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| EXPERIMENTAL INVESTIGATION ON THRESHOLD PRESSURE GRADIENT IN SATURATED/UNSATURATED FLOWS IN ULTRA-LOW PERMEABILITY RESERVOIRS |
| XIE Quan1，2，HE Shunli2，JIAO Chunyan2，ZHU Huayin3，FU Chunyan4，LEI Gang2 |
(1. Research Institute of Petroleum Exploration and Development，PetroChina，Beijing 100083，China；2. Key Laboratory of Ministry of Education for Petroleum Engineering，China University of Petroleum，Beijing 102249，China；3. Key Laboratory of Gas Reservoir Formation and Development of China National Petroleum Corporation，Langfang，Hebei 065007，China；4. Institute of
Exploration and Exploitation of Dagang Oil Field，Tianjin 300280，China) |
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Abstract According to the investigation argument between Chinese researchers and oversea scholars on threshold pressure gradient characteristics in ultra-low permeability reservoirs，with full diameter from Triassic outcrop by means of fully-automatic flooding system of AFS300TM provided by Core Lab in USA，an unsteady approach to test the threshold pressure gradient of saturated and unsaturated flow in the ultra-low permeability cores is proposed. The threshold pressure gradient in the saturated and unsaturated flows are analyzed with the investigation on the pressure variation from downstream and upstream of the rock cores. The experimental results indicate that the threshold pressure gradient doesn′t exist in the ultra-low permeability rocks with saturated flow of normal brine and kerosene. And the capillary force caused in the interfaces of the fluids in the unsaturated flow is the basic reason of obvious threshold pressure gradient. Moreover，the dynamic effect of capillary pressure is observed in the unsteady state flow experiments from ultra-low permeability rocks.
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Received: 10 June 2010
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2011, Vol. 30 
