自生泡沫树脂固砂体系性能研究

Study on properties of autogenetic foam resin for consolidating sand system

为解决泡沫型树脂固砂体系成本较高、制备工艺复杂、高温高压油藏时预期防砂效果较差等难题,着重开展了自生泡沫树脂固砂体系的性能研究。以价格低廉的通用型UF(脲醛树脂)作为试验对象,采用搅拌法制备了密度较低(≤0.4 g/cm^3)和泡沫性能优良的UF泡沫固砂体系;然后引入自生发泡体系,以确保固砂剂在以泡沫形式注入地层时固结岩心具有较高的渗透率。研究结果表明:在高温高压(60℃、7 MPa)条件下固结岩心的压缩强度为4.2 MPa、渗透率为3.5μm^2;该固砂体系能在油藏高温60℃条件下固化,并且固结岩心具有耐水性优、耐油性佳以及能适应地层高矿化度的环境要求,因而可应用于非均质油藏水平井、套变井及地层的2次防砂。

In order to solve the some problems （such as high- cost, complex preparation process, and poor expect sand control effect at oil pool high temperature and high pressure） of foam type resin for consolidating sand system, the properties of autogenetic foam resin for consolidating sand system were emphatically investigated. With general type UF （urea-formaldehyde resin） with low cost as test object, an UF foam for consolidating sand system with lower density （≤0.4 g/cm^3） and good foam properties was prepared by blender method. Then, the autogenetic foaming system was introduced into system, which could ensure the higher permeability of concretion core when the stratum was injected by sand consolidation agent as foam. The research results showed that the compressive strength and permeability of concretion core were 4.2 MPa and 3.5 μm^2 respectively under the condition of high temperature （60 ℃ ） and high pressure （7 MPa）. The consolidating sand system could be applied in horizontal well and casing deformation well of heterogeneous oil pool as well as secondary sand control of stratum because it could be cured under the condition of oil pool high temperature （60 ℃ ） , and the concretion core had the good water resistance and oil resistance, and could meet environmental requirement of hypersalinity in stratum.