Study on the Imbibition Characteristics of Different Types of Pore-Throat Based on Nuclear Magnetic Resonance Technology

Author:

Liu Xiong1ORCID,Zhang Yang1ORCID,Zhang Ziming2ORCID,Xu Jinze13ORCID,Zhou Desheng1ORCID,Su Jian2ORCID,Tang Ying1ORCID

Affiliation:

1. School of Petroleum Engineering, Xi’an Shiyou University, Xi’an, China

2. Drilling & Production Technology Research Institute, PetroChina Liaohe Oilfield Company, Panjin, China

3. Department of Chemical and Petroleum Engineering, University of Calgary, Calgary, Canada

Abstract

“Fracturing network+imbibition oil production” is a new attempt to effectively develop low-permeability tight reservoirs. Fracturing fluid is not only a carrier for sand carrying but also a tool in the process of imbibition. On the basis of imbibition experiments, combined with nuclear magnetic resonance and pseudo-color processing technology, this paper clarified the dominant forces of different types of pore-throat and quantitatively characterized the contribution of different levels of pore-throat to imbibition oil recovery. The results show that gravity is the main controlling force of imbibition for reservoirs with higher permeability. Fluid replacement mainly occurs in the early period of imbibition. Macropores contribute most of the imbibition recovery, mesopores have a weak contribution, and the contribution of micropores and pinholes can be ignored. For the reservoirs with low permeability, capillary force is the main controlling force of imbibition. Fluid replacement mainly occurs in the later period of imbibition. Macropores contribute most of the imbibition recovery rate, mesopores contribute a small part of the imbibition recovery factor, and the contribution of micropores and pinholes can be ignored. This paper clarified that macropores and mesopores are the main sources of the contribution of imbibition recovery efficiency, and oil content and connectivity are key factors for the imbibition recovery efficiency.

Funder

Innovation and Practice Training Program for Graduate Students

Publisher

Hindawi Limited

Subject

General Earth and Planetary Sciences

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