Design of Nitrogen Injection Well String and Wellhead Device in Deep Reservoir of Jidong Oilfield

doi:10.11885/j.issn.16745086.2021.04.29.09

Abstract

Abstract: The Gao 5 Block of Jidong Oilfield has the characteristics of high reservoir pressure, large inclination of gas injection wells, and deep drilling of the pipe string. According to the current gas injection well structure, surface facilities and gas injection efficiency requirements, a commingled gas injection string structure scheme was designed. Self-programming of erosion model was used to optimize tubing size. The high temperature and high pressure dynamic corrosion simulation experiment was carried out under different working conditions to explore the wellbore corrosion mechanism of nitrogen injection wells and determine the influence of various factors on the corrosion rate. Finally, the remaining strength and service life of the pipe string were evaluated. The results showed that choosing ϕ73 mm and 13Cr tubing as the general gas injection string has a good service life under the influence of erosion and oxygen corrosion caused by nitrogen injection. Safety devices such as surface safety valves, can greatly reduce the safety risks of high-pressure gas injection wells. This design scheme can meet the production needs of deep nitrogen flooding in Jidong Oilfield and has a wide range of application prospects.

Key words: Jidong Oilfield, deep reservoir, nitrogen injection well, wellhead device, completion string

CLC Number:

TE355

HUANG Xiaomeng, WANG Lei, XU Jingjing, LU Haiwei, XING Lijie. Design of Nitrogen Injection Well String and Wellhead Device in Deep Reservoir of Jidong Oilfield[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2021, 43(4): 147-156.

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URL: http://journal15.magtechjournal.com/Jwk_xnzk/EN/10.11885/j.issn.16745086.2021.04.29.09

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