共查询到19条相似文献,搜索用时 234 毫秒
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低渗透油藏注水开发存在问题分析 总被引:1,自引:0,他引:1
针对目前低渗透油田注水开发存在注水井注入压力上升快、吸水能力变差,采油井产量下降快、采收率低的一些突出问题,分析了产生这些问题的主要原因。研究表明,由于注入水水质问题、储层的敏感性、开采过程中储层有效应力增加以及低渗透油藏过度压裂造成注入水沿裂缝窜流等是造成低渗透油藏注水开发效果差的主要原因,并且储层伤害具有动态性、叠加性和不可恢复性。低渗透油藏注水开发中,应注重注水水质精细处理和注入水与地层水的配伍性,合理控制注采速度,保持地层能量,优化压裂方案,避免因过度压裂引起的注入水窜流,不能有效地开采基质中的剩余油。 相似文献
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注水开发,即油藏二次采油,是在利用天然能量第一次采油后运用得最多的一项提高采收率的方法,提高油田效益。在注水开发过程中。需要对油田注水前后储层的变化情况、注水效果、水注入方向等进行动态分析,运用分层动态分析技术、不稳定注水技术等调整开采方案,以达到更好的开发效果,提高经济效益。 相似文献
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HH油田属于典型的低孔特低渗储层油田。注入水与储层流体的配伍性对注水开发方案设计极为重要。通过开展HH油田注入水与C8、C9储层地层水的水质测定、结垢趋势预测和静、动态配伍性实验以及注入水与储层原油的配伍性实验,明确了HH油田注入水与C8、C9储层流体配伍性。结果表明,HH油田注入水与C8、C9地层水不配伍,存在碳酸钙垢趋势,且随着注入水比例的增加、温度的升高,碳酸钙结垢越严重,注入水与地层水比例为9∶1时结垢指标SI值为2.354,SAI值为2.873,结垢程度严重;注入水与地层原油之间配伍性良好。该研究结果对HH油田注水水质指标标准制定、注水开发方案制定及水质处理等研究提供了依据。 相似文献
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子北油田黄家川1068区块初期依靠地层能量开采,产量递减较快.本文对研究区开发初期的油井自然能量的动态分析,储层的润湿性评价、岩心驱油试验和敏感性评价,以及注入水与地层水的配伍性评价进行了分析,研究结果表明:子北油田1068注水区块中长61储层呈现出较弱酸敏性、较弱碱敏性、无水敏性、中等盐敏性、中等偏弱速敏性,并具有亲水的特征.因此,采用注水开采是行之有效的方案,而且在注水开采时可以忽略速敏、酸敏和碱敏对储层的影响,但是当地层水与注入水配伍性较差时需考虑盐敏的影响. 相似文献
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《中国石油和化工标准与质量》2013,(21)
油田注水保持压力是确保油田长期稳产、提高油田开发效果的有效途径。高效的注水系统能够节约水资源、降低注水成本,对提高注水井储层注水效率技术的研究对油田开发具有重大意义。基于前人对井底完井与储层渗流的研究,本文提出了一种新的注水效率评价标准,对储层注水效率提高潜力合理评价,可以为储层选择针对性的改造措施提供了理论依据。 相似文献
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《中国石油和化工标准与质量》2013,(16)
新木油田木南区块属复杂的断块油田,储层主要为粉细砂岩,粘土矿物含量较高,储层胶结物含量高。长期注入不合格水必然引起粘土膨胀、分散运移,降低油层渗透率。注水开发是保障油田稳产的主要手段之一,有效注水合格率是油田开发管理的重要指标,有效注水合格率的高低直接决定油田开发效果的好坏。为了进一步提高有效注水合格率进而改善油田开发效果,针对新木油田木南有效注水合格率较低这一实际,历时一年,分析现状、查找要因、现场实践、深入分析,针对问题开展活动,完成了预定的活动目标,取得了较好的效果。 相似文献
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M. M. Amro A.‐A.H. El‐Sayed E. S. Al‐Homahdi M. A. Al‐Saddique M. N. Al‐Awad 《化学工程与技术》2002,25(10):1005-1013
Blocking or reducing water production from oil wells is a serious problem in oil industry. Two types of polymers, namely, polyacrylamide (PAA) and polysaccharides (xanthan) have been investigated in this paper. The viscosity of both polymer solutions was first evaluated at different salinities, shear rates and concentrations. Afterwards, the solutions were injected into core samples to examine the adsorption on the rock surface by calculating the resistance factor as well as the residual resistance factor. Also, the effect of the injection rate of the polymer solutions has been studied. The results show that xanthan solution is tolerant of high salinity (20 %), while PAA solution is very sensitive to salt. Both polymer solutions show a pseudoplastic flow as a function of the shear rate. The core sample experiments show that both polymer solutions suffer a reduction in the adsorption rate with salinity increase. However, xanthan shows acceptable values even with a salinity up to 20 % and a temperature of 60 °C. Therefore, xanthan can be recommended to shut off water in high salinity and high temperature reservoirs. It was also found that the lower the injection rate the higher the adsorption on the rock surface. 相似文献
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为揭示注入水对地层油高压物性的影响规律,采用从油田获取的油、气、水样品,开展了不同含水百分比条件下地层流体高压物性模拟实验。结果表明:随着水或聚合物溶液的注入,模拟地层油的饱和压力和溶解气油比都降低,且降低的幅度随含水百分比的增大而增大。当含水百分比为80%时,注水使模拟地层油的饱和压力降低10.33%、溶解气油比减小16.00%,注聚合物溶液使模拟地层油的饱和压力降低8.75%、溶解气油比减小12.93%。不同含水百分比条件下,注水时气水比平均值为2.09 cm3/g,注聚时气水比平均值为2.01 cm3/g。注入水进入油藏与地层油充分接触后会从油相夺取部分气体成为含气水。 相似文献
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中国石油大庆石化分公司化工一厂乙烯装置裂解气压缩机通过采取压缩机级间注水、中压缸注洗油、注入阻聚剂的方法,降低段间排出温度,减缓机组结焦速率,达到延长裂解气压缩机长周期运行的目的。文中分别对压缩机注洗油和注水进行了分析探讨,意在通过探索,更大程度减缓机组结焦速率,提高机组运行周期。 相似文献
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注蒸汽热采技术研究进展 总被引:1,自引:0,他引:1
在研究大量文献的基础上,总结了注蒸汽采油的机理,概述了稠油注蒸汽热采的研究现状与发展趋势,着重探讨了稀油注蒸汽热采的应用前景、研究现状以及稀油注蒸汽热采还需要深入研究的课题。研究认为:稠油注蒸汽热采已是比较成熟的技术,在稠油开发中占有重要的地位,其发展趋势为利用天然气、溶剂、高温泡沫、聚合物等来改善注蒸汽热采效果;稀油油藏水驱、聚驱后转注蒸汽热采具有可行性,今后需重点解决的问题包括采用煤或核能生产蒸汽、采用水汽交注、蒸汽泡沫等方法提高稀油油藏注蒸汽热采的采收率。 相似文献
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油田注水开发中后期,受地层非均质性影响,注入水沿高渗透层突进,波及中低渗透层程度低,水驱开发效果差。对注水井的吸水剖面进行调整,可改善开发效果。针对孤东油田储量动用程度高、水淹严重、剩余油高度分散、稳产难度大的严峻形势,系统开展调剖技术提高采收率的研究。选定一个具有代表性的典型注水井组GO7-22X3255,以颗粒、凝胶、颗粒和凝胶为调剖剂,通过对调剖剂注入的质量浓度,注入速度和注入量进行调剖方案设计,比较了三种注入方案下的软件数值模拟结果与现场实际效果,得出对井组GO7-22X3255以注入颗粒质量浓度为3 mg/L时效果最理想的结论。 相似文献
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Somenath Ganguly 《Chemical Engineering Research and Design》2011,89(11):2380-2388
Water is injected into oil-bearing porous rock for displacement of oil. Water tends to flow through high permeablity streaks, leaving significant amount of oil in place, unless the streaks are plugged by structure-forming fluids such as, polymer–gels. Cr(III)–polyacrylamide gel finds an use even in production well, as this gel structure offers easy flow of oil, apart from restricting water flow. The resistances that water and oil encounter, while flowing through the gel structure are characterized in this paper.The permeability of Cr(III)–polyacrylamide gel, held in tubes was evaluated as function of oil and water flow rates. This was observed that immediately after the rupture, a new pore space was created by the injected fluid. Same pathways were used by the other phase, i.e., water or oil, injected subsequently. The volume of the pathway within the gel structure was also monitored during the flow experiments. After complete recovery of the new pore space, the permeability was found to increase at higher flow rates. The change in permeability was completely reversible, and a cycle of step-wise ascent and descent in flow rates did not show any significant hysteresis. A theoretical model is developed that accounts for the rupture in the gel, and the deformation of the fracture inside the gel due to imposed pressure gradient. The model explains the power-law relationship between permeability and flow rate, as observed in experiments. The model identifies a ratio of interfacial to elastic deformation, in terms of a dimensionless parameter, σ/(GL). This ratio controls the relative reduction in water permeability with respect to the reduction in oil permeability. Experiments were conducted in Berea sandstone rock, and similar trends, as described above were observed. 相似文献