisiana State University,
Crafts and Hawkins,
Department of Petroleum Engineering,
Baton Rouge, LA 70803

Contributed by the Petroleum Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received October 24, 2013; final manuscript received May 7, 2014; published online June 5, 2014. Assoc. Editor: Andrew K. Wojtanowicz.

J. Energy Resour. Technol 136(4), 042902 (Jun 05, 2014) (8 pages) Paper No: JERT-13-1304; doi: 10.1115/1.4027691 History: Received October 24, 2013; Revised May 07, 2014

Numerous multizone multistage hydraulic fracturing treatments are now being executed in low permeability oil and gas fields around the world. Due to the limited access to the subsurface, post-treatment assessments are mainly limited to few techniques such as tiltmeter, microseismic, and tracer-logs. The first two techniques are mainly used to determine fracture extension; however, fracture height and fracture initiation at all perforation clusters could only be confirmed through radioactive tracer logs or detailed pressure analysis. In this paper, we consider real examples from a field from Central America and investigate potential problems that led to the limited generation of fractures in multizone treatments. For instance, some of the postfrac radioactive logs show very low concentration of tracers at some perforated zones in comparison with other zones. On the other hand in some cases, tracer logs indicate the presence of tracers in deeper or shallower zones. Different reasons could cause fracture growth in nonperforated zones, including but not limited to: perforation design problems, casing/cement integrity problems, lack of containment, instability of fracture growth in one or some of the zones, and finally making a mistake in selecting lithology for fracturing. In this paper, some of these issues have been examined for a few sample wells using treatment pressure data, petrophysical logs, and postfrac tracer logs. Some recommendations in designing the length and arrangement of perforations to avoid these problems in future fracturing jobs are provided at the end of this paper.

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References

Warpinski, N. R., Lorenz, J. C., Branagan, P. T., Myal, F. R., and Gall, B. L., 1993, “Examination of a Cored Hydraulic Fracture in a Deep Gas Well,” SPE Prod. Facil., 8, pp. 150–158. [CrossRef]
Dahi Taleghani, A., and Olson, J., 2009, “Analysis of Multi-Stranded Hydraulic Fracture Propagation: An Improved Model for the Interaction Between Induced and Natural Fractures,” SPE Annual Technical Conference and Exhibition, New Orleans, Louisiana, Oct. 4–7, Paper No. ATCE SPE 124884.
Dahi Taleghani, A., and Olson, J., 2013, “How Natural Fractures Could Affect Hydraulic Fracture Geometry,” SPE J., 19, pp. 161–171. [CrossRef]
Olson, J., and Taleghani, A. D., 2009, “Modelling Simultaneous Growth of Multiple Hydraulic Fractures and Their Interaction With Natural Fractures,” Hydraulic Fracturing Technology Conference, Paper No. SPE 119739.
Cipolla, C. L., Warpinski, N. R., Mayerhofer, M. J., Lolon, E. P., and Vincent, M. C., 2010, “The Relationship Between Fracture Complexity, Reservoir Properties, and Fracture-Treatment Design,” SPE Prod. Oper., 25(4), pp. 438–452.
Gadekea, L. L., and Smith, H. D., 1987, “Trancerscan: A Spectroscopy Technique for Determining the Distribution Of Multiple Radioactive Tracers In Downhole Operations,” Log Anal., 28(1), pp. 27–39.
Miller, W. K., Peterson, R. E., Stevens, J. E., Lackey, C. B., and Harrison, C. W., 1994, “In-Situ Stress Profiling and Prediction of Hydraulic Fracture Azimuth for the West Texas Canyon Sands Formation,” SPE Prod. Facil., 9(3), pp. 204–210. [CrossRef]
Mulkern, M., Masnyk, B., Kramer, H., and Sites, J., 2012, “A Green Alternative for Determination of Frac Height and Proppant Distribution,” SPE Eastern Regional Meeting, Morgantown, WV, Oct. 13–15, Paper No. SPE 138500.
Ahmed, U., Thompson, T. W., and Kelkar, S. M., 1984, “Perforation Placement Optimization: A Modified Hydraulic Fracturing Technique,” Paper Presented at SPE/DOE/GRI Unconventional Gas Recovery Symposium, Pittsburgh, PA, May 13–15, SPE/DOE/GRI Paper No. 12841.
Crump, J., and Conway, M., 1988, “Effects of Perforation-Entry Friction on Bottomhole Treating Analysis,” J. Pet. Technol., 40(8), pp. 1041–1048. [CrossRef]
Abbas, S., Lecampion, B., and Prioul, R., 2013, “Competition Between Transverse and Axial Hydraulic Fractures In Horizontal Wells,” Proceedings of 2013 SPE Hydraulic Fracturing Technology Conference, The Woodlands, TX, Feb. 04–06.
Dahi Taleghani, A., 2011, “Modeling Simultaneous Growth of Multi-Branch Hydraulic Fractures.” 45th US Rock Mechanics/Geomechanics Symposium, San Francisco, CA, June 26–29, Paper No. ARMA-11-436.
Sumi, Y., Nemat-Nasser, S., and Keer, L. M., 1980, “A New Combined Analytical and Finite-Element Solution Method for Stability Analysis of the Growth of Interacting Tension Cracks in Brittle Solids,” Int. J. Eng. Sci., 18(1), pp. 211–224. [CrossRef]
Bazant, Z., and Cedolin, L., 1991, “Stability of Structures,” The Oxford Engineering Science Series, Oxford University Press, New York.
American Petroleum Institute (API), 2009, API/HF1, Hydraulic Fracturing Operations—Well Construction and Integrity Guidelines, 1st ed., Washington, D.C.
Sarris, E., and Papanastasiou, P., 2011, “The Influence of the Cohesive Process Zone in Hydraulic Fracturing Modeling,” Int. J. Fract., 167(1), pp. 33–45. [CrossRef]
Wang, W., and Dahi Taleghani, A., 2014, “Cement Sheath Integrity During Hydraulic Fracturing: An Integrated Modeling Approach,” SPE Hydraulic Fracturing Technology Conference The Woodlands, TX, Feb. 4–6 February, Paper No. SPE-168642-MS.
Dugdale, D. S., 1960, “Yielding of Steel Sheets Containing Slits,” J. Mech. Phys. Solids, 8, pp. 100–104. [CrossRef]
Barenblatt, G. I., 1962, “The Mathematical Theory of Equilibrium Cracks in Brittle Fracture,” ASME J. Appl. Mech., 7, pp. 55–129.
Tvergaard, V., and Hutchinson, J. W., 1996, “Effect of Strain-Dependent Cohesive Zone Model on Predictions of Crack Growth Resistance,” Int. J. Solids Struct., 33, pp. 3297–3308. [CrossRef]
Xie, M., 1995, “Finite Element Modeling of Discrete Crack Propagation,” Ph.D. thesis, University of New Mexico, Albuquerque, NM.
Camanho, P. P., and Dávila, C. G., 2002, “Mixed-Mode Decohesion Finite Elements for the Simulation of Delamination in Composite Materials,” NASA-Technical Paper No. 211737.
Cui, W., Wisnom, M. R., and Jones, M., 1992, “A Comparison of Failure Criteria to Predict Delamination of Unidirectional Glass/Epoxy Specimens Waisted Through the Thickness,” Composites, 23(3), pp. 158–166. [CrossRef]
Dávila, C. G., and Johnson, E. R., 1993, “Analysis of Delamination Initiation in Postbuckled Dropped-Ply Laminates,” AIAA J., 31(4), pp. 721–727. [CrossRef]
Camanho, P. P., and Matthews, F. L., 1999, “Delamination Onset Prediction in Mechanically Fastened Joints in Composite Laminates,” J. Compos. Mater., 33, pp. 906–927. [CrossRef]
Benzeggagh, M. L., and Kenane, M., 1996, “Measurement of Mixed-Mode Delamination Fracture Toughness of Unidirectional Glass/Epoxy Composites With Mixed-Mode Bending Apparatus,” Compos. Sci. Technol., 56, pp. 439–449. [CrossRef]
Reeder, J. R., and Crews, J. H., 1988, “Mixed-Mode Bending Method for Delamination Testing,” AIAA J., 28(7), pp. 1270–1276. [CrossRef]
Griffith, A. A., 1924, “The Theory of Rupture,” Proceedings of First International Congress Applied Mechanics, Delft.
Rice, J. R., 1968, “A Path Independent Integral and the Approximate Analysis of Strain Concentration by Notches and Cracks,” J. Appl. Mech., 31, pp. 379–386. [CrossRef]
Mavko, G., Mukerji, T., and Dvorkin, J., 2009, The Rock Physics Handbook: Tools for Seismic Analysis of Porous Media, Cambridge University Press, New York.
Detournay, E., and Cheng, A. H. D., 1991, “Plane Strain Analysis of a Stationary Hydraulic Fracture in a Poroelastic Medium,” Int. J. Solids Struct., 37(13), pp. 1645–1662. [CrossRef]
Bourgoyne, A. T., Chenevert, M. E., Millheim, K. K., and Young, F. S., 1986, Applied Drilling Engineering, Society of Petroleum Engineering Vol. 2, pp. 312–324.
Halliburton, 2001, “Halliburton Cementing Tables,” The Red Book, Halliburton Co., Duncan, OK.
Chen, Z., Bunger, A. P., Zhang, X., and Jeffrey, R. G., 2009, “Cohesive Zone Finite Element-Based Modeling of Hydraulic Fractures,” Acta Mechanica Solida Sinica, 22(5), pp. 443–452 [CrossRef]

Figures

Grahic Jump Location
Fig. 1

Tracer log of a tight oil vertical well in North America, fractures are initiated along the whole perforated zone and stayed contained in this zone after propagation. Horizontal tracer mark at 1207 m looks to be the bedding plane artifact.

Grahic Jump Location
Fig. 2

A two-stage fracturing job has been performed as shown above. The first stage shows limited fluid entry. In the second stage, tracers were only tracked in the shallower part of the zone.

Grahic Jump Location
Fig. 3

An example of fracture growth beyond the perforate intervals, in this case, pumping more fluid only adds to the fracture height not the fracture length

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Fig. 4

Linear softening traction–separation law for the cohesive element under pure shear loading (left) and pure normal loading (right)

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Fig. 5

A schematic picture of the numerical model with one potential hydraulic fracture zone and the interface between two planes are shown in (a). It also shows the model's dimensions, boundary, and loading conditions, and meshes for the three-dimensional model (shown in (b)).

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Fig. 6

Injection rate variation at the perforation clusters

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Fig. 7

A schematic picture of fracture (shown in red) propagation in a model with two perforation clusters, where larger flow is diverted into the lower large perforation zone. The dimensionless time is as shown in Fig. 6.

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Fig. 8

A schematic picture of fracture propagation through two perforation clusters, where larger volume of flow is diverted into the lower large perforation zone. In this example, the rock is considered to be heterogeneous.

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