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火山岩气藏复杂渗流机理研究
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摘要
近年来,在我国的松辽、准噶尔、渤海湾等盆地陆续发现了火山岩气藏,我国火山岩气藏探明储量大。目前,国内外虽然对火山岩气藏进行了一些研究,但这些研究多集中在火山岩的勘探以及地质描述上,而对火山岩气藏渗流机理和规律的研究较少。本文对取自大庆徐深火山岩气藏的真实岩芯进行了渗流实验研究,取得了以下成果和认识:
     (1)通过气体单相渗流实验,总结出了气体在不同的孔隙压力和驱替压差下的渗流规律,得出了滑脱效应对不同渗透率火山岩气藏渗流的影响大小,以及不同渗透率岩芯的惯性流临界压力梯度,并推导出了单相气体在火山岩中的渗流方程,为火山岩气藏的试井解释和产能评价提供了理论依据;
     (2)通过含水岩芯渗流实验,得出了气相渗透率随含水饱和度和驱替压差的变化规律,研究了岩芯绝对渗透率和含水饱和度对启动压力梯度的影响,并在此基础上推导了火山岩含水岩芯的渗流方程;
     (3)通过应力敏感性实验,研究了火山岩气藏应力敏感性的强弱程度及其影响因素,并推导了火山岩气藏考虑应力敏感性的渗流方程。
Resently,volcanic gas reservoirs have been found in Songliao Basin,Zhunger Basin,Bohai Sea Bay,etc.,and the proved resources of volcanic-rock gas reservoirs in our country are huge.Presently,some studies have been done on the volcanic-rock gas reservoir both in our country and abroad,but these studies mainly focus on the exploration and geological description of the volcanic-rock gas reservoirs,while the rules and mechanics of flow in them are rarely studied.This paper conducts experimental study on the samples from Xushen in Daqing feild,and the main fruits of this work are listed as follows:
     (1) Through experiments of single-phase gas flow in volcanic-rock,this paper finds out the rules of seepage flow of gas under different driving pressure and pore pressure,the impact of slippage on the seepage flow of volcanic-rock reservoirs with different permeability,and the critical driving-pressuer gradient for inertial flow,and conducts the filtration equation for single-phase gas flow in volcanic-rock reservoirs;
     (2) Through experiments of flow in partial water-saturated volcanic-rock,this paper studies the changes of gas permeability with water saturation and driving pressure gradient,and the impact of absolut permeability of the volcanic-rock and water saturation on the start-up pressure gradient,and deducts the filtration equation for partial water-saturated volcanic-rock on this basis;
     (3) Through experiments of stress sensitive for volcanic-rock,this paper studies the level of stress sensitive in volcanic-rock reservoirs and its affecting factors,and deducts the filtration equation for stress sensitive volcanic-rock on this basis.
引文
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