砾岩储集层聚合物驱油机理与控制因素实验研究

doi:10.13809/j.cnki.cn32-1825/te.2020.03.017

Abstract

Abstract:

Taking the conglomerate reservoir of the Lower Karamay Formation in Qidong-1 area of Karamay Oilfield as the research object, the relation between physical properties, lithology and pore structure modes and the degree of recovery of polymer flooding is studied by laboratory experiments. And by means of nuclear magnetic resonance（NMR） technology, the experimental method of the study on the kinetics of polymer crude oil utilization is established and the kinetics of micro-porosity in the polymer flooding process of conglomerate reservoirs is analyzed. Through the micro-displacement experiments, the residuals after polymer flooding in conglomerate reservoirs are analyzed. The results show that the polymer flooding mainly displaces the cluster-like residual oil and the island-like residual oil. The polymer-driven residual oil accounts for the largest proportion of the total remaining oil. During the polymer flooding process, due to the complex pore structure of conglomerate and high viscosity of polymer solution, the large oil droplets are sheared into small oil droplets, and partially of which are dragged out of the pores by the polymer solution. The correlation between the degree of enhanced oil recovery by polymer flooding and core porosity and permeability is not obvious, however, it is related to the lithology and pore structure of the reservoir. The order of enhanced oil recovery with different lithologic polymer flooding from coarse to small is: boulder coarse sandstone>glutenite>unequal grain small conglomerate>fine conglomerate. There is a quadratic parabola relation between the degree of polymer recovery and dynamic oil saturation.

Key words: Karamay Oilfield, conglomerate reservoir, polymer flooding, flooding mechanism, oil recovery

CLC Number:

TE341

Zhiyuan WANG,Liehui ZHANG,Long TAN, et al. Study on mechanism and controlling factors of polymer flooding in conglomerate reservoir[J]. Reservoir Evaluation and Development, 2020, 10(3): 109-114.

Figures/Tables 8

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References 17

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编号	长度/cm	直径/ cm	原始含水饱和度/%	孔隙度/%	渗透率/10^-3μm²	岩性
1	5.686	3.785	31.34	19.09	2 333	细粒小砾岩
2	5.144	3.816	31.23	13.92	2 047	细粒小砾岩
3	5.416	3.842	36.25	15.39	1 803	细粒小砾岩
4	5.458	3.864	33.73	15.77	50	细粒小砾岩
5	5.130	3.762	31.92	16.68	995	砂砾岩
6	6.151	3.781	46.01	17.75	577	砂砾岩
7	5.300	3.774	33.58	18.16	1 588	砂砾岩
8	5.196	3.756	36.15	16.15	17	砂砾岩
9	6.972	3.780	25.75	19.04	1 588	砂砾岩
10	8.106	3.772	42.92	17.43	2 570	砂砾岩
11	3.990	3.778	41.55	15.58	1 011	含砾粗砂岩
12	7.182	3.784	27.24	17.95	671	含砾粗砂岩
13	7.238	3.788	30.45	20.12	362	含砾粗砂岩
14	5.116	3.842	40.16	19.36	2 031	含砾粗砂岩
15	4.764	3.808	36.55	15.55	1 507	含砾粗砂岩
16	5.674	3.780	33.16	15.96	48	含砾粗砂岩
17	5.630	3.772	29.63	16.22	14	含砾粗砂岩
18	6.030	3.808	42.76	21.04	1 552	含砾粗砂岩
19	6.720	3.804	29.74	16.52	30	含砾粗砂岩
20	6.380	3.810	35.01	19.28	29.2	含砾粗砂岩
21	6.960	3.774	40.87	16.63	1 743	不等粒小砾岩
22	6.640	3.756	33.62	15.82	135	不等粒小砾岩
23	5.290	3.780	45.42	17.64	1 876	砂质砾岩
24	5.200	3.816	35.22	16.11	101	砾质砂岩
25	6.460	3.806	33.25	13.81	145.05	泥质砂岩

Study on mechanism and controlling factors of polymer flooding in conglomerate reservoir

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