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对于油质差、产液量高、多次长时间排液井层,常规的试井方法难以达到测产目的。采用试油排液与测产连续监测技术,将智能型电子压力计随排液管柱下入井底,对排液过程及液面恢复情况进行实时监测,计算出液面恢复产量,检查排液效果。该项技术可以计算出任意阶段的液面恢复产量,特别适合于稠油、高凝油、高产液层的测产及多次长时间排液、压裂施工、水力泵排液等的连续监测,有效缩短试油周期,提高试油地质资料录取质量。 相似文献
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研究了无粘土相正电性钻井液完井液配方,该钻井液完井液是一种在正电状态下分散的胶体体系,全部由阳离子处理剂配制而成。对无粘土相正电性钻井液完井液的ζ电位变化规律、流变参数、抑制性、抗高温、抗粘土污染、抗盐污染及保护油气层等进行了试验。结果表明,该体系具有独特的性能,ζ电位大于20mV,具有极强的抑制粘土分散能力,能够最大限度地避免粘土颗粒侵入油层而造成的损害;ζ电位高,胶体稳定,流变参数等各项性能指标均能满足现场施工要求;阳离子处理剂能保持钻屑的不分散,有利于钻屑的清除;随粘土量的增加,吸附阳离子聚合物的量也随之增加,由于阳离子聚合物有效浓度的降低,所以正电性钻井液完井液粘度下降;无粘土相正电性钻井液完井液具有很好的保护油气层效果,能有效换制油层粘土膨胀,渗透率恢复值高,适应于强水敏油层及易造成固相伤害油层的开发。 相似文献
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试油排液工艺技术应用研究 总被引:3,自引:1,他引:2
根据胜利油田近几年勘探试油排液的典型井例,针对不同地层液性采用的不同的排液工艺技术,总结出了以地层测试为中心的一般油水井、稠油井的排液及水力泵、纳维泵排液工艺技术系列,为油田的勘探试油与 开发提供了依据。 相似文献
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二连油田的乌里雅斯太凹陷和巴音都兰凹陷,主要含油为腾格尔组,含油岩性以砂岩,砂砾岩为主,压力系数一般为0.958-1.035,在施工过程中,钻井液密度应控制在1.25g/cm^3以内,在勘探过程,中油层易发生水繁损害,或在压差作用下,钻井液中的部分因相颗粒被直接入地层,堵塞通道,造成油层伤害。采用油气层保护技术与油气层保护剂YD-2B相配合的措施,降低了钻井液密度,有效地防止了油气层的损害。 经20多口井现场应用表明,油气层保护剂YD-2B,阻止钻井液滤液侵入地层,减少污染,缩短了钻井周期,有效地保护了油气层,试油结果表明,在乌里雅斯太争和巴音都兰凹陷所钻的探井中50%,获得了高产工业油气液,特别太43井,经过对1872.0-1892.0m井段油层的试油,获得日产量为14.82m^3的工业油流。 相似文献
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在水平井里使用的钻井液必须尽可能无害,在垂直井眼里,由于钻井液和固体颗粒的侵入引起的局部损害可通过注水泥及射孔消除。由于水平井的射孔成本高,排液必须依靠井眼流动或化学激励技术来实现。 相似文献
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为提高排液求产速度,达到连续排液、减小地层污染的目的,长庆油田开发了一种排液求产的新方法——水力泵排液技术。该方法具有排液强度大、效果高、施工方便、抽汲深度深、日排液量大等特点。经四口井5井次实验,取得了一定效果,为长庆油田深井排液提供了新途径。 相似文献
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大庆油田大斜度井试油测试工艺存在封隔器坐封成功率低、排液困难等问题。分析近两年10口井25层大斜度井试油测试施工案例,针对不同井况特点,进行"隐含式"和"卡瓦式"Y211封隔器优选,配合扶正器使用,通过现场操作模拟试验、优选井下工具、优化工艺管柱结构等措施,合理优选排液求产方法,形成适合大庆油田大斜度井试油工艺技术。在最大井斜51.3°的LTX4井采用斜井联作封隔器进行MFE射孔测试联作,取得了准确的液性及产能等资料。该工艺可有效提高大斜度井试油施工成功率,为勘探开发试油资料录取提供技术支持。 相似文献
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文中提出了钻井液对油层污染程度的评价方法,介绍了钻井液常湿中压失水量的测定,钻井液滤液对油层岩心渗透率的损害实验,钻井液滤液时钠膨润土的膨胀试验,钻井液与地层水的化学配伍性能试验等,分析了试油中钻井液浸入油层,对油层的污染程度等。 相似文献
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油井深抽过泵产液剖面测试技术 总被引:1,自引:0,他引:1
为准确找出油井的出水层段,研究了深抽过泵产液剖面测试技术。该工艺技术在油井检泵作业施工期间.进行,在井下2000m以内套管上悬挂空心测试抽汲泵,通过油管驱动深抽产液,测试仪器从油管下入并过泵柱塞到达测试层段,进行不停抽测试,得到产液剖面资料,判断出主产水层,进行有针对性的卡堵水作业。适用于斜井、稠油井、螺杆泵井、电潜泵井、水力泵井等无法进行环空测试的油井。在华北油田成功实施了50余井次,为油田开发方案的判定提供了较为准确的资料。 相似文献
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热采过程中硫化氢成因机制 总被引:7,自引:0,他引:7
为了防范稠油油藏注蒸汽开采过程中井口产出硫化氢所造成的安全隐患,增强热采油井安全生产水平,亟需对稠油热采过程中硫化氢的来源及成因机制开展相关实验研究。对辽河小洼油田洼38区块的岩心、原油和产出水3种不同物质开展了含硫量测定、硫同位素分析和H2S生成热模拟实验。实验研究结果表明:稠油热采中生成的硫化氢主要来源于岩心和稠油;在硫同位素分馏过程中,形成硫化物(H2S)的δ34S反映了硫酸盐热化学还原过程中硫在较高温度下的分馏特征;硫化氢的生成机理主要为高温高压酸性环境下稠油水热裂解和硫酸盐热化学还原之间的交互作用。 相似文献
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针对深水气井测试过程中井筒温度场的变化带来水合物生成的巨大风险,易导致测试管柱堵塞、环空出现较大的带压值等严重问题,对水合物生成相态曲线在深水气井测试过程中的多方面应用进行了研究。首先在深水气井测试井筒温度场精确预测的基础上,结合水合物相态曲线,定量预测了测试期间管柱内水合物的生成区域,计算得出了测试管柱上的化学药剂注入阀的下入深度,并设计确定了测试期间井筒及地面油嘴处水合物抑制剂的注入量,形成了深水气井测试水合物相态曲线应用方法。该方法在南海深水某气井进行了综合应用,计算得出该井测试期间化学药剂注入阀下入深度为2 450 m,井筒及地面油嘴处水合物抑制剂注入分别为甲醇和(3%~5%)乙二醇,综合应用测试作业工作制度,测试期间井筒无水合物生成,地面油嘴处水合物生成注入抑制剂后压力下降约13.6%,保证了现场测试作业的成功实施,可为其他深水气田测试过程中天然气水合物的防治提供借鉴。 相似文献
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The alkaline-surfactant-polymer (ASP) floods have been increasingly applied in the oil fields because of their high ultimate oil recovery. However, a major technical challenge is how to reduce the amount and the cost of chemicals used so that ASP floods can become cost-effective as well. On the other hand, field applications show that the chemical concentrations remain relatively high in the produced liquids of ASP floods. Therefore, successful detection and reuse of these produced chemicals can substantially reduce their capital cost and environmental impact. In this article, several experimental methods are developed to detect each chemical and quantify its concentration in the produced liquids. Also re-injection of the produced chemicals is conducted to further enhance oil recovery. First, the respective interactions of alkali, surfactant, and polymer with the oil-brine-sand system are studied. Second, the interfacial tension (IFT) is measured as a function of alkaline concentration by using the axisymmetric drop shape analysis technique for the pendant drop case. In addition, the synergistic effects of alkali and surfactant on reducing the IFT are studied. Third, coreflood tests are performed for alkaline, surfactant, alkaline-surfactant, polymer, and ASP floods to determine their respective tertiary oil recovery. Hence, how each chemical contributes to enhanced oil recovery is better understood. Fourth, the produced chemical concentrations are measured and compared with their injected concentrations to determine the potential of reusing these chemicals in practice. Finally, the follow-up coreflood tests are conducted by re-injecting the produced liquids into a new sand pack or Berea core. The re-injection coreflood test results show that the produced chemicals can be reused to effectively enhance oil recovery. 相似文献
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《Petroleum Science and Technology》2013,31(9-10):1033-1057
Abstract The alkaline-surfactant-polymer (ASP) floods have been increasingly applied in the oil fields because of their high ultimate oil recovery. However, a major technical challenge is how to reduce the amount and the cost of chemicals used so that ASP floods can become cost-effective as well. On the other hand, field applications show that the chemical concentrations remain relatively high in the produced liquids of ASP floods. Therefore, successful detection and reuse of these produced chemicals can substantially reduce their capital cost and environmental impact. In this article, several experimental methods are developed to detect each chemical and quantify its concentration in the produced liquids. Also re-injection of the produced chemicals is conducted to further enhance oil recovery. First, the respective interactions of alkali, surfactant, and polymer with the oil-brine-sand system are studied. Second, the interfacial tension (IFT) is measured as a function of alkaline concentration by using the axisymmetric drop shape analysis technique for the pendant drop case. In addition, the synergistic effects of alkali and surfactant on reducing the IFT are studied. Third, coreflood tests are performed for alkaline, surfactant, alkaline-surfactant, polymer, and ASP floods to determine their respective tertiary oil recovery. Hence, how each chemical contributes to enhanced oil recovery is better understood. Fourth, the produced chemical concentrations are measured and compared with their injected concentrations to determine the potential of reusing these chemicals in practice. Finally, the follow-up coreflood tests are conducted by re-injecting the produced liquids into a new sand pack or Berea core. The re-injection coreflood test results show that the produced chemicals can be reused to effectively enhance oil recovery. 相似文献