Aplication of Local Cement for Cementing Oil Wells in the South Eastern Region of the Pannonian Basin

Abstract

Wells conditions are different in wide range of temperature and depth. Cement slurries in such conditions have to remain pumpable and after setting to stay homogenous in production well life. For cementing operations in wide range of temperature and pressure and to accommodate cement slurries for individual well requirements more than 50 additives are now used for various API classes of cement. Laboratory in NIS -National oil company of Serbia, provides cement analysis of dry cement, tests on cement slurries and cement stone in compliance with methods prescribed by API standard, whereby quality and type of equipment fully meet the requirements. Adaptation of the local cement to the well conditions had already been done by these additives and by numerous tests of pure cement and cement mixtures we developed a palette of typical cement mixtures for cementing oil wells in the south eastern region of the Pannonian basin.

Comparative Study of Local Cements with Imported Class G Cement at Different Temperatures for Oil Well Cementing Operations in Ghana

“…Again, the fluid loss results for all the cement samples compared favourably with the recommended values reported by Boškovic et al [25]. According to Boškovic et al [24], filtrate (fluid) loss for class G cement is not precisely defined by API Specification, but recommended that within thirty (30) minutes test period up to 1000 cc (ml), 500 cc (ml), less or equal to 100 cc (ml) and 30-50 cc (ml) respectively is vital for cementing technical casing string, production casing string, liner casing and gas wells.…”

“…According to Anon [24], under standard laboratory conditions (6.9 MPa (1 000 psi) filter pressure, with a 325 mesh filter) a slurry for a squeeze job and primary cement job should give a fluid loss of 50-200 cc (ml) and 250-400 cc (ml) within thirty (30) minutes respectively. Again, the fluid loss results for all the cement samples compared favourably with the recommended values reported by Boškovic et al [25].…”