Study of D-limonene as novel green hydraulic fracturing surfactant in shale gas reservoir

Krishnan, Arvindraj; Aji, Aminah Qayyimah Mohd; Maulianda, Belladonna; Mohshim, Dzeti Farhah; Barati, Reza

doi:10.1016/j.jngse.2022.104588

Cited by 6 publications

(1 citation statement)

References 43 publications

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“…In recent years, the effect of OBDF on formation damage in shale gas wells has been thoroughly studied. − Most studies on formation damage mechanisms of shale mainly focus on the single-factor formation damage mechanism, including fines migration damage, aqueous phase trapping damage, stress damage, and salting out damage. − However, the damage mechanisms induced by OBDF invasion and its impact on later operations require additional investigation. The scope of this paper is to focus on the formation damage induced by OBDF during several specific stages of shale gas reservoir exploration and development in a gas shale formation from the Sichuan Basin.…”

Section: Introductionmentioning

confidence: 99%

Formation Damage Induced by Oil-Based Drilling Fluid in a Longmaxi Shale Gas Reservoir: A Comprehensive View of the Drilling, Stimulation, and Production Processes

et al. 2022

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Formation damage during drilling, completion, and stimulation stages is an important reason inducing the obviously different initial production rates and rapid declines in shale gas wells. How the formation damage at all of the exploration and development stages is reduced is a major engineering problem to be solved urgently in shale gas reservoirs. Oil-based drilling fluid (OBDF) is the first choice for drilling horizontal long sections for its good inhibition and lubrication. However, formation damage induced by OBDF during the entire exploration and development cycle of the shale gas reservoir is still not well understood. In this study, formation damage degree during the drill-in stage was evaluated simulating OBDF circulation and shearing flow on the wellbore surface. A working fluid sequential contact test was designed to evaluate the impact of the OBDF on the fracturing fluid damage. A permeability stress sensitivity test on shale samples before and after OBDF invasion was carried out to analyze the formation damage during the depletion exploitation stage. Results indicate that the damage rate of the OBDF in the drill-in stage to induced fractures is 72.0%. Compared with a single fracturing fluid, the sequential contact between the OBDF and the fracturing fluid further exacerbates damage degree with a permeability damage rate increase of 27.3%. Matrix strength weakening, fracture surface asperity dissolution, and oil phase trapping induced by OBDF invasion strengthen the permeability stress sensitivity of the fractured samples. The formation damage caused by OBDF becomes permanent, multicycle superimposed damage, which makes the formation damage more severe and difficult to be eliminated. The invasion of OBDF into shale is the premise of inducing shale gas formation damage. Improving the plugging efficiency and pressure-bearing capacity for the multiscale intrusion channels is the primary factor in controlling formation damage in shale gas reservoirs. This study provides guidance for the development of formation protection drilling fluids in shale gas reservoirs.

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Section: Introductionmentioning

confidence: 99%

Formation Damage Induced by Oil-Based Drilling Fluid in a Longmaxi Shale Gas Reservoir: A Comprehensive View of the Drilling, Stimulation, and Production Processes

et al. 2022

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Study on the influence of vertical stress difference coefficient on fracture characteristics of shale under high stress

Chang,

Qiu,

et al. 2024

Energy Science & Engineering

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To study the effect of vertical stress difference coefficient on fracture characteristics of shale fracturing, high stress true triaxial hydraulic fracturing test was carried out. By analyzing the profile after fracturing, it was found that the area of hydraulic fracture increased with the increase of vertical stress difference coefficient, and the probability of shear fracture will increase when the stress difference coefficient was high. A high vertical stress differential coefficient exerts a strong control over the direction of crack propagation, while a low vertical stress difference coefficient is beneficial to improve the roughness of hydraulic fracture surface and promote the formation of complex fracture network. By analyzing the pump pressure curves of different tests, it was found that with the increase of vertical stress difference coefficient, the formation and expansion of hydraulic fractures were more difficult. The surface characteristics of hydraulic fractures were quantified based on three‐dimensional topography scanning technology, combined with fractal dimension and fracture area calculation method, the results showed that with the increase of vertical stress difference coefficient, the fractal dimension and fracture area decreased. Since shale is stratified, and the transformation of reservoir is mainly reflected in the enhancement of fracture complexity through tensile failure, Xsite discrete grid method was used to study the influence of fracture propagation behavior with different bedding strengths. The results showed that when the bedding tensile strength was high, hydraulic fractures were easy to pass through the bedding, and when the bedding tensile strength was low, hydraulic fractures were easy to be captured by natural fractures. In addition, tensile cracks were easy to form when the tensile strength of bedding was low, shear cracks were easy to form when the strength of bedding was high, and the fracture volume was larger when the strength of bedding was low. This study provides a theoretical basis for hydraulic fracturing in engineering.

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Experimental study of influence of natural organic solvent limonene on methane adsorption–desorption behaviors of selected rank coals

Liang,

Kang,

Kang

et al. 2024

Energy

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Study of D-limonene as novel green hydraulic fracturing surfactant in shale gas reservoir

Cited by 6 publications

References 43 publications

Formation Damage Induced by Oil-Based Drilling Fluid in a Longmaxi Shale Gas Reservoir: A Comprehensive View of the Drilling, Stimulation, and Production Processes

Formation Damage Induced by Oil-Based Drilling Fluid in a Longmaxi Shale Gas Reservoir: A Comprehensive View of the Drilling, Stimulation, and Production Processes

Study on the influence of vertical stress difference coefficient on fracture characteristics of shale under high stress

Experimental study of influence of natural organic solvent limonene on methane adsorption–desorption behaviors of selected rank coals

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