Development and Performance Evaluation of Self-Generating Enhanced Foam Water Plugging System

• 作者: Chang Liu Guoyu Chu Jiexiang Wang
• 来源期刊: 电力能源(英文)
• 学科: 地球科学
• 关键词: Self-Generating ENHANCED Foam BLOCKING LOCATION Plugging PERFORMANCE WATER Plugging
• 年，卷（期）: 2019,（11）
• 页码范围: 47-54
• 页数: 8页
• 分类号: P64

摘要

For the waterflooding of late development on an offshore oilfield has become worse, and some wells group has entered into high water cut-off period, water plugging work becomes particularly important. Due to the limited construction of offshore oilfield, space water supply difficulties, and stability of plugging agent, self-generating enhanced foam has been designed as the aimed block plugging system. The formula is determined as: 23.25% of NH4Cl + 30% of NaNO2 + 0.1% of catalyst + 0.6% of COSL-3 foaming agent + 0.25% of HS-type HPAM foam stabilizer. Measurement point of pipe with permeability of 0.5 μm2 and 2 μm2 has been used in the plugging and EOR experiments. The experiments show that this system has the selective plugging effect for the heterogeneous formation, especially for middle and posterior part of high permeability formation, and the recovery rate of low permeability pipe is enhanced up to 32.15%.