共查询到18条相似文献，搜索用时 609 毫秒
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酸化是解除该类储层伤害,恢复、提高油气井产能最主要的手段。对于各种特定的伤害类型若仅采用笼统的酸化措施,往往难以取得理想的增产效果,如何从伤害机理的角度出发对症解除污染是研究者面临的重要课题。NP油田Ed1储层在以往的酸化改造中,由于对钻井泥浆伤害机理认识不够准确,导致酸液选择存在较大的盲目性,严重影响解堵效果。为解决上述问题,提出酸化解堵设计方法,通过泥浆固相粒度和滤液红外波谱分析试验评价,明确了Ed1储层钻井泥浆伤害产生的机理。在此基础上,设计在同一组试验内先模拟泥浆伤害的产生,发现岩心伤害后渗透率降低至基准渗透率的0.12倍,然后比较评价不同类型的酸液解除该类泥浆污染的能力,最终筛选出解堵效果最好的4%多氢酸体系推荐现场施工使用。 相似文献
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东海油气资源丰富,其中低孔低渗储层的油气资源占比约2/3,勘探前景广阔。在勘探期间,偶尔见储层物性相对较好,低产的现象。为了明确储层低产的原因,改善储层的产能问题,研究发现水基泥浆对油气层有着不可逆的污染现象,为此东海推行油基泥浆新体系。在新泥浆体系下,测井和录井等资料采集的环境发生改变,油基泥浆环境下,油气层与水层的侵入现象与水基泥浆完全相反,油气层无侵入,水层侵入明显;录井中气测组分以及荧光信息受油基泥浆影响较大,气测组分容易被油基泥浆吸收,并且荧光信息混杂有泥浆荧光,因此,对油气水层识别及定量评价不能忽略油基泥浆带来的影响。本文对比不同泥浆环境下测录井资料解释方法的差异,为东海建立快速有效的油气识别方法提供依据。 相似文献
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在渤海湾盆地,由于沉积地层存在大段活性软泥页岩,普通聚合物钻井液体系的包被抑制能力不够,封堵能力不强,剪切稀释能力差,在钻遇该泥页岩井段时,经常出现井下复杂情况,并且油层受到一定程度的伤害。为此,研制了无土相强抑制性钻井液体系。从体系中处理剂的防塌抑制机理出发,确定了强抑制性钻井液体系构建的最优组合。研究结果表明该钻井液体系具有强的抑制性,岩屑滚动回收率达到95.6%,接近于油基泥浆;并且具有良好的润滑性、抗温性、抗钻屑污染、抗CaCl2污染、抗MgCl2污染以及良好的储层保护性能,渗透率恢复值能达到85%以上,能够满足大段软泥页岩等复杂地层的钻井要求,具有广阔的应用前景。 相似文献
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为满足恩平24-2油田水平井钻井工程和储层保护需要,通过实验研制出一种无固相快速弱凝胶钻井液体系.室内评价试验表明：该钻井液具有较高的动塑比和较高低剪切速率黏度（LSRV）,能有效克服水平井段携岩难、易形成岩屑床的问题.具有优异的抑制性和润滑性,且滤失量较小,具有较强的抗温、抗污染能力、井眼净化能力和储层保护能力.针对恩平24-2油田水平井采用裸眼完井工艺,研究了破胶剂JPC对钻井液及其滤饼的破胶性能,破胶剂JPC能有效解除聚合物对储层造成的污染.研究结果表明,该钻井液具有独特的流变性,维护简单,优异的储层保护性能和较好的可降解性,适用于恩平24-2油田水平井水平段的钻进. 相似文献
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通过对临近长峙岛一侧的海相吹填泥浆的物理化学及力学分析,结果表明:海相吹填泥浆的含水率高,初始孔隙比大,初始极限抗剪强度低;海相吹填泥浆含盐量高,且离子交换量偏大,致使微观颗粒被较厚的扩散水膜所包围;土粒骨架间的水膜较厚,各向异性的超载会加剧吹填料的体积变形,破坏粒间结构;天然状态下吹填泥浆的"片架-片堆"结构特征极为显著,微观-介观结构极不稳定,若盐类矿物出现降解、析出,其固相骨架将被局部化破坏。本文对舟山长峙岛海域的原位海洋土的研究可以了解吹填泥浆的性状,以期为真空预压排水固结技术用于区域内围海造陆工程提供科学依据。 相似文献
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大量的实验模拟计算需要知道天然气水合物的形成条件。可利用方程式来确定天然气水合物形成条件的数据。目前这种模式和等式的准确性取决于实验数据和理论值的准确性,二者相互依存。实验数据代表实际的物理条件,数据的获取较困难。虽然理论方法略有改变,但从宏观来讲实验方法和数据仍相对稳定。实验通常测试的是液相,而预测的是固相水合物。有关固相水合物实验数据的准确性很难完全通过实验阐述清楚,因为,固相天然水合物的测试遇到了不少困难,如流体堵塞、多相性、取样困难和固相样品描述等。在预测含低硫天然气和含微量CO2和/或H2S的天然… 相似文献
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《中国海洋大学学报(自然科学版)》2017,(9)
利用低温高压反应舱模拟海底水合物生成环境,采用原位拉曼光谱技术在线测定含水合物CH_4—H_2O体系中溶解甲烷的拉曼光谱,基于相关理论模型建立了溶解甲烷的拉曼光谱工作曲线(相关系数为0.999 77),定量分析了水合物形成后体系温度、压力对溶解甲烷浓度的影响。结果表明,拉曼光谱技术可准确测定溶解甲烷的浓度,实测溶解甲烷浓度值与理论计算值相吻合,相对误差小于5%。当体系中水合物形成后,温度对溶解甲烷的影响占主导作用,压力影响相对较弱,溶解甲烷浓度随温度升高显著增大,随压力升高而减小;而在气-液两相的情况下,温度与压力对体系内溶解甲烷浓度的影响正好相反。这很好地阐明了在天然气水合物稳定域内、外溶解甲烷浓度的变化特征。 相似文献
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珠江虎门潮汐水道水体中多环芳烃的分布及季节变化 总被引：14，自引：0，他引：14
采用GF/F玻璃滤膜对珠江虎门潮汐水道6个表层水样进行过滤分离出多环芳烃的颗粒相和溶解相,并根据美国EPA标准对多环芳烃进行了定量分析.结果显示,洪、枯季水体中16种优先控制多环芳烃总量分别是223～614,6 559～20 031 ng/dm3;洪、枯季多环芳烃总量分别为786～2 098,11 360～34 338 ng/dm3;广州前航道的污染较狮子洋严重.珠江虎门潮汐水道水体中多环芳烃的含量、分布具有明显的季节变化特征,枯季多环芳烃的浓度高于洪季1个数量级以上,且二环多环芳烃的含量占95%以上,主要呈溶解相形式出现;洪季高环多环芳烃的含量明显升高,主要呈颗粒相形式输运. 相似文献
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东海陆架北部泥质区沉积动力过程的季节性变化 总被引：4，自引：0，他引：4
利用东海陆架北部泥质区（济州岛西南）及其周围不同季节５个航次的悬浮体资料和相应的底质粒度资料,对该泥质区沉积动力过程的季节性变化规律进行了分析。结果表明：东海陆架北部悬浮体的高含量区并不与该区的沉积中心（泥质区）相吻合,泥质区的形成需有物源的充沛供应和涡旋的动力效应相结合。泥质区沉积作用时空变化具有强烈的季节性。冬季泥质区悬浮体供应充足,涡旋中心向泥质区东南扩展,是本区接受悬浮体沉积的关键季节。夏、秋二季泥质区的大部分区域缺少悬浮体物源,涡旋中心向北退缩,致使泥质区沉积作用强度降低,并且主要影响泥质区的西北区域。春季泥质区沉积作用强度和影响范围大于夏、秋两季,但小于冬季。 相似文献
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The series connection of multistage pumping module is the common concept of deepwater riserless mud recovery drilling system. In this system, the influence of the mass of pumping module on the vibration of mud recovery line cannot be ignored, and the lumped mass method has been utilized to discretize the mud recovery line. Based on the analysis of different boundary conditions, the paper establishes the axial forced vibration model of the mud recovery line considering the seawater damping, and the vibration model analysis provides the universal solution to the vibration model. An example of the two-stage pumping system has been used to analyze the dynamic response of mud recovery line under different excited frequencies. This paper has the important directive significance for the application of riserless mud recovery drilling technology in deepwater surface drilling. 相似文献
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Fluid and solid transfer in mud volcanoes show different cyclic phases of activity, including catastrophic events and periods of relative quiescence characterized by moderate activity. This is notably well-shown by the compilation of historical data onshore Trinidad. It appears that each eruptive mud volcano has its own period of catastrophic activity, and this period is variable from one volcano to another. The frequency of the eruptions seems essentially controlled by local pressure regime within the sedimentary pile. The dynamics of expulsion of the mud volcanoes during the quiescent phases has been studied with the help of temperature measurements within the mud conduits. The mud temperature in these conduits is notably concurrently controlled by the gas flux (endothermic gas depressurizing induces a cooling effect), and by the mud flux (mud is a vector for convective heat transfer). Complex temperature distribution was observed in large conduits and pools. Especially in the bigger pools, the temperature distribution characterizes convective cells with an upward displacement of mud above the deep outlet, and ring-shaped rolls associated with the burial of the mud on the flanks of the pools. In tube-like shaped narrow conduits, the temperature is more regular, but we observed different types of profiles, with either downward increasing or decreasing temperatures. Near constant to even negative gradients compared to the general temperature gradient are typical for very dynamic fluid systems. The temperature profiles varied from one place to another, as well as over time. The temperatures measured within the conduits and their base show that the fluid flow is not constant but highly variable through short time-periods. We observed locally a significant daily change of the temperature of the expelled mud which shows also that the mud flux is changing very rapidly due to the migration dynamics of the mud in fracture systems. We also observed very short time-period cyclic variations with a frequency of several minutes. These high frequencies temperature changes could be related to the dynamics of two-phase flows (gas and mud) through the mud volcano conduits. 相似文献
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Monty A. Hampton 《Marine Georesources & Geotechnology》2013,31(2):159-180
Abstract Fine‐grained sedimentary deposits on the Kodiak continental shelf and upper slope comprise three distinct compositional types: terrigenous mud, diatomrich mud, and ash‐rich sandy mud. The sediment types can be distinguished on the basis of geotechnical properties as well as by composition. The terrigenous mud has properties largely within the normal range for fine‐grained marine sediment, except for the low compressibility of many samples. This sediment underlies the walls of canyons that incise the upper slope, and analyses of undrained static and cyclic loading indicate potential instability in the steepest areas. The diatom‐rich mud has high water content, plasticity index, and compression index but low grain specific gravity. The ash‐rich sandy mud is nonplastic and has low water content and compressibility. It has high drained and undrained static strength but is extremely weakened by cyclic loading. Extensive deposits of sedimentary bedrock and coarsegrained glacial sediment in the region apparently are relatively stable, but low sediment strength or high compressibility may be encountered at the local sites of soft sedimentary deposits. 相似文献
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采用RT-PCR、RACE等方法,获得了拟穴青蟹PP2A调节亚基B(PP2A-B)的cDNA全序列,全长2040bp,开放阅读框(ORF)为1332bp,可编码443个氨基酸残基。同源分析显示,该基因编码的蛋白与其它一些物种具有很高相似性,推测PP2A-B基因具有很高的保守性。经荧光定量PCR检测,PP2A-B基因在拟穴青蟹多个组织中有表达,且在脑、卵巢、鳃中表达量较高。在拟穴青蟹卵巢发育过程中,PP2A-B基因在卵巢未发育期(I期)表达量最高,此后各期逐渐下降,推测PP2A-B在卵巢中可能以PP2A全酶的形式存在,抑制卵巢发育。 相似文献
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本文介绍了铝(Al)基牺牲阳极在青岛中港海鸥浮码头超期服役五年半的阴极保护情况。现场勘查结果发现少部分Al阳极是以"苞"状出现,暂命名为"阳极苞"。其外层为以苔藓虫(Bryozoa/Polyzoa)为主体的生物群落构成的具有一定强度的生物硬壳,内层为白色膏状物,暂命名为"阳极泥"。对生物硬壳进行了生物鉴定,利用扫描电镜(scanning electron microscope,SEM)测试其微观结构,红外光谱(infrared spectroscopy,IR)测定其化学组成,结果表明该生物硬壳由复杂的有机混合物组成,并且具有微米级多孔结构;对"阳极泥"进行了酸碱性测定、能谱分析(energy dispersive spectrometer, EDS)及X射线衍射(X-ray diffraction, XRD)分析,结果表明"阳极泥"主要由铝的水合氧化物和污损生物的代谢产物及机体分解产物组成。在此基础上初步讨论了"阳极苞"的形成过程及其对阴极保护的影响。 相似文献