文章摘要
英西地区油井堵塞机理研究与防治方法
Plugging Mechanism and Preventing Technology of Oil Well in Yingxi Area
  
DOI:
中文关键词: 油井堵塞  氯化钠  防治方法  柴达木盆地
英文关键词: oil well plugging  sodium chloride  method of prevention and cure  Qaidam Basin
基金项目:中国石油重大科技专项“柴达木盆地建设高原大油气田勘探开发关键技术研究与应用”(项目编号 2016E-01)。
作者单位
朱秀雨,张海浪,王龙飞,党杨斌,周 燕,程 亮,余满林,张 祎 中国石油青海油田分公司甘肃 敦煌 736202 
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中文摘要:
      为了治理柴达木盆地英西地区深层油井堵塞物,采用电子扫描电镜(SEM)、离子滴定方法研究了储层岩石特征及其沉积物组成,分析了堵塞机理,并用环空注沉积抑制组合物防治技术对堵塞严重的油井进行现场施工。结果表明,在储层孔隙、岩石表面和裂缝中存在 NaCl晶体微粒,堵塞物主要为立方晶体结构的 NaCl。在井眼及抽汲过程中,由于储层的热力学、结晶动力学及流体动力学变化促使形成NaCl晶体微粒,无机盐沉积物与少量的有机杂质相互富积结晶沉积造成油井堵塞。环空注沉积抑制组合物防治技术对堵塞物的抑制率为90.0%~94.3%,治理后示功图载荷及形状波动变得平缓,油井洗井周期延长44 d,油井生产稳定性提高。图10表1参22
英文摘要:
      In order to control the blockage of deep wells in Yingxi area,Qaidam Basin,reservoir rock characteristics and precipitate composition were studied by scanning electron microscope and ion titration technology. The blocking mechanism was also analyzed.The prevention technology was used to carry out field operation in seriously blocked well,which was injected deposition inhibiting composition through annularspace. The results showed that there were NaCl crystal particles in the pore,rock surfaces and fracture of reservoir. The blockage was mainly NaCl with cubic crystal structure. In well hole and swabbing process,NaCl crystal particles formed under the condition of changing reservoir thermodynamics,crystallization kinetics and hydrodynamic. Moreover,plugging in oil wells would be caused by crystallization deposition,as the enrichment of inorganic matter and a few organic impurities enhanced. The sediment inhibition rate of blockage was 90.0%—94.3% after prevention technology which was injected deposition inhibiting composition through annularspace. The load and shape of indicator diagram became smoother after treatment. The well washing cycle was extended for 44 days and the production stability of oil well was improved.
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