超临界CO2萃取致密砂砾岩中原油效果影响因素实验研究

doi:10.13809/j.cnki.cn32-1825/te.2021.06.007

Abstract

Abstract:

In order to improve the oil recovery of tight sandy conglomerate reservoir, the tight oil in the tight glutenite core is extracted by the supercritical CO₂ based on the reservoir conditions of Mahu tight sandy conglomerate reservoir in Xinjiang. And then, four production parameters affecting tight oil extraction, which are the pressure（7~25 MPa）, the temperature（30~60 ℃）, the soaking time（30~180 min） and the cycle time（30~180 min）, have been optimized and analyzed by the single factor analysis method. The results show that the supercritical CO₂ can extract the crude oil from the tight glutenite with relatively good effects, and the extraction rate can reach up to 25.22 %. By the orthogonal design experiment L₉（3⁴） with four factors and three levels for the above four production parameters, it is found that the factors influencing the extraction effect of crude oil by supercritical CO₂ have primary and secondary order: pressure > immersion time > temperature > circulating time. The optimal parameter scheme is the pressure of 25 MPa, tht temperature of 50 ℃, the soaking time of 120 min, and the cyclic time of 150 min. The application of CO₂ to extract crude oil in tight glutenite reservoirs has good application prospects.

Key words: supercritical CO₂, extraction, tight sandy conglomerate reservoir, extraction rate, influence factor

CLC Number:

TE357

HU Haisheng,GAO Yang,SHAN Jiangtao,LEI Xianmei,ZHANG Yulong,ZHANG Guangchao,YE Zhongbin. Experimental researches on factors influencing supercritical CO₂ extraction effect of crude oil from tight sandy conglomerate[J].Petroleum Reservoir Evaluation and Development, 2021, 11(6): 845-851.

Figures/Tables 22

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References 23

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岩心编号	长度（cm）	直径（cm）	渗透率（10^-3μm²）	孔隙度（%）	M （g）
LY-19-1	7.842	2.531	0.076	6.18	87.609
LY-19-2	7.937	2.536	0.054	5.87	88.128
LY-19-3	7.867	2.523	0.063	6.12	87.411
LY-19-4	7.905	2.518	0.058	5.96	87.799
LY-19-5	7.896	2.520	0.060	5.98	87.687
LY-19-6	7.872	2.508	0.061	6.02	86.846

岩心编号	M₁（g）	M₂（g）	压力（MPa）	萃取率（%）
LY-19-1	88.872	88.841	7	2.45
LY-19-2	89.329	89.187	8	11.82
LY-19-3	88.667	88.446	10	17.60
LY-19-4	89.004	88.734	15	22.41
LY-19-5	88.933	88.644	20	23.19
LY-19-6	88.021	87.746	25	23.40

岩心编号	长度（cm）	直径（cm）	渗透率（10^-3μm²）	孔隙度（%）	M（g）
LY-19-7	7.904	2.514	0.072	6.12	87.632
LY-19-8	7.927	2.509	0.064	5.96	88.017
LY-19-9	7.858	2.516	0.057	5.71	88.236
LY-19-10	7.898	2.521	0.061	5.76	87.374
LY-19-11	7.919	2.519	0.058	5.66	86.925
LY-19-12	7.814	2.525	0.072	6.14	87.251
LY-19-13	7.848	2.505	0.068	5.98	88.226

岩心编号	M₁（g）	M₂（g）	温度（℃）	萃取率（%）
LY-19-7	88.887	88.880	30	0.56
LY-19-8	89.233	88.957	35	22.70
LY-19-9	89.389	89.119	40	23.44
LY-19-10	88.557	88.277	45	23.68
LY-19-11	88.119	87.910	50	17.50
LY-19-12	88.588	88.367	55	16.53
LY-19-13	89.486	89.283	60	16.11

岩心编号	长度（cm）	直径（cm）	渗透率（10^-3μm²）	孔隙度（%）	M（g）
LY-19-14	7.897	2.524	0.056	5.67	88.713
LY-19-15	7.905	2.509	0.071	6.06	89.039
LY-19-16	7.866	2.517	0.068	5.94	88.618
LY-19-17	7.881	2.491	0.055	5.66	87.695
LY-19-18	7.914	2.505	0.051	5.48	86.599
LY-19-19	7.835	2.510	0.062	5.78	86.893

Experimental researches on factors influencing supercritical CO₂ extraction effect of crude oil from tight sandy conglomerate

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岩心编号	M₁（g）	M₂（g）	浸泡时间（min）	萃取率（%）
LY-19-14	89.903	89.783	30	10.08
LY-19-15	90.260	89.982	60	22.77
LY-19-16	89.833	89.551	90	23.21
LY-19-17	88.870	88.580	120	24.68
LY-19-18	87.687	87.417	150	24.82
LY-19-19	88.040	87.752	180	25.11

岩心编号	长度（cm）	直径（cm）	渗透率（10^-3μm²）	孔隙度（%）	M（g）
LY-19-20	7.871	2.534	0.055	5.62	87.512
LY-19-21	7.898	2.518	0.064	5.89	89.230
LY-19-22	7.903	2.526	0.077	6.22	88.701
LY-19-23	7.865	2.509	0.082	6.86	87.563
LY-19-24	7.927	2.513	0.066	5.94	86.436
LY-19-25	7.858	2.494	0.072	6.14	87.362

岩心编号	M₁（g）	M₂（g）	循环时间（min）	萃取率（%）
LY-19-20	88.741	88.527	30	17.41
LY-19-21	90.489	90.198	60	23.11
LY-19-22	89.994	89.682	90	24.13
LY-19-23	88.980	88.629	120	24.77
LY-19-24	87.634	87.333	150	25.13
LY-19-25	88.611	88.296	180	25.22

岩心编号	长度（cm）	直径（cm）	渗透率（10^-3μm²）	孔隙度（%）
LY-19-26	7.900	2.544	0.058	5.96
LY-19-27	7.932	2.504	0.072	6.82
LY-19-28	7.890	2.488	0.083	7.11
LY-19-29	7.892	2.510	0.064	6.86
LY-19-30	7.848	2.496	0.068	6.42
LY-19-31	7.828	2.516	0.076	6.94
LY-19-32	7.786	2.532	0.064	6.12
LY-19-33	7.813	2.512	0.057	5.88
LY-19-34	7.806	2.530	0.066	6.33

岩心编号	M（g）	M₁（g）	M₂（g）	萃取率（%）
LY-19-26	88.214	89.520	89.270	19.14
LY-19-27	89.023	90.483	90.173	21.23
LY-19-28	88.861	90.303	89.981	22.33
LY-19-29	87.960	89.389	89.059	23.09
LY-19-30	86.859	88.140	87.819	25.06
LY-19-31	87.128	88.539	88.208	23.46
LY-19-32	88.362	89.643	89.319	25.29
LY-19-33	88.882	90.113	89.804	25.10
LY-19-34	87.772	89.092	88.765	24.77

方案	因素				萃取率（%）
方案	压力（MPa）	温度（℃）	浸泡时间（min）	循环时间（min）	萃取率（%）
1	15	40	60	90	19.14
2	15	50	90	120	21.23
3	15	60	120	150	22.33
4	20	40	90	150	23.09
5	20	50	120	90	25.06
6	20	60	60	120	23.46
7	25	40	120	120	25.29
8	25	50	60	150	25.10
9	25	60	90	90	24.77

实验指标		因素
实验指标		压力（MPa）	温度（℃）	浸泡时间（min）	循环时间（min）
指标和	T₁	62.680	67.540	67.660	68.970
	T₂	71.601	71.349	69.141	69.951
	T₃	75.150	70.539	72.630	70.509
指标均值	t₁	20.893	22.513	22.553	22.990
	t₂	23.867	23.783	23.047	23.317
	t₃	25.050	23.513	24.210	23.503
极差	R	4.157	1.270	1.657	0.513

因素	偏差平方和	自由度	F比值	F临界值
压力	27.519	2	1.000	9.000
温度	2.686	2	0.098	9.000
浸泡时间	4.341	2	0.158	9.000
循环时间	0.405	2	0.015	9.000
误差	27.52	2

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Experimental researches on factors influencing supercritical CO2 extraction effect of crude oil from tight sandy conglomerate

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Experimental researches on factors influencing supercritical CO₂ extraction effect of crude oil from tight sandy conglomerate