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详细分析了川西地区中深层、深层储层损害的主要原因,阐述了川西地区的屏蔽暂堵、非渗透钻井液及欠平衡钻井这3种储层保护技术的研究与应用情况,针对目前这3种储层保护技术应用特点,总结出了川西气藏3种主要储层保护技术分别的适用范围,并提出了川西气藏储层保护技术的未来发展方向。 相似文献
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东濮凹陷深层砂岩油(气)藏具有高温、高压、低孔隙度、低渗透的特点,使得试油压裂工艺难度加大。通过对过去深井试气压裂技术总结分析,并结合现有的先进理论及工艺技术,以深层砂岩油气藏为研究对象,根据储层物性和流体相态对其进行细化,并根据深层砂岩油气藏的特点开展试油气技术(射孔技术、地层测试技术、储层改造技术、排液技术)配套研究,探索适合东濮凹陷深层砂岩油气藏的试油气配套技术。 相似文献
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以油作为连续相的油基钻井完井液,具备钻井工程对钻井完井液各项性能的要求,可应用于水平井和储层保护的钻完井工艺中去,同时能有效地避免水敏作用和降低油气层损害程度,成为了实现储层保护的重要手段。本文将从其研究现状和技术类型两个方面阐述油基钻井完井液技术对水平井保护储层的重要性。 相似文献
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在油气田的勘探开发过程中,只有减少对油气层的损害,才有可能获取更大的综合经济效益。油气层损害是指在油气井钻井、完井、增产措施施工中,各种工作液在井周附近储层中造成的减少油气层产能的现象。而维持储层产能的重要条件是岩石的渗透性,渗透率越高,流体导流能力越高,储层产能越高。因此,保护油气层的核心问题就是如何保持储层的渗透率。川东北陆相气藏埋藏深,储层类型复杂,泥质含量高,勘探作业施工过程中的入井液体与地层流体不配伍,易引起水敏、盐敏、压敏等现象。文中对试气作业施工可能造成储层损害的因素及采取的相应保护措施进行了详细分析,目的在于提高陆相气藏储层保护水平,确保气藏产能得以彻底解放。 相似文献
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松辽盆地北部深层由于地层埋藏深度大,地质结构复杂、地温高、成岩作用强,岩性岩相变化大,因而导致深层天然气聚集规律复杂,勘探难度大。松辽盆地在对烃类天然气长期勘探并取得巨大突破的同时,也意外地发现了一些高含CO2气藏。CO2气藏直接影响并制约烃类气藏勘探部署,因此研究CO2气藏特征及成藏模式对突破天然气勘探瓶颈具有重要意义。本文通过对昌德地区CO2气藏特征的分析,建立出含CO2气藏成藏模式。昌德地区CO2气藏的形成是地球深部地质作用形成富含CO2气热液的资源库、以渗流与间歇性涌流的方式向上运—聚的产物。由强烈的壳-幔相互作用使深部资源进入地壳的软流圈上涌区、地壳中的"拖网"结构以及深大断裂的各类高角度断层和由深大断裂引发的一系列的岩浆活动沟通了深部流体与盆地的联系,运移到盆地中有效构造部位,并提供了良好的储盖条件后聚集成藏。 相似文献
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针对目前塔里木库车山前构造裂缝性砂岩气藏埋藏深、压力高,钻井取心困难、取心收获率低且裂缝网络十分发育,难以通过单一室内实验或经验公式获取气藏相对渗透率曲线的问题.本文运用在调研和对比国内外相对渗透率曲线研究方法的基础上,以大北气藏为例,通过室内实验和经验公式两种方法综合研究,从而优选出了适合于大北气藏裂缝网络的相对渗透率计算经验公式.该研究对于将来解决库车山前构造裂缝性气藏相对渗透率研究所面临的难题有很好的借鉴效果,并且也为科学编制大北气藏开发方案提供了技术支撑. 相似文献
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伊通地堑岔路河断陷西北缘为低孔低渗致密凝析气藏,勘探主力储层埋藏深(2 000~4 000 m)、闭合应力梯度高(0.018~0.024 MPa/m)、温度高(95~150℃);储层伊蒙混层粘土矿物含量高,喉道细小;存在水敏、反凝析及"水锁"伤害,制约产能。常规压裂技术压后返排率低、产能低或无效果。采用复合压裂体积改造技术,通过高排量大液量低表界面、高防膨性能滑溜水造缝增加孔隙压力,提高地层能量同时形成复杂裂缝网络,降低水敏、水锁、反凝析现象,提高气体由基质向裂缝渗流的通道;并集成组合支撑、套管压裂等多项技术进行高排量大液量体积改造技术研究,现场应用2口井2层,施工成功率100%,压后返排率80%。 相似文献
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Climate scientists are practically unanimous in the belief that anthropogenic greenhouse gas contributions have added to the thickness and thus the effectiveness of the greenhouse gas layer, leading to a warming of the planet (IPCC, 2005 [1]). Engineers and scientists around the globe are researching and developing measures to reduce greenhouse gas emissions. These measures have included proposals to sequester carbon dioxide (CO2) in deep geological formations (Perera et al., in press [18]). For CO2 sequestration in deep geological reservoirs to become a feasible strategy to reduce greenhouse gas emissions, a sound understanding of the manner by which mechanical properties and permeability changes with the introduction of CO2 to the geological reservoir will influence the stability of that reservoir is required. Thus there is a need to develop laboratory equipment capable of simulating the CO2 injection and storage process for deep geological CO2 sequestration under the expected in situ pressure (confinement and fluid) and temperature conditions. Triaxial experiment has been identified as the best method for this purpose (Perera et al., 2011b [19]). Therefore, we present a new high-pressure triaxial apparatus which can provide the high confining and fluid injection pressures and elevated temperatures expected for deep geological CO2 sequestration. The new setup can be used to conduct mechanical and permeability testing on intact or fractured natural rock samples or synthetic rock samples subjected to high-pressure injection of up to three fluid phases (gas and/or liquid) at high pressures and temperatures corresponding to field conditions. The equipment is capable of delivering fluids to the sample at injection pressures of up to 50 MPa, confining pressures of up to 70 MPa and temperature up to 50 °C and will continuously record fluid injection and confining pressures, axial load and displacement, radial displacement and independent outflow rates for liquid and gas fluid phases (under drained conditions).Leakage tests have confirmed the effectiveness of the device at pressures up to its maximum capacities. Additionally the temperature-pressure relationship for the hydraulic oil used to apply confining pressure to the sample has been calibrated to account for the influence of changes in temperature on confining pressure. Several permeability tests (using N2 and CO2 as the injection fluid and 10 MPa confining pressure) and one strength test are reported for black coal samples from the Sydney Basin, New South Wales. According to the results of the permeability tests, coal mass permeability decreases with increasing effective stress for both gases. However, the permeability for N2 gas is much higher than CO2. Moreover, test results are consistent with matrix swelling due to the adsorption of CO2 in coal. The strength testing results are in agreement with the results of testing carried on similar black coal samples from literature, certifying the ability for the new device to accurately measure strength and deformation properties of rock under deep ground conditions. 相似文献
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松辽盆地北部徐家围子断陷深层火山岩储层类型多样化,气水关系复杂,气水层识别评价难。为了解决以往在深层储层气水层识别评价上的局限性,提高录井解释评价精度,为试气及压裂选层提供可靠依据,应用储层物性及气测资料计算灌满系数及地层含气量评价储层含气性的方法,建立了深层气水层识别标准及评价图版,在生产应用中取得了较好的效果,提高了深层天然气井的录井解释评价精度。 相似文献
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腰英台气田的主体构造由断层控制的构造-岩性气藏,为了搞清该气田的构造、储层和气藏特征,在区域构造演化分析的基础上,应用构造解析和储层分析技术,对工区主体构造进行了构造、储层特征研究,探讨了深层气藏的成藏特征,分析认为,腰英台主要为受构造、岩性双重控制的构造—岩性气藏,从而构建了本区复式油气成藏模式,对指导本区及类似地区油气勘探具有实际意义。 相似文献