致密气藏压裂用防水锁剂性能评价
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北京斯迪莱铂油气技术有限公司 CNAS 认证油气实验中心

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国家科技重大专项课题“深部碳酸盐岩热储层天然构造及人工干预下综合评价技术-专题三深部碳酸盐岩热储层增产试验与评价技术体系” (2019YFB1504103)


Performance Evaluation of Anti-Water Blocking Agent for Fracturing in Tight Gas Reservoirs
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    摘要:

    针对低压强亲水致密气藏的水力压裂,大量外来流体的侵入导致气藏产量低、改造效果差等问题,目前应对措施最为广泛、最为简便、经济效益明显的是添加防水锁剂预防水锁。市面上大量防水锁剂应用效果欠佳,究其原因是防水锁剂需要添加到压裂液体系中(或者前置液中),故其筛选和应用,需要评估其载体和使用环境对其性能的影响,确保防水锁剂发挥其应有的功能。通过研究氟碳阴离子FCY、氟碳非离子FCF以及自研纳米FC-ST三种不同类型的表面活性剂,考察不同因素对其性能影响,测试结果说明当压裂液黏度大于4mPa.s,会影响表面活性剂的溶解扩散,降低活性,增强亲水性,需要重视低黏压裂液的降解问题;纳米FC-ST可在120℃、0.5g/LAPS质量浓度下保持性能稳定,满足常见低压强亲水致密气藏的普遍温度需求;最高可耐受1×105mg/L矿化度配液水质,耐碱能力在pH≤11范围内;纳米FC-ST在滑溜水压裂液中可以显著降低毛管力,减少水自吸量,降低近井地带吸附,具有50%以上的渗透率同比恢复率,相较于常规防水锁剂、助排剂,性能受载体及环境影响小,预防水锁性能显著。

    Abstract:

    For hydraulic fracturing in low-pressure strong hydrophilic tight gas reservoirs, due to the invasion of a large number of outside fluids, the production of gas reservoirs is low, and fracturing is not effective. At present, the most extensive, simple and economical are the addition of anti-water blocking agent to prevent water blockage. A large number of anti-water blocking agents on the market are not well applied, and the reason is that anti-water blocking agents need to be added to the fracturing fluid system (or in the pre- fracturing fluid). Therefore, its screening and application need to evaluate the impact of its carrier and use environment on its performance, and to make sure the anti-water blocking agent performs its proper function. Three different types of surfactants, fluorocarbon anion, fluorocarbon nonionic and self-developed nano-FC-ST, were studied to investigate the effects of different factors on their performance. The results showed that the viscosity of the fracturing fluid was greater than 4mPa.s, it would affect the dissolution diffusion of the surfactant, reduce the activity, enhance the hydrophilicity, and pay attention to the degradation of low viscosity fracturing fluid; the nano-FC-ST could maintain stable performance at 120°C and APS of 0.5g/L, meet the temperature requirements of low-pressure strong hydrophilic tight gas reservoirs, and it could tolerate mineralization of water quality up to 1×105mg/L, the alkali resistance ranged from pH ≤11. Nano-FC-ST in the slick water fracturing fluid could significantly reduce the capillary force, reduce spontaneous imbibition of the water, reduce adsorption in the near well zone, and it had a recovery rate of more than 50% permeability, compared with conventional anti-water blocking agent, drainage aid, the performance was less affected by the carrier and the environment, the performance of the water blockage prevention is remarkable.

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  • 收稿日期: 2022-08-09
  • 最后修改日期: 2022-10-05
  • 录用日期: 2022-10-21
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