西南石油大学学报（自然科学版）
西南石油大學學報（自然科學版）
서남석유대학학보（자연과학판）
JOURNAL OF SOUTHWEST PETROLEUM UNIVERSITY(SEIENCE & TECHNOLOGY EDITION)
2015年
3期
38-44
,共7页
页岩气藏%扩散%渗流%水平井产能%克努森系数
頁巖氣藏%擴散%滲流%水平井產能%剋努森繫數
혈암기장%확산%삼류%수평정산능%극노삼계수
shale gas reservoir%diffusion%porous flow%horizontal well production capacity%Knudsen coefficient
针对页岩储层纳米孔隙中天然气扩散作用对压裂水平井产能有多大影响这一问题，开展了渗流数学模型建立、求解及定量计算分析研究，研究中采用了三线性渗流机理、克努森扩散机理及扩散引起渗透率增加值公式，绘制了不同孔隙直径下克努森数与储层压力关系图版，得到了可用于实际生产预测的单井产能方程，从孔隙大小、储层压力、气藏深度等3个方面进行了扩散作用的分析，给出了页岩气藏生产过程中需要考虑扩散作用的各指标阈值。结果表明，在储层压力条件下，孔隙越小的储层，扩散作用对产能的影响越大，而对于较大孔隙的储层，当井底压力低于模型中计算出的阈值时，扩散作用就不应该被忽略。
針對頁巖儲層納米孔隙中天然氣擴散作用對壓裂水平井產能有多大影響這一問題，開展瞭滲流數學模型建立、求解及定量計算分析研究，研究中採用瞭三線性滲流機理、剋努森擴散機理及擴散引起滲透率增加值公式，繪製瞭不同孔隙直徑下剋努森數與儲層壓力關繫圖版，得到瞭可用于實際生產預測的單井產能方程，從孔隙大小、儲層壓力、氣藏深度等3箇方麵進行瞭擴散作用的分析，給齣瞭頁巖氣藏生產過程中需要攷慮擴散作用的各指標閾值。結果錶明，在儲層壓力條件下，孔隙越小的儲層，擴散作用對產能的影響越大，而對于較大孔隙的儲層，噹井底壓力低于模型中計算齣的閾值時，擴散作用就不應該被忽略。
침대혈암저층납미공극중천연기확산작용대압렬수평정산능유다대영향저일문제，개전료삼류수학모형건립、구해급정량계산분석연구，연구중채용료삼선성삼류궤리、극노삼확산궤리급확산인기삼투솔증가치공식，회제료불동공극직경하극노삼수여저층압력관계도판，득도료가용우실제생산예측적단정산능방정，종공극대소、저층압력、기장심도등3개방면진행료확산작용적분석，급출료혈암기장생산과정중수요고필확산작용적각지표역치。결과표명，재저층압력조건하，공극월소적저층，확산작용대산능적영향월대，이대우교대공극적저층，당정저압력저우모형중계산출적역치시，확산작용취불응해피홀략。
To determine the effect of gas diffusion affection in the shale gas reservoirs with the desorption-adsorption and nano-scale pore on fractured horizontal well productivity analysis,we established the seepage mathematic model and analyzed quantitatively the production. In the study,we used the three linear seepage mechanism,Knudsen diffusion mechanism and diffusion of the added value of permeability formula to draw the relation chart of Knudsen number under different pore diam-eters with reservoir pressure,and derived the single well productivity equation to be used for the actual production prediction. Analysis of the diffusion of shale gas reservoir was carried out in 3 aspects,which are the pore size,reservoir pressure and gas reservoir depth,and reference is given to consider the diffusion of various indicators. Results show that under the condition of the reservoir pressure,the smaller the porosity of the reservoir,the greater the influence of diffusion effect is on capacity;and for large pore reservoir,when the bottom hole pressure is lower than the threshold of the calculated in the model,the diffusion effect should not be ignored.
