Foam Drainage Reconciliation Of The Sichuan Gas Field Blocking Agent And Applied Technology Research

Surface active agent is applied widely in oil and gas engineer on the basis of literatures. For chemical treating agents, a most significant direction in studying and development is to synthesize every kind of existed surface active agents and to research modifiedly in order to enlarge its application in oil and gas engineer. This paper explores the surface active agent more extensively during the middle or later developing period in water-bearing gas fields in Sichuan Basin.The influence of temperature and formation water mineralization on the surface active agent is studied. A reason for the reaction of the agent with other agents under high temperature is discussed. A qualified amphoteric ionic surface active agent is achieved in a lab through an organic synthetic reaction. An appropriate drag-reduction agent and the synthetic amphoteric ionic surface active agent are chosen to refit. The refitted foam discharge agent is comprehensively evaluated in foamability, forn stability, water-carried capacity, thermal stability and buffering erosion capacity. Meanwhile, a mechanism of encrusting in bottom hole is analyzed according to the requirements from fields, and an anti-plugged acid bar for contaminating release, accessed experimentally, is developed. The bar and the foam agent form a complete set of foam drainage gas recovery steps.Achieved in the lab, the amphoteric ionic surface active agent and the anti-plugged acid bar are in test production. The synthetic production, which has achieved better result, is tested in Carboniferious Gas Field in East Sichuan and Zhongba Gas Field in North-west Sichuan.