Completion Technologies for HTHP Gas Fields in the Yinggehai Basin

HUANG Liang1 WEI Anchao1 WANG Erjun1 XU Jing1 ZHANG Chao1 FENG Xuesong2

(1.CNOOC China Limited, Zhanjiang Branch, Zhanjiang, Guangdong, China 524057)
(2.Zhanjiang Branch, CNOOC EnerTech Drilling & Production Co., Zhanjiang, Guangdong, China 524057)

【Abstract】The F Gas Field in Yinggehai Basin of the South China Sea is an HTHP gas field, and its characteristics of high temperature, high pressure and high CO2 content have been the challenge to the integrity of wellbore, so the completion method was selected pertinently according to the characteristics of reservoirs. Based on the principle of keeping both the safety and the economy, the tubing/casing was made by modified 13Cr material, and different types of production strings were designed. In terms of the characteristics of gas field and the development requirements, the selection of wellhead Christmas trees and downhole tools was carried out properly; the perforation pipe string was designed; and the proper annulus protection fluid was developed. In the end, a completion technology suitable for the development of HTHP offshore gas fields with high acidic gas content was formed. This completion technology has been applied in more than 10 wells of this gas field, and no sustained annulus pressure was observed during the production process, which indicated that the developed completion technology could effectively ensure the wellbore integrity of such gas fields and provide supports for the large-scale development of HTHP gas fields in the Yinggehai Basin.

【Keywords】 high temperature; high pressure; high CO2 content; completion; production string; corrosion prevention; Yinggehai Basin;

【DOI】

【Funds】 National Science and Technology Major Project of “HTHP Gas Enrichment Principle and Key Exploration and Development Technologies in the Yinggehai Basin (Phase III)”(2016ZX05024-005) CNOOC’s Major Scientific Research Project of “Study on Key HTHP Completion and Testing Technologies in the Yinggehai Basin” (CNOOC-KJ 135ZDXM24LTDZJ03)

Download this article

    References

    [1] LI Zhong. Status and prospect of key drilling and completion technologies for the development of HTHP gasfield in South China Sea [J]. Oil Drilling & Production Technology, 2016, 38 (6): 730–736 (in Chinese).

    [2] GU Xiaohong, MU Jianmin, SHI Junsheng, et al. Diagnosing and managing on risk of annular casing pressure in high-sulfur gas well of Puguang Gas Field [J]. Fault-Block Oil & Gas Field, 2013, 20 (5): 663–666 (in Chinese).

    [3] ZHANG Zhi, GU Nan, YANG Hui, et al. Safety assessment of annular pressure in gas wells with high sulphur production [J]. Drilling & Production Technology, 2011, 34 (1): 42–44, 115 (in Chinese).

    [4] HE Shenghou. Technical difficulties and Countermeasures for development of Puguang Gas Field with high H2S and CO2 content [J]. Natural Gas Industry, 2008, 28 (4): 82–85 (in Chinese).

    [5] LOU Yishan, LIU Xinfeng, LI Zhonghui. Research on the influence of pressure attenuation on the critical production pressure differential during oil recovery [J]. Drilling & Production Technology, 2006, 29 (3): 40–41 (in Chinese).

    [6] VAZIRI H, XIAO Y, PALMER I. Assessment of several sand prediction models with particular reference to HPHT wells [R]. SPE78235, 2002.

    [7] Q/HS14010-2011 Quality control requirements for offshore well completion engineering[S].

    [8] WEN Min, HE Baosheng, WANG Pingshuang, et al. Optimal design of production casing string for offshore HPHT gas wells [J]. Journal of Oil and Gas Technology, 2014, 36 (11): 234–238 (in Chinese).

    [9] GUO Jianhua, SHE Chaoyi, TANG Geng, et al. Optimal design and application of completion strings in a HTHP gas well [J]. Natural Gas Industry, 2011, 31 (5): 70–72 (in Chinese).

    [10] ZHANG Chong, HUANG Liang, REN Guanlong, et al. Safety design of well completion string in offshore HTHP well [J]. Science Technology and Engineering, 2016, 16 (12): 248–253 (in Chinese).

    [11] CHE Zheng’an, ZHANG Zhi, SHI Taihe, et al. Mechanism of annular fluid thermal expansion pressure in HTHP sour gas wells [J]. Natural Gas Industry, 2010, 30 (2): 88–90 (in Chinese).

    [12] ISO 14310-2008 Petroleum and natural gas industries: downhole equipment: packers and bridge plugs [S].

    [13] ISO 13679-2002 Petroleum and natural gas industries: procedures for testing and tubing connections [S].

    [14] API SPEC 6A-2018 Specification for wellhead and tree equipment [S].

    [15] GAO Yongde, WANG Shuhua, WANG Xianchao, et al. Assessment packer in perforating string in safety distance [J]. Well Logging Technology, 2016, 40 (3): 382–384 (in Chinese).

    [16] WANG Erjun, WEI Anchao, SHU Fuchang, et al. Study on CO2 corrosion resitiance of packer fluid under high pressure and high temperature in Dongfang 1-1 Gas Field [J]. Oil Drilling & Production Technology, 2016, 38 (6): 813–816 (in Chinese).

This Article

ISSN:1001-0890

CN:11-1763/TE

Vol 47, No. 06, Pages 21-26

November 2019

Downloads:3

Share
Article Outline

Abstract

  • 1 Difficulties of completion technologies
  • 2 Key completion technologies
  • 3 Field applications
  • 4 Conclusions
  • References