低压深井连续油管气举工艺的应用
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TE355;TE357;TE377

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国家科技重大专项(2017ZX05030005)


Research and Application of Gas Lift Process with Coiled Tubing in Low-pressure Deep Wells
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    摘要:

    针对肯基亚克油田盐下石炭系油藏低压高产深井因地层压力保持度低导致停产的复产难题,分析了常规多级气举的下入深度技术受限原因,创新性的提出将连续油管速度管柱和气举技术结合应用于盐下油田井深超过4 000 m的采油井,效果良好,在国内外属首次使用,并获得了哈萨克斯坦国家专利(№1951 от 22,12,2016г)。理论上,连续油管下放越深,井底流压越低,较大的生产压差有利于地层出液可有效释放油井潜能,同时配合气举得到较好的排采效果。目前盐下注气管网压力到配气间114 atm,模拟计算得出连续油管悬挂深度>4 000 m,正好满足目的井层的排采需求,并通过连续油管入井试验得到了验证。此技术带压作业,不污染储层,同时解决了压井后产量恢复较难的问题,该技术的应用降低了井底流压,排出了井底及近井地带高含水积液,清除了近井地带堵塞,单井复产后增油效果良好,并可持续安全生产。该技术获得现场成功应用,4口井累积增产原油42 627 t,有效改善了因地层压力低或是常规气举无法复产等原因导致的停产井。该技术的成功应用获得了良好增油效果和经济效益,为油价持续不振的情况下降本增效提供了技术突破与保障。

    Abstract:

    In view of the difficulties in resuming production after shutdown of the low-pressure high-productivity deep wells in Carboniferous reservoirs in pre-salt Kenjiyake oilfield due to poor formation pressure maintenance, the reasons why the setting depth of conventional multistage-gas lift tools is limited were analyzed, and an innovative approach, i.e., the combination of coiled tubing (as a velocity string) and gas lift technology was proposed for wells with a depth exceeding 4,000 m in pre-salt oilfields. This approach was carried out for the first time worldwide, and has won the national patent of Kazakhstan (№1951 от 22,12,2016г). Theoretically, the deeper the coiled tubing is lowered, the lower the bottom hole flowing pressure is. A larger drawdown will facilitate the formation fluid influx, bring the well potential into full play, and finally achieve a better drainage and production effect in combination with gas lift. At present, the pressure at the gas distribution station of the injection pipe network is 114 atm, and the setting depth of coiled tubing can be 4,000 m or more as suggested by simulating calculation, which exactly satisfies the drainage and production requirements of target zones. This calculation has been verified by a pilot test on running of coiled tubing. This technology works under snubbing conditions, doesn't contaminate reservoirs and meanwhile overcomes the difficulties in resuming production after well killing. The application of this technology reduces the bottom-hole flowing pressure, removes the high water-cut liquid loading at hole bottom and in the vicinity of it, and eliminates the plugging thereof. Reasonable incremental production has been realized in individual wells upon resuming production, achieving sustainable safe production. This technology was successfully applied on the site; the total incremental production from 4 wells reached 42,627 tons. The shutdown wells caused by low formation pressure or failure of production resumption by conventional gas lift were effectively utilized. The successful application of this technology has generated a good effect in incremental production, and provides a technological breakthrough and guarantee for cost-effective operations under the condition of long-lasting sluggish oil price.

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孙杰文,贾凡飞,闫若愚,等. 低压深井连续油管气举工艺的应用[J]. 科学技术与工程, 2019, 19(5): .
孙杰文,,,et al. Research and Application of Gas Lift Process with Coiled Tubing in Low-pressure Deep Wells[J]. Science Technology and Engineering,2019,19(5).

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  • 收稿日期:2018-08-31
  • 最后修改日期:2018-12-03
  • 录用日期:2018-12-17
  • 在线发布日期: 2019-02-25
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