用于蒸汽吞吐井的热沉积无机凝胶堵水技术  

Profile Modification/Water Shutoff in Cyclic Steam Stimulation Wells by Using Inorganic Thermally Precipitating Gelling Fluid

作　　者：马春宝[1] 

机构地区：[1]中国石油辽河油田分公司锦州采油厂,辽宁凌海121209

出　　处：《油田化学》2010年第1期52-54,共3页Oilfield Chemistry

摘　　要：所报道的热沉积无机凝胶堵剂,又称地层涂层堵剂,由A、B两液混合而成,黏度25mPa.s,pH=9,含有轻悬浮无机颗粒与有机添加剂,固体物含量31.0mg/L,在40℃以上可生成固化物,其耐温性达400℃。pH为9和12时固体物含量相同,pH为2时固体物含量减少。在人造砂岩岩心中注入该堵剂,在90℃反应4小时后测40分钟驱出液体积,结果表明在含油饱和度相同(2%,20%)的堵塞岩心中,水、油的流动阻力相同,水、油在低(2%)含油饱和度堵塞岩心中的流动阻力大大高于在高(20%)含油饱和度堵塞岩心中的流动阻力。堵塞岩心经100PV水或油驱替后,渗透率增加幅度很小。该堵剂固化时间约8小时。矿场施工中处理半径一般为1.5～2.0m。堵水作业中堵剂从套管挤入,调剖作业中堵剂从注汽油管挤入。2008年在辽河锦45、锦25块蒸汽吞吐井用该堵剂实施堵水作业16井次,调剖作业18井次,增油减水效果显著。The inorganic thermally precipitating gelling fluid（ITPGF） presented in this paper,so called reservoir coating sealing agent,was a mixture of constituent solutions A and B in equal volume ratio,which had viscosity 25 mPa·s and pH value 9,contained light suspended solid particles and organic additive（s） with solid content 31.0 mg/L and became solidified at temperatures 40℃,being resistant to high temperature 400℃. The solid content was similar at pH=9 and 12 and lessened at pH=2. The ITPGF was injected into artificial sandstone cores and gelled within the cores at 90℃ in 4 hrs and these plugged cores were flooded by water or oil over 40 min;it was shown that the pluggings in cores with similar residual oil saturation（ROS）,2% or 20%,exerted similar resistance to water or oil flow through the cores while the resistance was much more higher in low ROS,2%,cores than that in higher ROS,20%,cores. The permeability of the plugged cores of ROS=2% reduced slightly after the cores being flooded by 100 PV water or oil. The ITPGF solidified in about 8 hrs. The treating radius was commonly in range 1.5—2.0 m for field jobs. The ITPGF was squeezed into aimed wells through casing for water shutoff and through steam injecting tube for injectivity profile modification. In 2008,16 water shutoff jobs and 18 profile modification jobs were conducted with this ITPGF in steam huff-puff wells at Jin-45 and Jin-25 block reservoirs in Liaohe and resulted in increased oil output and lowered water production.

关 键 词：调剖堵水剂 无机凝胶 热沉积 蒸汽吞吐井 堵水 调剖 施工工艺 辽河锦州采油厂 

分 类 号：TE358.3[石油与天然气工程—油气田开发工程] TE39