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川西气田长水平段井壁失稳机理及对策 被引量:2
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作者 彭红利 欧彪 +2 位作者 郭杰一 刘其明 钟敬敏 《天然气技术与经济》 2023年第3期48-54,共7页
四川盆地川西气田中三叠统雷口坡组气藏为潮坪相沉积,埋藏深、储层薄、井壁稳定性差,前期完钻11口水平井井壁失稳频发,影响开发效益。为了确保川西气田后续长水平井打成、打好、打快,有效降低井壁失稳复杂率,以川西海相水平段为研究对象... 四川盆地川西气田中三叠统雷口坡组气藏为潮坪相沉积,埋藏深、储层薄、井壁稳定性差,前期完钻11口水平井井壁失稳频发,影响开发效益。为了确保川西气田后续长水平井打成、打好、打快,有效降低井壁失稳复杂率,以川西海相水平段为研究对象,分析其井壁失稳机理,以及裂缝渗流对井壁稳定性的影响,制定对策措施。研究结果表明:井区井壁失稳主控因素为应力、裂缝、岩性;易塌层分布在最小水平应力钻进方向、裂缝发育区,掉块岩性为石灰岩或灰质白云岩;水基钻井液条件下,岩石强度下降了11.4%~17.5%,坍塌压力增加0.11MPa/100 m;油基钻井液条件下,不考虑裂缝渗流,岩石强度不会因油基钻井液浸泡及其浸泡时间而降低,考虑裂缝渗流,裂缝摩擦系数因油基钻井液浸泡下降12.8%,坍塌压力增加0.05~0.08 MPa/100 m。结论认为,按研究成果精细预测的钻井液密度窗口、水平段轨迹优化,确保了6口长水平井顺利完钻,井壁失稳复杂率降低43%,完井测试获天然气产量172×10^(4)~325×10^(4)m^(3)/d。 展开更多
关键词 川西气田 雷口坡组 长水平段 裂缝 地应力 井壁稳定性 坍塌压力 钻井液密度
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试论未来性原则在探井试采经济评价中的应用 被引量:1
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作者 吴利华 任小洪 +2 位作者 郭杰一 康雪茹 钟礼萍 《天然气技术与经济》 2023年第5期69-73,共5页
探井试采是气藏评价阶段的一项重要工作,投资项目财务评价的结果是投资决策的重要依据。为了解决试采意义重大但受已完成钻井投资影响大的项目经济性论证难题,以探井试采项目的经济评价方法为研究对象,分析了目前所使用评价方法,并基于... 探井试采是气藏评价阶段的一项重要工作,投资项目财务评价的结果是投资决策的重要依据。为了解决试采意义重大但受已完成钻井投资影响大的项目经济性论证难题,以探井试采项目的经济评价方法为研究对象,分析了目前所使用评价方法,并基于决策应是对将来投资进行的决策,结合探井试采项目的首要决策目标应是技术目标,提出了新的经济评价模型。研究结果表明:①在进行探井试采项目经济评价时,按照油气开发投资项目的经济评价方法,将已发生的钻井投资列入现金流的处理方式违背经济评价的基本原则之未来性原则。②将已完成钻井投资作为第一年现金流出的处理方法会低估项目的价值,甚至可能会导致错误的投资决策。结论认为:①仅以新增投资参与现金流分析的经济评价模型符合经济评价的未来性原则,可以提升项目内部收益率;②推荐探井试采项目在经济评价时仅以新增投资参与现金流分析。 展开更多
关键词 探井 试采 经济评价 未来性原则 新增投资
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Occurrence,sources,and relationships of soil microplastics with adsorbed heavy metals in the Ebinur Lake Basin,Northwest China
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作者 ZHANG Zhaoyong guo jieyi WANG Pengwei 《Journal of Arid Land》 SCIE CSCD 2022年第8期910-924,共15页
There is a lack of research on soil microplastics in arid oases considering the rapid economic development of northwestern China.Here,we studied the occurrence and sources of microplastics in soil,as well as the relat... There is a lack of research on soil microplastics in arid oases considering the rapid economic development of northwestern China.Here,we studied the occurrence and sources of microplastics in soil,as well as the relationships between microplastics and adsorbed heavy metals in the Ebinur Lake Basin,a typical arid oasis in China.Results showed that(1)the average microplastic content in all soil samples was 36.15(±3.27)mg/kg.The contents of microplastics at different sampling sites ranged from 3.89(±1.64)to 89.25(±2.98)mg/kg.Overall,the proportions of various microplastic shapes decreased in the following order:film(54.25%)>fiber(18.56%)>particle(15.07%)>fragment(8.66%)>foam(3.46%);(2)among all microplastic particles,white particles accounted for the largest proportion(52.93%),followed by green(24.15%),black(12.17%),transparent(7.16%),and yellow particles(3.59%).The proportions of microplastic particle size ranges across all soil samples decreased in the following order:1000-2000μm(40.88%)>500-1000μm(26.75%)>2000-5000μm(12.30%)>100-500μm(12.92%)>0-100μm(7.15%).FTIR(Fourier transform infrared)analyses showed that polyethylene terephthalate(PET),polypropylene(PP),polycarbonate(PC),polyethylene(PE),and polystyrene(PS)occurred in the studied soil;(3)random forest predictions showed that industrial and agricultural production activities and the discharge of domestic plastic waste were related to soil microplastic pollution,in which agricultural plastic film was the most important factor in soil pollution in the study area;and(4)seven heavy metals extracted from microplastics in the soil samples showed significant positive correlations with soil pH,EC,total salt,N,P,and K contents(P<0.01),indicating that these soil factors could significantly affect the contents of heavy metals carried by soil microplastics.This research demonstrated that the contents of soil microplastics are lower than other areas of the world,and they mainly come from industrial and agricultural activities of the Ebinur Lake Basin. 展开更多
关键词 occurrence characteristics source analysis soil microplastics heavy metals Ebinur Lake Basin
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