The challenges created by HPHT conditions make drilling and cementing difficult. overwhelming challenge stands for materials used wells operated at higher temperature pressures in the face of producing downhole. There is need better choice cement operations during development production wells. review method adopted this article considering Calcium Oxide which poses as good expander. In paper, a...

With its exceptional strength characteristics, diamond has some mechanical drawbacks, significant brittleness being among them. In particular, HPHT-grown diamonds crack when the extreme parameters inherent to growth process gradually decrease. The cracking is caused by excessive stress due poor plastic properties of catalytic medium at certain stages reducing pressure and temperature. An insula...

Із застосуванням методу рентгенівської дифракції докладно досліджено кристалічну структуру карбіду титану (TiC), який поряд із супутніми фазами міститься в продуктах механохімічного синтезу шихти складу 80 мол. % TiC та 20 ZrC, а також у композитах, отриманих HPHT спіканням (7,7 ГПа, 1750—2300 °С) 60 об. cBN, 25 TiC, 10 ZrN 5 Al. Встановлено, що результаті твердофазної взаємодії з ZrC або (моля...

The linear response of a radiation dosimeter with absorbed dose rate is a principal requirement in radiotherapy. Fowler's model for electrical conductivity, s of a solid-state detector and absorbed dose rate, Dr is of the form σ ∝ Δ Dr where Δ is the linearity index that can take on a range of values around unity. Utilising synthetic diamond detectors of various types as sensors, this study inv...

Crystallization of diamond in the Mg-Si-C system has been studied at 7.5 GPa and 1800 ◦C with the Mg-Si compositions spanning the range from Mg-C to Si-C end-systems. It is found that as Si content of the system increases from 0 to 2 wt %, the degree of the graphite-to-diamond conversion increases from about 50 to 100% and remains at about this level up to 20 wt % Si. A further increase in Si c...