Electricity generation and heating potential from enhanced geothermal system in Songliao Basin, China: Different reservoir stimulation strategies for tight rock and naturally fractured formations

Zhang, Yanjun; Guo, Liangliang; Li, Zhengwei; Yu, Ziwang; Xu, Tianfu; Chengyu, Lan

doi:10.1016/j.energy.2015.10.059

Cited by 51 publications

(21 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, the competition between volume and pressure with respect to temperature contributes to the three stages of variation characteristics of the late Indogranodiorite. A transition region existed with a very wide variation range (12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22)(23) MPa for the intact sample), and this can be explained by the anisotropic rock components.…”

Section: Influence Of Temperature and Effective Stress On Rockmentioning

confidence: 99%

“…Accurately obtaining the rock parameters is the key factor to obtain the accurate simulation results. However, in most of current simulations, the rock parameters are assumed to be constant [19,20,[22][23][24]. However, during the exploitation of deep geological resources, parameters of the rock, such as rock bulk modulus and Biot coefficient, will change due to the change of temperature and pressure, thus leading to the numerical simulation results deviate from the true value if we ignore these features [25].…”

Section: Introductionmentioning

confidence: 99%

“…The late Indo-granodiorite was selected for the investigation, because it is similar to the geothermal reservoir rock found in China's first hot dry rock target area, specifically, the Gonghe Basin of Qinghai. More importantly, the lithology of reservoir rock in most dry-hot rock sites in the world is granite or granodiorite [19][20][21][22][23]27]. Therefore, the rock used in this experiment is very representative.…”

Section: Introductionmentioning

confidence: 99%

“…Numerical simulation is an important technical means for studying and predicting the engineering problem of carbon dioxide geological reservoirs, nuclear waste disposal, dry rock development, and other deep rock mechanics problems [19][20][21][22][23]. Accurately obtaining the rock parameters is the key factor to obtain the accurate simulation results.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Thermomechanical Behavior of Late Indo-Chinese Granodiorite under High Temperature and Pressure

Zhang

Hao

Bai

et al. 2018

Journal of Engineering

View full text Add to dashboard Cite

This study investigates the influence of temperature, effective stress, and rock fracture on the bulk modulus and Biot's coefficient of granodiorite from a hot dry rock geothermal reservoir using the triaxial compression test. Three types of representative granodiorite samples were chosen for comparative experiments. The experiments were conducted with 0-55 MPa effective stress under cyclic loading. Results show that bulk modulus can continuously increase with the increase in effective stress at a constant temperature. The influencing law on Biot's coefficient is opposite that on bulk modulus. Interestingly, the temperature effects on the drained bulk modulus and Biot's coefficient depend on the effective stress. With regard to rock fractures, temperature and effective stress exert similar effects on the Biot's coefficients and bulk moduli of the samples compared with those of intact rock. The data of this experiment have a wide range of applications because most of the reservoir rocks in dry-hot-rock geothermal system have lithology of granite or granodiorite. The change law of rock modulus and Biot's coefficient with the temperature and pressure in this experiment provide the data basis for the future simulation calculation making the considered factors more comprehensive and the results closer to the real situation.

show abstract

Section: Influence Of Temperature and Effective Stress On Rockmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Thermomechanical Behavior of Late Indo-Chinese Granodiorite under High Temperature and Pressure

Zhang

Hao

Bai

et al. 2018

Journal of Engineering

View full text Add to dashboard Cite

show abstract

“…The development of geothermal reservoirs usually encounters highly permeable formations that are either naturally fractured or created through stimulation operations [1][2][3]. To control the loss of drilling fluids, these fractures must be plugged during drilling and reopened for production when the drilling is completed.…”

Section: Introductionmentioning

confidence: 99%

Polylactic Acid Improves the Rheological Properties, and Promotes the Degradation of Sodium Carboxymethyl Cellulose-Modified Alkali-Activated Cement

et al. 2016

View full text Add to dashboard Cite

Abstract:In consideration of the insolubility in water, sensitivity to heat and wide application in the oil and gas industry as a degradable additive, this paper introduces polylactic acid (PLA) to a self-degradable temporary sealing material (SDTSM) to investigate its effect on the SDTSM performance and evaluate its potential to improve the rheological properties and further promote the self-degradation of the material. The thermal degradation of PLA, the rheological properties, compressive strength, hydrated products and water absorption of SDTSMs with different PLA dosages were tested. The analysis showed that the addition of 2% PLA increased the fluidity by 13.18% and reduced the plastic viscosity by 38.04%, when compared to those of the SDTSM without PLA. PLA increased the water absorption of 200 • C-heated SDTSM and had small effect on the types but decreased the hydrate products of 85 • C-cured SDTSM, and created plenty of pores in 200 • C-heated SDTSM. PLA enhanced the self-degradation level of SDTSM by generating a large amount of pores in cement. These pores worked in two ways: one was such a large amount of pores led to a looser microstructure; the other was these pores made the water impregnate the cement more easily, and then made the dissolution of substances in the 200 • C-heated SDTSM progress faster to generate heat and to destruct the microstructure.

show abstract

Experimental and numerical studies on hydraulic fracturing characteristics with different injection flow rates in granite geothermal reservoir

Cheng

Zhang

et al. 2020

Energy Science & Engineering

View full text Add to dashboard Cite

Geothermal energy has been widely proposed as a potential renewable energy to replace traditional fossil fuel energy. Hot dry rock (HDR) reservoirs were the main geothermal energy resources and usually consist of low‐permeability hard granite without fluid. Developing HDR requires water cyclically flowing between injection and production wells to extract heat energy. Hydraulic fracturing, as a key reservoir stimulation technology, can create the path of fluid cyclically flowing. However, few studies have investigated hydraulic induced artificial fractures in HDR geothermal formations. This paper investigated HDR geothermal reservoir stimulation characteristics and fracture patterns under different injection flow rates. Numerical simulations were conducted to model the laboratory tests. Results showed they were in good agreement, and this indicated the possibility of numerical simulation to predict hydraulic fracturing behavior under different injection flow rates. With the increase of injection flow rate, the fracture initiation pressures and breakdown pressures increased, and the propagation times and postfracturing pressures decreased. The fracture geometries were observed and analyzed, mean injection power was proposed, and results showed that it could be used to roughly estimate the fracture total lengths. Moreover, the fracture permeabilities based on the pressure data were calculated. These results can provide some reasonable advice for implementing reservoir stimulations on application to field‐scale HDR operation.

show abstract

Electricity generation and heating potential from enhanced geothermal system in Songliao Basin, China: Different reservoir stimulation strategies for tight rock and naturally fractured formations

Cited by 51 publications

References 15 publications

Thermomechanical Behavior of Late Indo-Chinese Granodiorite under High Temperature and Pressure

Thermomechanical Behavior of Late Indo-Chinese Granodiorite under High Temperature and Pressure

Polylactic Acid Improves the Rheological Properties, and Promotes the Degradation of Sodium Carboxymethyl Cellulose-Modified Alkali-Activated Cement

Experimental and numerical studies on hydraulic fracturing characteristics with different injection flow rates in granite geothermal reservoir

Contact Info

Product

Resources

About