Investigation into the Classification of Tight Sandstone Reservoirs via Imbibition Characteristics

Ming Li, Hai’en Yang, Hongjun Lu, Tianjiang Wu, Desheng Zhou and Yafei Liu
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Ming Li: State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, Sichuan, China
Hai’en Yang: Oil & Gas Technology Research Institute of Changqing Oilfield Company, PetroChina, Xi’an 710018, Shaanxi, China
Hongjun Lu: Oil & Gas Technology Research Institute of Changqing Oilfield Company, PetroChina, Xi’an 710018, Shaanxi, China
Tianjiang Wu: Oil & Gas Technology Research Institute of Changqing Oilfield Company, PetroChina, Xi’an 710018, Shaanxi, China
Desheng Zhou: College of Petroleum Engineering, Xi’an Shiyou University, Xi’an 710065, Shaanxi, China
Yafei Liu: College of Petroleum Engineering, Xi’an Shiyou University, Xi’an 710065, Shaanxi, China

Energies, 2018, vol. 11, issue 10, 1-13

Abstract: Tight sandstone reservoirs are often produced by shutting in the well and inducing imbibition. However, by adopting current reservoir classifications, the heterogeneity of reservoirs cannot be properly treated. Based upon the analysis of the imbibition curves and mercury intrusion porosimetry tests, Chang-7 tight sandstone reservoirs were classified into three categories according to the newly proposed standards. Imbibition tests demonstrated that for the first category, imbibition and drainage occurred continuously and never reached the plateau within the experiment duration. It was suggested that a longer shut-in time favors the production of oil. For the second category, a steady state for imbibition was reached and a shut-in time as short as three days resulted in a high imbibition rate. For the third category, a plateau was reached for the first time and imbibition restarted until a steady state was reached. The average shut-in time for the third category was eight days. Compatibility between reservoir characteristics and a soaking development regime based upon the proposed classification methods effectively enhances the oil recovery efficiency of formations with distinct petrophysical properties. This provides insight into the classification methods of tight sandstone reservoirs.

Keywords: tight sandstone; reservoir classification; spontaneous imbibition curve; shut-in time (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: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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