Experimental Study on Hydraulic Pulsed and Cavitating Jet Drilling Technique in Deep Wells of Tahe Oilfield
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摘要: 塔河油田深井钻井水力能量利用效率低、机械钻速低、钻井成本高,严重制约了勘探开发速度。针对该油田钻井实际情况,结合二开φ241.3 mm井眼地层、钻具组合和水力参数,利用水力脉冲空化射流钻井技术提高机械钻速。该技术配合常规钻具和复合钻井钻具组合使用,脉冲空化射流发生器耦合脉冲射流和自振空化射流,改善井底流场及岩面应力状态,提高钻速。该技术在塔河油田进行了4口井5井次的现场试验,在常规泵压、排量、钻井液密度等参数条件下试验井深达6 162 m,试验井段与邻井相近井段在相近工况下机械钻速平均提高33.3%~74.3%,单套钻具纯钻时间超过260.0 h。试验结果表明,塔河油田二开井段砂岩、泥岩等地层配合PDC钻头应用水力脉冲空化射流钻井技术,能够很好地提高机械钻速。Abstract: Factors such as low hydraulic energy utilization efficiency and ROP,high drilling cost,etc.severely hindered the speed of petroleum exploration and development in Tahe Oilfield.In view of the real conditions of Tahe Oilfield,and drilling formation,BHA,and drilling parameters of the second drilling section φ241.3 mm wellbore,hydraulic pulsed and cavitating jet drilling were employed to increase ROP.Using conventional drilling tools and composite drilling tools,hydraulic pulsed and cavitating jet drilling technique modulates pulsed jet and cavitating jet to change flow field and rock stress state at the bottom of hole,and raise ROP.The technique had been applied 5 times in 4 wells in Tahe Oilfield.Under normal pumping pressure,flow rate and drilling fluid density,applied well depth reaches up to 6 162 m.The net drilling time of single set of drilling tool exceeded 260 h,the ROP in the applied well intervals was 33.3%-74.3% higher than adjacent wells which were similar in conditions.Field tests indicated that hydraulic pulsed and cavitating jet technique had a good adaptability to sandstone and mudstone formation of Cenozoic,Mesozoic and Palaeozoic group and different,together with PDC bit,it could enhance ROP by a large margin.
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Keywords:
- pulsed jet /
- cavitating jet /
- penetration rate /
- field test
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