Study on Variation Laws of Fluid Threshold Pressure Gradient in Low Permeable Reservoir

Mingwei Zhao, Mengjiao Cao, Haonan He and Caili Dai
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Mingwei Zhao: School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China
Mengjiao Cao: School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China
Haonan He: School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China
Caili Dai: School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China

Energies, 2020, vol. 13, issue 14, 1-18

Abstract: A study on the seepage characteristics and laws of nano-micron pore throat in a low permeable reservoir matrix is of great significance for promoting high efficacy of low permeable reservoirs. Threshold pressure gradient (TPG) is an essential factor to reflect the seepage law. Here, variation laws of TPG and its influencing factors of low reservoir fluid are analyzed systematically through physical simulation experiment. Throat diameter distribution of cores was measured by a mercury injection method, and it was found that with the decrease of pore throat median diameter, TPG increase appeared slowly first and fast afterwards. The patterns of the TPG with permeability in water and oil were compared. Results showed that the TPG versus permeability gave power functions in a form and the TPG in oil was more than two times larger than that of water. Besides, TPG in two-phase flow was investigated by the stabilization method. Tests revealed that the higher the oil saturation, the greater the TPG value, and the TPG in two-phase flow is always higher than that of single-phase flow under the same conditions, which function as the combined action of the capillary force. In addition, the effects of core length, fluid type, and core wettability on the TPG were studied systematically, which has guiding significance for the development of a low permeability reservoir.

Keywords: threshold pressure gradient; single-phase flow; two-phase flow; variation (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: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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