顺北油田抗超高温柔性胶粒修井液

针对顺北高温油气井常规增黏型修井液易降解的难题，基于高分子柔性胶粒分散-降解-提黏-稳黏理论，研发了抗180 ℃ 高温柔性胶粒修井液体系，该修井液动力黏度在20～140 mPa·s范围可调，密度在1.0～1.3 g/cm3可调，实现了固相与无固相加重。明确了修井液在不同温度下的黏度变化规律，高温180 ℃ 高温老化1 d后黏度明显高于传统黄原胶体系，表现出良好的稳黏性能，该修井液对铝合金材料的腐蚀速率不超过2.22 g/(m2·h)，并且携砂效果显著。该研究对顺北高温油气井安全高效修井作业具有一定指导意义。 

Ultra-High Temperature Workover Fluid with Flexible Rubber Particles Used in Shunbei Oilfield

The conventional viscosified workover fluid used in the high temperature oil and gas wells in Shunbei Oilfield is easy to lose its viscosity. To solve this problem, a new workover fluid containing flexible rubber particles that is able to resist 180 ℃ was developed based on the fact that the viscosity of a flexible high molecular weight rubber particle changes in a pattern of “disperse, degrade, viscosify, and stabilize viscosity”. The dynamic viscosity of this workover fluid can be adjusted between 20 mPa·s and 140 mPa·s. The density of the workover fluid adjusted between 1.0 g/cm3 and 1.3 g/cm3, which means that the workover fluid can be weighted with or without solid weighting agents. The pattern of the viscosity change of the workover fluid at different temperatures was studied. After aging for 1 day at 180 ℃, the viscosity of the workover fluid was apparently higher than that of a conventional xanthan gum workover fluid, indicating that the new workover fluid had the ability of stabilizing its viscosity. The rate of corrosion of this workover fluid to aluminum alloy is less than 2.22 g/(m2·h). The workover fluid also had very good sand carrying capacity. This study has certain guiding significance for the safe and efficient workover operations of high-temperature oil and gas wells in Shunbei.