Optimizing Fracture Stimulation in a New Coalbed Methane Reservoir in Wyoming 
Using Treatment Well Tiltmeters and Integrated Fracture Modeling

Mayerhofer, Michael; Stutz, Lloyd; Davis, Eric; Wolhart, S.L.

doi:10.2523/84490-ms

Cited by 2 publications

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“…The results of this work illustrate the application of microseismic mapping to calibrate fracture models 3,8,9,10,13 and, with the subsequent integration of production and interference data, to improve well placement and field development strategies. The paper also provides recommendations for optimizing future fracture treatment designs and explores different treament types (waterfracs, and linear gel hybrid fracs) and the effect of increasing job sizes.…”

Section: Proposalmentioning

confidence: 81%

Integration of Microseismic-Fracture-Mapping Fracture and Production Analysis With Well-Interference Data To Optimize Fracture Treatments in the Overton Field, East Texas

Mayerhofer¹,

Bolander²,

Williams³

et al. 2005

Proceedings of SPE Annual Technical Conference and Exhibition

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TX 75083-3836, U.S.A., fax 01-972-952-9435. ProposalThis paper discusses the integration of microseismic fracture mapping with fracture engineering, well production results and offset well interference data in the Overton Field, East Texas. Target formation is the Taylor Cotton Valley at depths of about 11,500 ft. The fracturing program in this field included different types of waterfrac and linear gel hybrid frac treatments, which were compared to evaluate the optimal type of fracture design in this area. Detailed production analyses were performed to evaluate well performance in conjunction with fracture geometry measurements provided by microseismic fracture mapping results, calibrated fracture modeling and direct production interference data, which provided interesting insights into effective fracture lengths, reservoir quality, and drainage areas.Microseismic fracture mapping 1,2,4,6,7,14-17 indicated that created fractures are very long. There is compelling evidence that effective hydraulic fracture lengths are also very long, as immediate well interference can be detected in wells that are located along the fracture orientation with very large interwell distances. This means that there is a conductive hydraulic fracture path in place over large distances, with fractures overlapping and linking up wells. One well in this study area was temporarily killed by a fracture treatment in an offset well but production was restored within one day. There was no evidence for a wide fracture network (as has been reported in the Barnett shale), but there may be a small-scale fracture network within a narrow area around the hydraulic fracture.Production modeling indicates that the permeability feeding the long hydraulic fractures (perpendicular to frac) is on average very low as indicated by production modeling. The low permeability and long fractures will create slim "cigarlike" drainage areas that should be taken into consideration for well placement and spacing strategies.The results of this work illustrate the application of microseismic mapping to calibrate fracture models 3,8,9,10,13 and, with the subsequent integration of production and interference data, to improve well placement and field development strategies. The paper also provides recommendations for optimizing future fracture treatment designs and explores different treament types (waterfracs, and linear gel hybrid fracs) and the effect of increasing job sizes.

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Section: Proposalmentioning

confidence: 81%

Integration of Microseismic-Fracture-Mapping Fracture and Production Analysis With Well-Interference Data To Optimize Fracture Treatments in the Overton Field, East Texas

Mayerhofer¹,

Bolander²,

Williams³

et al. 2005

Proceedings of SPE Annual Technical Conference and Exhibition

Self Cite

View full text Add to dashboard Cite

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“…Precision electronics detect changes in resistivity between electrodes mounted on the sensor that are caused by repositioning of the gas bubble. So the deformation induced by hydraulic fracture can be measured with surface tilemeters ( 6,7,8 ) . The tilt vectors include the information in connection with hydraulic fracture azimuth and shape.…”

Section: Principle and Methods Of Tiltmeter Fracture Mappingmentioning

confidence: 99%

A New Method to Interpret Hydraulic Fracture Complexity in Unconventional Reservoir by Tilt Magnitude

et al. 2013

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Hydraulic fractures in unconventional reservoir are complex. Surface tilemeter fracture mapping method is used to obtain ground deformation field caused by hydraulic fracture. The observed and theoretical fracture-induced tilt vectors from a best-fit fracture solution are compared and obtain hydraulic fracture orientation and shape. Through analysis of the vertical and horizontal component volume, three new parameters are given to characterize the fracture complexity, i.e. ratio of fluid volume to fracture volume R; volume weight difference rate D and fracture complexity index β. These new parameters are used to explain the mapping result of shale and coal seam reservoir. The results show that R of coal bed and shale is 2.2 and 2.9 while sandstone is only 1.4. β of shale, coal bed and sandstone are 0.7,0.4 and 0.3 respectively, the two new parameters show hydraulic fractures in unconventional reservoir are very complex. The new parameters can describe fracture complexity very well, and results are correlated well with the results of fracturing pressure analysis and other methods of monitoring. This method provides valuable information for optimizing fracturing treatment design and postfrac evaluation in unconventional reservoir. Keywords:Hydraulic fracture complexity; tilt magnitude; ratio of fluid volume to fracture volume; fracture complexity index; unconventional reservoir Background As shale gas and shale oil are developed successfully, unconventional oil and gas resources have attracted more attention. Currently, the unconventional oil and gas production worldwide is mainly from the coalbed methane, shale gas, shale oil. All these resources must be stimulated by hydraulic fracturing in order to achieve economic production rates. However the hydraulic fractures in these reservoirs become very complicated due to the unconventional reservoir lithology and mechanical properties (1) , and the TX 75083-3836, U.S.A., fax +1-972-952-9435

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Optimizing Fracture Stimulation in a New Coalbed Methane Reservoir in Wyoming Using Treatment Well Tiltmeters and Integrated Fracture Modeling

Cited by 2 publications

References 0 publications

Integration of Microseismic-Fracture-Mapping Fracture and Production Analysis With Well-Interference Data To Optimize Fracture Treatments in the Overton Field, East Texas

Integration of Microseismic-Fracture-Mapping Fracture and Production Analysis With Well-Interference Data To Optimize Fracture Treatments in the Overton Field, East Texas

A New Method to Interpret Hydraulic Fracture Complexity in Unconventional Reservoir by Tilt Magnitude

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