速溶海水基压裂液在渤海油田的应用

Application of Instant Dissolved Seawater Based Fracturing Fluids in Bohai Oilfield

针对渤海L油田的高孔、高渗、疏松砂岩储层特点,开发了一套速溶海水基压裂液,进行了速溶性、耐温耐剪切性、滤失性、破胶性能和岩心伤害性能评价。实验结果表明:SWF-SRG在海水中溶胀5min溶解率达到92.3%,满足连续混配配液的要求;形成的速溶海水基压裂液在储层温度下剪切120 min后黏度大于50mPa·s,满足现场压裂施工携砂的要求;该压裂液具有较高的造壁滤失系数、易破胶、储层伤害率低的优点,适合海上疏松砂岩压裂。速溶海水基压裂液连续混配压裂在L油田成功应用,最大配液速度达4.3 m^(3)/min,最高砂比60%,最大加砂量51.1 m^(3),施工成功率100%,大幅提高了海上压裂施工效率。为海上大规模压裂提供了技术支撑。

Aiming at the characteristics of high porosity,high permeability and loose sandstone reservoirs in L Oilfield of Bohai,a set of instant dissolved seawater based fracturing fluids have been developed,and the properties of quick solubility,temperature resistance,shear resistance,leak off,gel breaking and core damage were evaluated.The experiment result shows that the percentage of dissolution reached 92.3% when SWF-SRG dissolved and swelled in seawater for 5 minutes,which meets the requirements of continuous mixing in fluid preparation;after shearing for 120 minutes at the reservoir temperature,the viscosity of the instant dissolved seawater based fracturing fluid is greater than 50 mPa·s,which meets the requirements of carrying sand in site fracturing operation;the fracturing fluid has the advantages of high wall filtration coefficient,easy gel breaking and low reservoir damage,which is suitable for offshore loose sandstone fracturing.The continuous mixed fracturing of the dissolved seawater based fracturing fluid has been successfully applied in L Oilfield,the maximum mixing speed of 43 m^(3)/min,the maximum sand ratio of 60%,the maximum sand addition of 51.1 m^(3),achieved the construction success rate of 100%,which greatly improves the efficiency of offshore fracturing operation,and provides technical support for large-scale offshore fracturing.