基于支撑剂嵌入实验的玛湖凹陷砾岩储层CO2泡沫压裂液体系优选
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1.中国石油新疆油田分公司工程技术研究院;2.中国石油大学(北京)石油工程学院

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TE357.1

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国家自然科学基金(51974356);中国石油大学(北京)科研基金(2462021YXZZ012)


OPTIMIZATION OF CO2 FOAM FRACTURING FLIUD SYSTEM IN CONGLOMERATE RESERVOIR OF THE MAHU BASIN WITH PROPPANT EMBEDDING EXPERIMENT
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Research Institute of Engineering Technology, PetroChina Xinjiang Oilfield Company

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    摘要:

    CO2泡沫压裂可以减少储层伤害,有助于非常规油气藏增产开发,但目前缺少定量评价泡沫压裂液碳水比对导流能力影响程度的方法,泡沫压裂液体系碳水比优选存在不足。为优选适用于玛湖凹陷砾岩储层的CO2泡沫压裂液体系,开展模拟储层条件下不同碳水比泡沫流体作用下支撑剂嵌入实验,得到了各嵌入深度区间的比例,建立考虑支撑剂非均质嵌入的导流能力模型,计算获得不同泡沫流体提高导流能力的效果并分析其作用机理。结果表明,使用CO2替代部分水基压裂液,可以降低支撑剂的嵌入程度;随着CO2比例升高,泡沫流体提高导流能力的效果逐渐减弱并达到上限,模型导流能力较水基提高约12%;以黏土矿物含量20%为界,碳水比7:3时低黏土含量试件导流能力提高达到上限,高黏土矿物含量试件的导流能力受碳水比的影响更敏感,达到上限时碳水比较低;CO2泡沫压裂液可以提高支撑裂缝-缝周边地层系统的渗流能力,实验低估了其作用效果。该研究可为CO2泡沫压裂液体系碳水比优化提供参考。

    Abstract:

    CO2 foam fracturing can reduce reservoir damage and contribute to the stimulation of unconventional oil and gas reservoirs. However, there needs to be more quantitative methods to evaluate the influence of the CO2-H2O ratio of foam fracturing fluid on the conductivity, and the optimization of foam fracturing fluid system is insufficient. To select the CO2 foam fracturing fluid system suitable for the conglomerate reservoir in the Mahu basin, proppant embedment experiments are carried out with the treatment of foam fluid with different CO2-H2O ratios at simulated reservoir conditions, and each interval of embedment depth is obtained. A conductivity model considering the heterogeneous proppant embedment is established to calculate the effects of different foam fluids on improving the conductivity and analyze its mechanism. The results show that using CO2 to replace part of the water-based fracturing fluid can reduce the degree of proppant embedment. With the increase of the CO2-H2O ratio, the effect of improving the conductivity weakens and reaches the upper limit gradually, increasing by about 12% compared with that of water-based fracturing fluid. When the ratio is 7:3, the conductivity of samples with low clay content (< 20%) increases to the upper limit. However, the conductivity of samples with high clay mineral content (≥20%) is more sensitive to the influence of the CO2-H2O ratio, and the c upper limit is lower. CO2 foam fracturing fluid can improve the hydrological capacity of the propped fracture-formation system, but its effect has been underestimated in this experiment. This study can reference the CO2-H2O ratio optimization of the CO2 foam fracturing fluid system.

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董景锋,刘凯新,路宗羽,等. 基于支撑剂嵌入实验的玛湖凹陷砾岩储层CO2泡沫压裂液体系优选[J]. 科学技术与工程, , ():

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  • 收稿日期:2024-02-27
  • 最后修改日期:2024-04-18
  • 录用日期:2024-04-25
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