致密砾岩油藏CO2吞吐提高采收率可行性研究

doi:10.13809/j.cnki.cn32-1825/te.2021.06.005

Abstract

Abstract:

Based on the interactions between CO₂ and crude oil, CO₂ and conglomerate, the enhanced oil recovery（EOR） mechanism of CO₂ huff-n-puff has been revealed in Huanmahu tight conglomerate reservoir. Meanwhile, a high temperature and high pressure nuclear magnetic system was applied to monitor the change of oil saturation during experimental processes at pore scale in cores of substrates. Core fracturing and displacement system were used to investigate the effects of fractures on EOR during CO₂ huff-n-puff. The experimental results indicated that CO₂ could effectively dissolve in crude oil to replenish formation energy, reduce oil viscosity and improve wettability. Moreover, the crude oil produced in depletion development was in large pores, while that in medium pores and small pores could be effectively activated by CO₂ huff-n-puff. After depletion development, three cycles of huff-n-puff could enhance oil recovery by 23.1 %, among which the first cycle contributed most with factor of 15.1 %. The existence of fractures could increase the contact area between crude oil and CO₂ and decrease the flow resistance of crude oil, and finally the EOR is up to 27.1 %. All the results reveal the feasibility of CO₂ huff-n-puff to improve oil recovery in tight conglomerate reservoirs from pore scale.

Key words: enhanced oil recovery（EOR）, CO₂ huff-n-puff, tight conglomerate reservoir, fractures, NMR, three-dimensional physical simulation

CLC Number:

TE38

FAN Xibin,PU Wanfen,SHAN Jiangtao,DU Daijun,QIN Jianhua,GAO Yang. Feasibility of enhanced oil recovery by CO₂ huff-n-puff in tight conglomerate reservoir[J].Petroleum Reservoir Evaluation and Development, 2021, 11(6): 831-836.

Figures/Tables 11

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组分	摩尔含量	组分	摩尔含量
C₁	83.98	C₄	0.42
C₂	5.73	C₅	0.17
C₃	0.88	N₂	8.82

CO₂摩尔含量（%）	GOR （m³/m³）	p_b （MPa）	膨胀系数	黏度（mPa·s）
0	68	15	1.149	0.673
4.55	72.33	15.65	1.166	0.646
10.09	84.31	16.17	1.194	0.617
19.34	109	16.81	1.248	0.539
32.96	146	17.54	1.358	0.426
48.26	210	18.52	1.557	0.324

反应时间（h）	石英（%）	钾长石（%）	斜长石（%）	黏土含量（%）
0	36.0	18.3	22.6	23.1
20	36.9	17.0	21.8	24.3
45	36.2	15.1	21.1	27.6
70	36.3	12.3	19.9	31.5
95	37.2	9.7	19.3	33.8

Feasibility of enhanced oil recovery by CO₂ huff-n-puff in tight conglomerate reservoir

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Feasibility of enhanced oil recovery by CO2 huff-n-puff in tight conglomerate reservoir

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Feasibility of enhanced oil recovery by CO₂ huff-n-puff in tight conglomerate reservoir