共查询到18条相似文献，搜索用时 421 毫秒
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根据沙一油藏的物性特点，开展了CO2驱研究，室内进行了地层原油相态、压力组分、注CO2压力等实验。为了确定合理的开采方式，进行了连续注CO2、水气交替注入等实验研究。室内实验表明，在沙一油藏进行CO2驱是可行的。在室内模拟和CO2驱替实验的基础上，在现场开展了矿场试验。通过在濮1—1井进行试验，井组取得了好的效果，日增油8．5t，累积增油1150t。这为下步濮城油田高含水油藏进一步提高采收率提供了新的途径。 相似文献
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针对目前胜利油区埕岛油田单井液量低、产油量低的问题展开提高采液量研究。应用油藏工程和数值模拟等方法，研究了该油藏的提液潜力和适合该油藏的提液时机及提液条件。研究结果表明：油藏具备提液的潜力和提液条件，在含水达到70％～80％时提液效果最佳，提液条件是恢复地层压力到原始压力的0．85倍，恢复压力的最佳注采比为1．1，提液最大生产压差为3．5MPa。矿场应用取得了提液增油的明显效果，对海上同类型油田提高注水开发效果具有积极的指导意义。 相似文献
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“薄散弱”油藏由于其油层薄、砂体小、分布零散、天然能量弱,采用定向井难以经济有效开发;采用水平井开发虽可提高单井初期产量,但由于地层能量不足,产量递减快,无法从根本上解决采收率低的问题;注水开发虽能解决地层能量不足问题,但海上注水要增加设备、平台空间及平台重量,相应地增加开发成本,加上其储量规模小,经济效益难以保证.以X油田H4油藏为例,在储层精细描述的基础上,提出并实践了多底多分支水平井技术与地层自流注水技术,实现了“薄散弱”油藏的经济有效开发,并取得了较好的开发效果.其实践成果对类似难动用储量的经济有效开发具有借鉴和参考意义. 相似文献
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受低幅度构造、地层倾角小、储层渗透率低、油源供给不足等因素影响,油层中存在自由水,若整个开发层系的油层大面积内均为油水同层,则称为低含油饱和度油藏。低含油饱和度油藏油井投产初期就具有一定含水率。由于室内岩心试验获得的油水相对渗透率曲线是在饱和油情况下进行,因此,油田实际含水与采出程度和利用室内试验曲线计算出的理论含水与采出程度曲线不能较好吻合,当油藏原始含水饱和度较高时这种误差会很大,导致含水与采出程度理论曲线无法正确预测油藏含水上升规律。根据试验获得的相渗曲线和实际生产数据,采用试验数据与生产实际相互印讧的方法,修正油藏含水上升规律,计算油藏原始含水饱和度,解决了油藏原始含油饱和度计算以及具有原始含水饱和度油藏含水上升规律预测问题,对正确认识油藏和开发指标预测具有重要意义。 相似文献
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针对目前锦州9—3油田高含水期开发现状，应用油藏工程方法，从开发效果评价指标体系入手，对注入倍数增长率、水驱指数、存水率、综合含水等指标进行了客观分析，适时监测油田开发动态，及时发现油田存在主要问题，为全面了解油田开发状况，进行下步调整挖潜提供理论依据。评价结果表明，该油田注水开发过程中，在提液稳油、追求上产的同时，控水措施没有及时跟上，导致含水上升较快。但2004年以后的历次开发调整措施发挥了较好的作用，起到了稳油控水的效果。在今后开展稳油措施的同时，建议进一步加强找、堵水等控水工作，以保证开发效果向好的方向发展。 相似文献
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水溶解气对水驱气藏开采动态的影响 总被引：2，自引：0，他引：2
水溶解气的释放能对气藏的开采动态产生一定的影响。在理论分析的基础上,首次提出了计算水溶解气饱和度和水溶解气释放产生的水侵量的计算公式。并通过实例分析证实,在有水气藏的开发过程中,水溶解气的贡献应该引起足够的重视。随着采出程度的提高或地层压力的下降,水溶解气的贡献均呈逐渐增大的趋势。只有水体很小(≤0.01)或很大(≥50)时,才能忽略水溶解气的影响(<2.6%)。0.5～2倍水体的影响最大,对水侵量的贡献可达39.25%。随着地层压力的下降,水溶解气饱和度逐渐增大,当地层压力小于原始地层压力的25%左右时,水溶解气饱和度迅速增大。但是,由于地层压力往往难以降到原始地层压力的10%以下,所以,最大水溶解气饱和度一般不会超过10%。在水溶解气饱和度达到临界气饱和度以前,水中的溶解气并不能流动;但是,会减缓地层压力的下降速度。与天然气原始地质储量相比,虽然水溶气储量的规模较小,但是由于天然气具有较大的压缩性,当地层压力降至一定程度时,水溶气膨胀对水侵作用的影响力不可忽略,应该与压差和采气速度同时予以考虑。 相似文献
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The CO2CRC Otway Project is the first demonstration scale project for geosequestration of CO2 in Australia. The storage site is located in the depleted Waarre reservoir of the Naylor gas field contained within a single fault block, in the onshore Otway Basin of Victoria. During 2009, approximately 65,000 tonnes of a mixture of CO2 and CH4 (∼80%/20%) was injected into the reservoir, accumulating at the top of the structure.To fully understand the pressure response of a depleted reservoir to CO2 injection all of the mechanisms that may impact the reservoir pressure, prior to injection, must be identified. In the case of the Otway Project there were five possible mechanisms with potential for impacting the Naylor Field pressure. These are (1) the rate of recovery due to gas production from the Naylor Field; (2) depletion from the nearby Boggy Creek CO2 production field; (3) depletion from the nearby Buttress CO2 Field, the source of the CO2 for injection into the Naylor Field; (4) depletion from the regional Waarre Formation reservoir which has been producing gas (and water) since 1986; and (5) hydraulic potentiometric disequilibrium via connection to other active aquifers.These mechanisms were examined through a regional conceptual hydrodynamic model as part of the pre-injection site characterisation. The reservoir pressure measured at the Naylor-1 well, prior to production, was lower than predicted by the hydrodynamic model. Examination of regional drawdown demonstrated that the reservoir is experiencing pressure decline which could have extended to the Naylor Field at this time.Ongoing monitoring of the Naylor-1 well, prior to injection, showed the depleted reservoir recovering faster than predicted by the reservoir simulation model matched to the production history. Connecting the target fault block to the regional aquifer using a dual aquifer model supported by the hydrodynamic model significantly improved the predicted recovery of the depleted reservoir. 相似文献
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Mercury injection capillary pressure (MICP) is a commonly-used technique for measurements of porosity, pore throat size distribution, and injection pressure vs. mercury saturation for many types of rocks. The latter two are correlated to and can be used to estimate permeability. Problems for MICP application in mudrocks are associated with two types of system errors: conformance and compression effects. These two sources of error are well-recognized, but no standard procedures to correct them exist. In this study, a new method for conformance and compression corrections was developed, and the method applied to five Eagle Ford Shale samples. Conformance correction is based on comparison of mercury injection volume vs. pressure curves between epoxy-coated and uncoated samples. Compression correction is based on calculation of compressions before and after mercury intrusion in MICP experiment. Different types of compressions are quantified and compression corrections on porosity, pore throat size distribution, and injection pressure vs. mercury saturation are performed. Porosity and permeability were calculated based on corrected MICP data. Results show that both conformance and compression corrections are important for accurate MICP porosity calculation, whereas conformance correction is more important than compression correction in permeability calculation. 相似文献
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The purpose of this study is to investigate the scale and load distribution of three-dimensional active earth pressure and the load transferred to the adjacent soil by changing the aspect ratio of a retaining wall through a series of model tests. In this research, 42 earth pressure plates of different heights and widths were installed to evaluate the earth pressures by considering the wall aspect ratio and the change of earth pressure. The test results showed that the active earth pressures were uniformly converged when the percentage of limit displacement against wall height was 0.12%. The distribution of active earth pressure on the wall showed a parabola shape for most aspect ratios while the wedge shape identified by the model test was similar to the shell-shaped model. In this paper, two diagrams were proposed regarding the active earth pressure according to the aspect ratio of a retaining wall; (1) a diagram of earth pressure conversion against the aspect ratio based on evaluated three-dimensional active earth pressures with traditional two-dimensional earth pressures, (2) a load transfer diagram based on the horizontal distance by analyzing the horizontal and vertical load transfer ranges with the relevant increasing rates. 相似文献
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Investigation of three-dimensional active earth pressure and load transfer according to aspect ratio
ABSTRACTAlthough there is a noticeable difference between two-dimensional and three-dimensional earth pressures, most researchers have suggested various earth pressure theories under the two-dimensional condition. Only a few studies have been conducted on the three-dimensional load transfer to the adjacent ground, whereas most studies in literature on the three-dimensional active earth pressure have been conducted by focusing on the stability of active wall. For accurate prediction of the three-dimensional active earth pressure, it is required to study not only the three-dimensional earth pressure distribution but also the three-dimensional load transfer to the adjacent ground. In this paper, size and distribution of the three-dimensional active earth pressure as well as the load transfer according to aspect ratio of retaining wall are investigated through a series of model tests. As a results, the three-dimensional active earth pressure distribution showed the highest value at the wall height of 0.5–0.55h when the aspect ratio of equal to 1.2 or higher. The load transfer showed higher values in vertical direction than horizontal direction. The load transfer distribution can be evaluated by applying the size and effect range of the loads transferred to the adjacent soil of the retaining wall. 相似文献
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牙鲆迟缓爱德华氏菌急性感染实验:4种不同方法的比较 总被引：3，自引：0，他引：3
为了检验疫苗对牙鲆免疫效果，探讨有效的注射途径尤为重要，本文通过采用迟缓爱德华氏菌(Edwardsiella tarda)对牙鲆（Paralicthys oliwaceus)进行感染实验，对口腔、肌肉、腹腔和腹腔加肌肉４种注射方法了评价比较，其半致死浓度（ＬＤ５０）分别为口腔灌注法１０^8.38 CFU/ml、肌肉注射法１０^7.54CFU/ml、腹腔注射法１０^6.70CFU/ml和腹腔加肌肉注射法１０^6.09CFU/ml。结果表明牙鲆对迟缓爱德华氏菌敏感，在这４种注射方法中，以腹腔注射法这种人工方式最佳。 相似文献
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A油田属于小而肥的高品位油田，埋藏浅、油层单一、胶结疏松、高孔、高渗、稀油、边水活跃、初期产量高，但是原油中含蜡量高达6％左右，开采过程中结蜡容易造成自喷井油嘴堵塞、机抽井卡光杆、地面管残堵塞而影响正常生产。通过开展恒温溶蜡实验，矿场总结单井结蜡规律，采取区别对待，根据油压、套压、回压变化，对自喷井检查油嘴、启抽、热洗井筒及地面管线、机械刮蜡等有效措施，投入开发三年以来没有一口井和一条管线发生过蜡卡事故，油井生产平稳有序，集输管线安全畅通，以甲方12人的经营团队累积产油72×10^4t，采收率50％，自然递减为-7％，综合含水仅1．6％。 相似文献
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《Ocean Engineering》2004,31(3-4):253-267
Artificial air cavity ship concept has received some interest due to its potential on viscous resistance reduction for high speed craft. Although a small number of ships were designed and built by using this concept, further research on resistance components is required to improve the understanding of artificial air cavity forms. A method based on tank testing with wave pattern measurements to identify resistance components was adopted in the current work. Resistance tests were conducted with two forms; first of which was conventional prismatic planing hull form with a deadrise angle of 10°, and second one was an alternative form with an artificially cavity which was tested both without any air injection, and with two different air injection rates.Total resistance, running trim, sinkage, supply airflow to artificial cavity, air pressure in the cavity and wave pattern generated by the hulls were measured. Frictional resistance was calculated from wetted surface area and compared with resistance component obtained by subtracting wave pattern resistance from the total resistance. Wave pattern spectrums with air cavity configurations were compared across the speed range. 相似文献
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Geohistory analysis of Bombay High region 总被引：1，自引：0，他引：1
Madan Mohan 《Marine and Petroleum Geology》1985,2(4):350-360
Geohistory diagrams have been constructed for three representative sites in the Bombay High region, Offshore West-Coast India. The model curve for 60% lithospheric injection matches the intitial part of a thermo-tectonic curve for one of the sites, where a complete Tertiary sequence is developed. The study suggests that the four Paleogene unconformities, recognised in this region, were caused by eustatic falls. A distinct phase of active subsidence occurred during the late Middle — Late Miocene, probably due to more active spreading at the Mid-Indian Ocean Ridge. 相似文献