渗吸采油用非交联缔合型清洁压裂液体系
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1.中国石油新疆油田分公司工程技术研究院;2.西南石油大学化学化工学院;3.西南石油大学油气藏地质及开发工程国家重点实验室

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TE358

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Non-Crosslinked associative clean fracturing fluid system for imbibition oil recovery
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College of Chemistry and Chemical Engineering,Southwest Petroleum University,Chengdu

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    摘要:

    为进一步提高渗吸采油压裂液焖井后的采收率,研究了破胶液中残渣含量及稠化剂平均分子量对渗吸采收率影响,结果表明,破胶液中残渣含量及分子量越高,渗吸采收率越低。本文基于非交联缔合稠化剂,利用其结构特征及增粘机理,通过渗吸剂优选、渗吸剂与非交联缔合型稠化剂相互作用研究,构建了一套破胶后残渣低、分子量低的高效渗吸采油非交联缔合型清洁压裂液体系。体系组成为:非交联缔合型稠化剂CFZ(0.3%)+渗吸剂SZX-1(0.2%)+过硫酸铵(0.06%),该体系在90℃、170s-1下剪切90min黏度为77.43mPa.s,破胶液在油湿表面接触角31.6°,油水界面张力0.66mN/m,残渣含量17.2mg/L,重量平均分子量1.15×104,渗吸采收率14.8%。该体系为低渗透致密储层高效开发提供了理论依据及技术支持。

    Abstract:

    In order to further improve the recovery of imbibition fracturing fluid after well Shut-In, this paper studies the influence of residue content in gel breaking fluid and average molecular weight of thickener on imbibition recovery. The results show that the higher the residue content and average molecular weight in gel breaking fluid, the lower the imbibition recovery. Therefore, based on the non-crosslinked associative thickener, using its structural characteristics and viscosity increasing mechanism, aiming at a block in Xinjiang Oilfield , a set of imbibition recovery non-crosslinked associative clean fracturing fluid system with low gel breaking residue and low molecular weight was constructed by optimizing the imbibition agent and studying the interaction between the imbibition agent and the non-crosslinked associative thickener. The composition of the system is as follows: non-crosslinked associative thickener CFZ (0.3%) + imbibition agent SZX-1 (0.2%) + ammonium persulfate APS (0.06%). The results show that the viscosity of the system is 77.43 mPa.s at 90℃ and 170 s-1 for 90 min, the contact angle of the gel breaker on the wet oil surface is 31.6°, and the oil-water interfacial tension is 0.62 mN/m, the residue content is 17.2 mg/L and the average molecular weight is 1.15 × 104, the imbibition oil recovery is 14.8%. The system provides theoretical basis and technical support for the efficient development of low permeability tight reservoirs.

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  • 收稿日期:2021-07-22
  • 最后修改日期:2021-08-23
  • 录用日期:2021-09-03
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