新疆油田中深层稠油CO2驱/吞吐实验研究

doi:10.13809/j.cnki.cn32-1825/te.2024.01.011

Abstract

Abstract:

Addressing the challenges of moderate to strong velocity sensitivity damage and strong to extremely strong water sensitivity damage in the medium and deep heavy oil reservoirs of Xinjiang oilfields, which lead to suboptimal waterflooding outcomes, a study was conducted leveraging the unique physical and chemical properties of CO₂. Utilizing high-temperature, high-pressure PVT apparatus and long core displacement equipment, the feasibility of enhancing oil recovery through CO₂ flooding/huff and puff was explored by determining the high-pressure physical properties of CO₂-crude oil and analyzing the composition and viscosity changes of the produced oil with gas chromatography and high-temperature, high-pressure rheometry. The experimental results show that 57.345% mole fraction of CO₂ can increase the dissolved gas-oil ratio（GOR） from 32 m³/m³ to 149.3 m³/m³, the bubble point pressure（p_b） from 6.8 MPa to 15.7 MPa, the volume coefficient of crude oil from 1.06 to 1.27, the density of crude oil from 0.896 5 g/cm³ to 0.854 8 g/cm³, and the viscosity of crude oil from 419.3 mPa·s to 253.4 mPa·s. Therefore, CO₂ can effectively supplement the formation energy, increase the elastic energy of crude oil and reduce the seepage resistance. The first round of 0.95 PV（pore volume） CO₂ flooding has a crude oil recovery of 32.8%, and the fluid in the porous medium is redistributed after 24 hours of shut-in. The second round of 0.5 PV CO₂ flooding can increase the crude oil recovery by 17.9%. The crude oil recovery of five rounds of CO₂ huff and puff is 63.5%. The viscosity of the produced oil tends to decrease, mainly due to the deposition of asphaltenes in crude oil in porous media. The experimental results have confirmed the feasibility of CO₂ flooding/huff and puff in the recovery of heavy oil in the middle and deep layers of Xinjiang Oilfield.

Key words: CO₂ flooding, CO₂huff and puff, swelling extraction, enhance oil recovery, heavy oil reservoir

CLC Number:

TE38

SHI Yan, XIE Junhui, GUO Xiaoting, WU Tong, CHEN Dequan, SUN Lin, DU Daijun. Experimental study on CO₂ flooding/huff and puff of medium-deep heavy oil in Xinjiang Oilfield[J].Petroleum Reservoir Evaluation and Development, 2024, 14(1): 76-82.

Figures/Tables 12

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References 27

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压力/ MPa	溶解气油比/（m³/m³）	原油密度/ （g/cm³）	原油体积系数	膨胀系数	黏度计算值/（mPa·s）
*30.61	31.8	0.896 5	1.064	0.939 8	419.33
**6.80	31.8	0.883 7	1.084	0.922 5	351.74

组分	单脱气摩尔分数
组分	CO₂加量摩尔分数 0	CO₂加量摩尔分数 15.595	CO₂加量摩尔分数 35.762	CO₂加量摩尔分数 49.06	CO₂加量摩尔分数 57.345
C₁	98.395	97.42	93.10	85.52	88.13
C₂	0.370	0.69	2.30	6.58	7.09
C₃	0.508	0.72	1.68	2.32	1.43
iC₄	0.161	0.24	0.58	0.89	0.54
nC₄	0.301	0.51	1.21	2.02	1.28
iC₅	0.115	0.16	0.40	0.81	0.42
nC₅	0.117	0.20	0.55	1.18	0.71
C₆	0.034	0.07	0.19	0.67	0.39

组分	单脱气摩尔分数
组分	CO₂加量摩尔分数 0	CO₂加量摩尔分数 15.595	CO₂加量摩尔分数35.762	CO₂加量摩尔分数49.06	CO₂加量摩尔分数57.345
C₁—C₈	42.92	39.540	30.120	26.04	22.650
C₉—C₁₂	14.79	17.210	18.670	21.56	22.860
C₁₃—C₂₀	23.19	23.560	28.250	29.05	31.430
C₂₁—C₃₀	9.64	10.680	12.060	12.24	11.680
C₃₀₊	2.56	2.190	2.770	2.73	2.780

编号	长度/cm	宽度/cm	高度/cm	气测渗透率/10^-3 μm²	孔隙度/%	含油饱和度/%	注入速度/（mL/min）	注气方式
50-3	30.0	4.5	4.5	49.5	17.3	76.3	1	驱替
50-4	30.0	4.5	4.5	48.7	17.2	74.5	1	吞吐

	饱和分+芳香分质量分数	胶质质量分数	沥青质质量分数
样品1	50.07	30.91	19.02
样品2	45.34	41.04	13.62

Experimental study on CO₂ flooding/huff and puff of medium-deep heavy oil in Xinjiang Oilfield

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Experimental study on CO2 flooding/huff and puff of medium-deep heavy oil in Xinjiang Oilfield

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Experimental study on CO₂ flooding/huff and puff of medium-deep heavy oil in Xinjiang Oilfield