Drilling and Completion Technologies for of Geothermal Wells with Medium and Low Temperatures
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摘要: 为了提高中低温地热井工程质量，保障单井产能，优化了地热井钻井完井工艺技术，形成了适用于砂岩热储的二开井身结构和适用于基岩热储的三开井身结构；采用悬挂器连接、连接重叠段固井水泥密封的方式，防止泵室段底部水层窜通；优化了适用于不同地区、不同储层完井的花管、绕丝筛管和割缝衬管的设计参数；针对热储层极易漏失的特点，发展了钻井液正循环钻进、清水正循环钻进、清水充空气正循环钻进和气举反循环钻进等4种钻进工艺；根据生产需求，明确了地热井测井参数要求、固井技术要点及组合洗井工艺。该技术在清丰XBXZ-1井现场应用后，下入多级泵试水24 h，流量120 m3/h，水温68℃，静液面15.50 m，动液面48.00 m。中低温地热井钻井完井工艺成功解决了地热钻井完井过程中存在的钻井液漏失严重、水位衰减快、沉砂严重和开采水层与表层水之间的互窜等问题，具有较好的推广应用价值。Abstract: To enhance the engineering quality of geothermal wells and to obtain desirable single well productivity,geothermal drilling and completion technologies have been optimized,and developed casing program with two sections suitable for geothermal development in sandstone formations and three sections suitable for matrix formations.Hanger connections,together with sealing by cementing slurry in overlapping sections have been developed to eliminate possibility of water channeling in bottom sections of the pumping chamber.In addition,design parameters for perforated PVC pipe,wire-wrapped screens and slotted liners are optimized to satisfy the demand of completion in different formations and different areas.Four drilling techniques,including mud circulation drilling,freshwater circulation drilling,gas-charged water circulation drilling and gas-lifting reverse circulation drilling,have been developed for thermal reservoir susceptible to lost-circulation.According to the requirement of production,logging parameters,cementing and integral flushing technologies in geothermal wells have been specified.The newly developed technologies have been deployed on site of the Well Qingfeng XBXZ-1,with multistage pump testing water for 24 h,flow rate of 120 m3/h,water temperature of 68℃,the static liquid level being 15.50 m,the dynamic liquid level being 48.00 m.Successful drilling and completion technologies for geothermal wells at medium or low temperatures can effectively eliminate severe lost circulation,fast drop in water levels,undesirable settling of cuttings,channeling of water between target formation and surface layer,etc.It has bright prospects in promotionand application.
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Keywords:
- low medium temperature /
- geothermal well /
- drilling /
- completion
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