耐温抗压封堵剂封井技术研究及应用

Research and Application of Sealing Technology for Temperature and Temperature Sealing Agent

文留油田进入开发后期,由于断层多,油层埋藏深,同时具有高温(80-130℃)、高压、高矿化度(15×10~4~35×10~4mg/L)的地质特点,导致油水井套管腐蚀、损坏严重,造成大量油水井报废封井。今年以来,对全厂报废井进行了现场调查,根据调查我厂目前共有长期报废井48口,经与地质结合,急需下步封井治理的井有26口。以前一般都采取井口安装套管帽、注灰打灰塞封井,由于受长期周围注水井注水影响,油层压力越来越高,灰塞失效导致井口油水冒出,不但造成环境污染,而且影响了邻井的有效注水。因此,必须优化报废处理工艺,采取挤堵封井工艺,实现对油层射孔段的永久性封堵。

In the later stage of the development of Wenliu Oilfield, due to the large number of faults, the buried layer of the reservoir has high temperature （80-130 ℃ ）, high pressure and high salinity （15-35 × 10^4mg/1）, Tube corrosion, serious damage, resulting in a large number of oil wells scrapped.This year, we conducted a field investigation of the whole plant scrapped wells, according to the survey I plant a total of 48 long-term retirement wells, with the geological integration, the urgent need for further closure of the wells there are 26 wells.In the past, I plant generally take the wellhead to install the casing cap, the gray ash plug, due to the long-term water injection around the water injection, the oil pressure is getting higher and higher, the ash plug failure led to the wellhead oil and water, not only cause environmental pollution, But also affect the effective water injection in the adjacent wells. Therefore, we must optimize the scrapping process, to plug the closure process, to achieve a permanent closure of the perforation of the reservoir.