An Economic Evaluation on the Re-fracturing Treatment of the U.S. Shale Gas Resources

Eshkalak, Mohammad O.; Aybar, Umut; Sepehrnoori, Kamy

doi:10.2118/171009-ms

Cited by 28 publications

(21 citation statements)

References 23 publications

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“…According to production reports from the Fuling field, staged fracturing is widely used in China and the whole cost for hydraulic fracturing is related to the number of stages (Nfs) [21][22][23]:…”

Section: Cost Componentsmentioning

confidence: 99%

Assessment of Methods for Forecasting Shale Gas Supply in China Based on Economic Considerations

Guo

Yan

Wang³

2017

Energies

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Shale gas, with its lower carbon content and pollution potential, is the most promising natural gas resource in China. When modeling the shale gas supply in a specific gas field, it is of paramount importance to determine the gas supply under economic considerations. Two common calculation methods are used in China for this purpose: Method 1 (M1) is the breakeven analysis, where the gas supply is based on the relationship between costs and revenues, while Method 2 (M2) is the Geologic Resource Supply-Demand Model, where the supply relies on demand and price scenarios. No comparisons has been made between these two methods. In this study, the Fuling shale gas field in the Sichuan Basin was chosen as a study case to forecast the shale gas supply using these two different methods. A sensitivity analysis was performed to discuss the influencing factors of each method and error measures were used to compare the different shale gas supply values calculated by each method. The results shows that M1 is more sensitive to initial production, while M2 is more sensitive to gas price. In addition, M2 is more feasible for its simplicity and accuracy at high price scenarios and M1 is considered to be reliable for low price scenarios with profit. This study can provide a quick and comprehensive assessment method for the shale gas supply in China.

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Section: Cost Componentsmentioning

confidence: 99%

Assessment of Methods for Forecasting Shale Gas Supply in China Based on Economic Considerations

Guo

Yan

Wang³

2017

Energies

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“…On the other hand, refracturing tends to increase the length of the original fractures, which could lead to serious water channeling. In order to achieve an effective development of low permeability wells and stripper wells, and to avoid the reopening of previous fractures, refracturing treatments featuring temporary plugging agent‐fiber for fracturing fluid diversion is widely used in oilfield …”

Section: Introductionmentioning

confidence: 99%

“…In order to achieve an effective development of low permeability wells and stripper wells, and to avoid the reopening of previous fractures, refracturing treatments featuring temporary plugging agent-fiber for fracturing fluid diversion is widely used in oilfield. [17][18][19] In order to study the influencing factors for refracture initiation mechanisms and fracture morphology in refracturing technology using temporary plugging for fluid diversion in tight sandstone reservoirs, we carried out large-scale true triaxial stress tests in condition of different horizontal stress differences and initial fracturing fluid injection rates. Acoustic emission experiments were also conducted to further study the characteristics of refracturing technology using temporary plugging for fluid diversion.…”

Section: Introductionmentioning

confidence: 99%

Study on the mechanisms of refracturing technology featuring temporary plug for fracturing fluid diversion in tight sandstone reservoirs

Zhao

et al. 2018

Energy Science & Engineering

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Well production rates in unconventional plays usually decline dramatically in the first year. Refracturing, which is a remedial production operation, is often done because original hydraulic fracturing failed to contribute any significant amount of flow or significant unfractured pay exists in the well. In order to maximize the fracturing fluid contact with the intact rock and to stimulate more reservoir volume in previously stimulated wells, a refracturing technology featuring a novel temporary plugging for fluid diversion is developed to enable the fracturing fluid to reach the untouched areas and to create reoriented fractures. In this paper, laboratory physical simulation tests of refracturing using fiber for effective temporary plugging is carried out to study the refracture morphology and the influencing factors of refractures. Results show that the refracture morphology is affected by the horizontal stress difference, the injection rate of initial fracturing fluid, and the natural fractures. Under condition of the different horizontal stress differences, the fracture initiation and orientation angle are different. When the horizontal stress difference is small, it is easy to form large angle fractures. The injection rate of initial fracturing fluid affects the length of initial fractures and refractures. The smaller the initial fracturing fluid injection rate is, the better the effect of temporary plugging in refracturing. The presence of natural fractures will lead to reorientation of refractures to form a complex fracture network. This study provides a theoretical guidance and technology support for refracturing operations.

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“…Among these methods, refracturing the horizontal wellbore has several advantages. One of the advantages of this method is that it is cheaper than drilling an offset well under certain circumstances . This makes refracturing an interesting method compared with other options.…”

Section: Introductionmentioning

confidence: 99%

Analysis of refracturing in horizontal wells: Insights from the poroelastic displacement discontinuity method

Rezaei

Bornia

Rafiee³

et al. 2018

Num Anal Meth Geomechanics

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Summary In this paper, a fully coupled 2‐dimensional poroelastic displacement discontinuity method is used to investigate the refracturing process in horizontal wells. One of the objectives of refracturing is to access new reserves by adding new hydraulic fractures in zones that were bypassed in the initial fracturing attempt. Pore pressure depletion in the vicinity of old fractures directly affects the state of stress and eventually the propagation of newly created hydraulic fractures. Thus, a poroelastic analysis is required to identify guidelines for the refracturing process, in particular to understand the extension of the pore pressure depletion, and eventually, the orientation of new as well as old fractures. We propose a fully coupled approach to model the whole process of child fracture propagation in a depleted area between 2 parent fractures in the same wellbore. This approach omits the need of using multistep workflow that is regularly used to model the process. The maximum tensile stress criterion (σ criterion) is used for hydraulic fracture propagation. The proposed method is verified using available analytical solutions for total stress and pore pressure loading modes on a line fracture in drained and undrained conditions. Then, test cases of multifractured horizontal wells are studied to calculate the time evolution of the stress and pore pressure fields around old fractures and to understand the effect of these fields on the propagation path of newly created fractures. Finally, the effect of the pore pressure depletion on the propagation path of the newly created fractures in the bypassed area of the same wellbore is studied. The results show that the depleted areas around old fractures are highly affected by the extent and severity of the stress redistribution and pore pressure depletion. It is observed that a successful creation of new fractures may only happen in certain time frames. The results of this study provide new insights on the behavior of newly created fractures in depleted zones. They also clarify the relationship between stress change and pore pressure depletion in horizontal wells.

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An Economic Evaluation on the Re-fracturing Treatment of the U.S. Shale Gas Resources

Cited by 28 publications

References 23 publications

Assessment of Methods for Forecasting Shale Gas Supply in China Based on Economic Considerations

Assessment of Methods for Forecasting Shale Gas Supply in China Based on Economic Considerations

Study on the mechanisms of refracturing technology featuring temporary plug for fracturing fluid diversion in tight sandstone reservoirs

Analysis of refracturing in horizontal wells: Insights from the poroelastic displacement discontinuity method

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