Research on Managed Pressure Casing Technology in Narrow Safety Pressure Window Formation

doi:10.11885/j.issn.1674-5086.2020.10.12.03

Abstract

Abstract: Aiming at the problem of high loss risk of casing running in narrow safety pressure window formation, based on transient surge pressure, a wellbore pressure control model for casing running in narrow safety pressure window formation is established, and then a precise pressure control method for casing running is proposed. Firstly, the sensitivity analysis of casing surge pressure is carried out by using the transient surge pressure model. The results show that the higher the casing running speed, the deeper the casing sinking depth, the greater the drilling fluid density and the smaller the annulus clearance, the greater the bottom-hole surge pressure caused by casing. A case study of casing running under precise pressure control shows that this method can not only ensure casing running speed, but also effectively avoid loss in narrow safe pressure window formation. In addition, by comparing the precise pressure control casing running with the conventional casing running, it is found that the maximum speed adjustment range of casing running is very narrow when the casing running with the conventional method is near the bottom of the well, which makes it difficult to maintain the wellbore pressure within the safety pressure window.

Key words: casing running, narrow safety pressure window, transient surge pressure, precise managed pressure, lost circulation

CLC Number:

TE256

XU Bihua, LI Junfu, LI Bin, TIAN Dongcheng, RAO Fujia. Research on Managed Pressure Casing Technology in Narrow Safety Pressure Window Formation[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2022, 44(6): 54-61.

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URL: http://journal15.magtechjournal.com/Jwk_xnzk/EN/10.11885/j.issn.1674-5086.2020.10.12.03

http://journal15.magtechjournal.com/Jwk_xnzk/EN/Y2022/V44/I6/54

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