水溶性压裂暂堵剂的研制及性能评价

发布时间：2018-06-03 10:37

  本文选题：重复压裂 + 暂堵剂　； 参考：《东北石油大学》2017年硕士论文

【摘要】：随着国际社会对原油的需求日益上涨和国际油价的上升,提高低渗透油田的产量再次成为了人们研究的重点。当前,低渗透油田提高采收率最常用的技术手段就是水力压裂。随着生产开发的进行,水力裂缝逐渐失效,储层中还有一定量的石油,这时需要重新进行重复压裂。重复压裂是对原来的炮眼或裂缝进行暂时封堵,在不同于原来裂缝方向压出一条新的裂缝,沟通未动用的储层或动用程度较低的油层,增大泄油面积,提高产能。世界各国对压裂暂堵剂的研究从未中断,随着环保意识的增强,绿色压裂暂堵剂的研发成为了重点。石油作业与环境保护相结合,研制出一种既能满足压裂施工的需求,又不对地层造成污染的暂堵剂的意义十分重要。本文在前人的基础上,通过对暂堵剂材料的筛选和暂堵剂强度的研究,研制出了水溶性压裂暂堵剂。按重量百分比计,其配方为:57%骨胶+24%磺化沥青+19%增稠剂+0.2%交联剂。暂堵剂的基本性能研究表明:暂堵剂的水溶率达到97%以上,残渣含量较低,与压裂液和地层水配伍性良好,在0.5%的胍胶压裂液中均匀分散,随矿化度升高性能稳定。通过室内岩芯模拟实验,分析了暂堵剂对缝口和缝内的封堵性能。2.5cm厚的堵剂剂缝口封堵填砂管,其突破压力为6MPa。缝内暂堵剂,研究了不同的暂堵剂浓度、不同的注入速度、不同温度等条件下的封堵、解堵和暂堵强度。实验证明:所研制的暂堵剂在温度为30℃-80℃之间,在注入浓度10%左右,注入量2-5PV之间,对裂缝能97%左右的封堵,有较高的突破压力梯度。这说明,所研制的暂堵剂能满足现场压裂施工的要求,并具有较广的应用范围,对油田重复压裂提高采收率有重要意义。
[Abstract]:With the increasing demand for crude oil in the international community and the rise in the international oil price, increasing the production of low permeability oil fields has become the focus of research again. At present, hydraulic fracturing is the most commonly used technique to improve oil recovery in low permeability oil fields. With the development of production, the hydraulic fracture gradually fails, and there is a certain amount of oil in the reservoir. Refracturing is to seal the original hole or fracture temporarily, to press a new fracture in the direction different from the original fracture, to communicate the unused reservoir or the oil reservoir with low production degree, to increase the oil leakage area and to increase the productivity. The research of fracturing temporary plugging agent has never been interrupted in the world. With the enhancement of environmental protection consciousness, the research and development of green fracturing temporary plugging agent has become the key point. Combining petroleum operation with environmental protection, it is very important to develop a temporary plugging agent which not only meets the requirements of fracturing operation but also does not cause formation pollution. In this paper, the water-soluble fracturing temporary plugging agent is developed through the screening of temporary plugging agent materials and the study of the strength of temporary plugging agent on the basis of predecessors. According to the weight percentage, the formula is: 1: 57% bone glue 24% sulfonated asphalt 19% thickener 0.2% crosslinking agent. The basic properties of temporary plugging agent are studied. The results show that the water solubility of temporary plugging agent is over 97%, the residue content is low, and it has good compatibility with fracturing fluid and formation water. It is evenly dispersed in 0.5% guanidine gel fracturing fluid, and the performance is stable with the increase of salinity. The plugging performance of temporary plugging agent for seams and seams with thickness of 2.5 cm was analyzed through laboratory core simulation experiments. The breakthrough pressure was 6 MPA. The plugging, removal and strength of temporary plugging agent under different conditions, such as different concentration of temporary plugging agent, different injection rate and different temperature, were studied. The experimental results show that the developed temporary plugging agent has a high breakthrough pressure gradient when the temperature is between 30 鈩，

本文编号：1972480