压裂技术在东海低渗气田开发中的应用

Application of Fracturing Technology to the Development of the Low Permeability Gas Reservoir in East China Sea

随着开采工艺技术的进步、油价一直在高位运行,那些埋藏在东海海域过去被认为开发无经济效益的所谓"差气层、干层或致密层"进入了开发工作者的视野。通过对东海T气田A5井始新统平湖组低渗气藏进行压裂开发试验,取得了预期的效果,单井产量大幅提高,证明压裂可以成为有效动用低渗天然气储量的有效措施,是提高东海天然气储量动用率和采收率的有效途径。同时,也表明对东海低渗气层的认识应予以调整,重新确定气层判别标准。

With the progress of recovery technology and the rising in oil price, ＂the poor gas layers＂, ＂the dry layers＂, or ＂the tight layers＂, which are considered as uneconomical for development in the East China Sea have become the study focus for geologists and reservoir engineers. The fracturing testing has been undertaken successfully in well A5 at low permeability Eocene Pinghu Forma- tion in T Gas Field, East China Sea, and good fracturing results have been obtained, resulting in obvious improvement in the output in individual well. It has been proved that fracturing technology is effective measure to produce gas reserves in low permeability, gas reservoirs and to enhance gas recovery. It also illustrates that the understanding about the low permeability gas layers in East China Sea should be adjusted and the standards to identifiy gas layers should be redefined.