耐高温泡沫树脂低伤害均匀固砂技术

High Temperature Resistant Foam Resin Sand Consolidation Technology with Uniform and Low Damage

针对常规泡沫树脂体系耐温性较差和辽河油田疏松砂岩稠油油藏化学固砂储层伤害大与有效期短的问题,以环氧树脂、酚醛树脂、疏水纳米SiO_(2)、硅烷偶联剂等为原料制得纳米改性树脂基液,然后加入固化剂、乳化剂、起泡剂、稳泡剂等添加剂制得泡沫树脂固砂体系。评价了该体系的固化温度、固砂强度、渗透性能、耐温性能和非均质多层注入性能;研发了配套的泡沫发生器,形成了耐高温泡沫树脂低伤害均匀固砂技术,并在辽河油田进行了现场应用。结果表明,泡沫树脂固砂体系的最优配方为:20%~30%树脂基液+8%~12%酚醛胺类固化剂+0.3%乳化剂OP-10+0.5%起泡剂有机硅表面活性剂+0.1%固体稳泡剂纳米SiO_(2)+0.1%聚合物稳泡剂聚乙二醇+57%~71%清水。该体系的起泡体积约为发泡前的7倍、半衰期大于20 min,可在35℃以上固化,固化后耐温可达280℃,既具有低温固化的特点,又具有耐高温的特点。在不同温度下固化的泡沫树脂固结岩心的抗压强度达到5 MPa以上,固砂强度高,满足疏松砂岩固砂强度的要求。对用0.25~0.42 mm石英砂制得的固结岩心的固砂渗透率达到4.8μm2,优于常规树脂固砂剂(1.9μm~2)。在非均质多油层中可明显防止高渗透层突进,改善固砂剂注入剖面,实现均匀固砂。现场试验取得良好的防砂效果,验证了该技术可实现均匀固砂和低伤害特性。利用泡沫树脂流体特性实现非均质多油层均匀固砂,达到了提高化学固砂效果和防砂有效期的目的。

In order to solve the problems of poor temperature resistance of conventional foam resin system,great damage to chemical sand solidification reservoir and short validity period in loose sandstone heavy oil reservoir of Liaohe oilfield,nano-modified resin base liquid was prepared by using epoxy resin,phenolic resin,hydrophobic nano-SiO_(2) and silane coupling agent as raw materials,and then adding curing agent,emulsifier,foaming agent,foaming stabilizer and other additives to prepare foam resin sand solidification system.The consolidation temperature,sand strength,permeability,temperature resistance and heterogeneous multilayer injection performance of the system were evaluated.A matching foam generator was developed,and then a high temperature resistant foam resin sand consolidation technology with uniform and low damage was formed.Finally,it was applied in Liaohe oilfield.The results showed that the optimum formula of the foam resin sand consolidation system was obtained as follows:20%—30%resin base solution,8%—12%phenolic amine curing agent,0.3%emulsifier OP-10,0.5%foaming agent organic silicon surfactant,0.1%solid foam stabilizer nano-SiO_(2),0.1%polymer foam stabilizer polyethylene glycol,57%—71%water.The foaming volume of the system was increased by 6 times,meanwhile the half-life was greater than 20 min.It could be cured above 35℃,and the temperature resistance after curing could reach 280℃,which had the characteristics of low temperature curing and high temperature resistance.The compressive strength of the foam resin solidified core at different temperature was more than 5 MPa,and the sand consolidation strength was high,which could meet the requirements of unconsolidated sandstone.The sand permeability of the consolidated core prepared with 0.25—0.42 mm quartz sand was 4.8μm2,which was better than that of conventional resin sand consolidation agent(1.9μm2).It could prevent the penetration of highly permeable layer,improve the injection profile of sand consolidation agent,and achieve uniform sand consolidation.Good sand control results were obtained in the field test,which verified that the technology could achieve uniform sand consolidation and low damage characteristic.Using the fluid characteristics of foam resin to achieve uniform sand consolidation in heterogeneous multiple reservoirs,the purpose of improving the effect of chemical sand consolidation and the validity of sand control was achieved.