大位移井完井液润滑剂性能评价*

Performance of Drag Reducer for Completion Fluid of Extended Reach Well

江 华 杨 洋 由福昌 杜佳琪 邓 聪

JIANG Hua YANG Yang YOU Fuchang DU Jiaqi DENG Cong

大位移井由于水平位移长、井斜角大、地层压力系数高、完井时摩阻扭矩高，影响管柱下入。为解决这一问 题，室内研发了一种完井液润滑剂CR301，研究了加有该润滑剂的KCl盐水完井液体系的降摩减阻性、抗磨能 力、配伍性、对储层保护效果及水锁效应。结果表明，当CR301加量为2%时，KCl盐水完井液的摩阻系数由空白 的0.078降至0.046，摩阻系数降低率可达40%以上，抗磨能力由4块砝码卡停提高至10块砝码卡停。同时润滑 剂CR301与KCl盐水完井液具有很好的配伍性，可以提高岩心的渗透率恢复值，降低完井液体系的表面张力，降 低储层伤害。润滑剂CR301可明显提高KCl盐水完井液体系的降摩减阻性，且对储层有保护效果，可在大位移 井完井液中使用。表6参15

Due to long horizontal displacement，large deviation angle，high formation pressure coefficient and high friction torque during completion，the running of string is affected. In order to solve this problem，a kind of completion fluid lubricant CR301 was developed in laboratory，and the friction reducing and drag reducing performance，anti-friction ability，compatibility，reservoir protection effect and water locking effect of KCl brine completion fluid system with the lubricant were studied. The results showed that when the dosage of CR301 was 2%，the friction coefficient of KCl brine completion fluid decreased from 0.078 to 0.046，the friction coefficient decreased by more than 40%，and the anti-friction ability increased from 4 weights to 10 weights. At the same time，CR301 had good compatibility with KCl brine completion fluid，which could improve the permeability recovery value of core，reduce the surface tension of completion fluid system and reduce reservoir damage. CR301 could obviously improve the drag reduction performance of KCl brine completion fluid system，and had protective effect on reservoir，so it could be used in extended reach well completion fluid.

10.19346/j.cnki.1000-4092.2021.03.004