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

Abstract

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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“…[31] after 7 and 28 days of hydration, respectively. The endothermic peak located at 505 °C, is assigned to the thermal destruction of Ca(OH) 2 [32,33]. The % mass loss of the first peak is 6.9 and 7.2, while for the second peak 2.1 and 2.8 after 7 and 28 days of hardening, respectively.…”

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“…When subjected to rising temperatures, the weight loss in the cement paste specimens occurred primarily in three phases. Firstly, at room temperature up to 200°C, weight loss was due to the dehydration of water molecules in hydrated cement materials such as C-S-H and ettringite (calcium sulphoaluminate hydrate) [43,44].…”

Effect of Black Liquor from Date Palm on the Workability and Compressive Strength of Portland Cement and Concrete

“…The shear stress-strain behaviour of mortar paste has been represented using several models [33], [42][43][44], the Herschel-Bulkley model, show Eq. (1) qualified more versatile model has been used by several researchers [32]: 1Where is the shear stress in (Pa), is the shear strain rate (1/s), n is the power index, k is the consistency (Pas), and is the yield stress (Pa).…”

“…On the other hand the rate of increase in the compressive strength values during the period from 7 to 28 days is due to the fact that the initially formed hydration products shielded the remaining unhydrated parts of cement grains leading to a quick rate of hydration during this period [33] [42].…”