中高温清洁压裂液在卫11-53井应用研究

CLEAN FRACTURE FLUID FOR MEDIUM-HIGH TEMPERATURE APPLICATION ON WELL WEI [STH4]11-53

对适用井温80~120℃的中高温清洁压裂液体系进行了室内实验研究和现场施工技术研究,并成功地进行了现场施工。该体系在80~120℃温度区间具有较高的黏度,其流变性仅受温度的影响,对剪切历程不敏感。与水或油接触可自动破胶,不需要额外的破胶剂。该体系在卫11-53井应用获得成功,是国内第1口中高温清洁压裂液现场施工井。卫11-53井成功施工说明中高温清洁压裂液已达现场应用的水平。对实验井采用合压的施工方式,用120m3清洁压裂液加0.09~0.25mm陶粒3m3、0.45~0.90mm陶粒9.4m3,平均砂比21%。在排量为4.71m3/min时,施工摩阻仅3.6MPa/km。压裂施工顺利,压后效果较好,说明该体系摩阻低,携砂能力强,对地层伤害小。

Lab study and field trial use have been conducted for a clean fracture fluid system developed for service under wells bottom hole temperature between 80-120℃. The system shows relatively high viscosity under temperature between 80-120℃. Its rheological behaviour is affected only by temperature and is not sensitive to shear process. It breaks automatically when contacting water or oil without adding breaking agent. The system was successfully used on Well Wei 11-53, which marked the first time in China gas well is simulated with medium-high clean fracture fluid and proved the applicability of the fluid. During field operation, 120m^3 clean fracture fluid was mixed with ceramic granular (3m^3 of 0.09-0.25mm and 3m^3 of 0.45-0.90mm) and pumped down the well together. Average proppant concentration was 21%. At the discharge volume of 4.71 m^3/min, friction drag was only 3.6 MPa/km. Smooth operation and excellent postfrac effects have been observed, which demonstrate clearly low friction loss, strong proppant transportation, and low formation-damaging properties of the system.