高温高盐油藏低化学交联疏水缔合聚合物成胶前溶液性能研究

针对高温高盐、低渗透油藏条件下凝胶强度、长期稳定性和大剂量注入能力之间的矛盾,提出了采用疏水缔合聚合物为主剂,物理"交联"和化学交联相结合的技术思路。提出了高温高盐、低渗透油藏条件下凝胶成胶前溶液应具备的性能要求,并且针对新疆石南4油藏条件,对以疏水缔合聚合物AP-P4为主剂的成胶前溶液进行了性能评价,试验表明,该溶液具有耐温抗盐、抗剪切、抗地层水冲稀、注入压力低的特点。

Gelling properties of low chemical linked hydrophobically associating polymer solution in high-temperature and high-salinity reservoirs

A new technological idea,which uses hydrophobically associating polymer and combines physical with chemical crosslinking,is proposed to resolve contradictions among gel intensity,long-term stability and capability of large-dosage interjection when gelling fluid is used in high temperature and high salinity reservoirs with low permeability.Furthermore,required properties of gelling solution are discussed.In view of the conditions of four reservoirs in Shinan Oilfield in Xinjiang,properties of gelling solution mainly prepared by hydrophobically associating polymer AP-P4 are evaluated.Experimental results show that the solution features in temperature resistance and salt tolerance,shearing resistance,anti-diluting of formation water and lower injection pressure.