The Field Application of a Drilling Fluid for a Two-Interval Horizontal Well Penetrating Tight Gas Reservoir

KONG Weisheng; LI Xiaoming; HAN Chengfu; QU Yanping; WANG Qingchen; ZHAO Peng

doi:10.12358/j.issn.1001-5620.2023.01.010

Volume 40 Issue 1

Jan. 2023

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KONG Weisheng, LI Xiaoming, HAN Chengfu, et al.The field application of a drilling fluid for a two-interval horizontal well penetrating tight gas reservoir[J]. Drilling Fluid & Completion Fluid，2023, 40（1）：73-81 doi: 10.12358/j.issn.1001-5620.2023.01.010

Citation:

KONG Weisheng, LI Xiaoming, HAN Chengfu, et al.The field application of a drilling fluid for a two-interval horizontal well penetrating tight gas reservoir[J]. Drilling Fluid & Completion Fluid，2023, 40（1）：73-81 doi: 10.12358/j.issn.1001-5620.2023.01.010

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The Field Application of a Drilling Fluid for a Two-Interval Horizontal Well Penetrating Tight Gas Reservoir

doi: 10.12358/j.issn.1001-5620.2023.01.010

CCDC Changqing General Drilling Company, Xi´an, Shaanxi 710018

Received Date: 2022-09-09
Rev Recd Date: 2022-10-11
Publish Date: 2023-01-31

Abstract

Abstract

Two-interval horizontal well profile is used to develop the tight gas reservoirs in the Sulige gas field. Downhole problems such as coexistence of borehole wall collapse and mud losses, high friction and poor hole cleaning have long remained difficulties during drilling operations. Based on the analyses of the geological characteristics and the collapse mechanisms of shale formations, a model for friction and torque calculation is developed. The changes of friction and torque between different well profiles are compared. A new drilling fluid with good plugging capacity and lubricity was developed with a nanophase emulsion, plugging agents o hard and soft particles, compound lubricants and high efficiency gel strength additives which were all selected through laboratory experiment. This drilling fluid has been successfully applied in field operations. Laboratory study has shown that this drilling fluid has good inhibitive capacity and good plugging capacity, and it can extend the instability period of hard and brittle shales, thereby maintaining the borehole wall stable. This drilling fluid also has good rheology and lubricity, low sand content and solid content. In field application, the resistance to casing string running into the hole was controlled within 350 kN, the friction to drilling string running into the hole was reduced by 24.21%, the torque was reduced by 34.31%, the average drilling time was 29.04 d, the average ROP was 17.64 m/h, which was 36.5% higher than that in drilling three-interval horizontal wells. Time spent in reaming because of borehole collapse was reduced by 89.50%. This drilling fluid has provided a powerful technical support for promoting the application of two-interval horizontal drilling in developing the tight gas reservoirs in the Sulige gas field.
- Tight gas reservoir,
- Two-interval horizontal well,
- Drilling fluid system,
- Nanophase emulsion,
- Reduce friction and torque,
- Coexistence of borehole collapse and mud loss

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References(21)

References

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The Field Application of a Drilling Fluid for a Two-Interval Horizontal Well Penetrating Tight Gas Reservoir

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