注聚合物井解堵剂及工艺措施解堵效果
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中海石油天津分公司重点科技攻关项目“注水井超分子溶垢增注技术研究”(项目编号CCL2021TJLDNST1582)


Plugging Removal Effect of Plugging Agent and Supporting Measures in Polymer Injection Wells
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    摘要:

    渤海L、S和J油田经过长期注水注聚开发,储层的非均质性进一步增强,聚合物在储层内发生滞留,导致储层吸液能力大幅度下降,解堵是缓解当前情况的有效技术手段之一。为满足渤海化学驱解堵技术需求,评价了由解聚剂、酸和螯合剂组成的复和解堵剂和溶垢剂的解堵效果,探究了注入方式、注入压力和调剖措施对解堵效果的影响及作用机制。结果表明,将1.0%过硫酸铵与0.5%无机缓蚀剂组成解聚剂,当其质量分数为1.0%、段塞尺寸为0.05 PV时,聚合物堵塞岩心渗透率恢复率可达 90.31%,解聚效果较好。将0.54%柠檬酸与5.46%螯合剂组成溶垢剂,当其质量分数为6.0%和8.0%时,对3种无机垢堵塞岩心渗透率恢复率超过80%,溶垢效果较好。提高解堵剂注液速度可提升注入压力和改善解堵效果,注入压力升高至3.0倍和3.5倍水驱压力时的采收率增幅为0.74 百分点和0.88 百分点。但提升注入压力后大部分液体仍会进入储层高渗透部位,低渗透层吸液量增幅十分有限,进而影响解堵效果。为此,提出调剖+解堵联合作业工艺措施,即在注入解堵剂之前先进行调剖。与单纯解堵相比,当注入0.3、0.6 PV无机凝胶调剖剂时,调剖+解堵联合作业的采收率增幅分别为7.7百分点和12.19 百分点。

    Abstract:

    After long-term water injection and polymer injection development in Bohai L,S and J oilfields,the heterogeneity of reservoir is further enhanced. The polymer is retained in the reservoir,resulting in a significant decrease in liquid absorption capacity of the reservoir. Plugging removal is one of the most effective technical means to alleviate the current situation. In order to meet the needs of chemical flooding plugging removal technology in Bohai Sea,the plugging removal effect of compound plugging removal agent and scale dissolving agent composed of depolymerization agent,acid and chelating agent was evaluated. The influence and mechanism of injection mode,injection pressure and profile control measures on plugging removal effect were explored. The results showed that when the mass fraction of depolymerization agent composed of 1.0% ammonium persulfate and 0.5% inorganic corrosion inhibitor was 1.0% and the slug size was 0.05 PV,the permeability recovery rate of polymer-blocked core could reach 90.31%,indicating good depolymerization effect. When the mass fraction of scale dissolving agent composed of 0.54%citric acid and 5.46% chelating agent was 6.0% and 8.0%,the permeability recovery rate of three kinds of inorganic scale plugging cores was more than 80%,indicating good scale dissolution effect. Improving the injection rate of plugging removal agent could increase the injection pressure and improve the plugging removal effect. When the injection pressure increased to 3.0 times and 3.5 times the water flooding pressure,the recovery rate increased by 0.74 percentage point and 0.88 percentage point. However,after increasing the injection pressure,most of the liquid would still enter the high permeability part of reservoir,and then the increase of liquid absorption in low permeability layer was very limited,which would affect the plugging removal effect. Therefore,the combined operation technology of profile control and plugging removal was put forward. That is,profile control was carried out before plugging removal. Compared with simple plugging removal,when 0.3 PV and 0.6 PV inorganic gel profile control agent were injected,the recovery rate of profile control and plugging removal combined operation increased by 7.7 percentage points and 12.19 percentage points,respectively.

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崔天宇,卢祥国,高建崇,何 欣,刘进祥,孙惠茹.注聚合物井解堵剂及工艺措施解堵效果[J].油田化学,2024,41(4):616-623.
CUI Tianyu, LU Xiangguo, GAO Jianchong, HE Xin, LIU Jinxiang, SUN Huiru. Plugging Removal Effect of Plugging Agent and Supporting Measures in Polymer Injection Wells[J]. OILFIELD CHEMISTRY,2024,41(4):616-623.

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  • 在线发布日期: 2025-01-12
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