Understanding the Complexity of Fracturing in the Sichuan Shale Gas Reservoir in China

Liu, Yuan; Kalinin, D. A.; Li, Deqi; Jiao, Yajun; Li, Ran

doi:10.15530/ap-urtec-2019-198248

Cited by 12 publications

(1 citation statement)

References 14 publications

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“…Belonging to the deep high-temperature and high-pressure reservoir, the burial depth of the Lower Cretaceous Qingshuihe Formation in the Gao Tan No.1 well is 5768-5775 m, the reservoir temperature is 139.58 °C, the original formation pressure is 134.00 MPa, and the lithology is mainly sandstone and sand conglomerate (Jin et al, 2019;Mao et al, 2020). For the effective development of ultra-deep wells, well drilling (Feng et al, 2016;Zhuo et al, 2020), fracturing treatment (Li et al, 2012;Liu et al, 2012;Li et al, 2007), and production system (Du et al, 2020) are facing great challenges. The ultimate goal of the stimulation is to provide long-term effective hydraulic fractures, to which the key lies in the effective support of proppant adapted to the high closure pressure and high temperature of the reservoir.…”

Section: Introductionmentioning

confidence: 99%

Research on Proppant Optimization and Field Test of Ultra-Deep Tight Conglomerate Sandstone Reservoir

Xiao

Kong

et al. 2022

Front. Energy Res.

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Efficient development of deep tight reservoirs in the southern margin of the Junggar Basin requires stimulation technology, and effective propped hydraulic fractures are the key to successful stimulation. To optimize the proppant selected for reservoir stimulation, the important parameters of proppant selection were determined through the proppant conductivity evaluation experimental study and field test, considering the influences of high temperature and high closure pressure. The results show that closure pressure, temperature, and sand concentration have a great influence on the conductivity of the proppant pack. The conductivity of the proppant pack decreases by about 10% at high temperatures, which is because the high temperature will rupture more proppant and thus reduce proppant pack permeability. In the long term, the Scenario B placement pattern can maintain high conductivity, and the long-term conductivity is increased by 6–26% compared with the Scenario C placement pattern. Furthermore, increasing the proppant placement concentration is conducive to the long-term conductivity of the fracture. During the operation of the test well, the treatment pressure was stable, and the fractures were effectively propped. No proppant flowing back occurred in the test production after the fracturing treatment, which achieved the purpose of the evaluation well, provided support for the large-scale development of subsequent development wells, and ensured orderly development.

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Section: Introductionmentioning

confidence: 99%

Research on Proppant Optimization and Field Test of Ultra-Deep Tight Conglomerate Sandstone Reservoir

Xiao

Kong

et al. 2022

Front. Energy Res.

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Parent–Child Well Spacing Optimization in Deep Shale Gas Reservoir with Two Complex Natural Fracture Patterns: A Sichuan Basin Case Study

Pei

Wu²,

Chang³

et al. 2022

Transp Porous Med

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Utilizing Surface Microseismic Monitoring to Improve Understanding of Natural Fractures in Sichuan Shale Gas Play

Jing

Chen²,

Jing

et al. 2020

SPE Asia Pacific Oil &Amp; Gas Conference and Exhibition

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The highly complex geology of the Sichuan Shale gas play, especially in relation to natural fracture systems at different scales, affects the hydraulic completion efficiency and performance. Ant-tracking-based workflows and borehole image data are regularly used to optimize completion campaigns, but bridge-plug-stuck and screen-out risks are still high. The lack of sufficient understanding and accurate identification of the natural fracture systems are the major challenges to address these engineering risks. Surface microseismic monitoring campaigns were conducted over several wells of the Changning field, Sichuan Basin, China. The surface receivers were placed in a radial pattern to record microseismicity generated by hydraulic fracturing. The failure mechanism of all mapped microseismic events (i.e., strike, dip, rake, etc.) was extracted using a moment tensor inversion (MTI) method. Improved understanding of the natural fracture systems and their influence during the hydraulic fracturing process has been achieved by integrating the regional geological data, pumping data and MTI results. Several hydraulic fracturing cases that stimulated near natural fracture systems were investigated. The microseismic monitoring results show that (i) most of the hydraulically induced fractures located in the vicinity of the natural facture or fault did not propagate along the regional maximum stress direction, (ii) the bridge plug got stuck and (iii) screen-out happened frequently in these areas. Moment tensor inversion reveals that (i) the dominant failure mechanism of the natural fractures different from hydraulically induced fractures, (ii) more than one group of natural fractures develop along different directions. Real-time adjustments of the pumping schedule and bridge-plug settings were conducted to reduce engineering risks based on the improved understanding of natural fractures, which proved effective. The innovation of using surface microseismic monitoring results to improve understanding of natural fractures and reduce the engineering risks in real time represents a key step forward to mitigate natural fracture influence and improve the effectiveness of stimulation.

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Understanding the Complexity of Fracturing in the Sichuan Shale Gas Reservoir in China

Cited by 12 publications

References 14 publications

Research on Proppant Optimization and Field Test of Ultra-Deep Tight Conglomerate Sandstone Reservoir

Research on Proppant Optimization and Field Test of Ultra-Deep Tight Conglomerate Sandstone Reservoir

Parent–Child Well Spacing Optimization in Deep Shale Gas Reservoir with Two Complex Natural Fracture Patterns: A Sichuan Basin Case Study

Utilizing Surface Microseismic Monitoring to Improve Understanding of Natural Fractures in Sichuan Shale Gas Play

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