高渗透地层选择性堵水剂JTD的研制与应用

Preparation and Application of Selective Water Shutoff Agent JTD for High Permeability Reservoir Formations

研制了一种组成复杂、作用原理多样的有机无机复合堵剂JDT ,其主要组成份如下 :2 0 %— 4 0 %油溶性聚合物 ;1 0 %— 2 0 %油溶性芳烃树脂 ;0 %— 2 0 %油溶性纤维 (长度≤ 1 0mm) ;0 %— 2 0 %橡胶粉 ;1 0 %— 3 0 %粉状无机填料 ;0 %— 2 0 %酸溶性纤维 (长度≤ 1 0mm) ;1 %— 5%水溶性聚合物 ;1 %— 3 %聚合物交联剂 ;1 %— 2 %表面活性剂。使用时配制成 5%— 2 0 %的水悬浮液 ,注入地层后在地层温度下可固化。讨论了每一种组成分的作用及JTD堵水原理。在室内测试了JTD的各项基本性能 :油溶性 64 % (煤油 ,70— 80℃ ) ;酸溶性 2 6% ( 1 0 %盐酸 ,70— 80℃ ) ;成胶时间从 4 5— 50小时 ( 50℃ )到 1— 3小时 ( 1 2 0℃ ) ,常温下可稳定存在约 7天。岩心实验表明 ,岩心渗透率越高 ,则JTD的封堵效率越高 ;堵剂悬浮液浓度及挤入量越大 ,封堵效率也越高 ;JTD的堵油、堵水选择性好 ,堵水率在 98%以上 ,堵油率小于 1 5% ;在岩心中固化后的JTD极耐水冲刷 ,水驱 50 0PV后的堵水率仅由 99.82 %下降到98.52 %。 1 997.7— 1 999.1 2在中原、克拉玛依、塔里木等油田用JTD实施油井堵水 58井次 ,工艺成功率 1 0 0 % ,有效率 >90 %。以克拉玛依油田一口油井为例 ,说明了堵水情况及效果。

A combinational organic/inorganic water shutoff agent, JTD, of complicated composition and multiple functioning mechanisms is prepared. It consists of mainly of 20%-40% oil soluble polymer, 10-20% oil soluble aromatic resin, 0-20% oil soluble fibers of length ≤10 mm, 0-20% powdered rubber, 10-30% powdered inorganic filler, 0-20% acid soluble fiber of length≤10 mm, 1-5% water soluble polymer, 1-3% polymer crosslinker, and 1-2% surfactant. JTD in 5-20% aqueous suspension forms gel like mass at reservoir temperatures. The function of every component of JTD and the multiple mechanisms involved in the blockage formation are presented. The basic properties of JTD are determined: solubility at 70-80℃ in kerosene 64% and in 10% HCl 26%; gelation time of suspensions from 45-50 hrs at 50℃ to 1-3 hrs at 120℃,stability at room temperatures ～7 days. In core flow experiments it is shown that the higher the core permeability the higher the water plugging rate of JTD is; the higher plugging rates are observed when the suspension is more concentrated and the volume of injected JTD is larger; JTD is highly selective and its plugging rates for water and oil are of >98% and <15%, respectively; the gelled JTD is resistant to water flush up to 500 PV. The water shutoff operations in 58 oil wells with JTD at Zhongyuan, Karamay and Tarim in 1997.7-1999.12 are performed with technologic successfulness of 100% and effectiveness >90%. The water shutoff and the results obtained are presented for a well historical case of Karamay.