Inhibitory effect of water-based drilling fluid on methane hydrate dissociation

Zhao, Xin; Qiu, Zhengsong; Chao, Zhao; Xu, Jiangen; Zhang, Yubin

doi:10.1016/j.ces.2018.12.057

Cited by 67 publications

(23 citation statements)

References 47 publications

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“…As an unconventional resource, natural gas hydrates are amendable to potential commercial natural gas production due to its huge reserves (Boswell et al, ). The natural gas hydrates exploitation has been a key focus of the development of energy industry in some countries (Zhao et al, ). Several field tests for natural gas production from hydrate‐bearing sediments have been conducted around the world (Chen et al, ; Heeschen et al, ; Takahashi et al, ).…”

Section: Introductionmentioning

confidence: 99%

Study on the Effects of Heterogeneous Distribution of Methane Hydrate on Permeability of Porous Media Using Low‐Field NMR Technique

Hou

Zhao

et al. 2020

JGR Solid Earth

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The permeability of sediments is an important parameter that effects flow characteristics of the gas and water in the process of natural gas hydrates development. The distribution of gas hydrate is generally heterogeneous in porous media. It poses a great challenge to the permeability measurement of hydrate‐bearing sediments. To study the effect of heterogeneous distribution of methane hydrate on the permeability of porous media, methane hydrate formation in the sandstone and permeability measurement was carried out using a low‐field nuclear magnetic resonance (NMR) measurement system in situ conditions. The spatial distribution of methane hydrate in the core samples was determined by combining the T2 distribution with magnetic resonance imaging. The results show that the distribution of methane hydrate is heterogeneous in the core samples. The temporal and spatial variation of permeability happens in the process of hydrate dissociation. The heterogeneity of methane hydrate distribution severely affects the analysis of permeability change. Considering the heterogeneity of methane hydrate distribution, a new method was proposed to obtain the quantitative relationship between hydrate saturation and relative permeability based on magnetic resonance imaging and the equivalent seepage capacity method. The results show that the relative permeability models obtained by this method agree better with experimental results. The optimum coefficients of relative permeability models obtained by equivalent seepage capacity method change significantly in contrast with the direct fitting method. The variation of the optimum coefficient is up to 300% in this study. The model coefficients are related to the pore characteristic of hydrate‐free porous media.

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Section: Introductionmentioning

confidence: 99%

Study on the Effects of Heterogeneous Distribution of Methane Hydrate on Permeability of Porous Media Using Low‐Field NMR Technique

Hou

Zhao

et al. 2020

JGR Solid Earth

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“…Phase equilibrium equation of methane hydrate in Equation ( 8) is commonly preferred to determine hydrate dissociation or not in fresh water [21]. where Peq and Teq are the equilibrium pressure (Pa) and the equilibrium temperature (K), respectively.…”

Section: Stability Of Methane Hydratementioning

confidence: 99%

“…However, the dissociation range reaches 8.72cm when the inhibitor concentration has increased to 30wt%, which is 2.28 times the dissociation range when fresh water is used as the drilling mud. The influence mechanism of inhibitor concentration on hydrate dissociation around wellbore in drilling operation has been revealed in literature [21]. According to Zhao et al [21], we know that the main reason for this is that inhibitors can reduce the range of the stable area (i.e., the upper left part of Figure 3) in the hydrate phase diagram, making the formation of naturals gas hydrates more difficult.…”

Section: Effect Of Iinhibitor Concentration On Hydrate Dissociationmentioning

confidence: 99%

“…The experimental results show that the designed drilling fluids can effectively reduce the possibility of hydrate dissociation in the near-wellbore region. Zhao et al [17] investigated the effect of inhibitors in water-based drilling fluid on hydrate dissociation during drilling operation. They found that all of thermodynamic hydrate inhibitors can affect hydrate dissociation.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Drilling Mud Properties on Hydrate Dissociation Around Wellbore during Drilling Operation in Hydrate Reservoir

2022

IJE

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Natural gas hydrate is a potential energy source in the near future, and its commercial development can alleviate the global energy crisis. Disturbance of drilling mud invasion on hydrate reservoir can lead to hydrate dissociation, affecting wellbore stability while drilling in clayey silt hydrate reservoirs. In this work, the coupled thermo-hydro-chemical finite element model was developed, and influences of drilling mud properties on hydrate dissociation were investigated. The obtained results show that the hydrate dissociation range around wellbore widens as the mud temperature increases. The final dissociation range caused by drilling mud invasion nonlinearly increases from 3.83cm to 10.57cm when the mud temperature has increased from 17.25℃ to 21.25℃. Therefore, the drilling mud needs to be cooled during preparation in platform. In addition, dissociation range narrows as the bottom-hole pressure increases. Dissociation range decreases from 12.18cm to 7.46cm when the bottom-hole pressure is increased from 14.50MPa to 17.00MPa. Thus, the overbalanced/near-balanced drilling operation is preferred during drilling in hydrate reservoirs, and the underbalanced drilling operation is not recommended. Moreover, the increase of mud salinity exacerbates hydrate dissociation in the nearwellbore region. In view of the prevention of hydrate dissociation in the near-wellbore, it is necessary to confect the drilling mud that with appropriate salinity while drilling in hydrate-bearing sediments.

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“…The influence factors of shale borehole stability are very complex, which can be attributed to three aspects: physicochemical factors, mechanical factors, and engineering factors . At present, a lot of researches have performed relatively adequate research on physicochemical factors and mechanical factors …”

Section: Introductionmentioning

confidence: 99%

Large‐scale experiments of the borehole instability on shale formation influenced by drill pipe rotation

Sun

Meng

Dai

et al. 2019

Energy Science & Engineering

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Wellbore instability happens mostly in the shale formation. Early researches have studied thoroughly on the physicochemical and mechanical mechanism that causes instability. However, only a few works have considered the influence of field drilling operations, such as drill pipe rotation. In this paper, a true triaxial cell is used to simulate the downhole field situations, and a drill pipe rotation device is innovatively designed and implemented into the true triaxial cell. Using this facility, the influence of drill pipe rotation on shale instability has been performed. Different rotation speed, weight on bit, drilling fluid pressure, and microcracks on borehole have been considered. The enlargement of the wellbore is quantitatively plotted and compared.Results show that the drill pipe rotation contributes to a more enlargement of the wellbore, and a higher rotation speed causes a more severe collapse. The drill string weight on bit also contributes to the enlargement of the wellbore, with a larger weight on bit induces a larger diameter of the collapsed wellbore. Compared with the rotation speed and weight on bit, the influence of drilling fluid density is relatively less significant. However, the influence of microcracks caused by hitting of drilling tools is profound. For a cracked shale formation, the wellbore diameter can be enlarged for more than 40%. Then, the variation of borehole collapse with time and depth under drill pipe rotation influence is analyzed. In all of these four factors, the significant sequence is microcracks > weight on bit > rotation speed > drilling fluid pressure.In all the collapse phenomena, the collapse is more severe in the minimum horizontal stress direction. This is explained by the analysis of the stress distribution in the whole circumferential angle (360°) of the wellbore. Overall, this work fills the gap of the influence of drilling operations on wellbore instability. K E Y W O R D Sborehole enlargement, drill pipe rotation, true triaxial cell, wellbore instability 2896 | SUN et al.

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Inhibitory effect of water-based drilling fluid on methane hydrate dissociation

Cited by 67 publications

References 47 publications

Study on the Effects of Heterogeneous Distribution of Methane Hydrate on Permeability of Porous Media Using Low‐Field NMR Technique

Study on the Effects of Heterogeneous Distribution of Methane Hydrate on Permeability of Porous Media Using Low‐Field NMR Technique

Effects of Drilling Mud Properties on Hydrate Dissociation Around Wellbore during Drilling Operation in Hydrate Reservoir

Large‐scale experiments of the borehole instability on shale formation influenced by drill pipe rotation

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