Long-term Comparison of Production Results from Open Hole and Cemented Multi-Stage Completions in the Barnett Shale
- Darrell Stephen Lohoefer (Eagle Oil & Gas Co.) | Daniel Snyder (Packers Plus) | Rocky Allen Seale (Packers Plus)
- Document ID
- Society of Petroleum Engineers
- IADC/SPE Asia Pacific Drilling Technology Conference and Exhibition, 1-3 November, Ho Chi Minh City, Vietnam
- Publication Date
- Document Type
- Conference Paper
- 2010. IADC/SPE Asia Pacific Drilling Technology Conference and Exhibition
- 2 Well Completion, 1.10.1 Drill string components and drilling tools (tubulars, jars, subs, stabilisers, reamers, etc), 1.6 Drilling Operations, 1.6.9 Coring, Fishing, 5.8.6 Naturally Fractured Reservoir, 2.4.3 Sand/Solids Control, 4.1.2 Separation and Treating, 3.2.3 Hydraulic Fracturing Design, Implementation and Optimisation, 5.1.1 Exploration, Development, Structural Geology, 2.5.2 Fracturing Materials (Fluids, Proppant), 1.6.6 Directional Drilling, 3 Production and Well Operations, 1.10 Drilling Equipment, 2.2.2 Perforating, 2.5.4 Multistage Fracturing, 1.14 Casing and Cementing, 5.8.2 Shale Gas
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The Barnett Shale is considered to be a prototype for other shale plays in North America and throughout the world because it was the first shale play to be developed. This paper describes production results from two horizontal wells in the Barnett Shale completed with open hole, multi-stage fracturing systems (OHMS) compared to direct offset wells with conventional cemented liner, "plug and perf?? completion.
Three years of monthly and cumulative production totals are analyzed and discussed. This paper also discusses the system details, the fracture methods used, as well as the operational efficiencies of OHMS compared to other horizontal completions methods.
These results demonstrate that OHMS technology provides a long-term option for the life of wells in shale plays.
The estimated ultimate recovery (EUR) values for shale gas plays has been a hotly contested issue over the past year due to observed "catastrophic?? production decline curves. This paper discusses how the choice of completion method can affect EUR by analyzing long-term production data from offset wells completed by
cemented liner plug and perf versus OHMS. This knowledge can be applied to any unconventional shale reservoir.
Formation Description. The Barnett Shale is a Mississippian-age shale located in the Fort Worth Basin and covers approximately 5,000 square miles of north-central Texas (Figure 1). The Barnett represents the grandfather of shale reservoirs where "shale as source rock?? was first established, and where the necessary set of technologies, namely horizontal drilling and multi-stage fracturing, were developed to make hydrocarbon extraction economically feasible in shale.
The Barnett is conformably overlain by the Pennsylvanian-age Marble Falls Limestone and unconformably overlies the Ordovician-age Viola Limestone/Ellenberger Group, which serves as a fracture barrier (Figure 2) (Bowker, 2003; Pollastro et al., 2003). The core area of the Barnett is located in the Denton, Wise and Tarrant Counties where it is approximately 300 to 500 ft thick with porosity and permeability values in the range of 3 to 5% and 0.00007 to 0.0005 mD, respectively (Fisher et al., 2004; Franz et al., 2005; Ketter et al., 2006). The Barnett is a naturally fractured reservoir where hydraulic stimulation induces development of a complex, interconnected fracture network, resulting in greater access to the formation (Fisher et al., 2004; Warpinski et al., 2005).
Completions History. Vertical wells were first drilled in the Barnett Shale in the early 1980s, but commercial production would not occur until almost two decades later with the advent of horizontal drilling in 2002 (Bowker, 2003; Fisher et al., 2004; Ketter et al., 2006). Because it was the first shale play to be developed, the Barnett has been a testing ground for various completion methods including those described below.
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