海南流沙港组致密砂岩体积压裂工艺研究及应用          下载免费PDF全文

魏凯  邓校国  付杰  张智勇  李凯 《探矿工程》2022,49(5):194-201

福山凹陷流沙港组致密砂岩是海南福山油田勘探开发的重要目标之一。受复杂构造演化影响,该区致密砂岩具有砂泥薄互层明显、低孔低渗、高温等特征,为了解决以往储层改造中经常出现的施工压力高、缝高失控、砂堵、单井产量低、压裂后产量下降快等问题。借鉴非常规体积压裂技术,采用变排量、人工隔层控缝高、暂堵转向等工艺,同时进一步优化压裂液,应用纳米增效洗油剂,在福山油田致密砂岩开展了4口井次试验。研究结果表明：非常规体积压裂技术可有效降低砂堵风险,提高福山油田致密砂岩储层的改造效果。变排量、人工隔层控缝高、暂堵转向压裂等储层改造工艺的实施,有效控制了缝高,提高了储层的压开程度。纳米增效洗油剂的应用,最大限度地降低了液体对地层和裂缝的伤害,发挥了纳米液滴渗吸洗油作用,增加了油气井的稳产期。  相似文献   

四川尔呷地吉铅锌矿区复杂地层钻探施工技术          下载免费PDF全文

刘兵 《探矿工程》2022,49(4):87-92

四川尔呷地吉铅锌矿区位于南北向甘洛-小江断裂（本区内称为马拉哈断裂）北段与马拉哈背斜的复合部位。区域地质条件复杂,岩层破碎、裂隙发育,存在钻孔坍塌、漏失、缩径、掉块等钻探难题。为避免井内复杂事故、缩减钻井周期、降低作业风险,在该矿区开展了钻探技术研究工作。以ZK4522、ZK4737、ZK7545钻孔施工问题为例,重点剖析了钻孔事故频发的原因,提出了改进措施,总结了适合该矿区钻探施工的钻孔结构设计,并对不同地层使用冲洗液配方进行了阐述,对水泥浆护壁工艺、套管护壁工艺采取了技术管控措施,在该矿区取得了良好的效果,形成了一套具有实际参考价值的钻探施工方案,为该矿区以后的施工提供了技术保障措施和经验,同时对其他类似钻探施工也具有一定的借鉴意义。  相似文献   

凝胶堵漏技术在阳山矿区漏失地层中的应用          下载免费PDF全文

石立明  曹灶开 《探矿工程》2015,42(9):22-24,29

甘肃省文县阳山矿区地质构造复杂,地层破碎蚀变强烈,多层位漏失,钻探施工漏失现象普遍。在研究地层漏失机理的基础上试验应用了聚合物凝胶堵漏技术。ZK2232孔的现场应用表明,聚合物凝胶堵漏剂与其他惰性桥堵剂配合使用,能很好地解决钻进过程中的恶性漏失问题,堵漏效果较好。在堵漏施工中,聚合物凝胶堵漏不受漏失通道的限制,能够通过挤压变形进入裂缝和孔洞空间,最终达到封堵漏层的目的。  相似文献   

Determination of allowable subgrade frost heave with the pavement roughness index in numerical analysis     

HongYan M  Feng Zhang  DeCheng Feng  Bo Lin 《寒旱区科学》2015,7(5):587-593

Frost heave is an upward swelling of soil during cryogenic conditions in cold regions. It is caused by the accumulation of ice crystals in subgrade soil, which grow upwards when freezing temperatures penetrate into the subgrade. This study establishes the allowable soil subgrade frost heave based on the roughness standard of asphalt pavement in China, and aims to balance the pavement design and frost heave resistance of subgrades in cold regions. We formulated a mechanical model of pavement supported by the boundary conditions of differential frost heave, based on the elastic layered system theory. The differential soil subgrade frost heave was modeled as a sinusoidal function, and the allowable frost heave and the roughness index were modeled as the displacement boundaries for the top and bottom of the pavement structure. Then the allowable frost heave was back-calculated according to the roughness standard. Numerical results show that the allowable frost heave depends on the pavement structure, material properties, the highway grade, and other factors. In order to ensure that the actual soil subgrade frost heave is lower than the allowable frost heave, pavement structures and materials need to be selected and designed carefully. The numerical method proposed here can be applied to establish the frost heave resistance of subgrade when the pavement structure and materials are determined.  相似文献   

Gas formation mechanism of marine carbonate source rocks in China   总被引：5，自引：1，他引：4  

ZHAO Wenzhi  WANG Zhaoyun  HE Haiqing  ZHANG Mingjie  WANG Hongjun  WANG Yunpeng & QIN Yong . Research Institute of Petroleum Exploration & Development  PetroChina  Beijing  China  . PetroChina Exploration & Production  Beijing  China  . Department of Geology  Lanzhou University  Lanzhou  China  . Guangzhou Geochemical Institute  Chinese Academy of Sciences  Guangzhou  China  . China University of Mining  Technology  Xuzhou  China 《中国科学D辑(英文版)》2005,48(4):441-453

It has been proven in exploration practice that thecarbonates in China not only can generate hydrocar-bons, but also form commercial reservoirs. The car-bonates are different from clastic rocks in view of theirdeposition environment as well as their sedimentaryand diagenetic processes. Therefore, the evaluationcriteria and hydrocarbon generation mechanism forcarbonates can not be the same as that for clasticrocks, and it is important to establish a special hydro-carbon generation mechanism and…  相似文献   

新和地1井复杂地层水泥封孔护壁造斜技术          下载免费PDF全文

肖长城  贾中芳  高士彬  李明 《探矿工程》2019,46(2):50-54

新和地1井在钻进1314.00～1419.98 m孔段时钻遇巨厚破碎带,地层高度破碎、大倾角、富含水系,孔壁掉块、水敏坍塌现象严重。钻进时孔内阻力大,钻具放不到底,孔内事故多发,破碎带难以钻穿。为处理孔内事故并钻穿巨厚破碎带,采用水泥封孔护壁造斜技术。受孔内复杂因素影响,特别是1358.76～1396.46 m破碎带内水系对水泥浆的稀释和冲蚀破坏作用,前期多次水泥封孔失败,浪费了大量物资及工期。现场通过试验,总结出了一套有针对性的、实用的技术方案,解决了现场的水泥封孔技术难题,提高了水泥封孔护壁造斜的成功率。新和地1井深孔复杂地层水泥封孔护壁造斜技术对今后施工类似工程具有一定的参考意义。  相似文献   

沥青实验与评价方法综述     

张海涛  潘勇  夏振雪 《海岸工程》2004,23(1):73-82

通过对常规沥青试验与评价方法和美国SHRP沥青路用性能规范(AASHTO MP1)的分析和比较,认为现阶段采用常规沥青试验与评价方法结合SHRP规范将是沥青质量控制与评价最有效的手段。  相似文献   

The Greening of Baltimore's Asphalt Schoolyards          下载免费PDF全文

Geoffrey L. Buckley  Christopher G. Boone  J. Morgan Grove 《Geographical review》2017,107(3):516-535

Asphalt was becoming an integral part of the urban American landscape by the end of the nineteenth century. Not only was it emerging as the preferred alternative for street paving, its promoters were endorsing it for other purposes as well. Although Baltimore was not in the vanguard when it came to adopting asphalt for road surfaces, it soon followed the trend. Like other cities, it too found other applications for this versatile petroleum product, including the paving of playgrounds and schoolyards. Despite low maintenance costs, widespread use of asphalt as a recreational surface started to meet resistance in Baltimore during the 1960s. Fifty years later, stringent storm‐water runoff requirements are causing city officials to rethink how they deploy asphalt in an urban setting. In an effort to meet these new requirements, while at the same time improve recreational opportunities for school children, an alliance of government agencies, nonprofit organizations, and private developers has developed a strategy to remove asphalt from schoolyards—one that may serve as a model for other cities facing financial and sustainability challenges similar to those of Baltimore.  相似文献   

Laboratory and field performance of recycled aggregate base in a seasonally cold region     

Tuncer B. Edil  Bora Cetin  Ali Soleimanbeigi 《寒旱区科学》2017,9(3):183-191

The objective of this project was to characterize the freeze-thaw properties of recycled concrete (RCA) and asphalt (RAP) as unbound base and to assess how they behaved in the field for nearly 8 years. This paper includes an examination of existing information, laboratory studies of freeze-thaw behavior, and evaluation of data from MnROAD field-test sections in a seasonally cold region, i.e., in Minnesota, USA. Test sections were constructed using recycled materials in the granular base layers at the MnROAD test facility. One test section included 100% RAP, another 100% RCA, a third one a 50/50 blend of RCA/natural aggregate, and a fourth one only natural aggregate (Class 5) as a control. The stiffness (i.e., elastic modulus) was monitored during construction and throughout the pavement life by the Minnesota Department of Transportation, along with the variation of temperatures and moisture regimes in the pavement to determine their effects on pavement performance. The resilient modulus of each material was determined by bench-scale testing in accordance with NCHRP 1-28a, as well as by field-scale tests incorporating a falling-weight deflectometer. Specimens were subjected to as many as 20 cycles of freeze-thaw in the laboratory, and the change in their resilient modulus was measured. In the field-test sections constructed with the same materials as the base course, temperature, moisture, and field modulus (from falling-weight deflectometer tests) were monitored seasonally for nearly 8 years. From the temperatures in the base course layer, the number of freeze-thaw cycles experienced in the field was determined for each test section. Inferences were made relative to modulus change versus freeze-thaw cycles. Conclusions were drawn for long-term field performances of the recycled base (RAB) in comparison to natural aggregate.  相似文献   

陷落柱中“止水塞”的快速建立技术   总被引：2，自引：0，他引：2  

郑士田  马培智 《煤田地质与勘探》1998,26(3):51-53

论述了通过注浆在特大型垂向导水通道——陷落柱中建立人工"止水塞"的技术与途径,即"止水塞"位置选择、厚度计算、注浆钻孔的施工工艺、注浆施工工艺、"止水塞"检查、完善与加固方法,并通过实例说明该项技术的实用性和可推广性。   相似文献