Research and evaluation on a new foam isolation liquid system
Due to the limitation of deep well structure and underwater wellhead system,with the formation fluid production,due to the heat transfer of the fluid,the fluid temperature in the closed loop is increased,and the phenomenon of the pressure in the closed loop of the casing ring is increased(APB).For this purpose,a foam isolation liquid system was con-structed with the formula,water+nitrogen+1％ suspension agent S30S+0.8％ foaming agent AOS+0.2％ OP-10+0.4％ foam stabilizer VIS+40％ ultrafine iron ore powder.The foam isola-tion liquid has good rheology and stability at different temperatures.At a certain tempera-ture,the foam has good stability and can fully meet the retention rate of nitrogen during construction.Compared with water,when the temperature rises to 130℃,the pressure of foam isolated liquid decreases by 95.1％,and at the initial pressure of 20.0 MPa,the pres-sure can also decrease by 82.5％,which has good elasticity and can effectively relieve the annular pressure.
deep water wellannular pressurefoam isolation liquid
万方数据
维普
