Study on Workover Fluid Suitable for High Temperature, High Pressure and Low Permeability Reservoirs in Offshore Gas Field

LIANG Yukai; LUO Gang; ZHOU Yuxia; SONG Jifeng; ZHENG Huaan; REN Kunfeng; LIN Kexiong

doi:10.12358/j.issn.1001-5620.2022.05.018

Volume 39 Issue 5

Jan. 2023

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LIANG Yukai, LUO Gang, ZHOU Yuxia, et al.Study on workover fluid suitable for high temperature, high pressure and low permeability reservoirs in offshore gas field [J]. Drilling Fluid & Completion Fluid，2022, 39（5）：654-660 doi: 10.12358/j.issn.1001-5620.2022.05.018

Citation:

LIANG Yukai, LUO Gang, ZHOU Yuxia, et al.Study on workover fluid suitable for high temperature, high pressure and low permeability reservoirs in offshore gas field [J]. Drilling Fluid & Completion Fluid，2022, 39（5）：654-660 doi: 10.12358/j.issn.1001-5620.2022.05.018

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Study on Workover Fluid Suitable for High Temperature, High Pressure and Low Permeability Reservoirs in Offshore Gas Field

doi: 10.12358/j.issn.1001-5620.2022.05.018

1.
CNOOC China Limited, Hainan Branch, Haikou, Hainan 570311
2.
Huhei Oilfield Chemical Industry Technology Research Institute, Jingzhou, Hubei 434000

Received Date: 2022-04-06
Accepted Date: 2022-05-12
Rev Recd Date: 2022-04-27
Publish Date: 2023-01-10

Abstract

Abstract

In view of the problems that workover fluid is easy to cause pollution damage to reservoir and serious corrosion to downhole pipe string during workover operation in a high-temperature, high-pressure and low-permeability gas field on the sea, the laboratory is based on soluble composite salt weighting material HGBZ, combined with high-temperature corrosion inhibitor HSJ-S, temperature and salt resistant waterproof agent HAD-2 and high-temperature bonding agent HJH-2, A set of dual maintenance high temperature and high density workover fluid system suitable for offshore high temperature, high pressure and low permeability gas fields is developed, and its comprehensive performance is evaluated. The results show that the basic performance of the workover fluid system is good, and the density is adjustable between 1.03-1.80 g/cm³; Workover fluid has good anti-corrosion effect, and the corrosion rate of downhole equipment steel is less than 0.076 mm/a; The workover fluid has a good anti swelling effect on clay minerals in the reservoir section of the target gas field, and the anti-swelling rate can reach more than 95%; Workover fluid has good compatibility with formation water in reservoir section and will not produce crystallization precipitation, etc; Workover fluid system can effectively reduce the self-absorption water of natural core, and the permeability recovery value of natural core polluted by workover fluid can reach more than 90% under high temperature for a long time, which has good reservoir protection effect. Well X uses the dual protection high temperature and high density workover fluid system, the workover process is smooth, there is no downhole complex accident, and the productivity recovery rate is high after workover, indicating that the dual protection high temperature and high density workover fluid system studied can meet the workover requirements of offshore high temperature, high pressure and low permeability gas fields.
- Offshore gas field,
- Low permeability reservoir,
- High temperature and high pressure,
- Workover fluid,
- Reservoir protection

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References

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Study on Workover Fluid Suitable for High Temperature, High Pressure and Low Permeability Reservoirs in Offshore Gas Field

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Study on Workover Fluid Suitable for High Temperature, High Pressure and Low Permeability Reservoirs in Offshore Gas Field

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