高温高压硅氧烷型泡排剂DK-3的研制与性能评价

Silicone foam remover for deep layer high temperature and high pressure

针对Y气田目标区高温(140℃)、高压(30 MPa)、携液能力低等制约泡排实施的问题,利用硅氧烷型表面活性剂、脂肪族甜菜碱、月桂基葡萄糖苷三者的协同作用,研制了一种适合Y气田深层高温高压条件下的三元复配硅氧烷型泡排剂DK-3,并对其在高温高压下的发泡能力、稳泡能力进行评价。结果表明:随着压力的增大,泡沫稳定性显著提高,在140℃、30 MPa条件下的泡沫半衰期较常温常压增幅为138.10%,且在压力高于30 MPa后,泡沫稳定性增幅较小;随着温度的增加,泡沫半衰期总体降低12.10%,泡沫稳定性降低;压力、温度对泡沫的发泡能力影响较小。携液实验结果表明,在140℃条件下老化24 h后,5 mL泡排剂溶液的携液时间为415 s,与常规泡排剂相比,携液时间较短,泡沫稳定性好,理论上适用于Y气田深层低产液气井排水需求。

Based on the fact that the liquid carrying capacity of the string of deep low liquid production wells in Y gas field is gradually decreasing,the high temperature(140℃)and high pressure(30 MPa)in the target area restrict the implementation of deep high temperature foam drainage,and the conventional foam drainage agent can not meet the characteristics of high temperature and high pressure in Y gas field.Therefore,a ternary compound silicone foaming drainage agent system suitable for deep high temperature and high pressure in Y gas field was developed by using the synergistic effect of silicone foaming agent DK-3,aliphatic betaine and lauryl glucoside.The foam capacity and foam stabilizing ability of the foaming agent under high temperature and high pressure were evaluated.The results show that the discrete curvature increases significantly with the increase of pressure.The foam half-life at 140℃and 30 MPa increases by 138.10%compared with room temperature and atmospheric pressure.When the pressure was higher than 30 MPa,the foam stability increases little.However,with the increase of temperature,the half-life of foam decreases by 12.10%and the foam stability is reduced.Pressure and temperature have little effect on foaming capacity of foam.The results of liquid carrying experiments show that the liquid carrying time of 5 mL foam solution was 415 s after aging 24 hours at 140℃.Compared with conventional foam drainage agent,the liquid carrying time was shorter and the foam stability was better.It is theoretically applicable to the drainage demand of deep low production liquid gas well in Y gas field.