压裂用VFM超疏水高分子覆膜砂的制备及其性能研究

通过高分子膜自组装技术制备了VFM超疏水界面砂,研究了VFM高分子膜的表面形态和疏水结构,以及覆膜材料对压裂砂破碎率和单颗粒抗压强度的影响。通过水、煤油、江汉油田S106-1、S106-3、SG106井的原油和返排水在疏水砂柱中和空白砂柱中的渗透率对比试验,可知油井排水在疏水砂柱中的渗透率比原油的渗透率小得多。通过水油阻力比值(NFRR)评价实验研究了VFM超疏水界面砂的油相渗透性和控水性能。室温20℃、围压2 MPa VFM超疏水界面砂的NFRR值可达到5.37。支撑剂的短期导流能力受闭合压力和材料本身的影响最明显。VFM支撑剂导流能力最大,在室温20℃、围压50 MPa导流能力可达120 mm2·cm。

Study on Preparation and Properties of Reservoir Fracturing Sands Coated with Super Hydrophobic VFM Film

Super hydrophobic interface sand with good pro-oil hydrophobic property was prepared through the VFM self-assembly technology.The surface morphology and hydrophobic structure of VFM polymer film and its effect on sand crushing rate and single grain compressive strength of the fracturing sand have been studied.By studying the permeabilities of VFM coated sand and native sand columns in water,kerosene,oil and water from Jianghan Oilfield S106-1,S106-3,SG106 wells,it was found that the penetration rate of well water is much smaller than that of crude oil in the VFM coated sand column.The relative oil and water permeability of the VFM coated sand columns was studied by NFRR method.The NFRR value reaches 5.37 at 20 ℃ and a ambient pressure of 2 MPa.The short-term permeability of the sand column was affected by pressure and the native properties of the material.The permeability was about 120 mm2·cm at 20 ℃ and 50 MPa.