暂堵酸化试验研究

Experimental Study of Temporary Plugging Acidization

本文提供了一种暂堵剂酸化试验研究方法。对暂堵剂的油溶性、粒度分布及在酸液中的稳定性和暂堵剂与酸液的配伍性进行了试验分析，采用特殊设计的暂堵酸化试验仪器，分别研究了暂堵剂对岩芯的暂堵效率，在产出液中解堵效率，及不同渗透率岩芯的暂堵分流效率．模拟实际酸化过程的注酸顺序，进行了暂堵酸化试验研究。结果表明，采用ＤＺ－１暂堵齐，其油溶性好，在酸液中表现为惰性，与酸液及添加剂配伍性好，并联岩芯酸化时能有效地暂堵分流，使低渗透岩芯吸酸量增大，均匀改善了各不同渗透性岩芯的最终渗透率，提高了酸化效果。结果分析表明，采用暂堵剂酸化技术可有效地解决渗透率差异较大的多层油藏均匀吸酸，均匀解堵问题，而无需进行其它分层措施，是一项值得推广的砂岩酸化新技术。

This paper presents an experimental study method of temporary plugging acidization,and gives an experimental analysis of the oil-solubility, particle destribution of the temporary plugging agent, and its stability in acid fluid and the compatibility of temporary plugging agent with acid fluid. Using a specially designed temporary plugging acidizing experimental apparatus, the paper respectively studies the temporary plugging efficienccy of the temporary plugging agent, the unplugging efficiency in produced fluid, and the temporary plugging diverting efficiency of the cores of different permeabilities. In this paper, we model the acid injection sequence of the actual acidizing process, and make a temporary plugging acidizing experiment. The results show that DZ-1 temporary plugging agent displays excellent oil -solubility, inertia in acid fluid. amd good compatibility with acid and additives. In a paralle core acidizing experiment, it can effectively divert the flow rate through each core and greatly increases the acid absorption amount of the cores of low permeabilities, thus evenly improving the permeabilities of different cores and the acidizing effect. Through the results, we can also see, using the temporary plugging acidizing technique, we can effectively solve the problems of even absorption of acid fluid and even unplugging of multiple reservoirs of different permeabilities, No layering measures are meeded.So it is a new technique of sandstone acidization which is worth popularizing.