Development of Dispersed Copolymer Particle System for Profile Control in Offshore Oilfield
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摘要:
为了对海上油田中高含水期非均质油层进行剖面调整，以丙烯酰胺（AM）为主剂，N, N亚甲基双丙烯酰胺（MBA）为交联剂，合成了网状结构的高黏聚合物，经研磨控制技术处理后，制得分散共聚物颗粒体系。试验结果表明，在AM质量分数（5%）和AM/MBA质量比（250∶1）一定的条件下，研磨速率和研磨时间对粒径分布影响较大。封堵运移性能评价试验结果表明，分散共聚物颗粒体系具有良好注入性、深部运移能力及封堵性能，在等用量条件下，分散共聚物颗粒的封堵能力显著优于聚合物凝胶。研究表明，研制的分散共聚物颗粒粒径分布宽，纳米至微米级别可控，且可实现在线注入，具有制备工艺简单、成本低、抗高温和环保等特点，对海上中高含水期油田剖面调整具有较好的适用性，可在现场推广应用。
Abstract:A high-viscosity polymer was developed in order to adjust the profile of heterogeneous offshore oilfields in the middle-high water cut period. Performance advantages were achieved by taking acrylamide (AM) as the main agent and N, N methylenebisacrylamide (MBA) as the crosslinker. This polymer can be processed by the grinding control technology to obtain a dispersed copolymer particle system. The experimental results showed that the grinding rate and grinding time had a large impact on the particle size distribution for the given monomer mass fraction (5%) and the AM/MBA mass ratio of 250 to 1. The results of plugging and migration experiment under simulated formation conditions indicated that the dispersed copolymer particle system had good injectability, deep migration ability and plugging performance. For the given dosage, the plugging ability of dispersed copolymer particles was significantly better than that of the polymer gel. The research suggested that the particle size distribution of this system was wide and controllable in the nanometer to micrometer level, making online injection possible. The system has the advantages of simple formulating process, low cost, temperature resistance and environmental protection, etc. It possesses good applicability in offshore oilfields for the profile control in the middle-high water cut period, and can be promoted and applied in oilfields.
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Keywords:
- dispersed copolymer particle /
- preparation /
- performance test /
- profile control /
- offshore oilfield
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图 1 分散共聚物颗粒的粒径分布随研磨时间变化情况
Figure 1. The change of particle size distribution of dispersed copolymer with grinding time
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图 2 3%分散共聚物颗粒溶液的流变曲线
Figure 2. Rheological curve of 3% dispersed copolymer particles solution
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图 3 60 ℃下的分散共聚物颗粒溶液稳定性动力学指数测试结果
Figure 3. The test results of stable dynamic index for dispersed copolymer particles solution at 60 ℃
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图 4 分散共聚物颗粒和聚合物凝胶体系入口压力随注入量的变化曲线
Figure 4. Variation of inlet pressure of dispersed copolymer particles and polymer gel systems with the injection volume
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图 5 后续水驱阶段模型内部压力的变化
Figure 5. Pressure change inside the model in the subsequent water flooding stage
表 1 共聚物的制备参数
Table 1 Preparation parameters of the copolymer
AM质量分数，
%AM/MBA
质量比合成时间/
h共聚物黏度/
（mPa·s）5 167∶1 2.0 16 460 5 250∶1 2.5 15 320 
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表 2 分散共聚物颗粒粒径随研磨时间的变化
Table 2 Viscosity change of dispersed copolymer particles in grinding process
剪切时间/min 平均粒径/μm 最大粒径/μm 最小粒径/μm 1 1 520.0 3 080.0 31.1 5 135.0 352.0 4.6
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