Effects of Curing Pressure on the Long-Term Strength Retrogression of Oil Well Cement Cured under 200 °C

Liu, Hongtao; Qin, Jiankun; Zhang, Bo; Liu, Zhongfei; Yuan, Zhenhong; Zhang, Zhi; Ai, Zhengqing; Pang, Xueyu; Liu, Xiaolin

doi:10.3390/en15166071

Cited by 10 publications

(6 citation statements)

References 31 publications

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“…The mechanical property test results of the slurries have been comprehensively analyzed in our previous publications (Pang et al, 2021;Liu et al, 2022). The compressive strength test results are summarized in Table 2, where it can be seen that all slurries exhibit significant long-term strength retrogression.…”

Section: X-ray Diffraction Patterns Of Samples Cured Under High Press...mentioning

confidence: 99%

“…Among these materials, silica flour is the most commonly used anti-strength retrogression agent and it has been proven to be quite effective for thermal recovery wells where the cement was set at a low temperature before high temperature exposure (Jiang et al, 2021;Santiago et al, 2021). However, several of our recent studies (Pang et al, 2021;Liu et al, 2022;Qin et al, 2022) have shown that silica flour is ineffective in preventing long-term strength retrogression at deep well conditions where the cement was set and cured both at 200 °C. While it is clear that the long-term strength retrogression is accompanied by cement microstructure coarsening, some inconsistent conclusions have been drawn with regard to what caused microstructure coarsening, primarily due to uncertainties in X-ray diffraction analysis.…”

Section: Introductionmentioning

confidence: 99%

“…Compressive strength of slurries cured under 200 °C and 50 MPa(Pang et al, 2021;Liu et al, 2022), MPa.…”

mentioning

confidence: 99%

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Mechanism of long-term strength retrogression of silica-enriched Portland cement assessed by quantitative X-ray diffraction analysis

Qin

Pang

et al. 2022

Front. Mater.

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In order to clarify on the driving force of cement long-term strength retrogression, a comprehensive quantitative X-ray diffraction (XRD) analysis were conducted on silica-enriched (60%–80% by weight of cement) cement samples set and cured under the condition of 200°C and 50 MPa with a maximum duration of 180 days. The phase content evolution with time was determined by three different methods on the average of three specimens: the external standard method; the partial or no known crystal structure (PONKCS) method; and the hybrid method. Although the specific phase content estimated by different methods varied slightly, the overall trend of change of all phases were similar. The phase transformation in set cement at high temperature condition is dependent on the slurry composition. In silica-deficient system, tobermorite and amorphous C-S-H were transformed to xonotlite; while in silica-sufficient system, tobermorite and amorphous C-S-H were transformed to gyrolite. These phase transformations involve gradual structural changes of cement hydration products, which may be the driving force of long-term strength retrogression. However, such structural changes can only be detected by XRD once the transformation is complete.

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Section: X-ray Diffraction Patterns Of Samples Cured Under High Press...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mechanism of long-term strength retrogression of silica-enriched Portland cement assessed by quantitative X-ray diffraction analysis

Qin

Pang

et al. 2022

Front. Mater.

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“…Various studies tend to cast smaller cement specimens due to the accommodation limit of autoclaves on a lab scale (e.g., cylindrical specimens with a 0.5-inch diameter). Also, different sample preparation methods were adopted, such as drilling from bigger cubes (Rimmelé et al, 2008) or casting in special moulds with covers (Liu et al, 2022), see Fig. 1.…”

Section: Carbonation Of Owc: Testing Behaviour and Mitigationmentioning

confidence: 99%

Cement Degradation Caused Risks for Geological Carbon Sequestration Reservoirs

Shi,

2023

16th International Conference on Durability of Building Materials and Components

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Geologic carbon sequestration (GCS), a process to capture and store CO2 in deep geologic formations, is considered an essential technique to reduce carbon emissions which are a main cause of global warming and climate change. Depleted oil and gas reservoirs are among the most appealing locations for GCS. However, the success of the strategy relies on the long-term integrity of the reservoirs, which is challenged by the carbonation reactions between the main reservoir sealing material, i.e., cement, and the stored CO2 and then the occurrence of fluid leakage. This work provides a concise review on the degradation of oil well cement and the interface between cement and casing/formation rock, with a special focus on the influence of different factors such as the curing, service conditions and contaminants. The mechanisms and the mitigation methods of the degradation process are also discussed. This work aims to summarise current research progress and identify some remaining challenges for future research.

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“…As shown in Figure 2, NT and ANA had much higher crystallinity than NS and GNA, which means they have less structural defects and are therefore less reactive. Micro-sized alpha-Al 2 O 3 was shown to have very limited reaction with Portland cement, even at temperatures as high as 200 • C over long curing periods up to 360 days [51,52]. The high surface area and amorphous structure both contribute to the high chemical reactivity of GNA.…”

Section: Nanomaterial-enriched Slurriesmentioning

confidence: 99%

Influence of Various Nanomaterials on the Rheology and Hydration Kinetics of Oil Well Cement

Baragwiha,

Fikeni,

Zhao

et al. 2023

Materials

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Nanomaterials have great potential to influence the properties of cement-based materials due to their small particle size and large specific surface area. The influences of Nano-SiO2 (NS), gamma-nano-Al2O3 (GNA), alpha-nano-Al2O3 (ANA), and nano-TiO2 (NT) on the rheology and hydration kinetics of class G cement at 30 °C were investigated in this study. The nanomaterials were added in dry powder form at dosages of 1, 2, 3, 5, and 7% by weight of cement (bwoc), and their dispersion was accomplished using polycarboxylate superplasticizer (PCE) at a dosage of 1.6% bwoc. PCE provides a uniform dispersion of nanoparticles in the cement matrix, enhancing the efficiency of nanomaterials. The w/c ratio varied between 0.718 and 0.78 to form a constant-density slurry of 1.65 g/cm3. Our test results showed that NS and GNA caused significant increases in the rheology of the cement slurry, with this effect increasing with dosage, while ANA and NT tended to reduce the rheology of the slurry. Compared to a well-suspended and well-dispersed cement slurry generated by the use of PCE and diutan gum, all nanomaterials can accelerate early hydration by reducing the induction time, with GNA having the strongest influence, while NS was the only nanomaterial that further increased the long-term hydration heat release at 7 days. The stronger effect of NS and GNA on the cement slurry properties can be attributed to their higher chemical reactivity. The dosage effect on total hydration extent was relatively strong for ANA, NT, and NS from 3% to 5% but weak for GNA in the range from 3% to 7%.

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Effects of Curing Pressure on the Long-Term Strength Retrogression of Oil Well Cement Cured under 200 °C

Cited by 10 publications

References 31 publications

Mechanism of long-term strength retrogression of silica-enriched Portland cement assessed by quantitative X-ray diffraction analysis

Mechanism of long-term strength retrogression of silica-enriched Portland cement assessed by quantitative X-ray diffraction analysis

Cement Degradation Caused Risks for Geological Carbon Sequestration Reservoirs

Influence of Various Nanomaterials on the Rheology and Hydration Kinetics of Oil Well Cement

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