西南石油大学学报(自然科学版) ›› 2008, Vol. 30 ›› Issue (3): 167-170.DOI: 10.3863/j.issn.1000-2634.2008.03.043

• 探讨与争鸣 • Previous Articles    

THERE IS NOT A STARTING PRESSURE GRADIENT IN LOWPERMEABILITY RESERVOIRS AT ALL

LI Chuanliang1，YANG Yongquan2   

  1. 1.The State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation ·Southwest Petroleum University,Chengdu Sichuan 610500,China;2.PetroChina Tarim Oilfield Company,Korla,Xingjiang 841000,China
  • Received:2008-01-20 Revised:1900-01-01 Online:2008-06-20 Published:2008-06-20

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Abstract: There are many misunderstandings of lowpermeability reservoirs,one of which is the starting pressure gradient for fluids to flow through.Pores are underdeveloped in lowpermeability reservoirs,so permeability and productivity of lowpermeability reservoirs are quite low,and pressure transits at quite low speed.While a pressure gradient is established in lowpermeability reservoirs,the response of production needs a long time period.The weak flow rate from experiment in laboratory is misunderstood as zero,which results in the socalled"starting pressure gradient"phenomenon.The measured starting pressure gradients are usually too high to instruct the oil/gas production of lowpermeability reservoirs.There are not starting pressure gradients for midand highpermeability reservoirs,so not for lowpermeability reservoirs.There are not yielding shearing stresses for solids and liquids,so not for oil and gas.

Key words: reservoir, rock, lowpermeability, pressure gradient, starting pressure gradient

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