Abstract: Based on the study of the material dissolution mechanism,it was clear that uniform solubility and controllable solubility were the key properties of soluble materials.Dissolvable magnesium and aluminum metal material were designed. The test results of the sample show that the designed dissolution rate of a dissolvable materials is 0.184 g/h under the conditions of 1% Cl- mass fraction of the solution and a temperature of 90 ℃. The advantages and disadvantages of bridge plug structure design at home and abroad were compared, based on the concept of dissolution difference and the objective of optimizing pressure bearing, anchoring and dissolution performance, a new dissolvable bridge plug, which meet the fracturing demand of Liaohe Oilfield, was developed. The results of indoor evaluation tests show that, the fracturing ball can be dissolved in 30.0 hours under the conditions of 1% Cl- mass fraction of the solution and a temperature of 90 ℃;the maximum working pressure of the dissolvable bridge plug is 70.0 MPa, the effective sealing time is more than 12.0 hours, and the dissolution time is 16.0 days. The field test was carried out with the developed dissolvable bridge plug. During the field test, the setting and releasing operation was successful, and the soluble ball was obviously in place. The bridge plug has been dissolved after 18.0 days of spraying. The successful development of dissolvable bridge plug will provide important supports for the large⁃scale volume fracturing technology in Liaohe Oilfield.

Key words: Dissolvable bridge plug, Dissolvable fracturing ball, Staged fracturing, Performance test, Field test

摘要： 在研究材料溶解机理的基础上，明确了均匀溶解性和可控溶解性为可溶材料的关键性能，设计了可溶镁铝金属材料。试样测试结果表明，在溶液Cl－质量分数为1%、温度为90 ℃的条件下，设计的可溶材料的平均溶解速度为0.184 g/h。在对比国内外桥塞结构设计优缺点的基础上，结合辽河油田压裂需求，基于溶解差异性理念和最优化承压、锚定、溶解性能目标，研制了新型可溶桥塞。室内评价试验结果表明，在溶液Cl－质量分数为1%、温度为90 ℃的条件下，可溶球在30.0 h内溶解完毕；可溶桥塞最高工作压力为70.0 MPa，有效密封时间大于12.0 h，完全溶解时间为16.0 d。应用研制的可溶桥塞开展了现场试验，坐封丢手作业顺利，可溶球到位显示明显，放喷18.0 d后回探桥塞已溶解。可溶桥塞的成功研制，可为辽河油田大规模体积压裂提供重要的技术支持。

关键词: 可溶桥塞, 可溶压裂球, 分段压裂, 性能试验, 现场试验