Effect of hydrothermal curing on early hydration of G-Oil well cement

Palou, Martin; Živica, Vladimı́r; Ifka, Tomáš; Boháč, Martin; Zmrzlý, Martin

doi:10.1007/s10973-013-3511-7

Cited by 37 publications

(24 citation statements)

References 16 publications

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“…The observed increase in the weight loss with the age of hydration is attributed to increase in the amount and/or the degree of crystallinity of the formed CH as a result of the progress of hydration of OWC. The endothermic peak obtained in the temperature range at 650-750°C is attributed to the partial carbonation of hydrated products during handling of the cement pastes [22,24]. The values of weight loss of this endotherm are accounted for the different degrees of carbonation of the hydrated specimens.…”

Section: Differential Thermogravimetric Analysis (Dtga)mentioning

confidence: 93%

“…8. The first endotherm located at 100-150°C is due to the dehydration of the amorphous part of calcium silicate hydrates (CSH) and calcium sulphoaluminate (ettringite and monosulfate) hydrates [22]. The values of weight losses of this endotherm are 1.12%, 6.06% and 7.23% after 6 h, 3 and 28 days of hydration, respectively.…”

Section: Differential Thermogravimetric Analysis (Dtga)mentioning

confidence: 99%

“…The rheological behavior, setting and thickening times of the cement slurries must be optimized with appropriate retarders and accelerators to achieve an effective wellbore cementing operation [5]. According to the American Petroleum Institute Specification for materials and testing for well cements (API Specification 10A, 2002) nine special classes of cements were established (Class A-Class J) [6]. Also OWCs are classified into three grades based upon their C 3 A contents [7].…”

Section: Introductionmentioning

confidence: 99%

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Early hydration characteristics of oil well cement pastes admixed with newly prepared organic admixture

et al. 2018

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A number of chemical and mineral admixtures are usually used in the oil-well cement (OWC) pastes to modify and control their fluidity to resist the higher temperatures and pressures during the drilling process of the well. In this study a newly prepared aliphatic organic compound namely cyclohexanone glyoxylate condensate (CG) was synthesized. The prepared compound (CG) was characterized using Fourier Transition Infrared spectroscopy (FT-IR) and microanalysis of carbon, hydrogen, oxygen and sulfur elemental analysis techniques. The effect of additions of 0.25, 0.50, 0.75 and 1 (mass%) of this admixture on the mechanical and early hydration characteristics of OWC pastes was studied. The phase composition for some selected hardened specimens was investigated using X-ray diffraction (XRD) and thermogravemtic analysis (DTGA) techniques. The results indicated that, addition of cyclohexanone glyoxylate condensate (CG) admixture to OWC pastes causes a slight retardation for the early rate of hydration of OWC. Addition of 0.25% of CG to OWC causes a slight improvement in the compressive strength values during nearly all ages of hydrations. XRD and DTGA results for the neat and CG admixed OWC pastes, indicate that the main hydration products are nearly amorphous calcium silicate hydrates (mainly as CSH-I and CSH-II), calcium sulfoaluminate hydrates (ettringite and monosulfate hydrate) as well as portlandite (CH).

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Section: Differential Thermogravimetric Analysis (Dtga)mentioning

confidence: 93%

Section: Differential Thermogravimetric Analysis (Dtga)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Early hydration characteristics of oil well cement pastes admixed with newly prepared organic admixture

et al. 2018

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“…Oil well cement (OWC) slurries are usually exposed to severe circumstances of pressure and temperature especially increasing the depth of the wellbore [2] close to those arising under hydrothermal curing systems [3][4][5]. G-class cement has been accepted in the oil well industry, especially for geothermal wells.…”

Section: Introductionmentioning

confidence: 99%

“…It has been terminated that at 150°C, the major hydration product (CSH) experiences metamorphosis to the greatly crystalline phase of α-dicalcium silicate hydrate (α-C 2 SH) whereas at 200°C calcium silicate hydrate (CSH) experiences transformation into jaffeite (C 6 S 2 H 3 ). Such transformation covered by the effect of high temperatures and pressures motivates undesirable characteristics as pronounced compressive strength decline, permeability development and pore structure reduction [2].…”

Section: Introductionmentioning

confidence: 99%

Mechanical and microstructure characteristics development of hardened oil well cement pastes incorporating fly ash and silica fume at elevated temperatures

Hazem

Hashem

El-Gamal

et al. 2020

Journal of Taibah University for Science

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The performance of oil well cement (OWC) incorporating pozzolana under diverse hydrothermal curing circumstances was inspected. OWC was partially replaced by 5 weight% of silica fume (SF) or fly ash (FA). The prepared composites were cured under different hydrothermal circumstances (60°C/0.02 MPa, 100°C/0.1 MPa and 150°C/0.48 MPa) for 7 days. The outcomes established that increasing curing temperature and pressure brought about a decline in the compressive strength magnitudes of various neat OWC pastes. This finding is correlated to the metamorphosis of CSH to the greatly crystalline phase of α-dicalcium silicate hydrate (α-C2SH). Such transformation motivates the destruction of the pore structure and promotes compressive strength decline. Admixing OWC with 5 wt.% SF or FA displayed enrichment in the mechanical aspects accompanied by the progression of highly compact microstructures. Additionally, the presence of SF or FA motivates the advancement of stable and desirable hydration products. DTG/TG, XRD and SEM analyses affirm these results.

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General Understanding of Calcium Silicate Hydrates

Baltakys,

Dambrauskas

2024

Synthetic Gyrolite

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Effect of hydrothermal curing on early hydration of G-Oil well cement

Cited by 37 publications

References 16 publications

Early hydration characteristics of oil well cement pastes admixed with newly prepared organic admixture

Early hydration characteristics of oil well cement pastes admixed with newly prepared organic admixture

Mechanical and microstructure characteristics development of hardened oil well cement pastes incorporating fly ash and silica fume at elevated temperatures

General Understanding of Calcium Silicate Hydrates

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