调驱剂传输运移能力技术指标评价研究

doi:10.13809/j.cnki.cn32-1825/te.2020.03.015

Abstract

Abstract:

In recent years, the application scale of chemical flooding technology has been increased, but the results of some field tests are not ideal. There are many reasons for this situation, including the adaptability of profile control and displacement agent with reservoir pores. Aiming at the actual demand of field production and theory, the evaluation method and technical index of transport capacity of chemical profile control and flooding agent are studied. The results show that the transport capacity of profile control agent in porous media is a necessary condition for realizing the diversion of deep liquid flow. The transport capacity can be evaluated by the ratio of the pressure difference（β） between the front and the back of core at the end of injection of profile control agent. The recommended technical index ranges are as follows: ① β=1~3, good transport capacity; ② β =4~8, medium; ③ β=9~15, poor; ④ β>16, poor. The retention and transport ability of profile control and displacement agents are closely related to the molecular structure of materials, aggregate size and core permeability. Their purposes are contradictory and need to be taken into account reasonably in practical application. Viscosity is an index to evaluate the internal friction of fluids. The internal friction of polymer solution is related to polymer concentration, molecular aggregate morphology and salinity of solvent water. The size of polymer aggregates can be changed by intermolecular physical association and chemical cross-linking reaction, which can increase the friction force and viscosity of polymer solution, but this will also lead to poor transport capacity of polymer solution, and then weaken the deep retention and liquid flow diversion effect of polymer solution.

Key words: profile control and displacement agent, transport ability, technical index, physical simulation, mechanism analysis

CLC Number:

TE357

Yunbao ZHANG,Xiangguo LU,Yigang LIU, et al. Technical index evaluation of transport ability of profile control and displacement agents[J]. Reservoir Evaluation and Development, 2020, 10(3): 96-103.

Figures/Tables 14

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References 25

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区块	K⁺+Na⁺	Ca²⁺	Mg²⁺	Cl^-	SO₄^2-	CO₃^2-	HCO₃^-	总矿化度
QHD32-6油田	921.72	75.1	7.5	737.5	12.6	61.6	1 077.7	2 893.7
大港港西三区	1 900.00	35.0	18.0	1 162.0	12.0	0	3 224.0	6 726.0

方案编号	渗透率（K_g）/10^-3 μm²	各区间压差δP/MPa			β₁（δP_1-2/δP_2-3）	β₂（δP_1-2/δP_3-出口）
方案编号	渗透率（K_g）/10^-3 μm²	δP_1-2	δP_2-3	δP_3-出口	β₁（δP_1-2/δP_2-3）	β₂（δP_1-2/δP_3-出口）
1-1	800	0.083 5	0.003 9	0.002 1	21.41	39.76
1-2	2 400	0.022 8	0.002 4	0.001 4	9.50	16.29
1-3	4 800	0.009 8	0.001 2	0.000 8	8.17	12.25

方案编号	渗透率（K_g）/10^-3 μm²	阻力系数（F_R）	残余阻力系数（F_RR）		封堵率/%
方案编号	渗透率（K_g）/10^-3 μm²	阻力系数（F_R）	3 d	7 d	封堵率/%
1-1	800	14.92	5.36	7.14	86.0
1-2	2 400	12.47	4.52	5.78	82.7
1-3	4 800	8.43	3.37	4.06	75.3

方案编号	渗透率（K_g）/10^-3 μm²	各区间压差δP/MPa			β₁（δP_1-2/δP_2-3）	β₂（δP_2-3/δP_3-出口）
方案编号	渗透率（K_g）/10^-3 μm²	δP_1-2	δP_2-3	δP_3-出口	β₁（δP_1-2/δP_2-3）	β₂（δP_2-3/δP_3-出口）
2-1	4 000	0.010	0.004	0.003	2.50	3.33
2-2	12 000	0.006	0.003	0.002	2.00	3.00
2-3	18 000	0.003	0.001	0.001	3.00	3.00

方案编号	渗透率（K_g）/10^-3 μm²	阻力系数（F_R）	残余阻力系数（F_RR）	封堵率/%
2-1	4 000	18.33	51.28	98.95
2-2	12 000	16.67	57.69	98.13
2-3	18 000	12.49	63.87	98.43

Technical index evaluation of transport ability of profile control and displacement agents

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聚合物类型	浓度/（mg·L^-1）	视黏度/（mPa·s）	各区间压差δP/MPa			β值
聚合物类型	浓度/（mg·L^-1）	视黏度/（mPa·s）	δP_1-2	δP_2-3	δP_3-出口	β₁	β₂
抗盐聚合物	1 750	349.9	0.181	0.007	0.007	25.9	25.9
普通聚合物	3 400	352.9	0.070	0.050	0.040	1.4	1.3

聚合物类型	聚合物浓度/（mg·L^-1）	聚合物分子聚集体尺寸（D_h）/nm		损失率/%
聚合物类型	聚合物浓度/（mg·L^-1）	原始样	采出液	损失率/%
抗盐聚合物	1 750	876.1	446.1	49.1
普通聚合物	3 400	246.7	198.6	19.5

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方案编号	渗透率（K_g）/10^-3 μm²	阻力系数（F_R）	残余阻力系数（F_RR）
3-1	440	2.07	1.46
3-2	1 200	1.86	1.35
3-3	2 400	1.67	1.26