Effects of High Pressure-Dependent Leakoff and High Process-Zone Stress in Coal-Stimulation Treatments
- Muthukumarappan Ramurthy (Halliburton) | William S. Lyons (Anadarko Petroleum Corp.) | Randall B. Hendrickson (XTO Energy) | Robert D. Barree (Barree & Associates) | Douglas P. Magill (Halliburton)
- Document ID
- Society of Petroleum Engineers
- SPE Production & Operations
- Publication Date
- August 2009
- Document Type
- Journal Paper
- 407 - 414
- 2009. Society of Petroleum Engineers
- 4.1.2 Separation and Treating, 5.5.8 History Matching, 2.2.2 Perforating, 3.2.3 Hydraulic Fracturing Design, Implementation and Optimisation, 5.6.5 Tracers, 1.2.3 Rock properties, 2.5.2 Fracturing Materials (Fluids, Proppant), 2.4.3 Sand/Solids Control, 5.8.3 Coal Seam Gas, 3 Production and Well Operations
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Hydraulic fracturing in coals has been studied extensively over the last two decades; however, there are factors that were often ignored or incorrectly diagnosed, resulting in screenouts. Assuming that a majority of the perforations are open and there are no problems with the stimulation fluids, screenouts during coal hydraulic-fracture treatments can be attributed to either high pressure-dependent leakoff (PDL), high process-zone stress (PZS) or in some cases both. The objective of this work is to discuss, help identify, and present solutions to address these reservoir-related issues such that screenouts can be avoided in optimized refracture treatments and new well stimulations.
The tools for identifying these reservoir-related parameters include a diagnostic fracture-injection test (DFIT) and a grid-oriented fully functional 3D fracture simulator with shear decoupling. An example for each respective case is presented in this paper. In the first example, in which high PZS was considered to be the dominant reason for screenout or pressure out, the well was restimulated successfully by implementing the solutions presented in this paper. In the second example, in which high PDL was considered to be the main reason for screenout, there were several wells in the same project area that exhibited the same behavior resulting in screenouts. After implementing the solutions presented in this paper to address high PDL, all new wells were stimulated successfully without any issues.
|File Size||1 MB||Number of Pages||8|
Barree, R.D. 1998. Applicationsof Pre-Frac Injection/Falloff Tests in Fissured Reservoirs--Field Examples.Paper SPE 39932 presented at the SPE Rocky Mountain Regional/Low- PermeabilityReservoirs Symposium, Denver, 5-8 April. doi: 10.2118/39932-MS.
Barree, R.D. and Mukherjee, H. 1996. Determination of Pressure DependentLeakoff and its Effect on Fracture Geometry. Paper SPE 36424 presented atthe SPE Annual Technical Conference and Exhibition, Denver, 6-9 October. doi:10.2118/36424-MS.
Castillo, J.L. 1987. ModifiedFracture Pressure Decline Analysis Including Pressure-Dependent Leakoff.Paper SPE 16417 presented at the Low-Permeability Reservoirs Symposium, Denver,18-19 May. doi: 10.2118/16417-MS.
Conway, M.W., Barree, R.D., Hollingshead, C.W., and Farrens, M. 1997.Characterization and Performance of Coalbed Methane Wells in Drunkards Wash,Carbon County, Utah. Paper ICBMS 9736 presented at the International CoalbedMethane Symposium, Tuscaloosa, Alabama, 12-16 May.
Ramurthy, M. and Lyons, W. 2006. Lessons Learned From Modeling HydraulicFracture Treatments in Coals Using a Fully Functional Three DimensionalFracture Model in a San Juan Basin Project. Paper ICBMS 0634 presented at the2006 International Coalbed Methane Symposium, Tuscaloosa, Alabama, USA, 22-26May.
Shlyapobersky, J. and Chudnovsky, A. 1994. Review of recent developments infracture mechanics with petroleum engineering applications. Paper SPE 28074presented at Rock Mechanics in Petroleum Engineering, Delft, The Netherlands,29-31 August. doi: 10.2118/28074-MS.
WinGOHFER 2005 SP1. 2005. Stim-Lab (Core Laboratories), http://gohfer.corelab.com/.
WinGOHFER User Manual--Version 2005 SP1. 2005. Duncan, Oklahoma: Stim-Lab(Core Laboratories).