Dominating factors on well productivity and development strategies optimization in Weiyuan shale gas play, Sichuan Basin, SW China

Ma, Xiaobin; Li, Xizhe; Liang, Feng; Wan, Yong; Shi, Qiang; Wang, Yonghui; Zhang, Xiaowei; Che, M.; Guo, Wei

doi:10.1016/s1876-3804(20)60076-3

Cited by 66 publications

(30 citation statements)

References 10 publications

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“…The reservoir properties are generally high, with total organic carbon (TOC) value of 2.1-8.1% and average of 3.2%, porosity of 2.1-9.6% and average of 5.9%, brittle mineral content of 60-82% and average of 74%, gas content of 3.3-8.5 m 3 /t and average of 5.5 m 3 /t. The shale gas play is characterized by small thickness (1-7 m and an average of 3.8 m) of high-quality reservoir, large horizontal stress difference (7.7-18.7 MPa) (Ma et al 2020;Liu et al2021).…”

Section: Introductionmentioning

confidence: 99%

Shale gas well productivity potential evaluation based on data-driven methods: case study in the WY block

Tan

Hanwen

Song³

et al. 2022

J Petrol Explor Prod Technol

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Evaluating the productivity potential of shale gas well before fracturing reformation is imperative due to the complex fracturing mechanism and high operation investment. However, conventional single-factor analysis method has been unable to meet the demand of productivity potential evaluation due to the numerous and intricate influencing factors. In this paper, a data-driven-based approach is proposed based on the data of 282 shale gas wells in WY block. LightGBM is used to conduct feature ranking, K-means is utilized to classify wells and evaluate gas productivity according to geological features and fracturing operating parameters, and production optimization is realized through random forest. The experimental results show that shale gas productivity potential is basically determined by geological condition for the total influence weights of geologic properties take the proportion of 0.64 and that of engineering attributes is 0.36. The difference between each category of well is more obvious when the cluster number of well is four. Meanwhile, those low production wells with good geological conditions but unreasonable fracturing schemes have the greatest optimization space. The model constructed in this paper can classify shale gas wells according to their productivity differences, help providing suggestions for engineers on productivity evaluation and the design of fracturing operating parameters of shale gas well.

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Section: Introductionmentioning

confidence: 99%

Shale gas well productivity potential evaluation based on data-driven methods: case study in the WY block

Tan

Hanwen

Song³

et al. 2022

J Petrol Explor Prod Technol

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“…Low-permeability to ultralow-permeability reservoirs have significant development potential. The China National Petroleum Corporation (CNPC) has focused on such reservoirs to increase reserves and facilitate the production of crude oil in the ongoing and coming years (Hu, 2009;Ma et al, 2020;Zou et al, 2010). According to data collected in 2006, the CNPC's annual proven low-permeability (overburden matrix permeability is less than 50 Â 10 À3 mm 2 ) reserves contain 430 million tons of crude oil, accounting for 71.8% of China's annual proven low-permeability reserves.…”

Section: Introductionmentioning

confidence: 99%

Reservoir characteristics and effective development technology in typical low-permeability to ultralow-permeability reservoirs of China National Petroleum Corporation

Yang

Li³

et al. 2021

Energy Exploration & Exploitation

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Low-permeability to ultralow-permeability reservoirs of the China National Petroleum Corporation are crucial to increase the reserve volumes and the production of crude oil in the present and future times. This study aimed to address the two major technical bottlenecks faced by the low-permeability to ultralow-permeability reservoirs by a comprehensive use of technologies and methods such as rate-controlled mercury injection, nuclear magnetic resonance, conventional logging, physical simulation, numerical simulation, and field practices. The reservoir characteristics of low-permeability to ultralow-permeability reservoirs were first analyzed. The water flooding development adjustment mode in the middle and high water-cut stages for the low-permeability to ultralow-permeability reservoirs, where water is injected along the fracture zone and lateral displacement were established. The formation mechanism and distribution principles of dynamic fractures, residual oil description, and expanding sweep volume were studied. The development mode for Type II ultralow-permeability reservoirs with a combination of horizontal well and volume fracturing was determined; this led to a significant improvement in the initial stages of single-well production. The volume fracturing core theory and optimization design, horizontal well trajectory optimization adjustment, horizontal well injection-production well pattern optimization, and horizontal well staged fracturing suitable for reservoirs with different characteristics were developed. This understanding of the reservoir characteristics and the breakthrough of key technologies for effective development will substantially support the oil-gas valent weight of the Changqing Oilfield to exceed 50 million tons per year, the stable production of the Daqing Oilfield with 40 million tons per year (oil-gas valent weight), and the realization of 20 million tons per year (oil-gas valent weight) in the Xinjiang Oilfield.

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“…Shale reservoirs integrate gas sources and storage and are characterized by low porosity and low permeability. 1,2 Pore channels and microfractures at the nanometer to micron scale are widely developed in such reservoirs. During the development process of shale gas reservoirs, cross-scale gas immigration may show multiple flow effects.…”

Section: ■ 1introductionmentioning

confidence: 99%

“…Shale gas is a natural gas that is self-generated and then self-stored in dark mud shale and carbonaceous shale. Shale reservoirs integrate gas sources and storage and are characterized by low porosity and low permeability. , Pore channels and microfractures at the nanometer to micron scale are widely developed in such reservoirs. During the development process of shale gas reservoirs, cross-scale gas immigration may show multiple flow effects. , The classic Darcy seepage theory is no longer applicable, and the impact of gas diffusion on the flow process cannot be ignored, being the key factor determining later the gas well performance .…”

Section: Introductionmentioning

confidence: 99%

Apparent Diffusion Coefficient of Gas in Shale Reservoirs and Insights into Its Diffusion Behavior: A Modeling and Experimental Study

Duan

Yao

et al. 2021

Energy Fuels

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Diffusion plays an important role in gas production from a shale matrix. To determine the gas diffusion mechanism in micro-/nanopores and to tackle the difficult problem of the quantitative description of the gas diffusion capacity in shale reservoirs, a differential momentum equation considering fluid viscosity is derived, and an apparent diffusion coefficient model considering shale porosity, tortuosity, and Knudsen number is built. The diffusion ability testing experiment carried out to verify the reliability of the proposed model is created by our research group. The results indicate that the new apparent diffusion coefficient better captures the diffusion capacity of shale gas owing to the consideration of the aforementioned key parameters. The apparent diffusion coefficient is negatively correlated with pressure but positively correlated with the pore diameter. For the nD permeability reservoirs when the average reservoir pressure is less than 5 MPa, the contribution of diffusion to the flow rate is more than 80%. In summary, the quantitative calculation of shale gas diffusion flow under given reservoir conditions and the understanding of the contribution of diffusion to flow at different stages can be achieved with the proposed diffusion model. Scientific foundations for timely production system adjustment and single-well yield enhancement are, thereby, expected to be laid.

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Dominating factors on well productivity and development strategies optimization in Weiyuan shale gas play, Sichuan Basin, SW China

Cited by 66 publications

References 10 publications

Shale gas well productivity potential evaluation based on data-driven methods: case study in the WY block

Shale gas well productivity potential evaluation based on data-driven methods: case study in the WY block

Reservoir characteristics and effective development technology in typical low-permeability to ultralow-permeability reservoirs of China National Petroleum Corporation

Apparent Diffusion Coefficient of Gas in Shale Reservoirs and Insights into Its Diffusion Behavior: A Modeling and Experimental Study

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