Maximizing Recoverable Reserves in Tight Reservoirs Using Geostatistical Inversion from 3-D Seismic: A Case Study From The Powder River Basin, USA

2015 ◽  
Author(s):  
Haihong Wang ◽  
Howard J. Titchmarsh ◽  
Kevin Chesser ◽  
Jeff Zawila ◽  
Samuel Fluckiger ◽  
...  
Keyword(s):  
River Basin ◽  
Powder River Basin ◽  
Recoverable Reserves ◽  
Geostatistical Inversion ◽  
Tight Reservoirs

Optimizing Completion Design and Well Spacing in the Powder River Basin Niobrara Oil Play

2021 ◽  
Author(s):  
Blake Burget ◽  
Neal Dannemiller ◽  
Dylan Garrett ◽  
Erik Kling
Keyword(s):  
River Basin ◽  
Transient Analysis ◽  
Powder River Basin ◽  
Well Spacing ◽  
Rate Transient Analysis ◽  
Oil Performance ◽  
Reservoir Simulator ◽  
Optimal Cluster

Abstract A seven-step workflow to help subsurface teams establish an initial thesis for optimal completion design (cluster spacing, proppant per cluster) and well spacing in emerging / under-explored resource plays is proposed and executed for the Powder River Basin Niobrara unconventional oil play. The workflow uses Rate Transient Analysis (RTA) to determine the Ac∗k parameter and then walks the reader through how to sequentially decouple the parameter into its constituent parts (frac height (h), number of symmetrical fractures achieved (nf), permeability (k) and fracture half-length (xf)). Once these terms were quantified for each of the case study wells, they were used in a black oil reservoir simulator to compare predicted verses actual cumulative oil performance at 30, 60, 90,120 & 180 days. A long-term production match was achieved using xf as the lone history match parameter. xf verses proppant per effective half-cluster yielded an R2 value of > 0.90. 28 simulation scenarios were executed to represent a range of cluster spacing, proppant per cluster and well spacing scenarios. Economics (ROR and/or NPV10/Net Acre) were determined for each of these scenarios under three different commodity pricing assumptions ($40/$2.50, $50/$2.50 and $60/$2.50). An initial thesis for optimal cluster spacing, proppant per designed cluster and well spacing were determined to be 12’, 47,500 lbs and 8-14 wells per section (based on whether or not fracture asymmetry is considered) when WTI and Henry Hub are assumed to be $50 & $2.50 flat.

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