Minidrillstem Tests To Characterize Formation Deliverability in the Bakken
- Basak Kurtoglu (Marathon Oil Company) | Hossein Kazemi (Colorado School of Mines) | Edward C. Boratko (Schlumberger) | Jim Tucker (Schlumberger) | Reagan Daniels (Marathon Oil Company)
- Document ID
- Society of Petroleum Engineers
- SPE Reservoir Evaluation & Engineering
- Publication Date
- August 2013
- Document Type
- Journal Paper
- 317 - 326
- 2013. Society of Petroleum Engineers
- 5.5.11 Formation Testing (e.g., Wireline, LWD), 5.6.4 Drillstem/Well Testing, 5.6.8 Well Performance Monitoring, Inflow Performance, 3.2.3 Hydraulic Fracturing Design, Implementation and Optimisation, 5.6.3 Pressure Transient Testing, 1.6.9 Coring, Fishing
- 9 in the last 30 days
- 945 since 2007
- Show more detail
- View rights & permissions
|SPE Member Price:||USD 10.00|
|SPE Non-Member Price:||USD 30.00|
Characterization of reservoir deliverability is fundamental for the economic development of any field. In the Bakken, there is a need for reliable pressure-transient tests to provide the effective formation permeability of the fracture/matrix system in this formation for deliverability calculations. This effective permeability can then be compared with laboratory-measured core permeability of the matrix rock samples. This comparison is the basis for planning early-production options and subsequent enhanced-oil-recovery (EOR) decisions. This comparison is particularly important because of the influence of massive hydraulic-fracture stimulation on reservoir performance. Determining well-deliverability potential by conventional drillstem tests (DSTs) or traditional wireline formation tests (WFTs) in the past has resulted in mixed success in the Bakken. On the other hand, the mini-DST has increased the reliability of pressure-transient tests because the formation interval of interest is produced at a precise constant rate into a chamber between two inflated packers with negligible wellbore-storage effects. Also, the operation of a mini-DST tool requires much less time than the classical DST, and multiple zones can be tested sequentially to assess the individual- zone deliverability. The mini-DST tool uses the conventional WFT configured with a dual-packer module and downhole pump. Tests are conducted by inflating the dual-packer module to isolate a 3-ft interval of the wellbore. The formation fluid is pumped out from the packer-isolated wellbore interval to conduct pressure drawdown and -buildup tests in the interval. An overlay of all the pressure-drawdown and -buildup results from various intervals is compared on a single plot to identify the most productive interval. Finally, conventional pressure-transient analyses are performed to interpret all pressure-drawdown and -buildup tests. In this paper, we present several field tests that were analyzed both by the preceding procedure and by numerical simulation. The analyses of several mini-DST results have provided insight into a better understanding of the flow mechanism in the Bakken both during primary production and in forecasting various improved-recovery and EOR proposals. The results can also serve as a basis for test design in similar low-permeability reservoirs elsewhere.
|File Size||1 MB||Number of Pages||10|
Joseph, J.A. and Koederitz, L.F. 1985. Unsteady-State Spherical Flow WithStorage and Skin. SPE J. 25 (6): 804-822. http://dx.doi.org/10.2118/12950-PA.
Kuchuk, F.J. 1998. Interval Pressure Transient Testing With MDT Packer-ProbeModule in Horizontal Wells. SPE Res Eval & Eng 1 (6):509-518. http://dx.doi.org/10.2118/53002-PA.
Kume, J. 1963. The Bakken and Englewood Formations of North Dakota andNorthwestern South Dakota. North Dakota Geological Survey Bull. 39,87.
Kurtoglu, B. and Kazemi, H. 2012. Evaluation of Bakken Performance UsingCoreflooding, Well Testing, and Reservoir Simulation. Paper SPE 155655presented at the SPE Annual Technical Conference and Exhibition, San Antonio,Texas, 8-10 October. http://dx.doi.org/10.2118/155655-MS.
LeFever, J.A., Martiniuk, C.D., and Mahnic, P.A. 1991. Petroleum Potentialof the Middle Member, Bakken Formation, Williston Basin. Proceedings of the6th International Williston Basin Symposium: Saskatchewan Geogical SocietySpecial Publication 11, 76-94.
Saphir Version 4.20.03 Software. 2011. Sophia Antipolis, France: KappaEngineering.
Sonnenberg, S.A. and Pramudito, A. 2009. Petroleum Geology of the Giant ElmCoulee Field, Williston Basin. AAPG Bull. 93 (9):1127-1153. http://dx.doi.org/10.1306/05280909006.
Webster, R.L. 1984. Petroleum Source Rocks and Stratigraphy of the BakkenFormation in North Dakota, 57-81, Denver: Rocky Mountain Association ofGeologists.