Study of the Influence of Dynamic and Static Capillary Forces on Production in Low-Permeability Reservoirs

Yuanzhang Zhang, Youqi Wang, Jianwen Gao, Yuehua Cui and Shuoliang Wang ()
Additional contact information
Yuanzhang Zhang: State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, China Petroleum and Chemical Corporation, Beijing 100083, China
Youqi Wang: State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, China Petroleum and Chemical Corporation, Beijing 100083, China
Jianwen Gao: Exploration and Development Research Institute of PetroChina Changqing Oilfield Company, Xi’an 710018, China
Yuehua Cui: Exploration and Development Research Institute of PetroChina Changqing Oilfield Company, Xi’an 710018, China
Shuoliang Wang: School of Energy Resources, China University of Geosciences (Beijing), Beijing 100083, China

Energies, 2023, vol. 16, issue 3, 1-14

Abstract: Low-permeability reservoirs have strong heterogeneity, and the production prediction based on traditional seepage model is not accurate enough. The dynamic capillary-force seepage model can characterize the dynamic heterogeneity of seepage and more accurately describe the oil–water flow process. In this paper, the calculation formula of the dynamic capillary force is obtained through a real low-permeability core experiment, and the seepage model of dynamic capillary force is established. Based on the model, the authors quantitatively study the effects of formation pressure, heterogeneity and production speed on dynamic capillary force through numerical solutions. It is found that compared with the traditional static capillary-force seepage model, the dynamic capillary-force seepage model makes the predicted water cut increase and the recovery factor decrease. With the increase in development time, formation pressure and production rate will make the effect of dynamic capillary force more obvious. According to the comparison of heterogeneous reservoir models, results show that the horizontal heterogeneity will strengthen the dynamic capillary-force effect, while the vertical heterogeneity will weaken the dynamic capillary-force effect. In the range of research parameters, the recovery ratio predicted by the dynamic capillary-force seepage model can be reduced by 4.7%. A new oil–water seepage model is proposed, which can characterize the spatial difference and dynamic change of low-permeability reservoirs with time. It is of great significance for describing the remaining oil distribution of low-permeability reservoirs in detail and making decisions on efficient EOR measures.

Keywords: dynamic capillary force; low-permeability reservoir; production rate; heterogeneity; oil recovery (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
References: View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/1996-1073/16/3/1554/pdf (application/pdf)
https://www.mdpi.com/1996-1073/16/3/1554/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:16:y:2023:i:3:p:1554-:d:1057566

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().