深圳大学学报理工版

刘晓强,曲占庆,叶卫保,等.径向井引导堵剂注入油井堵水数值模拟[J].深圳大学学报理工版,2018,35(No.6(551-660)):566-574.[doi:10.3724/SP.J.1249.2018.06566]
LIU Xiaoqiang,QU Zhanqing,YE Weibao,et al.Numerical simulation of water plugging from oil well with plugging agent injection guided by radial well[J].Journal of Shenzhen University Science and Engineering,2018,35(No.6(551-660)):566-574.[doi:10.3724/SP.J.1249.2018.06566]

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径向井引导堵剂注入油井堵水数值模拟

刘晓强¹,曲占庆¹,叶卫保²,郭天魁¹,李通³,田启忠⁴,吕玮⁴

1)中国石油大学(华东)石油工程学院,山东青岛 266580; 2)山东石大油田技术服务股份有限公司,山东东营 257000; 3)华北油田公司第三采油厂,河北沧州 062450; 4)中石化胜利油田石油工程技术研究院,山东东营 257000

关键词：水流优势通道; 径向井; 油井堵水; COMSOL数值模拟; 精准投放; 注入压力降低

Numerical simulation of water plugging from oil well with plugging agent injection guided by radial well

LIU Xiaoqiang¹, QU Zhanqing¹, YE Weibao², GUO Tiankui¹, LI Tong³, TIAN Qizhong⁴, and LÜ Wei⁴

1)College of Petroleum Engineering, China University of Petroleum(East China), Qingdao 266580, Shangdong Province, P.R.China2)Shandong Shida Oilfield Technical Services Co. Ltd., Dongying 257000, Shangdong Province, P.R.China3)The Third Oil Production Plant, PetroChina Huabei Oilfield Company, Cangzhou 062450, Hebei Province, P.R.China4)Petroleum Engineering Technology Research Institute of Shengli Oilfield, Sinopec, Dongying 257000, Shangdong Province, P.R.China

Keywords： water-dominant flowing channel; radial well; water plugging in oil well; numerical simulation by COMSOL; agent placement; injection pressure reduction

DOI: 10.3724/SP.J.1249.2018.06566

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油井堵水作为一种封堵水流优势通道的方法已在油田广泛应用,为解决传统的堵剂笼统注入油井堵水方法所面临的污染油藏和注入压力大的问题,提出一种具有精准投放和降压增注功能的径向井引导堵剂注入油井堵水新工艺,建立了数学模型,通过COMSOL软件对堵水效果进行了评价.数值模拟结果表明,径向井引导堵剂注入适用于渗透率级差低的非均质油藏.堵剂在水流优势通道内沿径向井作径向流动,实现堵剂的精准投放.注入压降集中分布在径向井周围,等压线以径向井为轴线对称分布,高注入压力随径向井长度的增加而深入地层深处.径向井增大了堵剂注入面积,堵剂在水流优势通道内流动阻力小,减小了注入压力.堵剂注入时间取决于水流优势通道宽度和堵剂注入速度,注入时间过长,堵剂将逐渐进入到低渗地层,对油藏造成污染.径向井长度取决于堵剂强度和地层压力梯度,堵剂前缘所在地层压力梯度要小于堵剂突破强度.径向井数目取决于水流优势通道宽度和地层深度,当层内非均质地层厚度小于水流优势通道宽度时,采用单径向井,反之纵向上布置多个径向井.

Water plugging technique for oil production wells has been widely applied in oilfields as a method to plug the dominant channel of water flow. In order to solve the problems of reservoir pollution and high injection pressure caused by the conventional plugging methods with general injection of plugging agent into oil well, a new technology of water plugging in oil wells with plugging agent injection guided by the radial well is proposed, with the advantage of more accurate injection of plugging agent and effective reduction of injection pressure. A numerical model is established by using COMSOL software for the evaluation of the water plugging effect. Numerical simulation results show that plugging agent injection guided by radial well is suitable for heterogeneous reservoir with lower permeability ratio. Plugging agent flows radially along the radial well in the water-dominant flow channel to realize the accurate injection of plugging agent. Injection pressure drop concentrates around the radial well nearby, the isopiestic lines distribute symmetrically along the radial well. With the increase of the radial well length, the high injection pressure goes deep into the remote reservoir, and the contacted area of plugging agent is increased, the flow resistance of plugging agent in the water-dominant flowing channel is smaller, the injection pressure is mitigated. In addition, the injection time of plugging agent depends on the width of water-dominant flowing channel and the injection velocity of plugging agent. While the injection time is too long, the plugging agent will gradually flow into the low permeability formation and then cause the pollution in reservoir. Also, the length of radial well depends on the strength of plugging agent and the gradient of formation pressure. The formation pressure gradient at the front edge of plugging agent should be less than the breakthrough strength of plugging agent. The numbers of radial wells depend on the width of water-dominant flowing channel and the depth of reservoir formation. While the thickness of heterogeneous formation is less than the width of water flow dominant belt, a single radial well should be enough to solve the problems. Otherwise, several radial wells will be needed vertically.

引言
1 径向井引导堵剂注入数学模型
2 数值结果分析
3 结论

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