基于灰色关联法高温堵剂性能评价

Analysis of Influence Factors of High Temperature Plugging Agent Based on Gray Correlation Theory

研发出了新型耐高温调剖堵水试剂磺化改性落叶松栲胶,其典型配方为：6.0 wt%磺化改性落叶松栲胶、2.5 wt%~3.0 wt%醛类交联剂、1.0 wt%~1.5 wt%酚类促进剂P-1,其他为水,用氢氧化钠将p H调节至8~10。通过实验对改性落叶松栲胶性能进行测试。试验表明,堵剂胶凝时间4~10 h可控,满足p H在4~10范围内使用,能用于100000 mg/L的较高矿化度地层,所成凝胶强度高。采用灰色关联法对温度、矿化度、组分浓度、p H等影响因素进行分析,各因素对磺化改性落叶松栲胶成胶时间和成胶强度的影响程度从大到小依次为温度、p H、栲胶浓度、矿化度。

A new profile modifying and water shutoff agent is developed for western high temperature,low permeable oil reservoir.Its basis recipe is composed of 6. 0% modified larch tannin extract,2. 5% ~ 3. 0% formaldehyde,1. 0% ~ 1. 5% phenolic crosslinking promoter P-1 in water solution with p H value of 8 ~ 10. Properties of the modified tannin extract are tested by laboratory experiment. Based on the testing results,the agent is of a controllable profile of colloiding time of 4 ~ 10 h. It can be used at the p H range of 4 ~ 10,standing as high as 100 000 mg / L salinity with a high strength. Gray correlation theory is taken to analysis influence factors such as temperature,p H value,degree of mineralization and component concentration. Based on the calculation result,the gel time and the gel strength are affected by the following factors in a descending order： temperature,p H value,concentration of modified larch tannin extract and degree of mineralization.