新疆油田七东区聚驱地面黏度保留率检测

Testing of viscosity retention rate of polymer flooding surface system in Qidong area of Xinjiang oilfield

新疆油田七东区克下组砾岩油藏聚合物驱地面系统采用集中配液、一泵多井工艺,划分为分散熟化、螺杆泵增压、粗细过滤、柱塞泵增压、母液流量调节、静态混合注入阶段,应用盘管式高压取样器提高黏度化验样品的代表性,用增加取样频次、浓度、黏度同时化验、进出口同步取样等方法降低黏度数据误差,分节点检测出地面系统分阶段的黏度保留率,用井口黏度与标样黏度之比代表地面配注系统黏度保留率,根据分阶段黏度保留率递进连乘的原理推导出静态混合注入阶段的黏度保留率,为系统优化调整提供了可靠的依据。通过降低母液调节压差、降低柱塞泵泵阀弹簧弹性、井口单流阀保持常开等方法使七东区黏度保留率达到国内先进水平。

The surface system of polymer flooding in conglomerate reservoir of Kexia formation in Qidong district of Xinjiang oilfield adopts the technology of centralized solution preparation,one pump with multiple wells,it can be divided into the stages of dispersion ripening,screw pump pressurization,coarse and fine filtration,plunger pump pressurization,mother liquor flow regulation,static mixed injection.It uses coil type high-pressure sampler to improve the representativeness of viscosity test samples,reduces the error of viscosity data by increasing sampling frequency,simultaneous testing of concentrated viscosity,synchronous sampling at the inlet and outlet,test the viscosity retention rate of the surface system in stages by nodes,and represents the viscosity retention rate of the surface injection system by the ratio of wellhead viscosity to standard sample viscosity.According to the principle of successive multiplication of viscosity retention in stages,the viscosity retention in static mixing injection stage is derived,which provides a reliable basis for system optimization and adjustment.The viscosity retention rate of Qidong district has reached the domestic advanced level by reducing the regulating differential pressure of mother liquor,reducing the spring elasticity of plunger pump valve and keeping the wellhead single flow valve normally open.