驱油用聚合物在渤海油田中高渗储层的适应性实验研究

doi:10.13809/j.cnki.cn32-1825/te.2020.06.006

Abstract

Abstract:

In order to explore the medium-high permeability reservoir with the permeability of （200~1 000）×10^-3 μm², the rheological behavior, thermal stability, viscoelasticity, and propagation performance of three kinds of polymer（linear polymer, hydrophobic association of partially hydrolyzed polyacrylamide（HAHPAM）, and active polymer） acting as the chemical flooding agents in Bohai Bay, are studied under the simulated reservoir condition. Results of rheological behavior indicate that HAHPAM and active polymer solutions exhibit shear thickening at low shearing rate（simulation of deep reservoir, 5.88~14.42 s^-1）, and all three polymers show shear thinning at high shear rates（simulation of immediate vicinity of wellbore, 149.9~223.4 s^-1）. The oscillation frequency measurements show that HAHPAM and active polymer have larger elasticity, and their storage modulus are greater than their loss modulus. Results of sand-pack flow experiments show that linear polymer and active polymer can propagate better in porous media to achieve in-depth conformance control, whereas HAHPAM shows poor propagation behavior. The results of TEM and LPSA indicate that HAHPAM shows larger aggregation sizes（1.22 μm）, and the compatibility of linear polymer（0.28 μm） and active polymer（0.52 μm） with pore throats（4 μm） of reservoirs is better than that of HAHPAM. The results show that for the target reservoir, the polymer has better adaptability to the reservoir, followed by the linear polymer, while the hydrophobic association polymer has poor adaptability to the reservoir. The selection of polymer for polymer flooding in offshore reservoirs needs to consider the rheological properties of polymer, reservoir adaptability, and molecular microstructures so as to establish a multi-scale evaluation method for polymer screening. This study has a certain significance for screening polymer for polymer flooding in offshore oilfields.

Key words: polymer flooding, linear polymer, active polymer, HAHPAM, rheological properties, propagation properties, plugging effect

CLC Number:

TE357

YU Meng,TIE Leilei,LI Xiang,ZHANG Bo,LIU Wenhui,CHANG Zhen. Experiments on adaptability of polymer flooding for medium-high permeability reservoir in Bohai Oilfield[J].Reservoir Evaluation and Development, 2020, 10(6): 40-45.

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水型	阳离子			阴离子				总矿化度
水型	Ca²⁺	Mg²⁺	Na⁺	CO₃^2-	HCO₃^-	Cl^-	SO₄^2-	总矿化度
模拟水	568.9	228.9	2 551.9	0	190.6	5 470.7	36.6	9 047.6

聚合物类型	η₀	λ	n	R²
聚合物A	66.436 4	-2.928 9	0.698 7	0.973 6
聚合物B	910.052 4	-14.995 7	0.477 1	0.991 3
聚合物C	407.544 3	4.495 9	0.626 4	0.995 9

聚合物类型	分子回旋半径（r_p）/μm	孔喉尺寸（r_h）/μm	r_h/r_p	传导结果
线性聚合物	0.28	4.00	14.29	良好
聚表剂	0.52	4.00	7.69	良好
疏水缔合聚合物	1.22	4.00	3.28	差

Experiments on adaptability of polymer flooding for medium-high permeability reservoir in Bohai Oilfield

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