An experimental investigation of the proportion of mortar components on physical and geomechanical characteristics of unconsolidated artificial reservoir sandstones

Shakiba, Mahmood; Khamehchi, Ehsan; Fahimifar, Ahmad; Dabir, Bahram

doi:10.1016/j.petrol.2020.107022

Cited by 12 publications

(16 citation statements)

References 36 publications

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“…In order to determine the influence of different clays on the physico-chemical and geomechanical characteristics of engineered porous rocks, six series of samples containing kaolinite, illite, and bentonite with two levels of clay content (5% and 10%) were prepared according to the ASTM C305 standard 6 . It is worth mentioning that sand particle sizes remained constant in the range of 0.1 to 0.8 mm (i.e.…”

Section: Sample Preparationmentioning

confidence: 99%

Section: Sample Preparationmentioning

confidence: 99%

“…To provide artificially-made core samples in this study, a composition proposed by Shakiba et al was used 6 , 63 . The composition consists of sand, cement, water and a clay mineral according to the results of porosity, permeability and compressive strength tests 6 . They first proposed nine compositions for synthetic sandstones prepared based on the ASTM C305 method, and eventually, the composition including 12 wt% water, 11 wt% cement, 5 wt% clay mineral, and 72 wt% sand was considered to be an appropriate composition for artificial sandstones 6 , 63 .…”

Section: Sample Preparationmentioning

confidence: 99%

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Effects of type and distribution of clay minerals on the physico-chemical and geomechanical properties of engineered porous rocks

Iranfar

Karbala

Shakiba

et al. 2023

Sci Rep

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The study of the properties of engineered rocks is of great importance to researchers in engineering sciences such as petroleum, mining, and civil engineering owing to their wide application in these fields. In the present study, a physico-chemical and geomechanical investigation was carried out on the effects of different clay minerals on porous rocks. Various chemical products formed during chemical interactions between cement, clay minerals, and water can change the pore structure and thus the rock characteristics. The results of the current study showed that increasing the clay content could remarkably reduce the porosity and permeability of the rock by an average of 86% and 6.76%, respectively. In this regard, samples containing kaolinite were further influenced due to their new pore structure. Moreover, a power relationship was found between sonic velocity and porosity, which can be used to predict rock properties. Chemical analysis indicated an amplification in quantities of chemical products, particularly calcium silicate hydrate and portlandite, due to an increase in clay content. The impacts of porosity and cementation quality as two main factors on rock strength have also been studied. The outcomes revealed that a reduction in porosity could compensate for detrimental effects of poor bond quality and consequently improved UCS by up to 30% in samples containing kaolinite, while decreasing the degree of cementation prevailed over the porosity reduction in specimens including illite and resulted in a 14% decrease in UCS. The effects of porosity and bond quality on UCS would cancel each other out in samples containing bentonite. It is worth noting that when it comes to changes in geomechanical characteristics, the dominant factor (i.e., porosity reduction or cementation quality) determines the ultimate effect of clay minerals on the properties of engineered porous rocks.

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Section: Sample Preparationmentioning

confidence: 99%

Section: Sample Preparationmentioning

confidence: 99%

Section: Sample Preparationmentioning

confidence: 99%

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Effects of type and distribution of clay minerals on the physico-chemical and geomechanical properties of engineered porous rocks

Iranfar

Karbala

Shakiba

et al. 2023

Sci Rep

Self Cite

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“… 17 − 19 First, the cementing strength of rocks weakens, especially when rocks contain many water-sensitive clay minerals, such as montmorillonite. 20 − 23 These water-sensitive clay minerals react with the reservoir water from the far end of the well and swell to weaken the bond between particles in the rock, making it easier for particles to peel off. However, severe sand production can lead to a series of problems, such as tubing pump stuck, wellbore burial, and even the stopping of the production of oil and gas wells.…”

Section: Introductionmentioning

confidence: 99%

“…High water production may cause a series of problems in oil and gas wells, such as a sharp decline in oil and gas production, and corrosion and abrasion of metal equipment. − Especially for unconsolidated sandstone reservoirs, sand production phenomena are common in the development process due to their loose cementation and low strength. Once water intrusion occurs in the reservoir, it can cause some fatal hazards to the production of oil and gas wells. − First, the cementing strength of rocks weakens, especially when rocks contain many water-sensitive clay minerals, such as montmorillonite. − These water-sensitive clay minerals react with the reservoir water from the far end of the well and swell to weaken the bond between particles in the rock, making it easier for particles to peel off. However, severe sand production can lead to a series of problems, such as tubing pump stuck, wellbore burial, and even the stopping of the production of oil and gas wells. − Second, water intrusion increases the number of particles transported to the wellbore.…”

Section: Introductionmentioning

confidence: 99%

Study on the Water Blocking Capacity and Influencing Factors of Hydrophobic Gravel Beds

et al. 2021

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Excess water production is a common and extremely serious problem during the process of reservoir development, especially in the middle and later stages of unconsolidated sandstone reservoirs. High water content ratios will negatively affect the recovery efficiency and equipment safety of oil and gas wells. In this study, a hydrophobic quartz sand proppant was prepared with 1,1,1,3,3, 3-hexamethyldisilazane (HMDS) for gravel packing technology. The capillary resistance of hydrophobic quartz sand beds to water was used to achieve water inhibition and oil enhancement. Then, a theoretical capillary bundle model of a quartz sand bed was developed to predict the capillary resistance and water blocking capacity of the quartz sand bed. An evaluation of the experiment results shows that the activation index is up to 96% and the water contact angle is up to 151° after treatment by 0.6 wt % HMDS, which indicates that the quartz sand after modification has strong hydrophobicity. The calculation results demonstrate that the capillary resistance (CR) and the water blocking capacity (WBC) decrease with increasing quartz sand particle size and porosity of the quartz sand bed. As the water contact angle increases, the CR and WBC are also increased. In addition, to make the WBC of hydrophobic quartz sand bed δ > 20%, the parameters of the quartz sand bed must be satisfied: particle size d g < 50 μm, porosity ϕ < 30%, water contact angle θ > 150°, and production pressure difference Δ p < 1 MPa. The results of this study could provide theoretical guidance for the construction parameters of hydrophobic gravel packing in high water-cut oil and gas fields.

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Influence of grain contents on the dynamic strength of rock-like materials

Weng,

Le,

et al. 2024

Engineering Geology

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An experimental investigation of the proportion of mortar components on physical and geomechanical characteristics of unconsolidated artificial reservoir sandstones

Cited by 12 publications

References 36 publications

Effects of type and distribution of clay minerals on the physico-chemical and geomechanical properties of engineered porous rocks

Effects of type and distribution of clay minerals on the physico-chemical and geomechanical properties of engineered porous rocks

Study on the Water Blocking Capacity and Influencing Factors of Hydrophobic Gravel Beds

Influence of grain contents on the dynamic strength of rock-like materials

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