南海西部油田高温高压储层敏感性研究

发布时间：2018-03-13 12:26

本文选题：高温高压　切入点：敏感性　出处：《长江大学》2015年硕士论文　论文类型：学位论文

【摘要】：南海西部油田公司下属东方气田黄流组储层平均地层温度150℃,平均地层压力53MPa。通过对东方气田三井区岩心的高温高压储层敏感性实验研究,发现东方13-1井区敏感性以水敏和贾敏损害为主,其他敏感性损害较弱。东方1-1井区和东方13-2井区各敏感性损害均有发生,尤以速敏、水敏、酸敏和贾敏损害最强。通过对东方气田三井区岩心的高温高压储层敏感性实验研究,发现东方13-1井区敏感性以水敏和贾敏损害为主,其他敏感性损害较弱。东方1-1井区和东方13-2井区各敏感性损害均有发生,尤以速敏、水敏、酸敏和贾敏损害最强。东方13-1井区速敏损害为弱,临界流速较高,为48.95m/d；水敏程度弱-中等偏弱,临界矿化度值为4648mg/L；碱敏、酸敏和应力敏损害弱,无临界pH值,井区中仅东方13-1-4井测出9MPa的临界应力值,单井损害程度高于其他井,达到中等偏弱应力敏损害。东方1-1井区速敏损害为弱,但临界流速很低,仅为1.49m/d：水敏损害程度强,但临界矿化度较低,为4648mg/L；碱敏损害程度为中等偏弱,临界pH值8.5；酸敏损害率达到62%,损害程度中等偏强；应力敏损害弱,临界应力值9MPa。东方13-2井区是整体损害最强的区块,速敏、水敏和酸敏损害程度普遍为中等偏强-强,并具有临界流速低的特点,值为1.45m/d,临界矿化度各井差异较大,其中东方13-2-2井临界矿化度为4648mg/L,东方13-2-8d井临界矿化度最高,为13944mg/L,和地层水矿化度相同；碱敏损害程度与东方1-1井区持平,临界pH值更低,为7；应力敏损害弱,临界应力值15MPa。对比东方气田高温高压与常温常压敏感性结果,发现高温高压对碱敏和水敏损害程度基本没有影响,但对速敏和酸敏损害产生了一定的影响。东方13-2井区的高温高压速敏损害要明显高于常温常压的,东方1-1井区和东方13-2井区在模拟地层温压条件下酸敏损害要明显高于常温常压条件一个到两个级别。储集层损害机理主要可以分为以下两方面。一是由于外来流体与储集层岩石的相互作用,造成外来固相颗粒的侵入堵塞、不配伍的注入流体造成的敏感性损害、储集层内部微粒运移造成的地层损害、出砂、细菌堵塞等；另一方面是由于外来流体与地层流体间的不配伍性,造成乳化堵塞、无机结垢堵塞、有机结垢堵塞、铁锈与腐蚀产物的堵塞、地层内固相沉淀的堵塞。各损害因素往往是相互影响,甚至加剧了对地层的损害。在油田开发技术日益发展的过程中,国内外众多地质专家在实践过程中逐步认识到,影响油气田采收率的因素不仅仅局限于储集空间的成因类型和时空分布特征,开发过程中发生的储层敏感性损害也是导致油田产量下降,采收率遭遇瓶颈的一大根本原因。储层敏感性是指油气田钻探与后期开发过程中储集层受损害的难易程度(即敏感性程度)。储层敏感性损害可能发生在油气藏开发的任何时间或空间,从钻井到注水等一系列措施都可能导致储层敏感性损害的发生,因此预防储层敏感性损害是一项长期、艰巨的任务。在油气田开发初期及时进行储层敏感性的研究可以为钻井泥浆配方设计、油气田开采速度、注水方案设计等提供重要依据,并能防止在后续勘探作业中发生“误诊”,敏感性等储层保护工作是油气田长期、稳定开采的重要基石。在高温高压实验环境下的储层保护研究方面,陆续有研究人员进行了高温高压钻井液滤失、高温高压工作液性能优化等方面的研究,而对模拟地层环境的高温高压储层敏感性研究还极少,对于高温高压与常温常压条件下的储层敏感性差异没有一个确切的认识,有必要进行这方面的先驱性实验研究,明确高温高压敏感性实验的必要性。东方1-1井区和东方13-2井区整体敏感性强的主因是其粘土矿物含量相对较高,高岭石、伊蒙混层、绿泥石等均有大面积分布,且存在黄铁矿和无定形硅等矿物成分加剧损害。东方气田整体应力敏损害较弱是因为研究区砂岩碎屑中石英含量高达60%-76%,石英含量占绝对优势,石英强度极高,在外力作用下抵抗变形的能力强,不易形变。
[Abstract]:Nanhai West Oil Company Dongfang Huangliu formation reservoir average temperature is 150 degrees centigrade, the average formation pressure of 53MPa. through the sensitivity test of high temperature and high pressure reservoir on the core of Dongfang District found that the sensitivity of Mitsui, East 13-1 wells to water sensitivity and Jia Min damage, other damage sensitivity is weak. The East 1-1 well area and East 13-2 well the sensitivity damage have occurred, especially in the velocity sensitivity, water sensitivity, acid sensitivity and Jia Min damage. By studying the sensitivity of the strongest high pressure reservoir of the core area of Dongfang Mitsui found in the East, 13-1 well area sensitive to water sensitivity and Jia Min damage, other damage sensitivity is weak. The East region and 1-1 wells the East 13-2 wells each sensitivity damage has occurred, especially in the velocity sensitivity, water sensitivity, acid sensitivity and Jia Min damage. 13-1 well area east the strongest velocity sensitivity is weak, the critical velocity is high, 48.95m/d water sensitive process; The degree of weak - medium weak, critical salinity value 4648mg/L; alkali sensitivity, acid sensitivity and stress sensitivity is weak, no critical value of pH well area only East 13-1-4 wells measured critical 9MPa stress values, single well damage degree is higher than other wells to medium weak stress sensitivity damage. The East 1-1 wells area velocity sensitivity is weak, but the critical velocity is very low, only 1.49m/d: the damage of water sensitivity is strong, but the critical salinity is low, 4648mg/L; alkali sensitivity degree is medium weak, the critical value of 8.5 pH; acid sensitivity damage rate reached 62%, the damage degree of moderate to strong stress sensitivity damage is weak; the critical stress value, 9MPa. East 13-2 well area is to block the strongest overall damage velocity sensitivity, water sensitivity and acid sensitivity damage level is generally moderate to strong - strong, and has the characteristics of low critical velocity, 1.45m/d value, critical salinity of each well is different, the Oriental 13-2-2 wells critical salinity is 4648mg/L Oriental, 13-2- Well 8D critical salinity highest is 13944mg/L, and the same salinity; alkali sensitive damage and the East 1-1 well flat, critical lower pH value, 7; the stress sensitivity is weak, the critical stress value of 15MPa. contrast of Dongfang high temperature and high pressure and at normal temperature and pressure sensitivity of the results, we have no effect on the high temperature and high pressure alkali sensitivity and water sensitivity damage degree, but have a certain influence on the velocity sensitivity and acid sensitivity damage. High temperature and high pressure velocity sensitive damage East 13-2 well area was higher than that of normal temperature and pressure, the East 1-1 well area and East 13-2 well area in simulated formation conditions of damage of acid sensitivity was higher than that of normal temperature and pressure one to two levels. The reservoir damage mechanism can be divided into the following two aspects. One is due to the interaction of reservoir rock and fluid reservoir outside, blockage is invaded by exotic solid particles, the incompatibility of injected into the fluid The sensitivity of damage to reservoir formation damage caused by the internal layer of sand particle migration, bacteria blockage; on the other hand is due to incompatibility between the outer fluid and stratum fluid, emulsion plugging caused by fouling, inorganic, organic fouling, clogging, rust and corrosion products, blocking the precipitation formation. Each damage factor is often mutual influence, and even increase the formation damage. In the process of growing oil development technology, many domestic and foreign geological experts to gradually realized in the practice process, the influence factors of oil and gas recovery is not limited to the reservoir space types and spatial distribution characteristics of the reservoir. The sensitivity of damage occurred in the development process also leads to the decline of oil production and recovery suffered a major root causes. The reservoir sensitivity refers to the drilling process and the late development of reservoir damage And the degree of difficulty (i.e. sensitivity). The sensitivity of reservoir damage may occur at any time or space for the development of oil and gas reservoirs, a series of measures from drilling to water injection can lead to reservoir damage, thus preventing reservoir damage is a long-term and arduous task. In the early stage of oil gas field development and timely research of reservoir sensitivity can be designed for drilling mud formula, velocity of oil and gas exploration, provide an important basis for water injection program design, and can prevent in the subsequent exploration "misdiagnosis", the sensitivity of reservoir protection is an important cornerstone of long-term stability of oil and gas, mining. Research on reservoir protection areas in the experiment of high temperature and high pressure environment, have researchers conducted a high temperature and high pressure drilling fluid of high temperature and high pressure working fluid, performance optimization, and the simulation environment of high layer Study on high temperature reservoir sensitivity is very few, do not have an exact understanding of reservoir sensitivity differences in high temperature and high pressure and normal temperature conditions, it is necessary to carry out pioneering experimental research in this area, to make clear the necessity of high temperature and high pressure sensitivity experiments. The East 1-1 well area and the East 13-2 well area overall sensitivity is the main reason the relatively high content of clay minerals, kaolinite, illite smectite, chlorite have large area distribution, and the presence of pyrite and amorphous silicon minerals increased damage. Dongfang overall stress sensitivity is weak because quartz clastic sandstone in the study area as high as 60%-76%, the content of quartz quartz dominated, high intensity, under the action of external force to resist deformation ability is strong, not easy to deformation.

【学位授予单位】：长江大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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