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

摘要/Abstract

摘要：

水平井压裂后注CO₂吞吐技术能有效改善原油性质,提高超低渗油藏采收率。结合典型超低渗透储层油藏H区地质及流体特征,采用室内实验和数值模拟相结合的手段,开展超低渗油藏水平井注CO₂多周期吞吐机理及原油性质变化规律的研究。结果表明：注入CO₂使得原油饱和压力升高、体积膨胀、黏度降低、体系变轻质;注CO₂吞吐不同阶段的主要作用机理不同,注入阶段补充地层能量、溶于原油、降低原油黏度,焖井及开井生产初期降低原油黏度,扩大CO₂波及范围,开井生产中后期萃取轻质烃和少量中间组分烃;采用定时定点的方式,分析油藏中不同距离的油相中CO₂含量,推测出H区块注入CO₂沿裂缝的横向波及半径介于24~40 m,随着吞吐周期的增多,油相中CO₂摩尔含量的增幅由第一周期的增加451倍,降到第三吞吐周期的0.44倍,注入的CO₂溶于原油的量相对减小,对原油性质的影响逐渐减小。该研究对CO₂吞吐机理的认识提供了新的分析方式,为进一步推广超低渗油藏水平井CO₂多周期吞吐技术提供一定的理论支撑。

关键词: 超低渗油藏, CO₂多周期吞吐, 原油性质, 组分变化, 数值模拟

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

中图分类号:

TE341

廖松林,夏阳,崔轶男,刘方志,曹胜江,汤勇. 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[J]. 油气藏评价与开发, 2022, 12(5): 784-793.

LIAO Songlin,XIA Yang,CUI Yinan,LIU Fangzhi,CAO Shengjiang,TANG Yong. 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.

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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

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

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

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