A critical phase of oil well completion involves positioning cement between the outer surface of a metal casing and the sides of the well. This task is done by injecting a specially formulated cement slurry down the center of the casing and up the sides of the bore hole. Designing these slurry systems is time consuming and expensive because of the variability of the conditions between wells and...

In this study, the effects of particle size distribution improvement and dense packing techniques on the 28- and 90-day compressive strengths of class G oil well cement have been investigated. It was observed that limited improvements in the particle size distribution of cement (regarding industrial possibilities) cannot result in a significant increase in 28- and 90-day compressive strengths. ...

As the exploitation of oil and gas field becomes more difficulty nowadays, severe casing deformation may occur if anti-extrusion strength decreases to a certain degree this brings large economic loss safety problems. an annular sheath between formation, creep well cement paste is one most important factors in deciding abnormal wellbore integrity. To figure out mechanism on how reduce value past...

Physical and chemical characteristics of ashes formed at burning oil shale at temperatures 500, 600, 700, 800, 900 and 1030 °C were studied. Standard procedures were used to determine both pozzolanic activity and binding parameters. The most suitable characteristics were provided with oil shale ash formed at 700 °C. Ashes (15 and 30%) were added to ordinary Portland cement. The optimum pozzolan...

The aim of this study was to evaluate the chemical resistance and mechanical properties cement class G with n-SiO 2 addition after being exposed CO -saturated water at HPHT, simulating geological carbon storage condition. Four different amounts (0.5, 1, 1.5 3 wt%) a standard (STD Cement) were tested 150 bar 90 °C for 7 56 days. workability slurries evaluated by mini slump test helium gas pycnom...

Radioactive isotopes were first applied to investigate industrial problems some sixty years ago and since then, there has been a continuous expansion in their usage. The oil industry, in particular, was quick to recognise the potential usefulness of this technology and one of the earliest industrial studies in the literature is concerned with the use of radioactive material to tag the cement of...