Large borehole drilling fluid technology for gas storage wells in Changqing Gas Field

ZHANG Qin

doi:10.12143/j.ztgc.2023.02.010

2023 Vol. 50, No. 2

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ZHANG Qin. 2023. Large borehole drilling fluid technology for gas storage wells in Changqing Gas Field. DRILLING ENGINEERING, 50(2): 72-79. doi: 10.12143/j.ztgc.2023.02.010

Citation:

ZHANG Qin. 2023. Large borehole drilling fluid technology for gas storage wells in Changqing Gas Field. DRILLING ENGINEERING, 50(2): 72-79. doi: 10.12143/j.ztgc.2023.02.010

Large borehole drilling fluid technology for gas storage wells in Changqing Gas Field

ZHANG Qin¹

Changqing Drilling Branch, CNPC Chuanqing Drilling Engineering Co., Ltd., Xi’an Shaanxi 710018, China

Received Date: 27 July 2022

Revised Date: 03 November 2022

Abstract

Abstract

Gas storage is an important means to reserve natural gas strategic resources and allocate natural gas production， which has good social and economic benefits. There are some problems in the drilling operation of gas storage， such as wellbore cleaning， wellbore instability， downhole leakage， etc. In view of such problems， the existing drilling fluid technology is optimized to effectively reduce the downhole complex and form a set of large wellbore drilling fluid technology for gas storage wells. After using this technology， the yield point of drilling fluid is over 0.3 Pa， which meets the needs of borehole cleaning. The finished drilling density is below 1.20 g/cm³， and the filtration loss is less than 6 mL， which ensures the borehole stability. The formation bearing capacity can be increased to the equivalent density of above 1.36 g/cm³ after using the supramolecular gel as sealing agent， the proportion of the lost time dealing with the complexity decreased from 10% to 5.26%， which meets the needs of gas storage construction.
- gas storage well /
- large borehole /
- drilling fluid technology /
- wellbore cleaning /
- anti-sloughing in coal bed /
- leak protection and plugging

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References

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