| 文23枯竭砂岩型储气库微泡钻井液技术 |
| 投稿时间：2022-02-14 修订日期：2022-02-28 点此下载全文 |
| 引用本文：刘自广.文23枯竭砂岩型储气库微泡钻井液技术[J].钻探工程,2022,49(2):117-122.LIU Ziguang. Drilling fluid technology for the Wen-23 depleted sandstone gas storage[J]. Drilling Engineering, 2022,49(2):117-122. |
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| 基金项目:中国石化集团公司科技攻关项目“中原文23储气库钻完井关键技术”（编号：P18098-1） |
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| 中文摘要:文23储气库是以巨厚盐层为盖层的枯竭砂岩气藏型储气库，具有地层孔隙度高、渗透率变化大、压力系数低、亏空严重等特点，钻井过程中井漏、地层污染等问题突出。为此，研发了发泡剂、稳泡剂，开发了抗温120 ℃防漏型低密度微泡钻井液体系。该体系在120 ℃条件下，经72 h老化后密度变化仅0.04 g/cm3，仅需325 mL承压即可达到10 MPa以上，对地层的渗透率恢复值达87.9%。微泡钻井液先后在文23储气库现场应用66口井，漏失发生率仅为13.6%，施工期间井壁稳定。抗温120 ℃防漏型低密度微泡钻井液在文23储气库建设中表现出了良好的防漏效果，同时有效地保障了井壁稳定，降低了储层伤害，为文23储气库安全、高效开发提供了有力技术保障。 |
| 中文关键词:砂岩型气藏 超低压储层 漏失 微泡钻井液 文23储气库 |
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| Drilling fluid technology for the Wen-23 depleted sandstone gas storage |
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| Abstract:The Wen-23 gas storage reservoir is a depleted sandstone type gas reservoir with a massive salt rock cover and a maximum temperature of 120°C at the bottom. To address severe leakage and formation contamination during drilling in the Wen23 reservoir， a leak-proof low-density micro-foam drilling fluid system with a temperature resistance of 120°C was developed. Test showed that the micro-foam drilling fluid system had a density change of only 0.04g/cm3 after 72hrs aging at 120°C. Only 325mL was required to reach a pressure of 10MPa or more with the permeability recovery value of the formation up to 87.9%. The micro-foam drilling fluid has been applied to 66 wells in the Wen-23 gas storage reservoir with the incidence of leakage only 13.6%， and the well wall was stable during the drilling operations. The leak-proof low-density microfoam drilling fluid with 120°C resistance has demonstrated good leak prevention in the construction of the Wen-23 gas storage reservoir with effective protection of the well wall stability and reduction of the damage to the reservoir， providing a guarantee for the safe and efficient development of the Wen23 gas storage reservoir. |
| keywords:sandstone type gas reservoir ultra low pressure reservoirs leakage micro-foam drilling fluids Wen-23 gas storage |
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