共查询到20条相似文献，搜索用时 62 毫秒
1.
女34断块水平井提高采收率开发实践 总被引：1，自引：0，他引：1
舍女寺油田女34断块是大港油区典型的低渗透块状砂岩断块油藏，由于储层严重的非均质性，注水开发见效快、水淹快，并且形成油藏次生底水，作为水平井技术改善低渗透油藏开发效果的先导试验区块，经过深入地质研究和可行性论证，又相继完钻2口水平井，同时进行注采井网调整，编制了水平井和直井采油、直井注水的混合外网调整方案，方案实施后，断块采油速度由0．6％提高到2．6％，采收率提高8个百分点，开发效果显改善，实践证明水半井技术是改善低渗透非均质断块油藏开发效果的有效手段之一。 相似文献
2.
3.
鄂尔多斯盆地NNW油区主力油层为三叠系延长组长6和长4+5层段,为河流相和湖相三角洲透镜状和部分席状砂体叠加而成,属于超低渗透率的致密砂岩非常规油藏。NNW油区老井侧重于单个砂体的开发,油层打开程度不完善大大降低了采油速度。通过使用椭圆锥泄油模型模拟,发现油井泄油半径小于50 m,井间存在大量剩余储量。研究提出使用多油层组合、分段压裂取代单个砂体开发模式,将全井段油层及油水同层一次压裂完井。同时提出利用水平井开发方式对NNW油区进行再次开发,水平井及分段压裂具有成倍提高油区产量和经济效益的潜力。通过分析发现油区具有再次开发的良好资源条件。 相似文献
4.
针对低渗透油藏直井井网CO2驱油的不足,以大庆某低渗区块为例,建立反七点水平井井网CO2驱油地质模型。在物性参数相态拟合的基础上,对反七点水平井和五点直井两种不同井网模式的开发效果进行了对比,对反七点水平井井网参数进行了优化,同时对储层非均质(渗透率、储层非均质性、裂缝的发育情况等)进行了影响因素分析。研究表明：利用水平井注CO2可以适当地增大井距、排距,减少井的数量,降低钻井成本;在生产制度相同的情况下水平井井网的开发效果要比直井井网的开发效果好;在水平井井网中,采出程度随着油井到水平井的垂直距离的比值变化而变化,当比值为1.4时采出程度最大;水平井注CO2更适合低渗透正韵律储层;在储层裂缝发育的情况下,裂缝条数越多,CO2在储层中的不均匀推进现象越明显,最终采出程度越低。 相似文献
5.
水平油田石炭二叠系油藏为一受平缓角度不整合面控制的高角度层状不整合油藏,其主力油层为上古生界二叠系上石盒子组奎山、万山含砾石英砂岩段。油层含油高度低,单层厚度小,地层倾角大,在平面上呈窄条带状分布,油田勘探、开发难度大。利用水平井的“切顶穿越”技术,把水平轨迹设计在平缓不整合面下、垂直于高倾斜储层的走向,最大限度地发现了油层,降低了勘探风险。通过水平井预探、评价,优选主力开发单元,并经精细油藏描述 相似文献
6.
7.
深部煤层渗透性普遍较差,直井压裂开发单井产量低效果不甚理想,而U型水平井分段压裂开发煤层气技术已取得很好的效果。该项技术试验前必须进行适合该井型的地质评价。以鄂尔多斯盆地东缘延川南区块为例,首先分析影响水平井压裂产能的地质因素,主要为单井控制资源量、储层渗透性和煤层气解吸难易程度,其中单井控制资源量受含气量和煤层厚度影响,渗透性与煤层埋深、构造及煤体结构等有关,碎裂煤发育区渗透性相对好。而后假定吸附性能不变的前提下,利用数值模拟方法分别模拟了不同渗透率、含气量和煤层厚度条件下水平井压裂的产气情况,模拟结果表明水平井压裂后累计产气量与渗透率、含气量、煤层厚度正相关。最后在经济效益评价的基础上,查明适合水平井压裂的地质条件:渗透率>0.25×10–3μm2,含气量>12.3m3/t,煤层厚度>2.9m。该地质适用性评价标准在现场得到广泛应用,并收到了良好的开发效益。 相似文献
8.
涪陵页岩气田是我国第一个投入商业化开发的国家级页岩气示范区,与北美相比,涪陵地区地表条件、地质条件和页岩气储层特征更加复杂、储层埋藏更深,开发初期钻井机械钻速低、钻井周期长、成本高。为此开展了涪陵页岩气田水平井组优快钻井技术研究,形成了集水平井组钻井工程优化设计、水平井优快钻井技术、国产低成本油基钻井液、满足大型压裂要求的长水平段水平井固井技术、山地特点“井工厂”钻井技术以及绿色环保钻井技术为核心的页岩气水平井组优快钻井技术体系。在涪陵页岩气田推广应用了290口井,完井256口,平均单井机械钻速提高了182%,平均单井钻井周期缩短了55%,平均单井钻井成本降低了34%。为涪陵页岩气田年50亿m3一期产能建设的顺利完成提供了强有力的技术支撑,对我国页岩气规模开发提供了重要的借鉴和引领作用。 相似文献
9.
80年代初，水平井显著的增产效果已引起石油界广泛关注。90年代中期，塔里木盆地开始应用水平井，到1999年底，塔里木盆地有塔河、阿克库勒（桑塔木）、西达里亚（解放渠东）、塔中4、塔中16、轮南等油田应用了水平井，共钻水平井36口，主要针对边、底水沙岩油藏，2000年开始偿试在裂缝性碳酸盐岩油藏中应用水平井。1 塔里木盆地水平井开发效果评价 水平井开发效果评价主要是用水平井与地质条件等同的直井进行对比分析，水平井与直井具有相同油层厚度，从临界产量、初产、无水期、无水采油量、采油指数、含水上升率等方面进行对比分析。塔河… 相似文献
10.
有效厚度是储层测井解释的一个重要组成部分,其中有效厚度下限的确定对划分有效储层具有关键性的作用,包括电性下限和储层的物性下限.以安塞油田某区长6油层组为例,通过岩心分析资料,地质录井、化验分析及邻井的试油试采资料综合分析,认为长6属于典型的低孔低渗油层.岩性、物性的差异控制着储层油藏的富集程度,确定储层物性下限的标准:孔隙度为7％,渗透率为0.1mD;电性下限的标准:电阻率为14Ω·m,声波时差为219μs/m.利用有效厚度的物性、电性下限和夹层的扣除标准,划分单井的有效厚度,提高目的层段油藏测井解释和有利区预测的精度. 相似文献
11.
Emily Keeble David I. Whiteside Michael J. Benton 《Proceedings of the Geologists' Association. Geologists' Association》2018,129(2):99-119
Pant-y-ffynnon Quarry in South Wales yielded a rich cache of fossils in the early 1950s, including articulated specimens of new species (the small sauropodomorph dinosaur Pantydraco caducus and the crocodylomorph Terrestrisuchus gracilis), but no substantial study of the wider fauna of the Pant-y-ffynnon fissure systems has been published. Here, our overview of existing specimens, a few described but mostly undescribed, as well as freshly processed material, provides a comprehensive picture of the Pant-y-ffynnon palaeo-island of the Late Triassic. This was an island with a relatively impoverished fauna dominated by small clevosaurs (rhynchocephalians), including a new species, Clevosaurus cambrica, described here from a partially articulated specimen and isolated bones. The new species has a dental morphology that is intermediate between the Late Triassic Clevosaurus hudsoni, from Cromhall Quarry to the east, and the younger C. convallis from Pant Quarry to the west, suggesting adaptive radiation of clevosaurs in the palaeo-archipelago. The larger reptiles on the palaeo-island do not exceed 1.5?m in length, including a small carnivorous crocodylomorph, Terrestrisuchus, and a possible example of insular dwarfism in the basal dinosaur Pantydraco. 相似文献
12.
The effect of water on accessory phase solubility in subaluminous and peralkaline granitic melts 总被引：4，自引：0，他引：4
The solubilities of columbite, tantalite, wolframite, rutile, zircon and hafnon were determined as a function of the water contents in peralkaline and subaluminous granite melts. All experiments were conducted at 1035 °C and 2 kbar and the water contents of the melts ranged from nominally dry to approximately 6 wt.% H2O. Accessory phase solubilities are not affected by the water content of the peralkaline melt. By contrast, solubilities are affected by the water content of the subaluminous melt, where the solubilities of all the accessory phases examined increase with the water content of the melt, up to 2 wt.% H2O. At higher water contents, solubilities are nearly constant. It can be concluded that water is not an important control of accessory phase solubility, although the water content will affect diffusivities of components in the melt, thus whether or not accessory phases will be present as restite material. The solubility behaviour in the subaluminous and peralkaline melts supports previous spectroscopic studies, which have observed differences in the coordination of high field strength elements in dry vs. wet subaluminous granitic glasses, but not for peralkaline granitic glasses. Lastly, the fact that wolframite solubility increases with increasing water content in the subaluminous melt suggests that tungsten dissolved as a hexavalent species. 相似文献
13.
Muriel Rocher Stéphane Baize Stéphane Jaillet Edward Marc Cushing Yannick Lozac&#x;h Francis Lemeille 《Comptes Rendus Geoscience》2003,335(8):701-708
Calcite samples were extracted both from the rock matrix and the superficial coating of a karstified fault plane of an underground quarry, located in the eastern border of the Paris basin. The karstification is dated as Quaternary. Analysis of mechanical calcite twinning reveals that only the calcite matrix has also undergone a compression trending WNW that can be attributed to the Mio-Pliocene alpine collision. Both coating and matrix have undergone a strike-slip regime with σ1 roughly trending north–south, that could correspond to the regional present-day state of stress, a strike-slip compression rather trending NNW, modified by local phenomena. To cite this article: M. Rocher et al., C. R. Geoscience 335 (2003). 相似文献
14.
正20141756 Chen Ruige(Mathematical College,China University of Geosciences,Beijing100083,China);Zhou Xun Numerical Simulation of Groundwater Level Fluctuation in a Coastal Confined Aquifer with Sloping Initial Groundwater Level Induced by the Tide(Geological Bulletin of China,ISSN1671-2552,CN11-4648/P,32(7),2013,p.1099-1104,6 illus.,16 refs.) Key words:confined water,groundwater level 相似文献
15.
正20141408 Cai Jia(Institute of Geology,Chinese Academy of Geological Sciences,Beijing100037,China);Liu Fulai Petrogenesis and Metamorphic P-T Conditions of Garnet-Spinel-Biotitebearing Paragneiss in Danangou Area,Daqingshan-Wulashan Metamorphic Complex Belt(Acta Petrologica Sinica,ISSN1000-0569,CN11-1922/P,29(7), 相似文献
16.
17.
正20142386An Guoying(China Aero Geophysical Survey and Remote Sensing Center for Land and Resources,Beijing 100083,China)Application of Satellite Remote Sensing in Regional Hydrogeological Investigation:Taking Cenozoic Strata in Wenquan Sheet(1∶250 000)of Karakoram Range as an Example(Geosci- 相似文献
18.
正20141016An Chengbang(Key Laboratory of Western China’s Environmental Systems,Ministry of Education,Lanzhou University,Lanzhou 730000,China);Zhao Yongtao Lake Records during the Last Glacial Maximum from Xinjiang,NW China and Their Climatic Impli- 相似文献
19.
正20141538 Cao Qing(School of Earth Sciences and Engineering,Xi’an Petroleum University,Xi’an 710065,China);Zhao Jingzhou Characteristics and Significance of Fluid Inclusions from Majiagou Formation,Yichuan Huangling Area,Ordos Basin(Advances in Earth Science,ISSN1001-8166,CN62-1091/P,28(7),2013,p.819-828,7 illus.,3 tables,43 refs.) 相似文献
20.
正20142002 Wei Hualing(Institute of Geophysical and Geochemical Exploration,Chinese Academy of Geological Sciences,Langfang065000,China);Zhou Guohua Element Content and Mineral Compositions in Different Sizes of Soil in Tongling Area,Anhui Province(Geological Bulletin of China,ISSN1671-2552,CN11-4648/P,32(11),2013,p.1861 相似文献