Mechanisms of Borehole Instability of the Shaximiao Formation in Block Zhongjiang and the Anti-collapse Alkyl Glycoside Drilling Fluid

CHEN Wenke; ZHENG He; GONG Houping; XU Chuntian; CAI Wei; SHI Shuijian; ZHOU Chengyu; BAO Dan

doi:10.12358/j.issn.1001-5620.2023.04.004

Volume 40 Issue 4

Jul. 2023

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Article Navigation > DRILLING FLUID & COMPLETION FLUID > 2023 > 40(4): 438-445

CHEN Wenke, ZHENG He, GONG Houping, et al.Mechanisms of borehole instability of the Shaximiao formation in block Zhongjiang and the anti-collapse alkyl glycoside drilling fluid[J]. Drilling Fluid & Completion Fluid，2023, 40（4）：438-445 doi: 10.12358/j.issn.1001-5620.2023.04.004

Citation:

CHEN Wenke, ZHENG He, GONG Houping, et al.Mechanisms of borehole instability of the Shaximiao formation in block Zhongjiang and the anti-collapse alkyl glycoside drilling fluid[J]. Drilling Fluid & Completion Fluid，2023, 40（4）：438-445 doi: 10.12358/j.issn.1001-5620.2023.04.004

Citation:

CHEN Wenke, ZHENG He, GONG Houping, et al.Mechanisms of borehole instability of the Shaximiao formation in block Zhongjiang and the anti-collapse alkyl glycoside drilling fluid[J]. Drilling Fluid & Completion Fluid，2023, 40（4）：438-445 doi: 10.12358/j.issn.1001-5620.2023.04.004

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Mechanisms of Borehole Instability of the Shaximiao Formation in Block Zhongjiang and the Anti-collapse Alkyl Glycoside Drilling Fluid

doi: 10.12358/j.issn.1001-5620.2023.04.004

CHEN Wenke^1
,,
ZHENG He¹,
GONG Houping¹,
XU Chuntian¹,
CAI Wei¹,
SHI Shuijian¹,
ZHOU Chengyu^{2, 3
,
,},
BAO Dan^{2, 3}

1.
Jiangsu Drilling Company of Huadong Petroleum Engineering Co., Ltd., Sinopec, Yangzhou, Jiangsu 225261
2.
Chongqing University of Science and Technology , School of Chemistry and Chemical Engineering, Chongqing 401331
3.
Chongqing Oil and Gas Field Chemical Engineering Technology Research Center, Chongqing 401331

Received Date: 2023-03-21
Rev Recd Date: 2023-05-12
Publish Date: 2023-07-30

Abstract

Abstract

Borehole wall instability has long been a problem encountered in drilling the Shaximiao formation in the block Zhongjiang, western Sichuan. To solve this problem, the claystones from the Shaximiao formation was studied for their mineral composition, microstructure and physical-chemical properties. The study results have revealed the mechanisms of borehole wall instability of the Shaximiao formation. The Shaximiao formation is a typical hard and brittle rock with high content of clay minerals (mostly illite) which are strongly hydratable. The formation is developed with plenty of micrometer- and nanometer-sized fractures, which will expand continually when mud filtrate invasion take place and finally, collapse. The inhomogeneous distribution of illite and illite/montmorillonite mixed layer in the rocks, high specific water absorptivity and high repulsive force of the hydration films have made the expansion of the microfractures even worse. An alkyl glycoside inhibitive agent and a nanometer plugging agent were selected to formulate a high-performance anti-collapse drilling fluid based on the “Multivariate collaboration” borehole stabilization theory. Laboratory experiment on the performance of this drilling fluid has shown that this drilling fluid has good rheology, API filter loss of less than 3 mL, HTHP filter loss of 8 mL or less, percent cuttings recovery of 98.87%, swelling rate of less than 3%. These data indicate that the drilling fluid has good inhibitive capacity and good capacity of plugging the microfractures and micropores. Field application has shown that the alkyl glycoside drilling fluid can effectively inhibit the collapse of the Shaximiao formation. High ROP was obtained with this drilling fluid, and no downhole troubles have been encountered. The use of the alkyl glycoside drilling fluid has provided a technical support to safely, efficiently and economically drill the Shaximiao formation.
- Anti-collapsing drilling fluid,
- Borehole instability,
- Shaximiao Formation,
- Formation collapse,
- Microstructure

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References(17)

References

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Mechanisms of Borehole Instability of the Shaximiao Formation in Block Zhongjiang and the Anti-collapse Alkyl Glycoside Drilling Fluid

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Mechanisms of Borehole Instability of the Shaximiao Formation in Block Zhongjiang and the Anti-collapse Alkyl Glycoside Drilling Fluid

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