塔河油田TK305井井筒沥青质沉积防治

Asphaletene Deposition Prevention and Treatment Using Dispersant/Stabilizer in Production Well TK305 of Tahe Oilfield

塔河油田奥陶系油藏（地温126℃）多口采油井井筒出现沥青质沉积，其中TK305井多次处理无效而停产，连续注入掺沥青分散稳定剂SLAD-02（主要成分为大分子含氟表面活性剂）的原油，使该井恢复生产。TK305井沥青质沉积物含沥青质60．19％，含胶质7．64％，85℃时不流动，95℃时较易流动，在120℃不溶于性质与TK305井原油相近的S86井原油（稀油），在塔一联原油（稠油）中溶解率为4.8％，在加入0．4％SLAD-02的塔一联原油中溶解率达30．13％，混入高达50％的模拟地层水基本上不影响加剂塔一联原油对沥青质沉积物的溶解率。溶解了沥青质沉积物的加剂塔一联原油与S86井原油的等量混合油，30~60℃黏度在50～350mPa·s之间，在井筒内可正常举升。TK305井井筒沉积沥青质沉积物4800m，用SLAD-02处理解堵后，2005年8月13日～10月6日期间通过环空注入加剂塔一联原油，根据产出油黏度调整加剂原油注入量和地层产油量，10月1日～6日期间进行评价．累计注入加剂原油550．2m^3，累计地层产油399．9m^3，注采比1：0．73，该并恢复了生产。图4表4参5。

Severe borehole asphaltene deposition appears in a lot of production wells of Ordovician reservoirs of temperature 126℃ in Tahe and well TK.305 is shut in after several remediation treatments failured. By continuously injecting crude oil with an asphahene dispersant/stabilizer, SLAD-02, which is composed of macromolecular fluorocontaining surfactant as main component, the oil output from TK305 is restarted. The asphaltene deposits （ADs） in borehole of TK305 contain 60.19 % asphaltene and 7.64 % resin, do not flow at 85℃ and flow readily at 95℃. The solubility of ADs at 120℃ is 0% in crude oil of well S86, similar to TK305 crude oil in properties, is 4.8 % in Tahe heavy crude oil （THCO） of the 1st Tahe gathering/treating plant and is 30.13 % in THCO with 0.4 % SLAD-02 added; in the later ease the solubility is practically not enfluenced by introducing up to 50% sImulation formation water. The mixture of SLAD-02 treated THOD and S86 crude oil in equal quantities with ADs dissolved has viscosity at 30-60℃ in range 50-350 mPa＇ s and can be lifted in the borehole normally. After the ADs extended 4800 m in borehole of TK305 having been removed by treating with SLAD-02, THOD with SLAD-02 added is injected continuously through annulus into well TK305 from Aug 13, 2005 to Oct 6,2005 and the quantities of THCO injected and of the oil produced from the pay layers are controlled according to the viscosity of the mixed oil produced from the well. An appraisal shows that Oct 1-6,2005 ,totally 550.2 m^3 of SLAD-02 treated THOD has been injected and 399.9 m^3 of crude oil has been recovered from the pay layers of the well with injection-production ratio=1：0.73. This well has restarted oil output.