LG-2复合线性胶压裂液性能与现场应用
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1.中国石油新疆油田公司实验检测研究院 新疆克拉玛依;2.中国石油新疆油田公司实验检测研究院 新疆克拉玛依

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国家科技重大专项“化学驱提高采收率技术”(项目编号2016ZX05010-004)


Study and Field Application of Organic Boron/Zirconium Composite Linear Gel Fracturing FluidWAN Qingshan1*, BAI Lei1,LI Bin2,CHEN Liyan1,ZHAKE Jian1
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    摘要:

    区别于单胶液体系,本文依据部分水解聚丙烯酰胺(HPAM)、多羟基醇弱凝胶形成原理,用有机硼/锆复合交联剂FHBZ-1与HPAM及多羟基醇共同作用制备交联凝胶,并将其用作LG-2复合线形胶压裂液。分别评价了LG-2线性胶压裂液体系的交联性能、耐温耐剪切性能及破胶性能。在110℃,170s-1恒速剪切120min条件下与HPAM/有机锆单一凝胶体系进行了耐温耐剪切能力对比,其中LG-2线性胶压裂液的最终粘度为103 mPa.s,而单一HPAM/有机锆凝胶仅为48mPa.s。同时,在130℃,170s-1恒速剪切速率下,LG-2线性胶得到交联冻胶峰值粘度为448mPa.s,充分显示其良好的耐温耐剪切性能。评价了LG-2线性胶压裂液在60℃及90℃时破胶性能,LG-2线性胶压裂液破胶液粘度小,残渣量低,分别为约16mg/L 及12mg/L。通过WY-8页岩气井现场试验验证LG-2线性胶压裂液体系具有优良的造缝携砂性能。

    Abstract:

    Based on the formation principle of partially hydrolyzed polyacrylamide (HPAM) and polyhydroxyl alcohol weak gel, the crosslinking agent FHBZ-1 was used to prepare the crosslinking gel with HPAM and polyhydroxyl alcohol, and it was used as the fracturing fluid of LG-2 composite linear gel. Zirconium crosslinking agent was prepared by mass ratio of Zirconium chloride, lactic acid, propyl alcohol, triethanolamine of 6:5:1:24 in 75℃ water bath for 2h. Boron cross-linking agent was prepared by mass ratio of Borax, mannitol, water/glycerol (volume ratio 3:1) Mixed solvent, NaOH of 18:16:6:2, pH value: about 10, reaction temperature: 80℃, reaction time 5h.The organic boron crosslinking agent and the organic zirconium crosslinking agent were mixed according to the volume ratio of 1:2 to form FHBZ-1.The crosslinking, temperature resistance and shear resistance of LG-2 linear gel fracturing fluid system were evaluated respectively.Experiment from LG - 2 linear gel fracturing fluid optimization ratio of 0.3% (wt) HPAM + 0.5% (wt) CPA - 1 + 1.2 (v) % FHBZ - 1 + 0.05% (v) ZP + 0.3% + 0.05% APS NW (v).The final viscosity of 448mPa?s was obtained by shear at a constant speed of 170s-1 for 90min at 130℃, indicating its good temperature and shear resistance.The performance of LG-2 linear glue fracturing fluid was evaluated at 60 and 90℃. The viscosity of LG-2 linear glue fracturing fluid was small, and the amount of residue was low, which was about 16mg/L and 12mg/L, respectively.Field test of WY-8 shale gas well verified that LG-2 linear glue fracturing fluid system has excellent performance of seam making and sand carrying.

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  • 收稿日期: 2020-09-07
  • 最后修改日期: 2020-10-07
  • 录用日期: 2020-10-10
  • 在线发布日期: 2021-12-02
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