低渗透油藏驱油用缔合聚合物的合成及其油藏适应性研究

doi:10.13809/j.cnki.cn32-1825/te.2020.06.004

Abstract

Abstract:

In view of the reservoir conditions in a block of Changqing Oilfield with medium temperature, high salinity and low permeability, different temperature-salt resistant associative polymers（HAWSP series） with low relative molecular weight（720.42×10⁴ ~ 982.55×10⁴） and different contents of dodecylallyl tetramethyl ethylene diammonium bromide（TDAD） have been designed and synthesized. Then the molecular structure of the polymer has been confirmed by infrared spectroscopy. Under the conditions of this block, the reservoir adaptability of HAWSP series involving solution properties and application performance have been studied, and the field test has been carried out in this block. The results show that, compared with the salt-resistant partially hydrolyzed polyacrylamide（HPAM）, HAWSP series has better thickening capacity and similar aging stability（viscosity retention rate is greater than 85 % after aging for 60 days）. When the gas permeability is of 50×10^-3 μm², the associative polymer HAWSP-850 not only exhibits good injectability and conductivity, but also could present stronger sweeping ability in heterogeneous core with a permeability contrast of 4 times（low permeability is of 25×10^-3 μm²）, which can enhance the oil recovery by another 3.29 percentage points. Field tests show that the temperature-salt resistant associative polymer has better field adaptability. Compared with the conventional HPAM flooding system, it has a significant effect of reducing pressure and improving injection capacity and oil recovery. Associative polymer has important promotion significance of chemical flooding in low permeability reservoirs.

Key words: low permeability, low molecular weight, associative polymer, reservoir adaptability, field test

CLC Number:

TE357

Huabing LI,Jianting LI,Wenhong LI, et al. Synthesis of associative polymer for flooding in low permeability reservoir and its reservoir adaptability[J]. Reservoir Evaluation and Development, 2020, 10(6): 24-32.

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References 21

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聚合物	疏水单体质量分数/%	相对分子质量/10⁴	水解度/ %	FR_{3 μm}
HAWSP-950	0.6	982.55	23.48	1.08
HAWSP-850	0.9	852.65	23.52	1.05
HAWSP-750	1.2	720.42	23.76	1.03
HPAM-1500	0	1 485.34	24.85	1.03

聚合物	气测渗透率/10^-3 μm²	水测渗透率/10^-3 μm²	孔隙度/ %	初始黏度/ （mPa·s）	黏度保留率/ %	压力平稳时注聚量（PV）	阻力系数	残余阻力系数
HAWSP-950	50	10.9	11.3	37.3	60.2	10.6	84.0	34.0
HAWSP-850	50	11.3	11.9	33.4	84.2	4.8	41.8	12.8
HAWSP-750	50	11.8	12.5	31.3	88.5	2.6	17.9	1.4
HPAM-1500	50	10.2	12.1	29.3	73.9	4.2	30.3	4.3

聚合物	黏度/（mPa·s）	孔隙度/ %	含油饱和度/ %	水测渗透率/10^-3 μm²	前水驱采收率/ %	采收率提高百分点
HAWSP-850	33.4	15.8	64.3	13.2	27.4	13.59
HPAM-1500	29.3	16.3	65.1	13.9	26.9	10.30

序号	井号	注缔合聚合物前			注缔合聚合物后			变化
序号	井号	时间	油压/MPa	日注水量/m³	时间	油压/MPa	日注水量/ m³	油压/MPa	日注水量/ m³
1	M-H4-1	201906	18.2	25.7	202004	18.0	26	-0.2	0.3
2	M-H4-2	201906	18.4	21.4	202004	18.5	31	0.1	9.6
3	M-H4-3	201906	18.8	18.3	202004	18.2	25	-0.6	6.7
4	M-H6-1	201906	17.0	23.2	202004	15.6	30	-1.4	6.8
5	M-H6-2	201906	16.4	29.3	202004	16.5	32	0.1	2.7
6	M-H6-3	201906	17.8	21.8	202004	16.6	25	-1.2	3.2
7	M-H8-2	201906	19.8	26.5	202004	18.6	25	-1.2	-1.5
8	MJ-15-10	201906	19.1	20.3	202004	17.4	22	-1.7	1.7

井号	注缔合聚合物前			注缔合聚合物后			2019年6月增油量/t	2020年4月增油量/t
井号	产液量/（m³·d^-1）	产油量/（t·d^-1）	含水率/%	产液量/（m³·d^-1）	产油量/（t·d^-1）	含水率/%	2019年6月增油量/t	2020年4月增油量/t
M-H5-1	4.73	0.43	89.2	26.77	1.40	93.8	242.0	546.3
M-H5-2	16.45	0.63	95.5	24.43	1.32	93.7	119.0	289.8
MJ-H5-3	18.91	0.38	97.6	16.40	1.10	93.5	57.2	128.5
M-H9-3	16.30	0.61	95.6	28.93	1.50	93.9	226.0	312.1
MJ-13-8	10.86	1.16	87.5	14.16	2.77	77.0	437.0	807.1
M-H3-4	15.06	0.26	97.9	17.95	1.08	92.9	281.9	489.1
MJ-103	16.43	0.53	96.2	16.70	1.00	94.1	43.6	101.9
合计							1 406.6	2 674.9

Synthesis of associative polymer for flooding in low permeability reservoir and its reservoir adaptability

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