Research Progress and Prospect of Coiled Tubing Operation Technology in Ultra⁃Deep Well

doi:10.12422/j.issn.1672-6952.2024.05.008

Abstract

Abstract:

In oil and gas extraction, coiled tubing technology has attracted much attention because of its advantages such as fast operation time, little damage to the formation low labor intensity, etc. The research of coiled tubing technology is a systematic project involving many aspects. This paper first starts the discussion from the domestic and international literature published and the main research scholars review the development process of coiled tubing technology, and summarise the relevant achievements existing in China. At present, the coiled tubing technology is in the stage of rapid development, but the research of coiled tubing in ultra-deep wells is minimal. The authors describe the relevant research carried out by the team on the downhole accessibility of coiled tubing in ultra-deep wells, the extension of the horizontal section of coiled tubing, the optimization of the construction parameters of coiled tubing operation, and the downhole safety assessment of coiled tubing operation. According to the current status of coiled tubing technology research in ultra-deep wells, it is suggested to carry out the research related to the real-time warning technology of coiled tubing fatigue life based on the digital intelligence technology, the ability of tractor?driven coiled tubing extension, and the research and development of high?temperature?resistant tools and fluids, to solve the technical difficulties of coiled tubing operation in ultra-deep wells.

Key words: Coiled tubing operation technology, Ultra-deep wells, Digital intelligence technology, Tractor?driven, High temperature and pressure

摘要：

在油气开采过程中，连续管作业因具有作业速度快、对地层伤害小、劳动强度低等优势而备受行业关注，连续管作业的研究是一个系统工程，涉及多个方面。从国内外文献发表的情况以及主要研究学者开始论述，回顾了连续管作业的发展过程，并对目前国内现有的相关成果进行了归纳总结。目前，连续管作业正处于快速发展阶段，但针对连续管在超深井应用进行的研究很有限。阐述了在超深井连续管下入性、连续管水平段延伸、连续管作业施工参数优化、连续管作业井下安全评估等方面开展的相关研究。根据超深井连续管作业研究现状，建议开展基于数智技术的连续管疲劳寿命实时预警技术、牵引器带动连续管延伸能力、耐高温工具和液体研发等方面的研究，解决连续管在超深井作业的技术难题。

关键词: 连续管作业技术, 超深井, 数智技术, 牵引器, 高温高压

CLC Number:

TE938

Shaohu LIU, Suonan WANG, Baolong QU, Lei ZHANG, Rui HUANG. Research Progress and Prospect of Coiled Tubing Operation Technology in Ultra⁃Deep Well[J]. Journal of Liaoning Petrochemical University, 2024, 44(5): 54-60.

刘少胡, 王锁男, 曲宝龙, 张磊, 黄瑞. 超深井连续管作业技术研究进展与展望[J]. 辽宁石油化工大学学报, 2024, 44(5): 54-60.

Figures/Tables 10

Fig.1 Coiled tubing technology and ultra?deep well coiled tubing technology published at home and abroad duiring 2001-2024

Fig.2 Statistical results of the application of coiled tubing technology in deep and ultra?deep wells

Fig.3 The literature on coiled tubing technology and ultra?deep well coiled tubing technology published in China duiring 1984-2024

Fig.4 The sources of domestic literature on coiled tubing technology are distributed duiring 1984-2024

Fig.5 Number of papers on coiled tube technology published by domestic academic teams

Fig.6 Axial force distribution of coiled tubing up and down in well DX1

Fig.7 The depth of coiled pipe is increased when the fluid density， the traffic and the rotor eccentricity are different

Table 1 DX2 well pump pressure calculation required parameters

参数	数值	因素	数值
$ρ$ ₂₅/（kg $⋅$ m^-3）	1 030	流变系数/（Pa·s ⁿ ）	0.039 9
流体指数	0.585	滚筒直径/m	2.032
连续管外径/mm	50.8	连续管当量壁厚/mm	4.881
连续管总长度/m	8 500	钻井深度/m	8 000
套管内径/mm	118.62	滚筒宽度/m	2.032
井口压力/MPa	15	工具串长度/m	7.09
流量/（L $⋅$ min^-1）	350

Table 1 DX2 well pump pressure calculation required parameters

参数	数值	因素	数值
$ρ$ ₂₅/（kg $⋅$ m^-3）	1 030	流变系数/（Pa·s ⁿ ）	0.039 9
流体指数	0.585	滚筒直径/m	2.032
连续管外径/mm	50.8	连续管当量壁厚/mm	4.881
连续管总长度/m	8 500	钻井深度/m	8 000
套管内径/mm	118.62	滚筒宽度/m	2.032
井口压力/MPa	15	工具串长度/m	7.09
流量/（L $⋅$ min^-1）	350

Fig.8 Pressure distribution of annular section and inside the pipe of continuous tube in well DX2

Fig.9 Stress limit diagram of coiled pipe under combined action of internal and external pressure and axial force

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