Gas migration through cement slurries analysis: A comparative laboratory study

سال انتشار: 1394
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 657

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شناسه ملی سند علمی:

JR_IJMGE-49-2_010

تاریخ نمایه سازی: 15 شهریور 1395

چکیده مقاله:

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.

نویسندگان

Arian Velayati

School of Mining, Petroleum and Geophysics Engineering; University of Shahrood, Iran

Ezatallah Kazemzadeh

Research Institute of Petroleum Industry, Iran

Hamid Soltanian

School of Mining, Petroleum and Geophysics Engineering; University of Shahrood, Iran

Behzad Tokhmechi

School of Mining, Petroleum and Geophysics Engineering; University of Shahrood, Iran