Design and Evaluation of an Integrated Drilling and Completion Fluid

XU Jie; XU Lin; LI Xiwen; KOU Lei; XU Mingbiao

doi:10.12358/j.issn.1001-5620.2023.02.006

Volume 40 Issue 2

Mar. 2023

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XU Jie, XU Lin, LI Xiwen, et al.Design and evaluation of an integrated drilling and completion fluid[J]. Drilling Fluid & Completion Fluid，2023, 40（2）：184-192 doi: 10.12358/j.issn.1001-5620.2023.02.006

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XU Jie, XU Lin, LI Xiwen, et al.Design and evaluation of an integrated drilling and completion fluid[J]. Drilling Fluid & Completion Fluid，2023, 40（2）：184-192 doi: 10.12358/j.issn.1001-5620.2023.02.006

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Design and Evaluation of an Integrated Drilling and Completion Fluid

doi: 10.12358/j.issn.1001-5620.2023.02.006

XU Jie^1
,,
XU Lin^{2
,
,},
LI Xiwen¹,
KOU Lei¹,
XU Mingbiao^{3, 4}

1.
Haikou Marine Geological Survey Center, China Geological Survey, Haikou, Hainan 571127
2.
School of Petrochemical Engineering and Environment, Zhejiang Ocean University, Zhoushan, Zhejiang 316022
3.
College of Petroleum Engineering, Yangtze University, Wuhan, Hubei 430100
4.
Cooperative Innovation Center of Unconventional Oil and Gas, Wuhan, Hubei 430100

Received Date: 2022-11-05
Accepted Date: 2022-12-10
Rev Recd Date: 2022-12-01
Publish Date: 2023-03-30

Abstract

Abstract

The integrated drilling and completion fluid is the development of the traditional drill-in fluid used in offshore open hole drilling. The formulation of this new-generation drill-in fluid is based on the D₉₀ empirical rule and the membrane shielding principle, and the concept of low-shear-rate viscosity is used. The insertion of temporary plugging agent particles and film-forming at the pore entrance of the formation rocks form a unidirectional shielding ring, which not only protects the reservoir from being damaged, but also can be flowed back directly, thereby simplifying the well completion procedure. This paper describes the design of the new-generation drill-in fluid as well as the experiment for examining the micro structure of the key components and the basic performance of the drill-in fluid. Experiments on the reservoir protection performance of the drill-in fluid show that the flexible and the rigid temporary-plugging particles in the drill-in fluid plug the pore entrances in a synergetic way, promoting the formation of the unidirectional shielding ring. Of the temporary-plugging particles, the rigid particles have irregular shapes, with median particle size of 9.5 μm, which is greater than the sizes of the pores; whereas the flexible film-forming particles are in regular spherical shapes with average particle size of 25.4 μm, the narrow size distribution of the flexible particles is beneficial to inter-particle filling and deformation coalescence. The drill-in fluid has good rheology at temperatures between 5 ℃ and 130 ℃, and its average low-shear-rate viscosity is 30,802 ± 1,892 mPa∙s, which satisfy the needs of flowback and block removal. The drill-in fluid has good lubricity, high inhibitive capacity and high resistance to seawater and drilled cuttings contamination. It is a good one-way plugging agent and direct flowback operation produces a high permeability recovery. Field application of this drill-in fluid indicated that the drilling of the reservoir section was smooth and successful, the requirements of direct flowback were satisfied, and the procedure of completing the well was simplified.
- Well drilling and completion,
- Integrated working fluid,
- Direct flowback,
- Reservoir protection,
- Unidirectional shielding ring

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References

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Design and Evaluation of an Integrated Drilling and Completion Fluid

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