有机解堵剂和非酸解堵体系性能评价与现场应用

Performance Evaluation and Application of Organic Plug Removal Agent and Non-acid Plug Removal System

肖立晓 侯吉瑞 李 婕；张 宁 张九然；梁 拓 赵 伟

XIAO Lixiao HOU Jirui LI Jie ZHANG Ning ZHANG Jiuran LIANG Tuo ZHAO Wei

稠油油藏黏度高，流动性差，开发过程中极易在近井地带形成有机垢沉淀和无机固相堵塞，降低近井地带渗透率，导致地层产量急剧下降。针对渤中油田明化镇组D11和D34-H油井特殊的油藏物性和堵塞类型，通过沥青溶蚀、溶蜡和降黏实验等筛选出TC-4有机解堵剂，通过溶蚀碳酸钙、溶蚀黏土和岩心流动实验等评价DH-1非酸解堵体系的性能，并将其用于矿场试验。结果表明，TC-4有机解堵剂对沥青和石蜡的溶蚀能力及降黏效果较好，对储层的伤害小，适于解除有机堵塞；DH-1非酸解堵体系具有良好的缓速、缓蚀和溶垢能力，对岩石骨架不会造成严重的破坏，与原油的配伍性好，在运移过程中能及时破乳，适于解除无机固相堵塞。在D11井使用TC-4有机解堵剂、在D34-H井用TC-4有机解堵剂进行有机清洗和DH-1非酸解堵体系相结合的方法进行解堵，两井的日产油量、日产液量和含水率基本恢复至解堵前水平。两种解堵体系均能较好地解除稠油油藏堵塞问题。

Due to high viscosity and poor fluidity of heavy oil reservoir，it is easy to form organic scale deposition and inorganic solid phase plugging in the near well zone，reducing the permeability of the near well zone and leading to a sharp decline in formation production during the development of oilfield. According to the special reservoir physical properties and plugging types of D11 well and D34-H well in Minghuazhen formation of Bozhong oilfield，TC-4 organic plug removal agent was selected through asphalt dissolution，wax dissolution and viscosity reduction experiments，and the performance of DH-1 non-acid plug removal system was evaluated by the experiments of calcium carbonate dissolution，clay dissolution and core flow. Finally，these two plug removal systems were applied on site. The results showed that TC-4 organic plug removal agent had good dissolution ability on asphalt and paraffin，good viscosity reducing effect，and little damage to reservoir，which was suitable to remove organic plugging. DH-1 non-acid plug removal system had a good retarding speed，corrosion inhibition and scale dissolution ability，which would not cause serious damage to rock skeleton. It had good compatibility with crude oil，and broke emulsion in time during migration， which was suitable to remove inorganic solid phase plugging. After TC-4 organic plug removal agent was used in D11 well，and the combination of organic cleaning with TC-4 organic plug removal agent and DH-1 non-acid plug removal was used in D34-H well， the daily oil production，daily liquid production and the rate of water content of these two wells basically returned to the level before plugging removal. Both of the plugging removal system could solve the plugging problem in heavy oil reservoir.