Analysis of Stimulation Effectiveness in the Ammo Field Granite Wash Based on 
Reservoir Characterization &amp; Completion Database

Strickland, Bill; Purvis, Don; Cox, Stuart; Brinska, John; Barree, R.D.

doi:10.2523/80893-ms

“…The positive effects of sand control, proppant packing, and fines migration control have been proven in other publications. 11,12 The synergy of these materials in lowpermeability, high capillary pressure reservoirs has shown to be a winning combination for improved fluid load recovery and sustained increased production.…”

Section: Discussionmentioning

confidence: 99%

Enhancing and Sustaining Well Production - Granite Wash, TX Panhandle

Ingram¹,

Rothkopf²,

Stevenson³

et al. 2007

Proceedings of Production and Operations Symposium

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fax 01-972-952-9435. AbstractThis paper will describe the ongoing Granite Wash completion project in the Buffalo Wallow field in Hemphill and Wheeler Counties, Texas. This study will discuss the reservoir development and characteristics, current and former completion techniques, and production comparisons. The goal for this study is to use best practices gained from a statistical analysis and new chemical technologies for completion procedures in the Granite Wash project utilizing a permeability core testing apparatus for optimized regained permeability in fracturing fluids.Surface modification agents (SMAs) and their coating onto proppant have been applied in treatments of thousands of wells in the last 10 years and have undeniably improved their productivity in terms of production rates and duration. The coating of these SMA materials has been found to dramatically enhance the recovery of aqueous-based fracturing fluids during well cleanup after fracturing treatments. As a result, a significant improvement in gas production has been observed in treated wells. Friction-reduction polymer antiflocculants have been developed to reduce the tendency of these polymers to damage the proppant pack/reservoir interface, resulting in a decreased effective fracture length. A nonionic, micro-emulsion surfactant has been developed to reduce capillary pressure in producing hydraulic fractures via surface tension reduction and contact angle modification. These chemicals have been used in various combinations; the field results as well as testing results will be presented.A patented low-permeability core testing apparatus has tested two granite wash core samples from the Buffalo Wallow field for regained permeability using frictionreduction polymer anti-flocculants, SMAs (specifically diagenesis protective agents), and micro-emulsion surfactants. In addition, basic water-frac additive packages have been applied to continue the optimization of water fracs in the Texas Panhandle to increase long-term natural gas production.The data from those tests and field case histories will be discussed.

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Granite Wash Field Study—Buffalo Wallow Field, Texas Panhandle

Ingram

¹

,

Paterniti

²

,

Rothkopf³

et al. 2006

SPE Eastern Regional Meeting

6

0

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One of the major producing zones in the Texas panhandle is the Granite Wash. The Granite Wash play is currently focused on Wheeler and Hemphill counties on the Oklahoma border and covers more than 1,000 sq mi of tight-sand formations. The focus is less on discovery and more on cost reduction in drilling and stimulating wells. The Texas Railroad Commission in some cases has lowered spacing to 40 or 20 acres per well, which, along with steadily high gas prices, form the basis of the high rig count working in the region. Because of the lack of concise and consistent nomenclature in the Granite Wash plays of the Anadarko Basin, this case study addresses the stimulation trends the industry is using in the Wash play. The target area of this study consists of three counties located in the Texas Panhandle: Wheeler, Hemphill, and Roberts, with extensive data only within the Buffalo Wallow Field. This paper discusses the reservoir development and characteristics, current and former completion techniques, and production comparisons. The goal for this study is to determine best practices for completion procedures in the Granite Wash. Previous satabases1 have been expanded using detail data on fracture treatments performed and production recorded from 135 wells over the given period from 2002 through early 2006. The operator and service provider are currently analyzing the data. The goals of this analysis are to (1) define basic criteria (rules of thumb)2 for optimizing the potential for the highest initial production and 90-day cumulative production, and (2) discover correlations, if any exist. The data of interest reside in each well's specific fracture treatment data that includes the following, but is not limited to treatment rate, proppant volume, treating fluid volume, gross pay interval, net pay interval, proppant mesh size, and treating pressure. One example of the correlations obtained is: based only on rate, if the treatment is pumped at a minimum of 100 bbl/min, a good well will be achieved 66.7% of the time versus 55.2% when the treatment is pumped below 100 bbl/min. When the production criterion is 60-day cumulative production, the gap lessens: 65.6% when the treatment rate is over 100 bbl/min; 60.7% when the treatment rate is less then 100 bbl/min. Many other correlations regarding perforated interval, treatment volume, proppant mass, proppant sieve size, etc. are presented in this paper. Introduction Currently there are many questions revolving around the Granite Wash play and the "best" way to gain economic production from it. The play is expanding to cover more than six counties in Oklahoma and Texas along the Oklahoma-Texas border (Fig. 1). Do we waterfrac these wells? Will low proppant concentrations and hence, low conductivities give us long-term production and adequately drain each section effectively? This paper asks and answers questions regarding fluid volumes, proppant type, mass, and concentrations, and correlates the answers to production, given a tight geographic local (the Buffalo Wallow Field), to determine a best practice to be used in the field. Geology A target reservoir in this basin, the Pennsylvanian Granite Wash, was deposited in a series of alluvial fans and fan deltas that formed rims around these structural highs that developed during the Pennsylvanian Period in response to major continental collision associated with the Ouachita Orogeny.3 Conversely, units of early Paleozoic age (older than the Granite Wash) were deposited on a stable, shallow shelf periodically covered by epicontinental seas. Eventually erosion of the basement uplifts led to their planation and burial, which was followed by deposition of a series of Permian-age red-bed and evaporite facies. These evaporites form the top seal for the Granite Wash. As shown in Fig. 2, a wide geographic distribution of washes exists. These Middle Pennsylvanian washes were sourced from the Amarillo uplift, distributed throughout time. There is also an evident change in "wash" composition; early washes (Morrowan) are typically chert. Atokan washes vary from chert to carbonate, Lower and Middle Cherokee washes are typically carbonate. Red Fork washes are commonly carbonate washes with granitic material found within and controlled by local drainage areas during deposition.

show abstract

Enhancing and Sustaining Well Production: Granite Wash, Texas Panhandle

Ingram

¹

,

Rothkopf

²

,

Stevenson

³

et al. 2007

Production and Operations Symposium

View full text Add to dashboard Cite

fax 01-972-952-9435. AbstractThis paper will describe the ongoing Granite Wash completion project in the Buffalo Wallow field in Hemphill and Wheeler Counties, Texas. This study will discuss the reservoir development and characteristics, current and former completion techniques, and production comparisons. The goal for this study is to use best practices gained from a statistical analysis and new chemical technologies for completion procedures in the Granite Wash project utilizing a permeability core testing apparatus for optimized regained permeability in fracturing fluids.Surface modification agents (SMAs) and their coating onto proppant have been applied in treatments of thousands of wells in the last 10 years and have undeniably improved their productivity in terms of production rates and duration. The coating of these SMA materials has been found to dramatically enhance the recovery of aqueous-based fracturing fluids during well cleanup after fracturing treatments. As a result, a significant improvement in gas production has been observed in treated wells. Friction-reduction polymer antiflocculants have been developed to reduce the tendency of these polymers to damage the proppant pack/reservoir interface, resulting in a decreased effective fracture length. A nonionic, micro-emulsion surfactant has been developed to reduce capillary pressure in producing hydraulic fractures via surface tension reduction and contact angle modification. These chemicals have been used in various combinations; the field results as well as testing results will be presented.A patented low-permeability core testing apparatus has tested two granite wash core samples from the Buffalo Wallow field for regained permeability using frictionreduction polymer anti-flocculants, SMAs (specifically diagenesis protective agents), and micro-emulsion surfactants. In addition, basic water-frac additive packages have been applied to continue the optimization of water fracs in the Texas Panhandle to increase long-term natural gas production.The data from those tests and field case histories will be discussed.

show abstract

Analysis of Stimulation Effectiveness in the Ammo Field Granite Wash Based on Reservoir Characterization & Completion Database

Cited by 3 publications

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Enhancing and Sustaining Well Production - Granite Wash, TX Panhandle

Enhancing and Sustaining Well Production - Granite Wash, TX Panhandle

Granite Wash Field Study—Buffalo Wallow Field, Texas Panhandle

Enhancing and Sustaining Well Production: Granite Wash, Texas Panhandle

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