基于γ-Al2O3载体的高孔隙率Ni-Mo催化剂制备及催化特超稠油降粘效果评价
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1.西南石油大学;2.中国石化碳酸盐岩缝洞型油藏提高采收率重点实验室,中国石油化工股份有限公司西北油田分公司;3.俄罗斯喀山联邦大学

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中国博士后科学基金资助项目(No.2018M631099).


PREPARATION OF HIGHLY POROUS NI-MO CATALYST BASED ON γ-AL2O3 AND ITS CATALYTIC EFFECT ON ULTRA-HEAVY OIL VISCOSITY REDUCTION
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    摘要:

    针对塔河油田特超稠油井筒掺稀降粘开采过程中存在的掺稀比高、频繁上返异常、难以实现经济有效开采的技术难题,本研究提出地面催化改质降粘+改质稀油回掺的开采技术,以节约掺稀油用量,提升开采效果。为了开发能够有效降低特超稠油粘度、实现地面改质的催化剂体系,针对塔河特超稠油高沥青质含量的特点,研发了一种基于γ-Al2O3载体的高孔隙度Ni-Mo催化剂,并评价了其地面改质降粘效果。实验结果表明,Ni-Mo催化剂可以将特超稠油50℃的粘度从28200mPa?s降低至298mPa?s。粘度降低接近100倍,降粘率为98.94%。密度从1.007g/ml降低至0.8724g/ml。同时,饱和烃的含量显著增加,胶质和沥青质的含量大幅降低。开发的催化剂体系对特超稠油显示了非常好的地面催化改质效果,具有广阔的应用前景。

    Abstract:

    The ultra-heavy oil reservoir in Tahe Oilfield is currently producing by mixing light oils with ultra-heavy oils in wellbore to reduce viscosity. However, the high ratio of needed light oils and abnormal fluid production caused by uneven mixing make the production low efficient and high cost. To solve this challenge, in this work, we proposed the technology of catalytic ex-situ upgrading for viscosity reduction + reinjection of upgraded oil into wellbore to save the amount of injected light oils and improve the recovery efficiency. To develop a catalyst system that can effectively reduce the viscosity of the ultra-heavy oil and achieve high-level ex-situ upgrading, a Ni-Mo catalyst with high porosity based on γ-Al2O3 carrier was developed and its catalytic effect on the ex-situ upgrading and viscosity reduction was evaluated. The results show that the developed Ni-Mo catalyst can reduce the viscosity of ultra-heavy oil at 50 ℃ from 28200 mPa.s to 298 mPa.s. The viscosity is reduced by nearly 100 times, and the viscosity reduction rate is 98.94%. The density is decreased from 1.007 g/ml to 0.8724 g/ml. At the same time, the content of saturates is significantly increased, and the content of resins and asphaltenes was greatly decreased. The developed catalyst system shows an excellent ex-situ catalytic upgrading effect for extra-heavy oil and has a great potential for field application.

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  • 收稿日期: 2022-08-09
  • 最后修改日期: 2022-10-18
  • 录用日期: 2022-11-09
  • 在线发布日期: 2023-05-29
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