The copolymer also had good heat resistance salt tolerance, and hole sloughing prevention.
抗高温、抗盐尤其抗高价离子污染能力强，防塌效果好。
Field applications show that this technique can effectively prevent coal beds sloughing and decrease hole problems and drilling accidents.
现场应用表明，该技术能有效地防止煤层坍塌，减少井下复杂情况及事故。
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