Results 21 to 30 of about 10,121 (107)
Shiyou jixie, 2012 研究了非均质油藏注水井分层配注水嘴与各小层分注量、分注压力及各小层物性的关系，对各小层调配前、后注水量变化规律与调配水嘴选配问题进行分析，建立了适合非均质油藏分层配注水嘴优选的方法。将配水嘴优选软件在39口井上推广使用，测试层段配注符合率91.3%，比原来提高了10.5%，平均测调周期81.1 d，比原来延长了23.8 d。对胡状油田分注水井的32个层段配水嘴进行优化计算，并与实际测试情况进行对比分析。分析结果表明，实际注水量是稳定后的平均日注水量，最大误差10%，最小误差2%，平均误差3.31%。
蒋国栋 +3 more
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Why Pediatric Drowning Must Be a Global Health Priority: A Call to Action
World Medical &Health Policy, Volume 18, Issue 3, September 2026.ABSTRACT Pediatric drowning is a leading yet underrecognized cause of child mortality worldwide, disproportionately affecting children in low‐ and middle‐income countries (LMICs). While events in high‐income settings often reflect isolated lapses in supervision or safety barriers, in LMICs drowning is driven by structural inequities, including ...
Carlee Lenehan +4 more
wiley +1 more source
Shiyou jixie, 2014 针对现有的偏心分注工具不能满足薄互层油藏小卡距细分注水、原K344型偏心封隔配水器不适应大斜度注水井分注的问题，研制了P2Y341-115型细分层封隔配水器。该工具将1个压缩式封隔器与2台偏心配水器的功能集成一体，实现多个连续薄夹层注水井的分注，并大幅提高测试调配效率。现场应用7口井，封卡最薄油层4.4 m，最大井斜31.75°，均完成了分层验封、分层流量测试及水嘴投捞，平均配注符合率达到89.8%，平均使用寿命达到1 a以上。
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Functional Ecology, Volume 40, Issue 9, Page 2726-2736, September 2026.Read the free Plain Language Summary for this article on the Journal blog. Abstract Decomposition is the transformation of dead organic matter into its inorganic constituents. In most biomes, decomposition rates can be accurately predicted with simple mathematical models, but these models have long under‐predicted decomposition in globally extensive ...
Heather L. Throop +8 more
wiley +1 more source
Shiyou jixie, 2015 针对常规完井工艺不能一趟管柱完成注水井的分层酸化、分层注水施工的现状，设计了分层酸化、注水一体化管柱。该管柱主要由封隔器、酸化注水一体化配水器、定压配水器和洗井阀等组成，通过油管加压以及投球等操作，实现由下至上逐层酸化。现场19口井的应用情况表明，该管柱施工成功率100%，层段合格率均达到85%，实现了2层分注井的分层酸化、分层注水一体化完井，节约了作业成本，缩短了占井时间。该技术不改变现有投捞调配工艺，施工简单易行。
王宏万 +4 more
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Rare Metals, Volume 45, Issue 8, August 2026.ABSTRACT Due to their exceptional porosity, structural versatility, and modular coordination chemistry, metal–organic frameworks (MOFs) have emerged as versatile platforms for targeted drug delivery. These structures enable fine‐tuning of pore size, surface activity, and framework stability for the encapsulation of a broad range of therapeutics ...
Rui Hua +9 more
wiley +1 more source
Shiyou jixie, 2014 针对长庆低渗透油藏精细分层注水特点，常规分注技术存在实时监控难以及测调过程复杂等问题，提出了数字式分层注水技术。该技术应用配水器集成孔板流量计、一体化可调水嘴、电机、验封短节、井下电源、通信模块及控制芯片等部件，实现了配水器的自动验封、自动调节、数据实时录取与存储和无线通信的功能，极大地提高了注水过程的自动化水平。通过分析油管的沿程流阻、水嘴和流量计的阻力损失，建立了数字式分层注水井注水的流动特性分析力学模型。利用该模型可以计算得出井下各层的注水压力及水嘴开度关系，进而优化注水参数，提高分层注水效果。
杨玲智 +3 more
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World Water Policy, Volume 12, Issue 3, August 2026.ABSTRACT Groundwater depletion is a major challenge in semiarid, hard‐rock regions where irrigation demands often exceed natural recharge. This study evaluates the effectiveness of farm‐scale recharge pits as a local, supplementary, and community‐managed groundwater recharge solution in the Dharta catchment of Rajasthan, India. Alongside check dams and
Prahlad Soni +4 more
wiley +1 more source
The underappreciated roles of fog and dew on vegetation and biocrusts
New Phytologist, Volume 251, Issue 1, Page 46-63, July 2026.Summary Fog and dew represent minor components of ecosystem water budgets in most ecosystems. However, fog and dew can play an essential role in ecosystem dynamics and are particularly important for water‐limited systems. In addition to serving as direct water inputs, fog and dew can influence microclimate and water redistribution, thereby promoting ...
Lixin Wang, Yue Li, Mengyun Sun, Na Qiao
wiley +1 more source
Shiyou jixie, 2015 测调一体化分层注水技术测试调配效率高，已逐渐成为胜利油田分层注水主导工艺技术。结合油田油藏特征，胜利油田对测调一体化技术进行了改进和完善，并主要对配水器进行技术改进，设计了常规式、大压差式、免开式系列化可调配水器，满足了不同类型分层注水管柱的需求。同时针对高温高压注水需求开展了高温、高压密封材料优化研究，以满足120°、35 MPa高温高压注水需求；针对大斜度定向井，设计了测调仪器的滚轮式扶正装置，提高对井斜的适应性，满足井斜60°以内的测试调配。近年来 ...
李常友
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