Drilling in Gas Hydrates: Managing Gas Appearance Risks

Ruslan Gizatullin, Mikhail Dvoynikov, Natalya Romanova () and Victor Nikitin
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Ruslan Gizatullin: Saint Petersburg Mining University, 199106 Saint Petersburg, Russia
Mikhail Dvoynikov: Saint Petersburg Mining University, 199106 Saint Petersburg, Russia
Natalya Romanova: Saint Petersburg Mining University, 199106 Saint Petersburg, Russia
Victor Nikitin: PJSC Gazprom, 197229 Saint Petersburg, Russia

Energies, 2023, vol. 16, issue 5, 1-13

Abstract: This article provides a detailed analysis of issues related to the complications while drilling in hydrate-bearing rocks of permafrost areas. The goal of the paper is to develop recommendations for preventing gas occurrence while drilling gas hydrate deposits and to eliminate gas leakiness of the intercasing space of the well. The results of modeling the effect of drilling mud injection on the temperature field of the well are presented. It is revealed that the most significant role is played by the injection rate of drilling mud and its temperature. The recommended flow rate of the process fluid should be within 0.30–0.45 m 3 /s, and its temperature should not exceed 20 °C. Controlling the parameters of drilling mud and its flow rate allows for avoiding intensive gas occurrence while drilling in gas hydrates. The presence of gas hydrates may be the cause of gas leakiness of the intercasing space in the permafrost area. One of the ways to eliminate leakiness is colmatation (clogging). A method of preventing leaks in the intercasing space of the gas well is the use of colmatating solution. An aqueous solution of sodium silicate with the addition of 2% polymer is used as a colmatating composition.

Keywords: gas hydrates; complications; permafrost area; temperature field; thermal conductivity (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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