低初黏可控聚合物凝胶在油藏深部优势渗流通道的封堵方法及应用

doi:10.7623/syxb202008006

石油学报 ›› 2020, Vol. 41 ›› Issue (8): 969-978.DOI: 10.7623/syxb202008006

低初黏可控聚合物凝胶在油藏深部优势渗流通道的封堵方法及应用

程杰成¹, 周泉¹, 周万富¹, 王庆国¹, 施伟光^2,3

1. 大庆油田有限责任公司黑龙江大庆 163002;
2. 东北石油大学陆相页岩油气成藏及高效开发教育部重点实验室非常规油气研究院黑龙江大庆 163318;
3. 东北石油大学化学化工学院黑龙江大庆 163318

收稿日期:2019-09-11 修回日期:2020-06-18 出版日期:2020-08-25 发布日期:2020-09-01
通讯作者: 王庆国,男,1971年6月生,1993年获吉林大学学士学位,2015年获吉林大学博士学位,现为大庆油田有限责任公司采油工程研究院高级工程师,主要从事油田化学、三次采油方面工作。Email:wqg@petrochina.com.cn;施伟光,男,1979年5月生,2003年获吉林大学学士学位,2010年获吉林大学博士学位,现为东北石油大学副教授,主要从事油田化学、提高采收率技术方面的研究工作。Email:sswwgg2003@126.com
作者简介:程杰成,男,1962年9月生,1983年获黑龙江大学学士学位,2000年获大连理工大学博士学位,现为大庆油田有限责任公司首席技术专家、教授级高级工程师,主要从事提高采收率技术工作。Email:chengjiecheng@petrochina.com.cn
基金资助:
国家科技重大专项"大庆长垣特高含水油田提高采收率示范工程"（2016ZX05054）资助。

Plugging method of polymer gel with controllable low initial viscosity for dominant flow paths in deep reservoirs and its application

Cheng Jiecheng¹, Zhou Quan¹, Zhou Wanfu¹, Wang Qingguo¹, Shi Weiguang^2,3

1. Daqing Oilfield Company Limited, Heilongjiang Daqing 163002, China;
2. Key Laboratory of Continental Shale Hydrocarbon Accumulation and Efficient Development, Ministry of Education;Unconventional Oil & Gas Research Institute, Northeast Petroleum University, Heilongjiang Daqing 163318, China;
3. College of Chemistry and Chemical Engineering, Northeast Petroleum University, Heilongjiang Daqing 163318, China

Received:2019-09-11 Revised:2020-06-18 Online:2020-08-25 Published:2020-09-01

摘要/Abstract

摘要：

聚合物凝胶调剖技术可以有效治理水驱油层水流优势渗流通道并提高采收率。通过建立凝胶调剖剂在非均质渗透层间渗流的理论模型，分析了凝胶调剖剂的黏度对优势渗流通道封堵的作用效果；研发了低初始黏度、具有pH值响应、成胶强度和交联时间可控的聚丙烯酰胺/柠檬酸/铬凝胶体系。在10 m长岩心和3管并联岩心进行封堵模拟实验，测试了聚合物凝胶体系剪切后的自修复黏度等流变学参数，研究了分流率、注入压力以及凝胶封堵的微观形态。研究结果表明：聚合物凝胶体系的低初始黏度是优先封堵地层深部高渗透层优势渗流通道、扩大波及体积的关键参数，聚合物凝胶体系的初始黏度低于10 mPa·s、延迟交联时间控制在30 d以上。长岩心封堵后水驱各段压力梯度比注入聚合物后续水驱时提高了6.55倍；经扫描电镜微观测试发现在岩心不同位置孔隙中存在明显的膜状凝胶；在并联岩心中，当低初黏可控聚合物凝胶进入水窜流的高渗层封堵后，注入水高渗层分流率由72.7%降低为0.7%。大庆油田1井组（6注12采）深部调剖现场试验结果表明，注水压力从7.8 MPa上升到9.8 MPa；8口连通油井日产液量下降16.2%，阶段累积增油563 t。低初黏可控聚合物凝胶对油藏深部优势渗流通道实现了有效封堵。

关键词: 低初始黏度, 延迟交联, 聚合物凝胶, 窜流理论, 高渗层, 封堵

Abstract:

The polymer gel profile control technique can effectively control the dominant flow paths of water flow in the water drive reservoir and also improve the recovery efficiency. This paper establishes a theoretical model for the flow of gel profile control agent between heterogeneous permeable strata, and analyzes the effect of the viscosity of gel profile control agent on the plugging of dominant flow paths. An HPAM/citric acid/chromium gel system of low initial viscosity, pH response, gelling strength and controllable crosslinking time was designed. A plugging simulation experiment was carried out with a 10 m long core and a three-pipe parallel cores system. The rheological parameters such as the self-repaired viscosity of the polymer gel system after shearing were tested. Moreover, a characterization was performed on the fractional flow rate, injection pressure and the micro morphology of gel plugging. As a result, the low initial viscosity of the polymer gel system is the key parameter for expanding the swept volume and preferentially plugging the dominant flow paths in deep high-permeability strata. The initial viscosity of the polymer gel system is less than 10 mPa·s, and the delayed crosslinking time is controlled more than 30 d. After the long-core plugging experiment, the pressure gradient of each section during water flooding increased by 6.55 times than that of polymer injection. A clear film-like gel was found in different pores in the core by SEM testing. In parallel cores, after the high-permeable water channeling strata were plugged with the controllable low initial viscosity polymer gel, the water-injection rate was reduced from 72.7% to 0.7%. The field test results of deep profile control in the well of 1 group (6 injection wells and 12 production wells)in the Daqing Oilfield show that the water injection pressure increased from 7.8 MPa to 9.8 MPa. The daily liquid-producing capacity of 8 connected oil wells decreased by 16.2%, and the oil accumulation in this stage was increased to be 563 t. The polymer gel with controllable low initial viscosity can effectively plug the dominant flow paths in deep reservoirs.

Key words: low initial viscosity, delayed crosslinking, polymer gel, channeling theory, high permeable strata, plugging

中图分类号:

TE357.46

程杰成, 周泉, 周万富, 王庆国, 施伟光. 低初黏可控聚合物凝胶在油藏深部优势渗流通道的封堵方法及应用[J]. 石油学报, 2020, 41(8): 969-978.

Cheng Jiecheng, Zhou Quan, Zhou Wanfu, Wang Qingguo, Shi Weiguang. Plugging method of polymer gel with controllable low initial viscosity for dominant flow paths in deep reservoirs and its application[J]. Acta Petrolei Sinica, 2020, 41(8): 969-978.

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低初黏可控聚合物凝胶在油藏深部优势渗流通道的封堵方法及应用

Plugging method of polymer gel with controllable low initial viscosity for dominant flow paths in deep reservoirs and its application

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