Ten years of gas shale fracturing in China: Review and prospect

Zhao, Jinzhou; Ren, Lei; Jiang, Tingxue; Hu, Dongfeng; Wu, Lei; Wu, Jianfa; Yin, Chuancun; Li, Yongming; Hu, Yongquan; Lin, Ran; Li, Yong; Peng, Yu; Shen, Cheng; Chen, Xiyu; Yin, Q. Z.; Jia, Chengzao; Song, Yujia; Wang, Haitao; Li, Zhaoyuan; Wu, Jianjun; Zeng, Bin; Du, Lei

doi:10.1016/j.ngib.2022.03.002

Cited by 45 publications

(17 citation statements)

References 23 publications

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“…In recent years, hydraulic fracturing technology has been the key reservoir stimulation technology (Zhao et al, 2018;Zhao et al, 2022). Fracture network fracturing has proven to be an effective technology for the development of tight shale reservoirs (Ren et al, 2017;Ren et al, 2018;Ren et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Modeling and analysis of hydraulic fracture complexity index in sandy conglomerate reservoirs based on genetic expression programming—A case study in Xinjiang Oilfield

Zhang

Wang

et al. 2023

Front. Earth Sci.

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The stimulation effect of oil wells is seriously affected by the complexity of hydraulic fractures, and the analysis of the factors that control the fracture complexity index has become the key to fracturing design in sandy conglomerate reservoirs. Based on the intrinsic relationship between geological engineering parameters and the fractures complexity index, a Genetic Expression Programming (GEP) method, which has broad advantages in solving multi-factor nonlinear fitting and black-box prediction problems, is proposed to analyze the hydraulic fracture complexity index. Combined with the geoengineering factors that affect the hydraulic fractures propagation, a comprehensive index calculation method is established to analyze the relative importance of these features and 18 reconstructed features were obtained by collecting the geoengineering parameter data of 118 fracturing sections in 8 fracturing wells in Jinlong oilfield. The principal component analysis was performed to eliminate the interaction between the features, and then a GEP-based fractures complexity index calculation model was developed. The partial dependence plot is used to analyze the influence of the main control feature (variable) on the hydraulic fracture complexity index. It showed that GEP model can achieve satisfactory performance (Training set: R = 0.861; Test set: R = 0.817) by statistical parameters. The results showed that the model can calculate the hydraulic fracture complexity index quickly and precisely. The influence of geological engineering control factors can be obtained. It proved that the GEP method can effectively analyze and evaluate the complexity in sandy conglomerate reservoirs.

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Section: Introductionmentioning

confidence: 99%

Modeling and analysis of hydraulic fracture complexity index in sandy conglomerate reservoirs based on genetic expression programming—A case study in Xinjiang Oilfield

Zhang

Wang

et al. 2023

Front. Earth Sci.

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“…China's proven shale gas reserves are comparable to those of the United States, and the third shale gas industry has formed after the United States and Canada. However, the current output of shale gas is only 2.7% of that of the United States, and it has tremendous development potential [1] . Downhole tubing is the most important equipment in the process of shale gas exploitation, and its safety guarantee is the premise of the normal production of the shale gas field.…”

Section: Introductionmentioning

confidence: 99%

Corrosion Analysis of Shale Gas Downhole Tubing Under the Synergistic Action of Multiple Factors

Sun¹,

Cui²,

Lin³

2023

J. Phys.: Conf. Ser.

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The downhole tubing of a shale gas block in our southwest region has been corroded to varying degrees, which has led to perforation failure, seriously affecting the normal production of gas wells, and at the same time, there are great potential safety hazards. To clarify the corrosion type and corrosion mechanism, the corrosion analysis research of downhole tubing was carried out. The research methods mainly include corrosion morphology observation, corrosion product analysis, and fluid mechanics calculation. The results show that the corrosion under the synergistic effect of scouring-CO2-SRB (Sulfate-Reducing Bacteria)-Cl-is the main corrosion type of downhole tubing in shale gas and scouring that causes damage to the pipe wall in the early stage of operation. These locations are suitable for SRB growth and enrichment, and SRB corrosion causes local corrosion: with the addition of the bactericide, the SRB corrosion stops. At this time, CO2 corrosion continues to develop at the local corrosion position that has been formed. Although it is in the CO2 corrosion insensitive range and the corrosion inhibitor is added, the formed corrosion pit makes the pre-film difficult, it is difficult to guarantee the corrosion inhibition effect. Therefore, SRB corrosion is the main corrosion in the downhole pipe section in the early stage, and CO2 corrosion is the main corrosion in the later stage. Fluid scouring such as liquid sand and gas sand and Cl- promote the occurrence and development of related corrosion.

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“…The accumulation of flowback fluid and formation water brings accumulated-fluid corrosion to the production stage. In addition, a large number of SRB bacteria carried by flowback fluid and formation water and CO 2 carried by shale gas lead to a complex corrosion mechanism of the gathering and transportation pipelines for shale gas [1] . At present, internal corrosion perforations frequently occur in gathering and transportation pipelines of sizable shale gas fields in China [2] .…”

Section: Introductionmentioning

confidence: 99%

Corrosion Mechanism of Typical Shale Gas Gathering and Transportation Pipelines in Southwest China

Sun,

Cui,

Lin

2023

J. Phys.: Conf. Ser.

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The shale gas surface gathering and transportation pipeline in southwest China has experienced serious internal corrosion, which affects the production of shale gas wells and has great potential safety hazards. To find out the corrosion type and corrosion mechanism, the corrosion analysis and mechanism research of gathering and transportation pipelines are carried out, including corrosion morphology observation, corrosion product analysis, fluid mechanics calculation, etc. The results show that the corrosion products of the gathering and transportation pipeline are mainly FeCO3 with high S content, and the corrosion type is sulfate-reducing bacteria (SRB) and CO2 corrosion. At the same time, the corrosion pits are mainly distributed on the approach stream side, which is closely related to the scouring effect of the medium flow in the vertical branch pipe on the wall surface of the tee. The corrosion weight loss test shows that the corrosion rate of sterile solution is significantly lower than that of bacterium solution, indicating that the presence of SRB significantly expedites the corrosion of materials.

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Ten years of gas shale fracturing in China: Review and prospect

Cited by 45 publications

References 23 publications

Modeling and analysis of hydraulic fracture complexity index in sandy conglomerate reservoirs based on genetic expression programming—A case study in Xinjiang Oilfield

Modeling and analysis of hydraulic fracture complexity index in sandy conglomerate reservoirs based on genetic expression programming—A case study in Xinjiang Oilfield

Corrosion Analysis of Shale Gas Downhole Tubing Under the Synergistic Action of Multiple Factors

Corrosion Mechanism of Typical Shale Gas Gathering and Transportation Pipelines in Southwest China

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