具防砂功能的蒸汽吞吐稠油井改性硅酸盐蒸汽转向剂

Modified Silicate Steam Diversion Agent for Use in Sanding Steam Huff-Puff Wells

报道了针对易发生蒸汽窜、后期出砂严重的孤东稠油油藏蒸汽吞井研制的一种蒸汽转向剂。该剂基料为表面经10%金属氧化物、5%有机硅改性的G级油井水泥,增渗剂为质量比8:0.05:1:1.5的石油树脂+铝粉+苯甲酸+直径0.1～0.3mm、长5～10mm的植物秸杆纤维,用量为基料的60%,用清水配浆,最佳工艺条件如下:水灰比0.6,固化温度60℃,固化时间72小时。固结体油相(煤油)渗透率为0.01219μm2,抗压强度6.43MPa,经300℃高温蒸汽和60℃煤油处理后渗透率>1.0μm2,抗压强度5MPa。注入并联填砂管并固化后,高、低渗填砂管的吸汽能力之比由2.4:1变为1:1.9。在两口蒸汽吞吐井使用该蒸汽转向剂,注入量分别为8和10m3,效果良好。

The steam diversion agent（SDA） presented was developed for use in steam huff-puff heavy oil wells in Gudong with steam breakthrough occured in pay layers and sanding problems encountered in the later stage of a production cycle. The basic material of the SDA was a grade G oilwell cement,the surfaces of which were modified by 10% metal oxides and 5 % silicone;a mixture of petroleum resin ＋ powdered Al ＋ benzoic acid ＋ plant fiber 0. 1---4）. 3 mm in diameter and 5--10 mm long in mass ratios of 8： 0. 05：1 ： 1.5 was taken as permeability enhancing agent at dosage 60% of mass of the basic material. The working fluid was prepared in fresh water. The optimized parameters were： water to modified cement ratio 0. 6; curing temperature 60℃; and curing time 72 hrs. The cured compounded modified cement had permeability to oil phase, kersene,0. 01219 μm^2 and compression strength 6.43 MPa and the two characteristics changed to 〉 1.0/μm^2 and - 5 MPa after treating by steam at 300℃ and kerosene at 60℃. For a set of sand packed tubes in paralell treated by this SDA ,the proportion of steam intake of high and low permeability sand packed tubes was dropped from 2. 4：1 to 1： I. 9. This SDA was successfully used in two steam huff-puff wells with 8 and 10 m^3 of working fluid injected per well.