【摘要】 题示调堵剂由4.1%淀粉、4.1%AM、0.16%引发剂、0.04%交联剂组成,用吉林油田采出水(矿化度5.15 g/L)配制,30℃成胶时间17小时,成胶强度(通过面积28.3 cm2的两层20目筛网所需驱动压力)为0.85~0.95MPa,加入0.02%~0.20%缓聚剂可使成胶时间延至25~90小时。可用不同油藏采出水(矿化度4.47~263 g/L)配制,在各该油藏温度下(40~120℃)成胶。在30 m长40~60目含粘土约30%的露头砂填充管中注入9.5 m长调堵剂,沿程压力表明该调堵剂运移性能良好;入口处表观粘度计算值为0.05 Pa.s,8.16 m处下降至0.04 Pa.s;成胶后入口注水压力达60 MPa时,5.50 m及以下压力降至零。在2 m长、K=9.78μm2填砂管中以不同流量注入调堵剂,流出后的成胶率≥90%。在渗透率0.199~23.7μm2的4支1 m长填砂管注入0.3 PV调堵剂,成胶后注水突破压力梯度(7.8~8.4 MPa/m)、水驱至9 PV时的残余阻力系数(30~2850)及封堵率(96.7%~99.7%)均随原始渗透率增大而增大。0.3 m长2组高低渗填砂管并联,注入0.35 PV调堵剂时的分流率比与渗透率级差成正比,成胶后注水分流率发生反转。图3表5参6。更多还原

【Abstract】 The titled profiling/water plugging agent is composed of 4.1% starch,4.1% AM,0.16% polymerization initiator,and 0.04% crosslinker and prepared in Jilin produced water of TSD=5.15 g/L,it gelates at 30℃ in 17 hrs and the gel formed has strength of 0.85—0.95 MPa,which is measured as the driving pressure for the gel to flow through 2 layer screen of 20 mesh of area 28.3 cm~2.The gelling fluid(GF) prepared in produced waters of other main oil fields with TSD in range 4.47—263 g/L can form qualified gels at the corresponding reservoir temperatures,40—120℃.When the GF being injected into a long tubular sand pack of a 40—60 mesh outcropping oily sand containing ～30% clay minerals to 9.5 m length,the pressure values determined along show a smooth transfer of the GF in the porous medium,its apparent viscosity calculated is decreased from 0.05 Pa·s at the entrance to zero at 8.16 m distance and,when the fluid gelled,the water injection pressure is decreased from 60 MPa at the entrance to zero at 5.50 m distance.≥90% mass of the GF flown out from a 2 m long sand pack of K=9.78 μm~2 at different flowing rate is gellable.On four sand packs of 1 m long and of K in range 0.199—23.7 μm~2 with 0.3 PV of the GF injected and gelled,the breakthrough pressure of injected water(7.8—8.4 MPa/m) and the residual resistance factor(30—2850) and the plugging rate(96.7—99.7%) at 9 PV water injected are increased with increasing the initial permeability of the sand packs.Through 2 sets of high and low permeability sand packs 0.3 m long in parallel,the fractional flow rate ratio of the GF in 0.35 PV is proportional to the permeability variation coefficient and of the injected water is reversed after the GF injected and gelled..更多还原