作者: M KALIMUR RAHMAN , SH Aboubakr , MM REDA TAHA , None
DOI: 10.21012/FC9.143
关键词:
摘要: Type-G cement slurry with various admixtures commonly used in oil/gas well cementing (OWC) incorporating 1, 2 and 3% nanoclay particles by weight of were produced. A water/cement ratio 0.44 was the mixes subjected to a temperature 290° F pressure 4666 psi for 48 hours. First, effect on compressive strength evolution investigated. Second elastic viscoelastic characteristics cementitious characterized using nanoindentation. The nanoindentation tests enabled evaluating maximum indentation depth, plastic reduced modulus. Furthermore, dwell time 60 seconds evaluate creep compliance nanoclay. Fracture toughness estimated from data during loading period. Scanning electron microscope (SEM) X-ray diffraction (XRD) microstructural analyses conducted explain results observed finite element modeling simulate test extract stress-strain material cured under high pressure. Moreover, experimental observations showed that improved compared neat eliminated retrogression problem. 1 2% resulted insignificant change (-28 +12%) modulus cement. However, content significant increase (+54%) reduction analysis improvement fracture due addition XRD SEM investigations proved incorporation mix transforms Calcium Hydroxide (CH) calcium silicate hydrate (C-S-H) capillary porosity leading higher Finally, extracted curves method shows adding stiffening OWC paste. significance seems strongly dependent quality its mixing DOI 10.21012/FC9.143 Kalimur Rahman et al.