Research and Application of Low Surface Energy Anti-wax Technology in Changqing Oilfield

With the extension of production time, severe wax deposition occurred in some horizontal well developmentreservoirs in Changqing Oilfield. Conventional dosing measures have poor effect and high frequent cost of hot washing. In order to ensure the normal production of oil wells, a low surface energy wax prevention technology is proposed according to the wax deposition characteristics of horizontal wells and the factors affecting wax deposition. By coating the inner surface of the tubing with hydrophobic and smooth inner coating, the inner wall of the tubing with low surface energy is formed to prevent wax crystal adsorption and play the rule of wax prevention. At the same time, the influencing factors of wax prevention effect of coated tubing were studied, the critical surface energy of low surface energy wax prevention technology was determined, and the coating selection chart under different working conditions was formulated to guide the field application.