| Title | The Effect of Expanding Additives to Improve Cement Isolation Strength to 250?C and 2000 psi Conditions |
|---|---|
| Authors | Suhascaryo Nur, Rubiandini Rudi RS, Septoratno Siregar, Dody Nawangsidi |
| Year | 2005 |
| Conference | World Geothermal Congress |
| Keywords | Expanding Additive, Shear Bond Strength, Compressive Strength, High Pressure-High Temperature, Curing Time |
| Abstract | Cementing is a very important part in oil-well drilling, the recent technologies development in oil-well drilling has led to a more problematic case in cementing. High temperature cementing is one of those problem, high temperature cementing consists of steam recovery wells, geothermal wells and ultra deep wells. The use of expanding cements for improving the sealing efficacy of Annulus cementing has been considered for a long time as a possible solution to existing problems. CaO and MgO had been proposed as two of the most effective additives to create good expanding cement. The purposes of this study are to find the effect of burnt pure CaO and MgO addition on the value of compressive strength and shear bond strength of API class G in high pressure and high temperature condition. The method applied on this research was by evaluating the data taken from simulator which was simulate with 100-250oC temperature and 2000 psi pressure. The conclusions taken according to the results are: The addition of CaO and MgO will increase the shear bond strength and the compressive strength on specific condition up to 200oC temperature. The addition will be ineffective for the 250oC condition. The cement strength behavior will be also affected by the length of curing time. This expanding cement needs some further research for other composition, temperature and curing time condition. The compatibility when mixed with other additives beside silica flour hasn't been figured out yet. |