涪陵页岩气田深层气井酸处理技术研究

Discussion on Acid Treatment Technology of Deep Well Fracturing in Fuling Shale Gas Field

涪陵页岩气田进入二期产建阶段,页岩气井埋深增加,压裂改造难度增大,尤其是在设备限压仅为93 MPa的前提下,深井施工压力高,酸降效果不明显,严重限制了后期各项改造措施的执行。通过分析深层页岩气井酸降效果降低的主要原因,并在此基础上通过室内及现场试验研究了影响酸处理效果的主要因素,试验表明:提高酸处理排量、增加酸液浓度、合理优化酸液用量将有助于提高酸处理效果,为涪陵页岩气田深层页岩气井后续的压裂施工提出了优化建议。

In the second production phase of Fuling shale gas field, the difficulties in fracturing treatment came along with the increasing buried depth, especially under the condition of only 93MPa limited pressure for equipments, acid reducing effect was not obvious in high pressure in deep well construction, which severely restricted the implementation of the later fracturing measures. By the analysis on the main causes of unsatisfactory acid reducing effect, tile main factors affecting the acid treatment effect are studied through indoor and field tests on this basis. The tests show that the increase of acid treat- ment displacement, the increase of acid concentration and reasonable optimizing the amount of acid are helpful to improve the acid treatment effect. The optimization suggestions are put forward, which has important significance to the later fractu- ring construction of deep shale gas well in Fuling shale gas field.