钻采工艺 ›› 2021, Vol. 44 ›› Issue (1): 87-90.DOI: 10.3969/J. ISSN.1006-768X.2021.01.19

• 开采工艺 • 上一篇    下一篇

混合粒径支撑剂回流实验及在临兴致密气藏中的应用

白昊田1,2,许冬进1,2,张滨海3,李紫晗3,黄晶3,张智盛4   

  1. 1非常规湖北省协同创新中心  2中国石油天然气集团公司采油采气重点实验室长江大学分室  3中海油研究总院有限责任公司  4中石油青海油田采油三厂花土沟采油作业区
  • 出版日期:2021-01-25 发布日期:2021-01-25
  • 作者简介:白昊田(1994-),硕士研究生,研究方向:非常规油气开发与储层改造。地址:(430100)湖北省武汉市蔡甸区大学路111号长江大学石油工程学院,电话:18086458245,E-mail:2740426010@ qq. com
  • 基金资助:
    国家自然科学基金项目“基于Hybrid数据的复杂系统辨识与优化设计及在低渗透油井中的应用”(编号:61572084);国家“十三五”重大专项项目“CO2驱油藏全生命周期举升工艺及配套技术研究”(编号:2016ZX05056004-002);国家“十三五”重大专项项目“准噶尔盆地致密油开发示范工程”(编号:2017ZX05070)。

Experimental Study on Mixed Particle Size Proppant Reflux and its Application in Linxing Tight Gas Reservoir      

BAI Haotian1,2, XU Dongjin1,2, ZHANG Binhai3, LI Zihan3, HUANG Jing3, ZHANG Zhisheng4   

  1. 1. Unconventional Hubei Collaborative Innovation Center, Yangtze University, Wuhan, Hubei 430100, China; 2. CNPC Key Laboratory of Oil Production and Gas Production, Yangtze University, Jinzhou, Hubei 434023, China; 3. CNOOC Research Institute Co. , Ltd. , Beijing 100028, China; 4. Huatugou Oil Production Area ofNo. 3 Oil Production Plant of Qinghai Oilfield, Haixi, Qinghai 816499, China
  • Online:2021-01-25 Published:2021-01-25

摘要: 压裂施工结束后须将储层中的压裂液进行快速返排以减少对地层的伤害。合理的返排制度是压后高产的关键,返排速度过低或返排不及时会对储层造成伤害,速度过高易产生支撑剂回流,损害裂缝的导流能力。为了控制支撑剂回流造成的损失,以临兴致密气藏为研究对象,通过室内实验研究两种粒径支撑剂混合铺砂后的回流规律与两种粒径单独铺砂时进行对比;为了达到降本增效的目标,分别用等效替代法和控制变量法研究石英砂替代陶粒后,石英砂支撑剂在回流时达到陶粒支撑剂临界流速所对应的铺砂浓度倍数。实验结果表明,混合铺砂时的临界流速变化趋势与两种粒径单独铺砂时相同;用石英砂替代陶粒,可高效返排,控制支撑剂回流,以达到降本增效的目的。

关键词: 支撑剂回流, 混合粒径, 降本增效, 等效替代法, 控制变量法

Abstract:

 After the fracturing operation, the fracturing fluid in the reservoir must be quickly backflowed to reduce its damage to the formation. Reasonable flowback system is the key to high production after fracturing. If the flowback speed is too low or not timely, it will cause damage to the reservoir. If the flowback speed is too high, it will cause proppant backflow and damage the conductivity of the fracture. In order to control the loss caused by proppant backflow, taking Linxing dense gas reservoir as the research object, the backflow law of two kinds of particle size proppant after mixed sand paving was compared with that of two kinds of particle size proppant alone. In order to achieve the goal of cost reduction and efficiency improvement, the equivalent substitution method and the control variable method were used to study the sand laying concentration multiples corresponding to the critical flow rate of ceramsite proppant when quartz sand proppant was refluxed after replacing ceramsite with quartz sand. The experimental results show that the change trend of the critical flow velocity in the mixed sand-laying is the same as that in the single sand-laying. Replacing ceramsite with quartz sand can effectively flow back and control proppant reflux, so as to reduce cost and increase efficiency.

Key words: proppant flowback, mixed particle size, cost reduction and efficiency improvement, equivalent substitution method, controlled variable method.