边底水油藏水平井复合堵水技术研究与应用

DEVELOPMENT AND APPLICATION OF COMPOUND WATER PLUGGING TECHNOLOGY FOR HORIZONTAL WELLS WITH EDGE AND BOTTOM WATER

桩西地区边底水油藏水平井含水上升快、产液量高,传统堵水效果差,为此开展了复合堵水技术研究。设计合成了一种微观油水调控剂,研发了耐温高强度堵剂,评价了解堵剂的解堵性能。实验结果表明,微观油水调控剂具有良好的驱油性能;耐温高强度堵剂本体强度可达2 722. 4 N,耐温120℃,耐盐100 000 mg/L。以桩1-平71井为例,优化了堵水工艺参数。目前,在水平井实施复合堵水5井次,堵水有效率100%,平均单井日增油2. 8 t,日产液降低125 t。现场应用结果表明,复合堵水工艺可实现对水平井的封堵,达到降液增油的目的,具有较高的推广应用价值。

At Zhuangxi area, the horizontal wells in edge-bottom water contained reservoir are characterized by rapid water increase, high liquid production and poor water plugging effects by conventional methods.A series of study was carried out to develop compound water plugging technology.A micro oil-water regulator has been synthesized, a high temperature high strength plugging agent developed, and the plugging removal performance of the plugging removing agent has been evaluated.Experimental results show that micro oil-water regulator has good oil driving performance.The plugging agent has a strength 2 722.4 N, working temperature 120℃, and salt tolerance 100 000 mg/L.As in Case Zhuang1-ping71, the water plugging parameters are optimized.5 tests of compound water plugging in horizontal wells have been carried out, and the success rate is 100 %.The average daily oil production of single well is increased by 2.8 t, and the daily liquid output is reduced by 125 t.The field application results show that the compound water plugging technology can realize the purpose of water plugging in horizontal wells,achieve the goal of oil production increase, having a good prospect of promotion.