Abstract
Abstract
The Haynesville-Bossier (HB) Shale is an extensive gas resource that has received significant publicity over the past two years, and is currently being developed by numerous operators. Since the HB is a relatively new play, it is anticipated that there will be many learnings in the future that will further improve well completions. However, the more quickly datasharing and adoption of best practices occurs, the more effectively this tremendous resource will be developed.
This paper will describe some of the reservoir and completion concerns that have driven this operator's current completion philosophy, particularly as they affect well stimulation. Some of the topics described in the paper include:Consideration of vertical and horizontal wellboresHorizontal lateral placement within the vertical pay sectionOrientation of wellbores with respect to anticipated fracture azimuthFracture stage isolation considerationsPerforation strategyDesign and implementation of hydraulic fracture treatmentsConsiderations to accommodate elevated temperatures and stresses in the frac designManagement of closure stresses on proppant
Hydraulic fractures are the key to unlock the potential of most low permeability shale reservoirs such as the Haynesville Shale, and many drilling and completion decisions must be made to ensure successful placement of the stimulation treatment. Although the approach used on initial wells is expected to evolve with future experimentation and optimization, it is hoped that this early discussion of current design philosophy will be useful to the SPE audience, and allow the industry to optimize their Haynesville completions in a timelier manner.
Introduction
In April of 2004, the vertical Elm Grove Plantation #15 was drilled through the Haynesville-Bossier (HB) Shale and experienced significant gas shows. Several additional vertical wells were drilled in 2005–2007 by various operators in the play, including the Adcock #1 in which core was retrieved from the interval. This core allowed further analysis and evaluation of the play, and land positions were assembled with little notoriety. However, in December 2007, the first horizontal well was drilled in the HB Shale, the SLRT #2, with reported initial production (IP) of 2.6 MMcfd. Over the next several months various operators made announcements on their views of the play and the land rush ensued. Leasing costs quickly jumped and by mid-2008, lease costs were exceeding $25,000/acre with 25–30% royalty.
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