Sustaining Wormholes Mechanical Stability in Weak Acidized Carbonates Using Consolidants

Mustafa, Ayyaz; Desouky, Mahmoud; Aljawad, Murtada Saleh; Sølling, Theis I.; Dvorkin, Jack

doi:10.1007/s00603-023-03285-4

Cited by 4 publications

(2 citation statements)

References 22 publications

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“…Therefore, future studies should involve testing the strength of samples treated at higher temperatures, as well as varying pressure and solution concentrations, to enhance the current understanding and simulate reservoir conditions. Moreover, it has been shown that higher temperature and pressure conditions in addition to the initial concentrations of the treatment solution can result in a more pronounced improvement in the mechanical properties of carbonate specimens 43 , 46 , 48 . Also, subsequent examination of carbonate rocks can be expanded to include larger specimens and encompass aspects like tensile properties, addressing all potential deformation scenarios that contribute to wellbore instability problems.…”

Section: Discussionmentioning

confidence: 99%

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In-situ micro-CT scanning and compressive strength assessment of diammonium hydrogen phosphate (DAP) treated chalk

Samarkin,

Amao,

Aljawad

et al. 2023

Sci Rep

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The occurrence of wellbore mechanical failure is a consequence of the interaction among factors such as in situ stress, rock strength, and engineering procedures. The process of hydrocarbons production, causing reduction of pore pressure, alters the effective stresses in the vicinity of a borehole, leading to borehole instability issues. Estimating the rocks’ elastic modulus and compressive strength is essential to comprehend the rock matrix’s mechanical response during drilling and production operations. This study aimed to assess the practicality of Diammonium Hydrogen Phosphate (DAP) application as a chemical for strengthening chalk in hydrocarbon reservoirs, to make it resistant to high stresses and failure during drilling and production. The mechanical and physical properties of Austin chalk rock samples treated with DAP under mimicked reservoir conditions were studied. The results showed that DAP is a highly effective carbonate rock consolidating agent that improves the mechanical strength of the chalk. Compressive test measurements conducted on rocks treated at two different temperatures (ambient and 50 °C) showed that DAP effectively strengthened the rock matrix, resulting in an increase in its compressive strength (22–24%) and elastic modulus (up to 115%) compared to the untreated sample. The favorable outcomes of this research suggest that the DAP solution holds promise as a consolidation agent in hydrocarbon reservoirs. This contributes to the advancement of knowledge regarding effective strategies for mitigating mechanical failures of the wellbore during drilling and production.

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Section: Discussionmentioning

confidence: 99%

“…Recent studies tested consolidating efficiency of DAP at high-temperature conditions 14 , 46 – 48 . These studies demonstrated the hardening effect of DAP to be more significant if the rock samples are treated at high-temperature conditions.…”

Section: Introductionmentioning

confidence: 99%

In-situ micro-CT scanning and compressive strength assessment of diammonium hydrogen phosphate (DAP) treated chalk

Samarkin,

Amao,

Aljawad

et al. 2023

Sci Rep

Self Cite

View full text Add to dashboard Cite

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Stability of Carbonate Rocks Containing Acid Wormholes Under High Confining Pressures

Algarni,

Aljawad,

Al-Majid

et al. 2023

Rock Mech Rock Eng

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Study on rock strength weakening in multi-stage acid fracturing using continuous strength test

Wang,

Zhou,

et al. 2024

Physics of Fluids

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Multi-stage acid fracturing can boost productivity in low-permeability limestone reservoirs, with success hinging on differential etching and the strength of undissolved regions to keep fractures open. Traditional rock strength test methods have strong randomness and error. This study explores the influence of four acid systems (hydrochloric acid, single-phase retarded acid, gelled acid, and emulsified acid) on fracture surface strength based on a new continuous strength test method. The rock strength weakening variation under different acid types and injection conditions was quantified, and the mechanism of single-phase retarded acid slowing down rock strength reduction was revealed. The results indicated that the fracture surfaces were reduced to a lesser extent than in traditional rock mechanical failure studies. Hydrochloric acid caused up to 28% of rock strength depletion, followed by 23% for gelled acid, 18% for emulsified acid, and 11.8% for single-phase retarded acid. Adjusting the acid injection parameters revealed that longitudinal leak-off at the fracture surface changes the rock's strength failure tendency. The microscopic results confirmed that the appropriate acid-rock reaction rate and viscosity are beneficial in reducing strength by forming the dominant wormhole that “siphons” the subsequent acid more profoundly into the formation, thereby reducing the reaction of the acid with the fracture surface. This study can help to understand better the mechanism by which acid reduces the strength of fracture surfaces and can provide guidance for selecting appropriate acid fluids for acid fracturing in low-permeability limestone reservoirs.

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Sustaining Wormholes Mechanical Stability in Weak Acidized Carbonates Using Consolidants

Cited by 4 publications

References 22 publications

In-situ micro-CT scanning and compressive strength assessment of diammonium hydrogen phosphate (DAP) treated chalk

In-situ micro-CT scanning and compressive strength assessment of diammonium hydrogen phosphate (DAP) treated chalk

Stability of Carbonate Rocks Containing Acid Wormholes Under High Confining Pressures

Study on rock strength weakening in multi-stage acid fracturing using continuous strength test

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