深层页岩气压裂用高黏高降阻一体化稠化剂
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1.中国石化石油工程技术研究院;2.四川大学高分子研究所

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中国石化科技攻关项目“深层页岩气高导流复杂缝网压裂关键技术”(项目编号P20046-3),高分子材料工程国家重点实验室开放基金探索项目“页岩气开采用智能高分子材料的研究”(sklpme2014-2-06)


Integrated Thickener with High-Viscosity and High-Drag Reduction used for Fracturing Deeper Shale Gas
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    摘要:

    滑溜水水力压裂是高效开发页岩气的重要手段,但存在黏度低、淡水用量大和胶液不可自由转换等系列问题,限制了其在3500m以深的深层页岩气中的应用。为解决上述问题,室内合成了高黏高降阻一体化稠化剂(HVFR),考察了其溶解性、增黏性、降阻性、携砂性及耐温耐剪切性。结果表明,其相对分子质量为22.7x10^6 g/mol,HVFR表现出快速的溶解速率,1min增黏率达到93%,有利于实现压裂液的在线连续混配。在150 L/min 流量下,作为低黏、高黏滑溜水时的降阻率均大于70%;作为胶液时,降阻率可达到68%,具有一剂多能特性,通过调整HVFR的浓度实现低黏滑溜水、高黏滑溜水和胶液之间的自由转换。基于HVFR的交联压裂液具有良好的携砂能力及耐温耐剪切性能,在120 oC、170 s^(-1)条件下剪切120min后,压裂液保留黏度为120 mPa*s。

    Abstract:

    Slick water hydrofracking represents an important technique for the efficient development of shale gas, but there are a series of challenges such as low viscosity, large freshwater consumption and slick water-to-gel transition, which limit its application in hydrofracking of deeper (>3500 m) shale gas reservoirs. To address these issues, an integrated thickener with high-viscosity and drag reduction (HVFR) was synthesized by free radical polymerization, and their solubility, thickening ability, drag reduction and proppant carrying capability as well as heat- and shear-resistance were examined. The results showed that the viscosity-average molecular weight of HVFR is 22.7 x 10^6 g/mol, and the HVFR exhibited a rapid dissolution rate with thickening rate of 93% within 1 min, which is conducive to the online continuous mixing of fracturing fluid. At a flow rate of 150 L/min, the drag reduction can reach higher than 70% for both low- and high-viscosity slick water, and up to 68% for gel. It is also demonstrated that HVFR thickener exhibited multifunctional properties and can be freely transited between low- and high-viscosity slick water as well as gel by altering the concentration of HVFR. The cross-linked fracturing fluid based on HVFR displayed not only remarkable heat- and shear-resistance, but also proppant carrying capacity. The viscosity of the cross-linked fracturing fluid can be maintained at 120 mPa*s after shearing for 120 min at 120 oC and 170 s^(-1).

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  • 收稿日期: 2021-12-07
  • 最后修改日期: 2021-12-19
  • 录用日期: 2021-12-22
  • 在线发布日期: 2022-04-11
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