Successful Application of Hydrajet Fracturing on Horizontal Wells Completed in a Thick Shale Reservoir

East, Loyd E.; Grieser, William Vincent; McDaniel, B.W.; Johnson, Bill; Jackson, Randy; Fisher, Kevin

doi:10.2118/91435-ms

Cited by 41 publications

(48 citation statements)

References 12 publications

(1 reference statement)

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“…For all the wells, the ISIP values increase moving from the toe to the heel in a steady progression, except that there is a fall-off for the last few stages in Wells A, B, and C. A similar effect has been reported in the gas shale literature and explained as a "stress shadow" related to sequential propped planar fractures (East et al, 2004;Fisher et al, 2004;Soliman et al, 2008;Waters et al, 2009).…”

Section: Isip Escalationsupporting

confidence: 79%

Hydraulic Fracturing, Microseismic Magnitudes, and Stress Evolution in the Barnett Shale, Texas, USA

2011

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We present new techniques to analyze the effectiveness of hydraulic fracturing for stimulating production in shale gas reservoirs. The case study we have analyzed involves five parallel horizontal wells in the Barnett shale with 51 frac stages. To investigate the numbers, sizes and types of microearthquakes initiated during each frac stage, we created Gutenberg-Richter-type magnitude distribution plots to see if the size of events follows the characteristic scaling relationship found in natural earthquakes. We found that slickwater fracturing does generate a log-linear distribution of microearthquakes, but that it creates proportionally more small events than natural earthquake sources. Finding considerable variability in the generation of microearthquakes, we have used the magnitude analysis as a proxy for the "robustness" of the stimulation of a given stage. We have found that the conventionally fractured well and the two alternately fractured wells ("zipperfracs") were more effective than the simultaneously fractured wells ("simulfracs") in generating microearthquakes.We also found that the later stages of fracturing a given well were more successful in generating microearthquakes than the early stages. This increase in microearthquake activity in the latter frac stages corresponded with an increase in the instantaneous shut-in pressure (ISIP). The net ISIP increase was most pronounced in the simulfrac wells and least pronounced in the zipperfrac wells. We have attempted to model this increase as a cumulative "stress shadow" using an elastic crack-opening model. However, even the maximum reasonable propped fracture aperture causes a stress increase that is less than what was measured in the wells. Since the fracturing of the simulfrac wells took only half the time of the fracturing of the zipperfrac wells, we believe that poroelastic effects associated with time-dependent leak-off is controlling the rate of ISIP escalation and the increase in microseismic creation. We are incorporating poroelasticity in the model to fully integrate stress evolution and permeable volume creation.

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Section: Isip Escalationsupporting

confidence: 79%

Hydraulic Fracturing, Microseismic Magnitudes, and Stress Evolution in the Barnett Shale, Texas, USA

2011

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“…E. East Jr et al, (2004) system in order to incorporate natural fractures effects in Shale Gas reservoirs. They also considered the decrease of fracture conductivity with the decrease of pore pressure and stress around the hydraulic fracture.…”

Section: Multistage Hydraulic Fracturing In Horizontal Wellsmentioning

confidence: 99%

Stochastic optimization of hydraulic fracture and horizontal well parameters in shale gas reservoirs

Rammay

Awotunde

2016

Journal of Natural Gas Science and Engineering

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“…21 gives the match between the observed and calculated production data. East et al (2004), who indicated that those dimensions had been verified using microseismic monitoring, gave the basic dimensions of the fractures. The total length of the horizontal section is 2120 ft, with 20 transverse fractures intersecting it.…”

Section: Field Examplesmentioning

confidence: 99%

Fracturing unconventional formations to enhance productivity

Soliman

Daal

East

2012

Journal of Natural Gas Science and Engineering

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Successful Application of Hydrajet Fracturing on Horizontal Wells Completed in a Thick Shale Reservoir

Abstract: TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractThe evolution of well completions in the Barnett

Cited by 41 publications

References 12 publications

Hydraulic Fracturing, Microseismic Magnitudes, and Stress Evolution in the Barnett Shale, Texas, USA

Hydraulic Fracturing, Microseismic Magnitudes, and Stress Evolution in the Barnett Shale, Texas, USA

Stochastic optimization of hydraulic fracture and horizontal well parameters in shale gas reservoirs

Fracturing unconventional formations to enhance productivity

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