中国石油大学学报（自然科学版）
中國石油大學學報（自然科學版）
중국석유대학학보（자연과학판）
JOURNAL OF CHINA UNIVERSITY OF PETROLEUM(EDITION OF NATURAL SCIENCE)
2015年
3期
138-142
,共5页
温度应力%孔隙介质%渗透率%初始地应力%热流固耦合
溫度應力%孔隙介質%滲透率%初始地應力%熱流固耦閤
온도응력%공극개질%삼투솔%초시지응력%열류고우합
temperature stress%porous media%permeability%initial geostress%thermo-fluid-solid coupling
为研究不同地应力作用下的油气储层热采过程中渗透率的变化规律，利用自主研制的热流固三场耦合渗流试验系统，选用难被孔隙介质吸附的氦气作为渗流气体，并考虑氦气黏度随温度和压强的变化，消除孔隙介质对渗流气体的吸附和气体黏度变化对渗透试验的影响，开展不同初始应力条件下煤岩试件升温渗透试验。结果表明：孔隙介质渗透率随温度升高先增大后减小，呈非单调非线性变化规律，并存在与初始有效应力有关的拐点温度，这是由于在拐点温度之前，温度应力小于初始有效应力，固体骨架向外膨胀，孔隙空间增大，渗透率增大，超过拐点温度后，温度应力大于初始有效应力，固体骨架向孔隙内膨胀挤占孔隙空间，渗透率降低；渗透率变化拐点温度随初始体积应力的增大而减小，温度应力升高速率随初始体积应力增加而增大。
為研究不同地應力作用下的油氣儲層熱採過程中滲透率的變化規律，利用自主研製的熱流固三場耦閤滲流試驗繫統，選用難被孔隙介質吸附的氦氣作為滲流氣體，併攷慮氦氣黏度隨溫度和壓彊的變化，消除孔隙介質對滲流氣體的吸附和氣體黏度變化對滲透試驗的影響，開展不同初始應力條件下煤巖試件升溫滲透試驗。結果錶明：孔隙介質滲透率隨溫度升高先增大後減小，呈非單調非線性變化規律，併存在與初始有效應力有關的枴點溫度，這是由于在枴點溫度之前，溫度應力小于初始有效應力，固體骨架嚮外膨脹，孔隙空間增大，滲透率增大，超過枴點溫度後，溫度應力大于初始有效應力，固體骨架嚮孔隙內膨脹擠佔孔隙空間，滲透率降低；滲透率變化枴點溫度隨初始體積應力的增大而減小，溫度應力升高速率隨初始體積應力增加而增大。
위연구불동지응력작용하적유기저층열채과정중삼투솔적변화규률，이용자주연제적열류고삼장우합삼류시험계통，선용난피공극개질흡부적양기작위삼류기체，병고필양기점도수온도화압강적변화，소제공극개질대삼류기체적흡부화기체점도변화대삼투시험적영향，개전불동초시응력조건하매암시건승온삼투시험。결과표명：공극개질삼투솔수온도승고선증대후감소，정비단조비선성변화규률，병존재여초시유효응력유관적괴점온도，저시유우재괴점온도지전，온도응력소우초시유효응력，고체골가향외팽창，공극공간증대，삼투솔증대，초과괴점온도후，온도응력대우초시유효응력，고체골가향공극내팽창제점공극공간，삼투솔강저；삼투솔변화괴점온도수초시체적응력적증대이감소，온도응력승고속솔수초시체적응력증가이증대。
To reveal the rule of permeability variation during thermal recovery of oil and gas reservoirs under different ground stresses, a thermo-hydro-mechanical coupled experimental system was developed, and non-adsorbed helium was used in the experiments. The change of helium gas viscosity with temperature and pressure was considered to eliminate the influences on the infiltration experiments. A series of infiltration experiments were conducted for coal and sandstone under different temper-ature conditions and different initial stresses. The results indicate that with the increase of temperature, the permeability of porous medium increases firstly, and then decreases in the form of nonlinearity and non-monotone. There is a temperature of inflection point related with the initial effective stress. The mechanism is described as the following:when temperature is low-er than the temperature of inflection point, temperature stress is less than the initial effective stress, pore space increases be-cause of the outward expansion of solid skeleton, so the permeability will increase. When temperature is higher than the tem-perature of inflection point, temperature stress is bigger than the initial effective stress, pore space decreases because of the inward expansion of solid skeleton. In addition, the temperature of permeability variation inflection point decreases with the increase of initial volume stress, the increasing rate of temperature stress is higher when the size of the initial volume stress is bigger.
