橡胶颗粒增强双网络结构堵水冻胶性能研究

目的研究橡胶颗粒增强双网络结构堵水冻胶性能,解决塔河油田为代表的缝洞型油藏在注水开发、注气开发过程中,出水、气窜现象频发的问题。方法选用丙烯酰胺/2-丙烯酰胺-2-甲基丙磺酸二元聚合物和疏水缔合聚合物为主剂,乌洛托品、间苯二酚和有机铬为交联剂,橡胶颗粒为增强剂制备了一种复合冻胶,详细考查了橡胶颗粒对冻胶基液黏度、成胶时间、成胶强度、耐稀释、耐温耐盐性能和封堵效果的影响规律。 结果橡胶颗粒的加入,对冻胶基液黏度和成胶时间没有明显的改变,但对成胶强度、耐温耐盐性能和封堵效果具有明显提高作用。其中,橡胶颗粒质量分数为5%的增强冻胶的屈服应力达326.4 Pa,150 ℃下老化30天,脱水率仅为2.71%,对缝宽1 mm的裂缝岩心进行封堵,盐水突破压力梯度达到3.94 MPa/m。这表明,橡胶颗粒增强的双网络结构冻胶具有优异的封堵能力。结论该研究填补了塔河油田耐高温高盐堵水冻胶的技术空白,为塔河油田堵水技术发展提供了新的研究思路。 

Study on the properties of rubber particles reinforced double network structure gel

ObjectiveThe performance of rubber particles reinforced double network structure gel was studied to solve the problem of frequent water and gas channeling in the process of water injection and gas injection in the fracture-vuggy reservoir represented by Tahe Oilfield. Methods Using acrylamide/2-acrylamide-2-methylpropanesulfonic acid binary polymer and hydrophobic association polymer as the main agents, urotropine, resorcinol, organic chromium as crosslinking agents, and rubber particles as reinforcing agents. The effects of rubber particles on the viscosity of the gel base liquid, gelling time, gelling strength, dilution resistance, temperature and salt resistance, and plugging effect were investigated in detail. ResultsThe research results showed that the addition of nanoparticles had no significant effect on the viscosity and gelling time of the gel base liquid, but it significantly improved the gelling strength, temperature and salt resistance and blocking effect. Among them, 5% of the rubber particles were enhanced. The yield stress of the gel reaches 326.4 Pa. After aging at 150 ℃ for 30 days, the dehydration rate was only 2.71%. When the fracture core with a crack width of 1 mm was blocked, the breakthrough pressure gradient of salt water reached 3.94 MPa/m.This indicated that the double network structure gel reinforced by rubber particles had excellent blocking ability. ConclusionThis study fills the technical gap of high-temperature and high-salt water plugging gel in Tahe Oilfield. It provides new research ideas for development of water plugging technology in Tahe Oilfield.