Gas migration through cement slurries analysis: A comparative laboratory study | ||
| International Journal of Mining and Geo-Engineering | ||
| مقاله 10، دوره 49، شماره 2، 2015، صفحه 281-288 اصل مقاله (439.2 K) | ||
| نوع مقاله: Research Paper | ||
| شناسه دیجیتال (DOI): 10.22059/ijmge.2015.56113 | ||
| نویسندگان | ||
| Arian Velayati* 1؛ Ezatallah Kazemzadeh2؛ Hamid Soltanian1؛ Behzad Tokhmechi1 | ||
| 1School of Mining, Petroleum and Geophysics Engineering; University of Shahrood, Iran | ||
| 2Research Institute of Petroleum Industry, Iran | ||
| چکیده | ||
| Cementing is an essential part of every drilling operation. Protection of the wellbore from formation fluid invasion is one of the primary tasks of a cement job. Failure in this task results in catastrophic events, such as blow outs. Hence, in order to save the well and avoid risky and operationally difficult remedial cementing, slurry must be optimized to be resistant against gas migration phenomenon. In this paper, performances of the conventional slurries facing gas invasion were reviewed and compared with modified slurry containing special gas migration additive by using fluid migration analyzer device. The results of this study reveal the importance of proper additive utilization in slurry formulations. The rate of gas flow through the slurry in neat cement is very high; by using different types of additives, we observe obvious changes in the performance of the cement system. The rate of gas flow in neat class H cement was reported as 36000 ml/hr while the optimized cement formulation with anti-gas migration and thixotropic agents showed a gas flow rate of 13.8 ml/hr. | ||
| کلیدواژهها | ||
| compressive strength؛ Fluid loss؛ Gas migration؛ Gel strength؛ Hydrostatic pressure | ||
| مراجع | ||
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