Borehole enlargement rate as a measure of borehole instability in hydrate reservoir and its relationship with drilling mud density

Springer Science and Business Media LLC - 2021
Qingchao Li1, Lingling Liu2, Bo Yu3, Linian Guo2, Sheng Shi3, Linchun Miao3
1School of Energy Science and Engineering, Henan Polytechnic University, Henan, 454000, Jiaozuo, China
2Petrochina Changqing Oilfield Company Oil Production Plant No. 10, Xian, 710000, China
3Petrochina Changqing Oilfield Company Oil Production Plant No. 7, Xian, 710000, China

Tóm tắt

AbstractBorehole collapse will pose a threat to the safety of equipment and personnel during drilling operation. In this paper, a finite element multi-field coupling model for investigating borehole collapse in hydrate reservoir was developed. In this model, fluid seepage, heat transfer, hydrate dissociation and borehole deformation are all considered. Based on which, effects of drilling fluid density on both of hydrate dissociation and borehole collapse are investigated. The investigation results show that disturbance of drilling fluid invasion to hydrate reservoir will lead to hydrate dissociation around wellbore, and dissociation range narrows obviously with the increase in drilling fluid density. When the relative fluid density is 0.98, natural gas hydrates in reservoir with a width of about 16.65 cm around wellbore dissociate completely. However, dissociation range of natural gas hydrate has decreased to 12.08 cm when the relative fluid density is 1.10. Moreover, hydrate dissociation around wellbore caused by drilling fluid invasion may lead to borehole collapse, and borehole collapse can be significantly restrained with the increase in relative fluid density. Borehole enlargement rate is 33.67% when the relative fluid density is 0.98, but nearly no collapse area displays around wellbore when the relative fluid density increases to 1.12. In addition, investigation herein can provide an idea for designing drilling fluid density in hydrate reservoir when different allowable borehole enlargement rate is considered. The minimum fluid density designed for avoiding disastrous borehole collapse increases nonlinearly when higher requirements for borehole stability are proposed.

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