A Solidified Controllable Resin System Suitable for Fracture Cavity Formation Plugging and Its Performance Characterization.

IF 5 3区 化学 Q1 POLYMER SCIENCE
Gels Pub Date : 2024-09-20 DOI:10.3390/gels10090599
Shuanggui Li, Biao Qi, Qitao Zhang, Jingbin Yang
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引用次数: 0

Abstract

Thermosetting resins have good temperature resistance and high strength and have been widely used as plugging agents in oil fields. However, the current resin materials have high costs, and unmodified thermosetting resins are brittle or have deteriorated properties such as flame retardancy after curing to form a crosslinked network structure. In this study, the resin was modified via physical blending. The curing strength and temperature resistance were used as the main indicators. The resin matrix, curing agent, rheology modifier, and filling materials were modified and formulated optimally to form a high-strength resin gel plugging system. The resin gel system exhibited good fluidity and pumpability. When the shear rate was 200 s-1 at 25 °C, the initial viscosity was 300-400 mPa·s. The viscosity gradually decreased with increasing shear rate, and the apparent viscosity had good long-term stability at room temperature. A contamination test of different types of drilling fluids on the resin gel system showed that this system had good anti-contamination capability and could maintain a high curing strength even after being contaminated. At the same time, the system exhibited good plugging capability. A wedge-shaped fracture with an inlet size of 7 mm and an outlet size of 5 mm was plugged at 12.84 MPa for 10 min without leakage. A sand-filling pipe (with a diameter of 3.8 cm and pipe length of 30 cm) connected to the pipeline with a 6 mm outlet was subjected to a constant pressure of 11.29 MPa and plugged for 8 min before breaking through. Therefore, it exhibited good capability for plugging fissures and cavities. The resin gel leakage-plugging system has significant potential to realize effective plugging of the deep large-fracture leakage layer.

适用于裂隙空腔地层封堵的可控固化树脂体系及其性能表征。
热固性树脂具有良好的耐温性和高强度,被广泛用作油田的堵塞剂。然而,目前的树脂材料成本较高,而且未经改性的热固性树脂在固化形成交联网络结构后会变脆或阻燃等性能下降。在本研究中,通过物理混合对树脂进行了改性。固化强度和耐温性是主要指标。通过对树脂基体、固化剂、流变改性剂和填充材料进行改性和优化配制,形成了一种高强度树脂凝胶堵塞体系。该树脂凝胶体系具有良好的流动性和泵送性。当剪切速率为 200 s-1 时,初始粘度为 300-400 mPa-s。随着剪切速率的增加,粘度逐渐降低,表观粘度在室温下具有良好的长期稳定性。不同类型钻井液对树脂凝胶体系的污染测试表明,该体系具有良好的抗污染能力,即使受到污染也能保持较高的固化强度。同时,该体系还具有良好的堵塞能力。一个入口尺寸为 7 毫米、出口尺寸为 5 毫米的楔形裂缝在 12.84 兆帕的压力下堵塞了 10 分钟,没有泄漏。一根直径为 3.8 厘米、管长为 30 厘米、出口尺寸为 6 毫米的充砂管与管道相连,在 11.29 兆帕的恒定压力下堵塞了 8 分钟后发生破裂。因此,它在堵塞裂缝和空洞方面表现出良好的能力。树脂凝胶堵漏系统在实现深大裂缝渗漏层的有效堵漏方面潜力巨大。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Gels
Gels POLYMER SCIENCE-
CiteScore
4.70
自引率
19.60%
发文量
707
审稿时长
11 weeks
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