A Comparative Study of Monotonic and Cyclic Injection Hydraulic Fracturing in Saturated Tight Rocks Under Triaxial Stress

Goyal, Saurabh; Curtis, Mark E.; Sondergeld, Carl H.; Rai, Chandra

doi:10.15530/urtec-2020-2952

Cited by 7 publications

(6 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Pressure Reduction in Cyclic Injection Tests As discussed before, in hydraulic fracturing, cyclic injection can reduce the breakdown pressure [4,5,12,16]. One method to quantify the effect of cyclic injection tests is to plot the normalized breakdown pressure (breakdown pressure in cyclic injection/breakdown pressure in conventional injection) versus the number of cycles.…”

Section: Empirical Curve Fitting For Breakdownmentioning

confidence: 99%

“…Kang et al [12] Tight Xujiahe sandstone Kang et al [12] Normal Xujiahe sandstone Patel et al [4] Tennessee sandstone Goyal et al [5] Tennessee sandstone Zhuang et al [16,17] Pocheon granite Diaz et al [18,19] Pocheon granite Stephansson et al [20] Pocheon granite Liang et al [21] Concrete Tariq et al [8] Concrete 6 Geofluids where b and σ f ′ are empirically fitted parameters, which are called the fatigue strength exponent and the fatigue strength, respectively. Figure 12 illustrates the concept of the σ a versus N f curve.…”

Section: Authors Rock Typementioning

confidence: 99%

“…However, it appears that for sandstones, all previous experimental work was conducted on relatively porous specimens. For example, the porosity for the Tennessee sandstone tested by Patel et al [4] and Goyal et al [5] is approximately 8.5%. In other words, it appears that no experimental work has been conducted to systematically study the effect of cyclic injection on the breakdown pressure in very tight sandstones.…”

Section: Introductionmentioning

confidence: 95%

“…Several research groups have experimentally investigated the effect of cyclic loading on breakdown pressure reduction: Patel et al [4] and Goyal et al [5] conducted cyclic injection on sandstone; Zhuang et al [6] and Zang et al [7] conducted cyclic injection on granite; and Tariq et al [8] conducted cyclic injection on concrete. They reported that at laboratory scale, compared to conventional injection in which the injection pressure increases monotonically, the cyclic injection can reduce the breakdown pressure of sandstone [4,5], granite [6,7], and concrete [8]. For example, Zhuang et al [6] conducted cyclic injection tests on 34 Pucheon granite specimens, and they reported that cyclic injection can reduce the breakdown pressure for granitic rocks by at least 10%.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Cyclic Injection to Enhance Hydraulic Fracturing Efficiency: Insights from Laboratory Experiments

Kang

Zhang²,

Fan

et al. 2020

Geofluids

View full text Add to dashboard Cite

In hydraulic fracturing applications, there is substantial interest to reduce the formation breakdown pressure. Previous research results show that the cyclic injection method can be used to reduce that pressure. In this study, we conducted laboratory hydraulic fracturing experiments to apply cyclic injection to reduce the breakdown pressures of very tight and strong sandstones. Experimental results show that using cyclic injection the average breakdown pressure was reduced by 18.9% in very tight sandstones and by 7.18% in normal sandstones. This indicates that the effect of cyclic injection is more significant for stronger and tighter rocks. The experiments also reveal that the rock tensile strength plays a more important role in the formation breakdown pressure with a rock strength factor of 2.85. This suggests that the breakdown pressure is higher than expected. In addition, we empirically related the breakdown pressure reduction and the injection pressure amplitude to the number of injection cycles. The curve fitting results imply that the effect of cyclic injection is more important if the number of cycles or the injection pressure amplitude is increased. Based on the results of this research, the in-situ formation breakdown pressure can be reduced by applying the cyclic injection method, and the breakdown pressure reduction is more significant as the number of cycles increases.

show abstract

Section: Empirical Curve Fitting For Breakdownmentioning

confidence: 99%

Section: Authors Rock Typementioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Cyclic Injection to Enhance Hydraulic Fracturing Efficiency: Insights from Laboratory Experiments

Kang

Zhang²,

Fan

et al. 2020

Geofluids

View full text Add to dashboard Cite

show abstract

“…The direction of crack initiation will deflect to the maximum principal stress, which may cause CHF to easily form biwing fractures. In terms of permeability, Goyal et al (2020) identified that the permeability of CHF could be enhanced by approximately 3 times that expected for THF when the confining pressure is 6.89 MPa and approximately 2 times that expected for THF when the confining pressure is 34.47 MPa, as shown in Fig. 9.…”

Section: Effects Of the Confinement Pressure On Chfmentioning

confidence: 85%

A critical review of the experimental and theoretical research on cyclic hydraulic fracturing for geothermal reservoir stimulation

Xie

et al. 2021

Geomech. Geophys. Geo-energ. Geo-resour.

View full text Add to dashboard Cite

Hydraulic fracturing is necessary to stimulate deep geothermal reservoirs. Compared with traditional hydraulic fracturing (THF), cyclic hydraulic fracturing (CHF) decreases the breakdown pressure (BP), generates a more complex crack network and reduces the induced seismicity; thus, it has attracted increasing attention. In this work, state-of-the-art studies on CHF are comprehensively reviewed for the first time. Six CHF cyclic loading schemes are clarified, and their stimulation results are discussed. It is difficult to assess which loading schemes are the most advantageous because the reservoir boundary conditions and properties of rock specimens vary. The effects of critical influential factors on the stimulation results of CHF are reviewed in detail. A higher confining pressure generally produces longer cracks, and a lower-viscosity fracturing fluid more easily connects micropores and widens cracks. The existing theoretical and numerical models of CHF, which are based mainly on fracture mechanics and damage mechanics, are summarized and discussed. Based on this comprehensive review, some aspects through which the failure mechanism of CHF can be further understood are suggested. This work can benefit the application of CHF to exploit deep geothermal resources. Article Highlights• Six different cyclic hydraulic fracturing schemes are classified, and the corresponding stimulated effects are discussed. • The effects of the primary influencing factors on cyclic hydraulic fracturing are summarized. • Recommendations for further studying cyclic hydraulic fracturing are suggested.

show abstract

Comparison of Fatigue Hydraulic Fracturing of Granite Cores Subjected to Creep and Cyclic Injection

Zhuang,

Sun,

Hofmann

et al. 2024

Rock Mech Rock Eng

View full text Add to dashboard Cite

A Comparative Study of Monotonic and Cyclic Injection Hydraulic Fracturing in Saturated Tight Rocks Under Triaxial Stress

Cited by 7 publications

References 0 publications

Cyclic Injection to Enhance Hydraulic Fracturing Efficiency: Insights from Laboratory Experiments

Cyclic Injection to Enhance Hydraulic Fracturing Efficiency: Insights from Laboratory Experiments

A critical review of the experimental and theoretical research on cyclic hydraulic fracturing for geothermal reservoir stimulation

Comparison of Fatigue Hydraulic Fracturing of Granite Cores Subjected to Creep and Cyclic Injection

Contact Info

Product

Resources

About