桐47区块复合压裂工艺

Technology of compound fracturing in Tong47 block

桐47区块前期压裂未达到预期增产目的,为此针对储层强水敏的地质特性优选了胍胶+清洁压裂液复合压裂工艺。胍胶具有较好的耐温、造缝能力;清洁压裂液具有低污染、很强的抑制黏土膨胀能力、较强的携砂能力。在高温、水敏地层中将清洁压裂液和胍胶压裂液的优点完美组合起来,达到很好的增产效果。进行了体系性能室内试验和现场施工参数、裂缝几何形态的优选试验,施工成功率达到100%,压后均自喷,取得了很好的增产效果。

The yield aim expected is not achieved in prophase fracturing of Tong47 block.Therefore,in allusion to geological properties of strong water sensitivity of reservoir,compound fracturing technology of guanidine gum and clean fracturing fluid is selected preferentially.Guanidine gum has better ability of temperature resistance and forming fissure.And clean fracturing fluid is of low pollution,strong clay expansion inhibition ability and relatively strong sand-carrying ability.In reservoir of high temperature and water sensitivity,the advantages of clean fracturing fluid and guanidine gum fracturing fluid are combined perfectly,which achieves good yield effect.Indoor experiment of system property and optimal selection experiment of field construction parameters and fracture geometric form having good yield effect are done,where construction success rate reaches 100%,that is,all wells achieves self flowing after stress.