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渤海K油田主力产层为沙河街组薄互层,1~2.7 m厚度的油层占总油层厚度的90%,采用定向井合采分注开发模式,针对开发初期已暴露出注水井层间、层内干扰较大,约70%注水井达不到配注要求的问题,采用油藏工程方法与数值模拟方法,通过机理模型以及复合油藏模型进行注水井最大注入压力优化研究,使注水井最大注水压力值得到有效提升,K油田注水井最大注水压力由15 MPa提高至25 MPa,且提压后注水井附近地层不会出现破裂,能确保安全生产。目前已在K油田23口注水井按最大注入压力25 MPa实施注水,全油田增加注水量为2 580 m~3/d,能满足油田高效开发需求。这表明,该研究结果对相似油田注水开发具有一定的参考价值。 相似文献
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欢北低渗透油藏是一个注水开发油藏,储层渗透率低、非均质强,注水井纵向上存在吸水严重不均的问题,严重限制了区块水驱开发效果的进一步提高。常规高压分层注水技术受井口压力高、层间级差大及单泵增注管柱蠕动加剧的影响,一直存在坐封压力高、分注有效期短及验封测试困难等问题。为改善注水井吸水剖面,提高储层动用程度,2012年以来开展了免释放测调联动高压分层注水技术的研究与应用,实现了高压注水井长期有效注水,油藏注水开发效果得到明显提高。 相似文献
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濮城油田已进入高含水开发期 ,各项生产指标下滑 ,面对严峻的现实 ,濮城油田迅速采取措施 ,开发新工艺、新技术。 1 998年经过工程技术人员的不断探索 ,开发研制出了以PI决策理论为依据的PI 1型注水井压降测评仪 ,通过阶段性应用 ,已经显示出其优越性 ,并创造了良好的经济效益。PI决策技术简介PI决策技术是应用注水井井口压降曲线计算所得的压力指数PI值解决区块整体治理问题的技术。注水井井口压降曲线是注水井关井后测得的井口压力随时间的变化曲线。注水井的PI值由注水井井口压降曲线算出。PI决策技术的理论基础是地层中微… 相似文献
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地层破裂状态下实施大排量污水回注技术研究 总被引:2,自引:0,他引:2
秘鲁1AB/8区块强天然水驱、特高含水老油田回注水量为170000m3/d,为了减少产出水的巨额投资,优选深部Pozo水层及Vivian油藏边部作为污水回注层位.这样既满足了环保要求,又可容纳大量回注污水.减少回注水中固体颗粒及残余油含量、增加注水射孔层段和射孔密度、减少注水管柱压力损失,可以保证大量污水回注的可持续性.根据计算的地层破裂压力,采用12~17.2MPa的井口注水压力可使注水地层破裂.对6口回注井实施大排量污水回注试验,单井注水量均超过6360m3/d.监测数据显示,地层在破裂状态下实现了低压大排量污水回注,提高了单井回注量,减少了设备投资.污水回注优化方案取得了良好的应用效果和经济效益. 相似文献
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河道砂油藏有着河道窄且长、地层能量下降快、河道中部物性好、边部物性差等特点,随着油藏注水开发的不断深入,注入水易延中部物性好、高渗条带舌进,使得同一井组井间水驱效果差异大,而水驱开发效果好坏直接影响着一个区块产量的高低。本文应用油藏数值模拟软件,建立河道砂油藏一注一采机理模型,从地质及工程方面提出影响河道砂油藏开发效果的影响因素,并具体解释目前河道砂油藏存在矛盾原因,为后续矿场生产提供理论支撑。 相似文献
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为了掌握地下储气库注气过程中的压力动态变化情况,解决持续注气导致的地层参数难以确定的问题,依据现场静、动态资料,基于一种改进粒子群优化算法,综合储层压力、井底压力和井口压力的计算方法,建立了一种地下储气库注气过程一体化压力及地层参数计算方法。首先,利用计算储层压力、井底压力和井口压力的方法计算出井口压力;然后,应用改进粒子群优化算法,不断调整、优化压力和地层参数,使计算的井口压力与实测井口压力达到最优拟合,进而得到储层压力、井底压力,以及储层平均渗透率、探测半径等地层参数。利用该方法计算了呼图壁储气库3口注采井的井口压力和储层的平均渗透率,3口注采井计算井口压力与实测井口压力的决定系数分别为0.988 9,0.989 3和0.978 4,计算出的储层渗透率与试井解释的渗透率基本一致,说明该计算方法的计算结果可靠。研究结果表明,利用地下储气库注气过程一体化压力及地层参数计算方法,可以了解地下储气库注气过程中的压力变化情况,有助于指导地下储气库的安全运行。 相似文献
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《Journal of Petroleum Science and Engineering》2000,25(1-2):59-77
The real-time detection of hydrofracture growth is crucial to the successful operation of water, CO2 or steam injection wells in low-permeability reservoirs and to the prevention of subsidence and well failure. In this paper, we describe propagation of very low frequency (1–10 to 100 Hz) Stoneley waves in a fluid-filled wellbore and their interactions with the fundamental wave mode in a vertical hydrofracture. We demonstrate that Stoneley-wave loses energy to the fracture and the energy transfer from the wellbore to the fracture opening is most efficient in soft rocks. We conclude that placing the wave source and receivers beneath the injection packer provides the most efficient means of hydrofracture monitoring. We then present the lossy transmission line model of wellbore and fracture for the detection and characterization of fracture state and volume. We show that this model captures the wellbore and fracture geometry, the physical properties of injected fluid and the wellbore-fracture system dynamics. The model is then compared with experimentally measured well responses. The simulated responses are in good agreement with published experimental data from several water injection wells with depths ranging from 1000 ft to 9000 ft. Hence, we conclude that the transmission line model of water injectors adequately captures wellbore and fracture dynamics. Using an extensive data set for the South Belridge Diatomite waterfloods, we demonstrate that even for very shallow wells the fracture size and state can be adequately recognized at wellhead. Finally, we simulate the effects of hydrofracture extension on the transient response to a pulse signal generated at wellhead. We show that hydrofracture extensions can indeed be detected by monitoring the wellhead pressure at sufficiently low frequencies. 相似文献
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Yang Shenglai Sheng Zhichao Liu Wenhui Song Zhixue Wu Ming Zhang Jianwei 《石油科学(英文版)》2008,5(4):340-347
Reduction in water injectivity would be harmful to the waterflood development of offshore sandstone oil reservoirs. In this paper the magnitude of formation damage during water injection was evaluated by analyzing the performance of water injection in the Bohai offshore oilfield, China. Two parameters, permeability reduction and rate of wellhead pressure rise, were proposed to evaluate the formation damage around injection wells. The pressure performance curve could be divided into three stages with different characteristics. Analysis of field data shows that formation damage caused by water injection was severe in some wells in the Bohai offshore oilfield, China. In the laboratory, the content of clay minerals in reservoir rock was analyzed and sensitivity tests (including sensitivity to water, ftow rate, alkali, salt and acid) were also conducted. Experimental results show that the reservoir had a strong to medium sensitivity to water (i.e. clay swelling) and a strong to medium sensitivity to flow rate, which may cause formation damage. For formation damage prevention, three injection schemes of clay stabilizer (CS) were studied, i.e. continuous injection of low concentration CS (CI), slug injection of high concentration CS (SI), and slug injection of high concentration CS followed by continuous injection of low concentration CS (SI-CI). Core flooding experiments show that SI-CI is an effective scheme to prevent formation damage and is recommended for the sandstone oil reservoirs in the Bohai offshore oilfield during water injection. 相似文献
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海上油田注水井复合纳米降压增注技术研究 总被引:2,自引:0,他引:2
为解决海上油田注水井压力升高过快,欠注现象严重的问题,在室内复配了一种适合于海上油田注水井的复合纳米降压增注物料体系。进而评价了该体系的稳定性、界面活性、防膨性能、改变岩石润湿性能以及降低微粒运移伤害能力,还通过岩心驱替实验评价了其降压增注效果。结果表明,该复合纳米降压增注体系具有良好的稳定性和界面性能,在储层温度下放置50 d后界面张力仍然可以稳定在10-2 mN/m的数量级。体系对岩心粉末的防膨率可以达到96.7%,并且可以有效改变岩石表面润湿性。使用该复合纳米降压增注物料处理后的驱替液颗粒总数以及粒径中值都明显降低,说明其具有较好的降低微粒运移堵塞的可能性。岩心驱替实验结果表明,经增注措施处理以后压力降低率均可以达到35%以上,可见复合纳米降压增注物料体系具有明显的减阻效果,能够满足海上油田注水井长期降压增注的需要。 相似文献
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利用产出剖面分析合采产出效果 总被引:2,自引:1,他引:1
井口压力控制对气田多层合采效果影响较大,利用生产测井中的产出剖面可以动态监测生产井的生产状况,这在大牛地气田连续几年的生产监控中起到了很大的作用。以D1-2-48井为例,在对其历年产出剖面处理分析的基础上,利用井底静压平均参数公式推导了井口静压迭代公式,估算出该井的合理井口压力。综合研究结果表明:井口压力控制对于合采井的井底低产气层的影响较大,当井口压力过大时其产能受到限制;利用井底静压平均参数计算公式得到的井口静压和利用产出剖面计算得到的井底压力与实测结果较为吻合;下一步可对工区合采井进行复查,计算最大井口压力,为调整生产压力、实现多层稳产提供依据。 相似文献