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Research on Bottom Water Coning Law of Jurassic Reservoir–Based on Kv/Kh Value Recognition

Taking Yan10 Reservoir in Block M of F Oilfieldin Ordos Basin as an Example

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Proceedings of the International Field Exploration and Development Conference 2023 (IFEDC 2023)

Part of the book series: Springer Series in Geomechanics and Geoengineering ((SSGG))

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Abstract

The ratio of vertical permeability (Kv) to horizontal permeability (Kh) of a reservoir (Kv/Kh) is crucial for studying the bottom water coning law of bottom water reservoirs, understanding the characteristics of horizontal and vertical water drive, and formulating reasonable development technical strategies. Through permeability analysis of 170 cores from the Jurassic bottom water reservoir in the Ordos Basin, it is found that the Kv/Kh values are generally distributed in a normal distribution, and there is a linear quantitative relationship between the two in a dual logarithmic coordinate system. Based on the distribution characteristics of Kv and Kh, the method of combining reservoir engineering with numerical simulation was applied to study the bottom water coning law of Yan10 Reservoir in Block M of F Oilfield,. The following understanding was obtained: (1) When other conditions are the same, the larger Kv/Kh, the faster the bottom water breakthrough time; (2) As Kv/Kh increases, the bottom water sweep efficiency gradually decreases. When Kv/Kh > 0.5, the magnitude of the decrease in sweep efficiency slows down as the value increases; (3) The baffle has a delaying effect on the bottom water coning, and the longer the baffle radius, the farther the baffle is from the oil-water interface, and the more obvious the delaying effect on the bottom water coning. These research results provide a basis for formulating reasonable development technology policies for Jurassic bottom water reservoirs.

Copyright 2023, IFEDC Organizing Committee.

This paper was prepared for presentation at the 2023 International Field Exploration and Development Conference in Wuhan, China, 20–22 September 2023.

This paper was selected for presentation by the IFEDC Committee following review of information contained in an abstract submitted by the author(s). Contents of the paper, as presented, have not been reviewed by the IFEDC Technical Team and are subject to correction by the author(s). The material does not necessarily reflect any position of the IFEDC Technical Committee its members. Papers presented at the Conference are subject to publication review by Professional Team of IFEDC Technical Committee. Electronic reproduction, distribution, or storage of any part of this paper for commercial purposes without the written consent of IFEDC Organizing Committee is prohibited. Permission to reproduce in print is restricted to an abstract of not more than 300 words; illustrations may not be copied. The abstract must contain conspicuous acknowledgment of IFEDC. Contact email: paper@ifedc.org.

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Abbreviations

K:

Average permeability of oil reservoir, 10–3 μ m2

φ:

Reservoir porosity,%

Kv:

Vertical permeability, 10–3 μ m2

Kh:

Horizontal permeability, 10–3 μ m2

h:

Reservoir thickness, m

hp:

Thickness of the perforated section of the oil reservoir, m

h2:

Thickness of the oil layer without perforation, m

r:

Distance from the wellbore axis, m

z:

Water cone height, m

t:

Oil well production time, d

ts:

Bottom water breakthrough time, d

q1:

Horizontal radial flow rate of the perforated section, m3/d

q2:

Spherical miscarriage in the unperforated section, m3/d

q:

Total oil well production, m3/d

re:

Oil well driving radius, m

rw:

Wellbore radius, m

Δp:

Production pressure difference, MPa

Δρwo:

Density difference between oil and water wells, kg/m3

L:

Length of horizontal section, m

hb:

Closed water height of the partition, m

μo:

Formation crude oil viscosity, mPa·s

Bo:

Volume coefficient of formation crude oil, constant

b:

Long axis radius of the elliptical discharge area of the horizontal well, m

reh:

Horizontal well drainage radius, m

rb:

Partition radius, m

Ns:

Oil recovery during the dry period, m3

x:

Perforation degree, decimal

xopt:

Optimal perforation degree, decimal

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Acknowledgments

The project is supported by China Petroleum science and technology major project (2016E-0508).

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Authors and Affiliations

  1. Exploration and Development, Research Institute of PetroChina, Changqing Oilfield Company, **’an, 710018, Shanxi, China

    Shou-li Du, **-qun Tan, Chao Li & De-sheng Li

  2. National Engineering Laboratory for Exploration and Development of Low Permeability Oil and Gas Helds, **’an, 710018, Shanxi, China

    **-qun Tan, Chao Li & De-sheng Li

  3. Changqing Oilfield Branch Sixth Oil Production Plant, **’an, 710021, Shanxi, China

    Qiang Ding

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  1. Shou-li Du
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  2. **-qun Tan
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  5. De-sheng Li
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Correspondence to Shou-li Du .

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Editors and Affiliations

  1. College of Petroleum Engineering, **'an Shiyou University, **’an, Shaanxi, China

    Jia'en Lin

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Du, Sl., Tan, Xq., Li, C., Ding, Q., Li, Ds. (2024). Research on Bottom Water Coning Law of Jurassic Reservoir–Based on Kv/Kh Value Recognition. In: Lin, J. (eds) Proceedings of the International Field Exploration and Development Conference 2023. IFEDC 2023. Springer Series in Geomechanics and Geoengineering. Springer, Singapore. https://doi.org/10.1007/978-981-97-0464-4_7

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  • DOI: https://doi.org/10.1007/978-981-97-0464-4_7

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