超低渗油藏水平井注CO2多周期吞吐原油性质变化规律研究

doi:10.13809/j.cnki.cn32-1825/te.2022.05.010

Abstract

Abstract:

CO₂ huff-n-puff after fracturing of horizontal wells can effectively improve the properties of crude oil and increase the oil recovery of ultra-low permeability reservoirs. Combined with the geology and fluid characteristics of a typical ultra-low permeability reservoir, Block H, the mechanism of multi-cycle CO₂ injection in horizontal wells and the variation of crude oil properties in ultra-low permeability reservoirs are studied by means of laboratory experiment and numerical simulation. The results show that after CO₂ injection, the saturated pressure of crude oil increases, the volume expands, the viscosity decreases, and the system becomes lighter. And the main action mechanism of different stages of CO₂ huff-n-puff are different: in the injection stage, the main mechanism is to supplement the formation energy, dissolve in crude oil, and reduce the crude oil viscosity; in the soaking and the initial stage of production, the main mechanism is to reduce the crude oil viscosity and expand the scope of CO₂; in the middle and late period of well opening production, the light hydrocarbons and a small amount of intermediate component hydrocarbons in the oil phase are extracted. The CO₂ content in oil phases at different distances in the reservoir is analyzed by the method of fixed time and fixed point, and it is deduced that the lateral sweep radius of CO₂ injection along the fracture in H block is 24~40 m. With the increase of the huff-n-puff cycle, the increase of molar content of CO₂ in the oil phase decreased from 451 times in the first cycle to 0.44 times in the third cycle. The dissolved amount of injected CO₂ in crude oil decreases relatively, and the effect on the properties of crude oil also gradually decreases. The above research provides a new analysis method for understanding the mechanism of CO₂ huff-n-puff, and provides some theoretical support for further popularizing the multi-cycle CO₂ huff-n-puff technology of horizontal wells in ultra-low permeability reservoirs.

Key words: ultra-low permeability reservoir, CO₂ multi-cycle huff-n-puff, crude oil properties, component change, numerical simulation

CLC Number:

TE341

Songlin LIAO,Yang XIA,Yinan CUI, et al. Variation of crude oil properties with multi-cycle CO₂ huff-n-puff of horizontal wells in ultra-low permeability reservoir[J]. Petroleum Reservoir Evaluation and Development, 2022, 12(5): 784-793.

Figures/Tables 14

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组分	摩尔组成	组分	摩尔组成	组分	摩尔组成
CO₂	0.05	C₉	2.24	C₂₁	1.37
N₂	1.11		C₁₀	2.93		C₂₂	0.91
C₁	24.53		C₁₁	2.61		C₂₃	0.91
C₂	8.15		C₁₂	1.69		C₂₄	1.01
C₃	11.04		C₁₃	1.01		C₂₅	0.96
iC₄	1.59		C₁₄	5.12		C₂₆	0.82
nC₄	4.06		C₁₅	2.01		C₂₇	0.87
iC₅	2.43		C₁₆	1.78		C₂₈	0.82
nC₅	2.70		C₁₇	1.78		C₂₉	0.87
C₆	1.55		C₁₈	1.05		C₃₀	0.73
C₇	0.80		C₁₉	0.46		C₃₁₊	5.95
C₈	2.73		C₂₀	1.33

注入CO₂比例（%）	饱和压力（MPa）	膨胀系数	黏度（mPa∙s）
0	10.18	1.000	1.41
12.3	11.45	1.033	1.36
25.4	13.21	1.142	1.28
35.6	14.85	1.195	1.17
46.5	16.65	1.311	1.05
60.4	20.21	1.489	0.90
71.2	24.62	1.794	0.72

测试项目	实验值	模拟值	相对误差（%）
单脱气油比（m³/ m³）	85.210	82.410	3.24
地层原油密度（g/cm³)	0.725	0.731	0.79
脱气原油密度（g/cm³)	0.840	0.845	0.68
地层原油黏度（mPa∙s）	1.410	1.407	0.19
泡点压力（MPa）	10.180	10.410	2.30

吞吐周期	生产时间点	距裂缝8 m处油相各组分摩尔含量
吞吐周期	生产时间点	N₂	CO₂	C₁	C₂—C₃	C₄—C₆	C₇—C₁₅	C₁₆—C₃₁₊
第一吞吐周期	开始吞吐时	0.011 1	0.000 5	0.245 4	0.192 0	0.123 3	0.211 5	0.216 3
	注CO₂结束时	0.000 9	0.716 6	0.023 8	0.026 2	0.022 8	0.077 1	0.132 7
	焖井结束时	0.000 9	0.662 3	0.025 7	0.031 7	0.029 7	0.100 6	0.149 1
	生产10 d	0.001 8	0.509 3	0.053 9	0.068 0	0.059 1	0.142 3	0.165 6
	生产1 a	0.007 0	0.226 0	0.170 4	0.148 2	0.098 9	0.172 9	0.176 6
第二吞吐周期	开始吞吐时	0.008 3	0.165 9	0.194 5	0.160 8	0.105 1	0.181 0	0.184 5
	注CO₂结束时	0.000 6	0.712 2	0.015 9	0.018 9	0.018 3	0.080 3	0.153 9
	焖井结束时	0.000 7	0.664 5	0.018 9	0.024 5	0.024 8	0.101 8	0.164 9
	生产10 d	0.001 7	0.520 5	0.049 1	0.061 1	0.054 4	0.141 6	0.1716
	生产1 a	0.005 5	0.287 5	0.141 7	0.134 3	0.093 5	0.167 2	0.1703
第三吞吐周期	开始吞吐时	0.006 6	0.229 5	0.165 0	0.147 8	0.099 8	0.174 3	0.176 9
	注CO₂结束时	0.000 3	0.710 6	0.009 5	0.013 2	0.014 6	0.083 0	0.168 8
	焖井结束时	0.000 4	0.665 9	0.013 3	0.019 0	0.021 1	0.103 6	0.176 7
	生产10 d	0.001 6	0.524 8	0.046 2	0.056 7	0.050 7	0.141 3	0.178 8
	生产1 a	0.004 5	0.329 4	0.122 2	0.124 0	0.089 6	0.163 8	0.166 4

Variation of crude oil properties with multi-cycle CO₂ huff-n-puff of horizontal wells in ultra-low permeability reservoir

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Variation of crude oil properties with multi-cycle CO2 huff-n-puff of horizontal wells in ultra-low permeability reservoir

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Variation of crude oil properties with multi-cycle CO₂ huff-n-puff of horizontal wells in ultra-low permeability reservoir