Wellbore Blockage Removing Technologies in the Yuanba Gas Field
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摘要: 元坝气田投产以来，多口井出现了井筒堵塞，严重制约了气井的正常生产。对元坝气田典型井的堵塞物样品进行元素分析、无机成分XRD分析、有机成分IR分析、热重分析及其在酸液和乙醇中的溶解性分析，认为元坝气田不同气井的堵塞物成分存在差异。针对这种差异，在室内分别研制了有机解堵酸液和无机解堵酸液；并结合具体的井筒堵塞程度，分别配套了针对井筒节流和井筒完全堵死的有机、无机堵塞解堵工艺。元坝气田8口井应用井筒堵塞物清除技术进行了解堵作业，日增产气量316×104 m3，经济效益显著。井筒堵塞物清除技术可在类似超深高含硫气井中推广应用。Abstract: Since the Yuanba Gas Field was put into operation,wellbore blocking has been occurring in many wells and has seriously hindered the normal production of the gas wells.Through different studies on blockage samples from representative wells of the Yuanba Gas Field including element analysis,inorganic component XRD analysis,organic component IR analysis,the thermogravimetric analysis and solubility analysis of blockage samples in acid and ethanol,it has been found that some difference exist on the blockage compositions of various gas wells.In response to this identified difference,organic and inorganic blockage removing chemicals were developed.In addition,the team wished to remove specific wellbore blockages,so processes were developed to remove both organic and inorganic blockage that had been causing wellbore restriction and complete wellbore blockage.Such technologies have been successfully used to remove blockage in 8 wells in the Yuanba Gas Field.The results yielded remarkable economic benefits,with an increase in daily gas productivity increase of 3.16 million m3.The same kind of technologies can also be promoted in similar ultra-deep high-sulfur gas wells.
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Keywords:
- plugging /
- plug removing /
- organic acid /
- inorganic acid /
- coiled tubing /
- Yuanba Gas Field
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