文23枯竭砂岩型储气库微泡钻井液技术  

Drilling fluid technology for the Wen-23 depleted sandstone gas storage

作　　者：刘自广 LIU Ziguang(The Second Drilling Company of Sinopec Zhongyuan Petroleum Engineering Ltd.,Puyang Henan 475001,China)

机构地区：[1]中石化中原石油工程有限公司钻井二公司,河南濮阳475001

出　　处：《钻探工程》2022年第2期117-122,共6页Drilling Engineering

基　　金：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)。

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/cm^(3),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。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℃ 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℃ was developed. Test showed that the micro-foam drilling fluid system had a density change of only 0.04g/cm^(3) after 72hrs aging at 120℃. 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-23gas 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℃ 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.

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 

分 类 号：TE254[石油与天然气工程—油气井工程] P634.6[天文地球—地质矿产勘探]