Preparation Of The Water-controlling And Sand-preventing Materials

Organosilicon is provided with many fine characters such as hydrophobic, acid resistivity and thermostability, this thesis demonstrates two different water-control coatings, i.e., KH-832 and KH-1231 synthesized with two different types of organosilicon. After modifying, Carbon Black (CB) dispersed in organosilicon matrix and then hydrophobic coating can be obtained when a certain amount of tetraethoxysilane (TEOS), Dispersing agent and water are added with enough stiring. Water-control hydrophobic quartz sand was synthesized by uniformly mixing the as-synthesized hydrophobic coating and moderate quartz sand in a blender and then dried and treated at 220℃.Water inferiorly tentacles and Oil inferiorly tentacles were tested at a JC2000D contact angle instrument; the surface morphology of coating was observed at a high-resolution microscope and the mirco-structure of the coating was observed at SEM; the rank of adhesion was investigated by the cross cut test; the molecular structure of the coating was obtained by FTIR.The present work showed the modified CB can stably dispersed in organosilicon for a long time; the water inferiorly tentacles of KH-832 and KH-1231 coating can reach max to 107.5°and 120.2°respectively and these two materials both have excellent properties of medium resistance and water resistance thermostability; SiO2 gel can promote the adhension of coating and quartz sand; there are no differences between the materials that synthesized with wet and dry process; the water-control properties of KH-1231 is better than KH-832 with the comparison of the NFRR of the two materials and the thickness of KH-1231 was much thicker when reaching formation pressure drop of 2 MPa.