Impact of downhole pressure and fluid-access on the effectiveness of wellbore cement expansion additives

Wolterbeek, T.K.T.; Cornelissen, E.K.; Hangx, Suzanne; Spiers, Christopher J.

doi:10.1016/j.cemconres.2021.106514

Cited by 19 publications

(2 citation statements)

References 79 publications

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“…In reality, it is impossible to completely avoid cracking through controls of the temperature. Cement-based cementitious materials are prone to shrinkage in various ways, such as self-shrinkage, drying shrinkage, plastic shrinkage, and carbonation shrinkage (Wolterbeek et al, 2021;Zheng et al, 2022). In addition to provide channels for harmful ions to pass through, the cracks caused by thermal stress and volume shrinkage can also have negative effects on the properties of cement (Xin et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Hydration and durability of low-heat cementitious composites for dam concrete: Thermodynamic modeling and experiments

Zhang

2023

Front. Mater.

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To demonstrate the superiority of dam concrete, a systematic study was conducted to examine the durability of low-heat cementitious composite (LHCC) that is composed of Portland cement (PC), fly ash (FA), and MgO expansive additive (MEA) with PC as the reference group. Through GEMS software, XRD, SEM, and EDS, the difference mechanism in durability between the two cementitious materials was revealed from the perspectives of phase evolution and microstructural characteristics. Water at 40 °C was adopted for curing in the study to match the long-term temperature field inside the concrete dam. According to the results of the RCM, accelerated carbonation, and rapid freeze–thaw cycle experiments, LHCC outperforms PC in durability. The hydration process of LHCC is simulated by inputting the reaction degree of each phase calculated using the MPK model into the GEMS software. The thermodynamic model output shows that portlandite first increases and then decreases as LHCC hydration proceeds, and C-S-H and stratlingite are supplemented in the later stage, which reflects the high performance of FA involved in hydration. In addition, hydrotalcite that is capable of chloride ion adsorption is increasingly generated with the consumption of brucite. As is clearly shown in the SEM images, there are denser space grids formed by overlapping C-S-H in LHCC with almost no capillary pores. Meanwhile, when combined with the results of EDS, it is strongly demonstrated that the FA in LHCC can be hydrated to produce dense fibrous C-S-H in large amounts, providing a basis for the positive development of durability.

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Section: Introductionmentioning

confidence: 99%

Hydration and durability of low-heat cementitious composites for dam concrete: Thermodynamic modeling and experiments

Zhang

2023

Front. Mater.

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“…While designed to have a low permeability, the Portland cements, typically used to create hydraulic barriers against unwanted fluid seepage along wellbores, may become impaired by permeable defects, such as fractures within the cement or debonding micro-annuli along its interfaces with the casing pipe or rock formations. Such defects can have various causes, including (i) ineffective cement placement [9][10][11], (ii) autogenous shrinkage and debonding upon setting of the cement [12][13][14][15][16][17][18], or (iii) mechanical damage sustained by the set cement [19][20][21][22][23][24][25][26]. The defects offer possible routes for annular gas migration, potentially leading to sustained casing pressure (SCP), surface-casing vent flow (SCVF), or other sealing integrity issues [27,28].…”

Section: Introductionmentioning

confidence: 99%

Remediation of Annular Gas Migration along Cemented Wellbores Using Reactive Mineral Fluids: Experimental Assessment of Sodium Bicarbonate and Sodium Silicate-Based Solutions

Wolterbeek

Hangx

2021

Energies

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Achieving zonal isolation along wellbores is essential for upholding the containment integrity of subsurface reservoirs and preventing fluid seepage to the environment. The sealing performance of Portland cements conventionally used to create barriers can be severely compromised by defects like fractures or micro-annuli along casing–cement–rock interfaces. A possible remediation method would be to circulate reactive fluids through compromised cement sections and induce defect clogging via mineral precipitation. We assess the sealing potential of two prospective fluids: sodium bicarbonate and sodium silicate solutions. Reactive flow-through experiments were conducted on 6-m-long cemented steel tubes, bearing ~20-μm-wide micro-annuli, at 50 °C and 0.3–6 MPa fluid pressure. For the sodium bicarbonate solution (90 g/kg-H2O), reactive flow yielded only a minor reduction in permeability, with values remaining within one order. Injection of sodium silicate solution (37.1 wt.%, SiO2:Na2O molar ratio M= 2.57) resulted in a large decrease in flow rate, effectively reaching the setup’s lower measurement limit in hours. However, this strong sealing effect can almost certainly be attributed to gelation of the fluid through polymerisation, rather than defect clogging via mineral precipitation. For both fluids investigated, the extent of solids precipitation resulting from single-phase injection was less than anticipated. This shortfall is attributed to ineffective/insufficient liberation of Ca-ions from the alkaline phases in the cement.

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Study on the Synthesis and Performance Evaluation of a Composite High-Temperature Flushing Isolation Fluid Stabilizer

Lv,

Zhang,

Wang

et al. 2024

Chem Technol Fuels Oils

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Impact of downhole pressure and fluid-access on the effectiveness of wellbore cement expansion additives

Cited by 19 publications

References 79 publications

Hydration and durability of low-heat cementitious composites for dam concrete: Thermodynamic modeling and experiments

Hydration and durability of low-heat cementitious composites for dam concrete: Thermodynamic modeling and experiments

Remediation of Annular Gas Migration along Cemented Wellbores Using Reactive Mineral Fluids: Experimental Assessment of Sodium Bicarbonate and Sodium Silicate-Based Solutions

Study on the Synthesis and Performance Evaluation of a Composite High-Temperature Flushing Isolation Fluid Stabilizer

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