盐水侵污对有机盐钻井液性能的影响

Effect of Salt Water Intrusion on Performance of Organic Salt Drilling Fluid

王志龙 尹 达 申文琦 李 磊 罗 跃 梁红军

WANG Zhilong YIN Da SHEN Wenqi LI Lei LUO Yue LIANG Hongjun

为了揭示盐水对有机盐钻井液性能的影响规律与作用机理， 调控和稳定复杂条件下有机盐钻井液的性能，研究了盐水侵污对塔里木油田库区块钻井用有机盐钻井液流变性能和沉降稳定性的影响， 分析了盐水侵污机理。结果表明： 盐水对现场有机盐钻井液体系的主要作用是稀释， 稀释作用导致黏度、 切力大幅度下降， 泥饼明显增厚， 沉降稳定性变差。在 40%盐水侵污时， 表观黏度由 103 mPa·s降至 18.5 mPa·s； 中压失水量、 高温高压失水量分别由 1 mL、 7 mL增至 2.7 mL、 28.1 mL； 中压、 高温高压下的滤饼厚度分别由 0.5 mm、 2 mm增加至 1 mm、 7mm； 钻井液的密度差由 20℃、 150℃条件的 0 g/cm3、 0.18 g/cm3增至 0.08 g/cm3、 0.32 g/cm3。由盐水侵污引起的有机盐钻井液性能的变化无疑会增加井下复杂情况发生的频率。表4参10

In order to discover the effect and action mechanism of salt water on performance of organic salt drilling fluid（OSDF)，and to regulate and stabilize the performance of the OSDF, indoor experiments were made to test the influence of salt water intrusion on the performance and stability of OSDF，and the mechanism of salt water intrusion was analyzed. The results showed that the main effect of salt water on the OSDF system was dilution ，which leaded to a decrease in viscosity and shear stress greatly，mud cake thickening and poor settlement stability. when the 40% salt water intrusion，apparent viscosity decreased from 103 mPa·s to 18.5 mPa·s， API and HTHP filitration increased from 1 mL to 2.7 mL and 7 mL to 28.1 mL，respectively；The filter cake thickness of API and HTHP increased from 2 mm and 0.5 mm to 1 mm and 7 mm，respectively；the density difference of the drilling fluid at the temperature of 20℃ and 150℃ increased from 0 g/cm3 and 0.18 g/cm3 to 0.08 g/cm3 and 0.32 g/cm3，respectively. These changes would undoubtedly increase the frequency of underground complex situation.

10.19346/j.cnki.1000-4092.2016.04.001