Evaluating essential features of proppant transport at engineering scales combining field measurements with machine learning algorithms

Hou, Lei; Wang, Xiaoyu; Bian, Xiaobing; Liu, Honglei; Gong, Peibin

doi:10.1016/j.jngse.2022.104768

Cited by 8 publications

(3 citation statements)

References 29 publications

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“…These dunes vary in shape and size as continuous injections progress. Within fractures, the proppant is then transported in the form of these dunes, creating a dynamic and complex process, unlike water-based high-viscosity fluids that evenly suspend the proppant (Hou et al, 2022a;Hou et al, 2022b). When the mass flow remains constant, altering the injection temperature to a higher value or reducing the injection pressure will lead to a decrease in both viscosity and density of supercritical CO 2 , resulting in evolutions of equilibrium height and distance for dune transport, as presented in Figure 4 (Zheng et al, 2022b).…”

Section: Proppant Transport By Comentioning

confidence: 99%

Promotion of CO2 fracturing for CCUS—the technical gap between theory and practice

Hou,

Luo,

Gong

et al. 2024

Front. Energy Res.

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CO2, used as an environmentally friendly fracturing fluid, has encountered a bottleneck in development in recent years. Despite great efforts in research work, limited progress has been made in field applications. In this study, an extensive literature review of research work and field cases was performed to summarize the technical issues and challenges of CO2 fracturing. The key issues of CO2 fracturing were analyzed to reveal the gap between fundamental research and field operations. The effects of CO2 properties on fracture creation and proppant transport were synthetically analyzed to extract new common research orientations, with the aim of improving the efficiency of CO2 injection. The hydraulic parameters of CO2 fracturing were compared with those of water-based fracturing fluids, which revealed a theory-practice gap. By studying the developing trends and successful experiences of conventional fluids, new strategies for CO2 fracturing were proposed. We identified that the major theory-practice gap in CO2 fracturing exists in pump rate and operation scale. Consequently, the friction reducer, effects of flow loss (due to leak-off) and distribution (within fracture networks), and shear viscosity of thickened CO2 are key factors in improving both fracture propagation and proppant transport. By increasing the scale of injected CO2, the CO2 fracturing technique can be enhanced, making it an essential option for carbon capture, utilization, and storage (CCUS) to reduce carbon emissions and mitigate climate change.

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Section: Proppant Transport By Comentioning

confidence: 99%

Promotion of CO2 fracturing for CCUS—the technical gap between theory and practice

Hou,

Luo,

Gong

et al. 2024

Front. Energy Res.

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“…The phase-change behavior reflects the relationship between the time and temperature when the fracturing fluid changes from a liquid to compressible solid . In fact, it is very important to study the phase-change behavior of self-generated proppant fracturing fluids . From the perspective of field application, different formations and different well depths correspond to multiple temperatures.…”

Section: Introductionmentioning

confidence: 99%

“…23 In fact, it is very important to study the phase-change behavior of self-generated proppant fracturing fluids. 24 From the perspective of field application, different formations and different well depths correspond to multiple temperatures. In addition, according to formation temperature field simulation, temperature distribution during the actual fracturing process, and fracture temperature recovery after fracturing, the temperature in the fracture after fracturing will present different distributions.…”

Section: Introductionmentioning

confidence: 99%

Liquid–Solid Phase-Change Autogenous Proppant Fracturing Fluid─Phase-Change Behavior Research and Field Application

Chen,

Sang,

Guo

et al. 2023

Energy Fuels

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Hydraulic fracturing is an important technology for the stimulation of oil and gas reservoirs. In recent years, a new technology called self-generated proppant fracturing that abandons the traditional "sand-carrying" mode has become a research hot spot. This technology can solve many deficiencies and limitations of a conventional fracturing technology, so it has been widely studied by scholars at home and abroad. This article studies the phase-change behavior of the self-generated proppant fracturing fluid system for this new technology, specifically analyzing the effects of temperature, time, and accelerants on the phase-change behavior and conducting on-site applications. The research shows that (1) the phase-change behavior can be divided into three parts: initiation of phase-change, solid production, and pressure-resistant solid formation. Tertiary amines were selected as the best accelerant for the new fracturing fluid system to control the time and temperature of phase-change. (2) The accelerant can reduce the phasechange temperature with a non-linear trend. (3) When the temperature is below 40 °C, the dosage of the accelerant is more than 0.6%; when the temperature is in the range of 40−60 °C, the dosage of the accelerant is about 0.4−0.6%; when the temperature is higher than 80 °C, the accelerant dosage design should be less than 0.2%. (4) Through on-site application, it has been confirmed that the new fracturing fluid system is feasible for normal construction under the existing construction conditions and effective for reservoir transformation. Under the same renovation scale, interval, and production system, the daily gas production of the well (2.23 × 10 4 m 3 /d) which used the new fluid system is higher than the adjacent wells (1.68 × 10 4 m 3 /d) according to production data.

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Prediction of Fracturing Pressure and Parameter Evaluations at Field Practical Scales

Hou,

Zhou,

Elsworth

et al. 2024

Rock Mech Rock Eng

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Evaluating essential features of proppant transport at engineering scales combining field measurements with machine learning algorithms

Cited by 8 publications

References 29 publications

Promotion of CO2 fracturing for CCUS—the technical gap between theory and practice

Promotion of CO2 fracturing for CCUS—the technical gap between theory and practice

Liquid–Solid Phase-Change Autogenous Proppant Fracturing Fluid─Phase-Change Behavior Research and Field Application

Prediction of Fracturing Pressure and Parameter Evaluations at Field Practical Scales

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