The first exploration oil well in any oil block consumes in general more time and cost than the other wells in the same block. Evaluating the drilled wells serves to improve the future operations. This paper evaluates...The first exploration oil well in any oil block consumes in general more time and cost than the other wells in the same block. Evaluating the drilled wells serves to improve the future operations. This paper evaluates the drilled surface section through real field data for the first exploration oil well drilled in one of the oil blocks, in Kurdistan north of Iraq. The surface section of the well was drilled with the conventional method to penetrate many different geological formations with tight intervals. Drilling efficiency and the difficulties encountered are discussed and explained using various data sources. All daily drilling reports concerning a specific interval were studied. This includes weight on bit, string rotation, mud pump flow and penetration rate. Evaluation was carried out by analyzing the used controllable drilling parameters with the formations features. Penetration of the Pila Spi formation (Middle Eocene) was the most difficult formation in the drilled section. Microsoft Office 365 Pro Plus used in making graphs and Excel tables. Evaluations showed that the conventional technology used left many negative effects, like increase in None Productive Time NPT, cost and ground water pollution. Simultaneous Casing Drilling method proposed as an alternative method for the future campaign.展开更多
小井眼二开水平井具有周期短、节省钻井成本的优点,但在钻进过程中会出现的井眼轨迹控制难、机械钻速(rate of penetration,ROP)慢、井壁易垮塌和易发生井漏等问题,针对上述问题对苏里格气田区小井眼水平井进行优化设计。井身结构的设...小井眼二开水平井具有周期短、节省钻井成本的优点,但在钻进过程中会出现的井眼轨迹控制难、机械钻速(rate of penetration,ROP)慢、井壁易垮塌和易发生井漏等问题,针对上述问题对苏里格气田区小井眼水平井进行优化设计。井身结构的设计采用自下而上的设计原则,确定井身结构为小井眼二开水平井,二开结构可以减少下钻次数,缩短钻井周期;井眼轨迹设计采用五段制中的“直-增-稳-增-水平”井眼轨道设计,增加稳斜段弥补造斜不足的问题;针对钻遇地层特征优选钻具组合,应用聚晶金刚石复合片(polycrystalline diamond compact,PDC)钻头提高破岩效率;针对易塌易漏地层进行钻井液的分析研究,优选聚合物钻井液提高井壁稳定性。经过现场的应用,解决了井壁易塌易漏问题,提高了机械钻速,缩短了钻井周期。结果表明:小井眼二开水平井的结构设计合理,可以在现场进行推广。展开更多
文摘The first exploration oil well in any oil block consumes in general more time and cost than the other wells in the same block. Evaluating the drilled wells serves to improve the future operations. This paper evaluates the drilled surface section through real field data for the first exploration oil well drilled in one of the oil blocks, in Kurdistan north of Iraq. The surface section of the well was drilled with the conventional method to penetrate many different geological formations with tight intervals. Drilling efficiency and the difficulties encountered are discussed and explained using various data sources. All daily drilling reports concerning a specific interval were studied. This includes weight on bit, string rotation, mud pump flow and penetration rate. Evaluation was carried out by analyzing the used controllable drilling parameters with the formations features. Penetration of the Pila Spi formation (Middle Eocene) was the most difficult formation in the drilled section. Microsoft Office 365 Pro Plus used in making graphs and Excel tables. Evaluations showed that the conventional technology used left many negative effects, like increase in None Productive Time NPT, cost and ground water pollution. Simultaneous Casing Drilling method proposed as an alternative method for the future campaign.
文摘小井眼二开水平井具有周期短、节省钻井成本的优点,但在钻进过程中会出现的井眼轨迹控制难、机械钻速(rate of penetration,ROP)慢、井壁易垮塌和易发生井漏等问题,针对上述问题对苏里格气田区小井眼水平井进行优化设计。井身结构的设计采用自下而上的设计原则,确定井身结构为小井眼二开水平井,二开结构可以减少下钻次数,缩短钻井周期;井眼轨迹设计采用五段制中的“直-增-稳-增-水平”井眼轨道设计,增加稳斜段弥补造斜不足的问题;针对钻遇地层特征优选钻具组合,应用聚晶金刚石复合片(polycrystalline diamond compact,PDC)钻头提高破岩效率;针对易塌易漏地层进行钻井液的分析研究,优选聚合物钻井液提高井壁稳定性。经过现场的应用,解决了井壁易塌易漏问题,提高了机械钻速,缩短了钻井周期。结果表明:小井眼二开水平井的结构设计合理,可以在现场进行推广。
