共查询到20条相似文献，搜索用时 906 毫秒
1.
空气泡沫驱是重要三采技术,为了了解该技术适用储层类型,笔者等通过文献调研、机理分析、室内实验及油藏生产动态数据分析研究其注入效果与储层非均质性关系,结果表明：该技术通过泡沫体系产生阻力提高波及系数,泡沫中包含的表面活性剂降低界面张力提高驱油效率,泡沫特性“遇油消泡,遇水不变”可有效调剖堵水并改善流度比,非均质性强的储层具有大小不一的孔喉、较大的孔喉比和较强的贾敏效应,使上述增加波及系数、驱油及堵水效果更强,从而在水驱基础上可以进一步大幅提高采收率。实验和生产动态资料都说明,储层非均质性越强,表现为渗透率级差较大,增产和堵水效果越好,因此空气泡沫驱适用于储层非均质性较强的储层。该研究成果为空气泡沫驱的推广提供借鉴。 相似文献
2.
空气泡沫驱是重要三采技术,为了了解该技术适用储层类型,笔者等通过文献调研、机理分析、室内实验及油藏生产动态数据分析研究其注入效果与储层非均质性关系,结果表明：该技术通过泡沫体系产生阻力提高波及系数,泡沫中包含的表面活性剂降低界面张力提高驱油效率,泡沫特性“遇油消泡,遇水不变”可有效调剖堵水并改善流度比,非均质性强的储层具有大小不一的孔喉、较大的孔喉比和较强的贾敏效应,使上述增加波及系数、驱油及堵水效果更强,从而在水驱基础上可以进一步大幅提高采收率。实验和生产动态资料都说明,储层非均质性越强,表现为渗透率级差较大,增产和堵水效果越好,因此空气泡沫驱适用于储层非均质性较强的储层。该研究成果为空气泡沫驱的推广提供借鉴。 相似文献
3.
Gyoo-Bum Kim 《Environmental Earth Sciences》2013,69(6):2059-2072
Though the geologic barrier surrounding a dam reservoir plays an important role in preventing water seepage to the outside of a reservoir, a detailed survey to assess bedrock conditions of the whole reservoir boundary is seldom performed when designing a dam. In this study, a variety of investigations and analyses have been conducted to reveal a seepage phenomenon through a reservoir boundary composed of highly fractured metamorphic rocks at the Daechung multipurpose dam. At the study site, groundwater levels at monitoring wells located close to a reservoir tend to change proportionally to reservoir water levels, usually with a rapid response time of 1 day or less. Soil moisture content also changes with respect to the reservoir water level, and the area where seepage from the reservoir is a possibility has a relatively high soil moisture content. The similarity of measured seepage rates at the outflow site and the seepage rate estimated by Darcy’s law suggests strong connectivity and high density of the fractures. The estimated seepage rate using a numerical model for the northernmost valley (Zone 1) is approximately 127.2 m3/day in the case of high reservoir water level and 24.3 m3/day in the case of low water level. Continuous monitoring to obtain time series data for water levels, quality, and bedrock displacement is recommended to assess the sustainable stability of this geologic barrier. 相似文献
4.
以长庆某致密油井区取心样品、注入水与地层水、优选的空气泡沫体系等为基础,利用一维长岩心驱替实验装置开展了致密油储层基质与裂缝岩心分别注入纯泡沫液、空气与空气泡沫的注入能力实验,揭示在实际储层条件下,空气泡沫体系无法直接进入致密油基质岩心,但由于泡沫剂受到储层吸附,消泡后的纯泡沫液与气体可以顺利注入致密油基质岩心实现稳定驱替。设计并开展了基质渗透率级差为10、基质与裂缝双重发育的三管并联岩心驱替实验,明确了空气泡沫封堵裂缝调驱机理。泡沫流体主要进入裂缝岩心并有效封堵裂缝,部分泡沫消泡后形成的泡沫液与空气进入并驱替基质中的剩余油,最终空气泡沫驱残余油饱和度比水驱降低了21.12%,驱油效率提高了32.89%,改善水驱后开发效果明显;为避免暴性水淹的低效阶段,应在含水90%以前尽早转入空气泡沫驱,提高采油速度与经济效益。 相似文献
5.
To reduce or avoid some of the ambiguities in a heterogeneous reservoir, a fine three-dimensional model would be inevitably established with the application of geostatistical techniques. BD oilfield is a low-permeability fractured reservoir with many fracture types, which composes a multi-azimuthal fracture system, causing strong anisotropy and heterogeneity. Moreover, fracture provides not only accumulation space for oil and gas but also channels for migration of hydrocarbons and water dashing and thus plays a leading role in controlling BD reservoir production. With the continuous exploitation of oil in reservoir for more than 30 years, BD oilfield has currently stepped into high water cut stage, exposing many problems such as low oil recovery, poor exploitation stability, rapid oil production decline, and one-way water intrusion. Therefore, a detailed reservoir characterization, constructed to describe reservoir behavior under strong water drive in a well-developed fractured reservoir, is urgently needed. In this study, combined with three-dimensional geostatistical techniques, an accurate and efficient reservoir parameter model that occurs in a strong heterogeneous fractured reservoir has been constructed through stratigraphic correlation and sedimentary facies analysis. Hence, all the study presented above will be available for well location, remaining oil potential-tapping and oil recovery improvement during the later study work. 相似文献
6.
通常聚合物驱的最终采收率在50%左右,聚合物驱后剩余油具有相当的开采潜力。以大庆长垣北部多段多韵律聚驱主力油藏为例,采用化学驱油藏数值模拟技术,系统研究并总结了典型油藏聚驱后平面及纵向剩余油的分布特征。结果表明,聚驱后油藏剩余油的分布系统可划分为2大成因、3大区域和7个部位。其中:存在受地质因素制约的剩余油,如废弃河道中部、砂体尖灭区、相对孤立的薄差砂体;也有开发因素控制的剩余油,如厚油层顶部剩余油、注采不完善部位、注入井间与生产井附近以及聚驱后高渗层内的残余油。聚合物驱后油藏剩余油主要富集于3大区域内,究其原因则主要源于水驱和后续聚驱波及程度的不同。 相似文献
7.
对鄂尔多斯盆地合水地区长6油层组超低渗透储层的微观渗流特征及驱油效率影响因素进行深入研究,为提高采收率提供了科学依据。研究以真实砂岩微观模型渗流实验为主要手段,结合铸体薄片、扫描电镜、压汞等方法对孔隙结构、岩石类型等进行测试。研究表明,研究区长6油层的渗流特征以网状驱替和均匀驱替为主,指状驱替甚少;不同的驱替类型对应不同的最终驱油效率,均匀驱替模型最终驱油效率最高,指状驱替模型最低。储层物性中渗透率是影响驱油效率的主要因素,孔隙度次之;适当地提高驱替压力能够有效地提高驱油效率;提高注水体积倍数也能适当地提高驱油效率;非均质性对驱油效率也有一定的影响。 相似文献
8.
我国海上稠油资源比较丰富,但由于受到海上条件等因素限制,聚合物驱成为提高海上稠油采收率的主要方法.因此深化聚合物溶液驱稠油微观渗流机理对于进一步提高采收率具有十分重要的意义.目前关于粘弹性聚合物渗流机理的理论研究主要局限于弹性聚合物溶液的单相流体在微观孔道内流动特征研究,而针对粘弹性聚合物、油两相流体渗流机理的研究甚少,特别是针对稠油聚合物驱的相关研究未见报道.为此,借助于计算方法较为成熟的OpenFOAM开源平台开展了聚合物驱稠油两相流体渗流机理的研究;以收缩孔道为微观物理模型,建立了粘弹性聚合物溶液、普通稠油两相渗流连续性方程、运动方程及本构方程,并采用VOF（volume of fluid）界面追踪方法建立两相界面相方程;以OpenFOAM开源平台为基础,开发了粘弹性流体、幂律流体两相流体求解器;绘制了不同弹性聚合物溶液在微观孔道内驱油的饱和度分布、速度分布及应力分布特征.结果表明,相对于水驱,纯粘性聚合物溶液前缘突破时间慢,波及面积大,驱油效率高.相比于同等粘度的纯粘性聚合物溶液,粘弹性聚合物的弹性有助于挖潜凸角内的残余油,聚合物溶液的弹性越大,稠油驱油效率越高.随着聚合物溶液弹性的增强,第一法向应力增大,当聚合物溶液进入到孔道突变处时,其弹性发挥的作用最大,法向应力的值最大.研究结果可为矿场实施聚合物驱设计、筛选聚合物溶液提供重要的理论支持. 相似文献
9.
A water-gas two-phase flow model of a fractured vertical well in a coalbed methane (CBM) reservoir is developed based on the Buckley-Leverett equation. A program is developed based on the proposed model to predict the production of a CBM well. Compared with the monitoring results of an actual vertical fractured well, the accuracy and reliability of the analytical model are approved. The impact of reservoir parameters and fracture parameters on the CBM production are quantitatively studied. The results indicate that the production is affected by the three major factors: gas supply capacity of the matrix (viz., CBM volume released by unit volume of matrix during unit time), supply capacity of the fracture network to the major fracture, and gas exhausting ability of the major fracture to the wellbore. The permeability, matrix radius, and coal seam thickness with larger values are good for the gas supply capacity of the matrix. Higher flow conductivity of major fracture shows a stronger impact on the gas exhausting ability of the major fracture to the wellbore. A smaller fracture interval is beneficial to the supply capacity of the fracture network to the major fracture to obtain higher production. To improve the efficiency of the actual well, the flow conductivity of the major fracture should be no more than 200 mD m and the crack interval should be between 20 and 30 m. The achievements of this study provide a case reference for the production prediction of vertical fractured wells and the optimization design of hydraulic fracture parameters of CBM reservoirs. 相似文献
10.
碱／聚合物二元复合驱是一种大幅度提高老油田采收率的三次采油方法．室内研究、试验表明，可比水驱提高采收率10％～18％左右．通过开展玻璃钢套管完井技术研究、玻璃钢套管测井方法研究和厚油层细分技术研究，在碱／聚合物二元复合驱先导实验区建立玻璃钢套管井时间推移感应测井和时间推移C／O测井系统，定量监测碱／聚合物二／C复合驱注入过程中剩余油饱和度的变化，通过8年的矿场试验，成功建立了剩余油饱和度定量研究的动态监测预测系统，同时，测井资料表明，碱／聚合物二元复合驱有效提高了波及体积和驱油效率． 相似文献
11.
Wimpy Karnanda M. S. Benzagouta Abdulrahman AlQuraishi M. M. Amro 《Arabian Journal of Geosciences》2013,6(9):3535-3544
In this research, effect of temperature, pressure, salinity, surfactant concentration, and surfactant type on interfacial tension (IFT) and critical micelle concentration of Saudi Arabian crude oil and various aqueous phases were investigated. The temperature ranged from ambient condition to 90°C, and the pressures were varied from atmospheric to 4,000 psi (27.58 MPa). Surfactant solutions were prepared using several aqueous phases, i.e., purified water, 10% brine consisting of 100% NaCl, 10% brine consisting of 95% NaCl and 5% CaCl2, and 10% brine consisting of 83% NaCl and 17% CaCl2. Out of 13 commercial surfactants, only three surfactants showed good solubility in pure water and brine. Those are Zonyl FSE Fluorosurfactant®, Triton X-100®, and Triton X-405®. Therefore, they were investigated thoroughly by measuring their efficiency in reducing the crude oil-aqueous phase IFT. Based on this screening process, laboratory surfactant flooding experiments for crude oil recovery were conducted using Triton X-405 and Triton X-100. The chemical flood was made at both original oil in place and at residual oil in place subsequent to conventional water flooding. Based on the obtained results, both surfactants were efficient, and more oil was recovered than that obtained through water flooding. Comparing both surfactant solutions, it was observed that Triton X-405 was more efficient than Triton X-100 at the same surfactant concentration and reservoir conditions. 相似文献
12.
定量与定性相结合的方法是储层流动单元研究的发展趋势。采用灰色层次分析法（GAHP）,选取孔隙度、渗透率、含油饱和度、饱和度中值压力、退汞效率和泥质含量等6个参数,对丘陵油田进行了流动单元的划分。研究表明,本区储层可以划分为E、G、M、P 4类流动单元：E类流动单元主要分布在水下分流河道中心部位,渗流能力最强,开发程度较高,但是易发生水淹;G类流动单元主要分布在水下分流河道,渗流能力较强,水淹程度较低,还存有一定的剩余油,是丘陵油田目前主要的生产动用层系;M类流动单元主要分布在水下分流河道和河道的边部,物性较差,目前动用程度较低,剩余油富集;P类流动单元主要分布在水下分流间湾部位,岩性致密,注入水很难波及到,目前几乎不具备开发价值。 相似文献
13.
Saheli Sanyal Kumar Abhishek Singh Harshil Parekh Vishrut Chokshi Uttam K Bhui 《Journal of Earth System Science》2018,127(8):112
Low saline water flooding (LSWF) had proved to be an efficient method for enhanced oil recovery in clay-bearing hydrocarbon reservoirs, but the interaction mechanisms among in-situ rocks – fluids and injection fluids within the reservoir – are not yet known properly. Understanding the molecular level interaction among these components is critical for designing and field scale implementation of LSWF in clay-bearing crystalline reservoir rocks, which is very limited in the existing literature. A weathered amphibolite rock and one dead crude oil from the Bakrol field (Cambay basin, India) have been used in this study. The presence of clay minerals in the weathered amphibolite rock was observed using a polarising microscope and characterised by the X-ray diffraction (XRD) and Fourier transform infrared (FTIR) techniques. The crude oil and its fractionated SARA components have been extensively studied by spectroscopic techniques for their characterisation. The interaction study among the rock powder, hydrocarbon crude oil and saline water has been performed in the present work for gaining better insight for designing the injection fluid for LSWF. The weathered amphibolite rock powder was mixed with the dead crude oil and kept for 30 days in room temperature (T) and pressure (P) for proper interaction. The XRD, FTIR and cation exchange capacity results clearly demonstrated the incorporation of crude oil components in the interlayer surfaces of clay minerals. The oil removal efficiency, from the oil-treated rock powder of three saline water samples having NaCl concentration of 3000, 5000 and 8000 ppm, was investigated using the UV–Vis and fluorescence spectroscopies. The low saline NaCl water is capable of removing the maximum amount of polar components from the oil-treated rock powder. These molecular level insights are valuable for designing effective injection fluid for enhancing the oil recovery from the clay-rich crystalline reservoir rock. 相似文献
14.
基于COMSOL Multiphysics软件对非饱和裂隙土降雨入渗特性进行数值模拟研究。通过将裂隙和基质分别离散成有限单元,建立了能充分模拟土中裂隙流、基质流以及裂隙-基质流量交换的离散裂隙-孔隙介质模型。结合"空气单元"的概念,对裂隙土的上边界进行模拟。该方法不仅能描述降雨初期雨水沿裂隙优先入渗的现象,还能描述当降雨量大于裂隙土入渗量时雨水沿地表流走的现象。通过对地表以下2 m深度内低渗含裂隙土体进行模拟,分析了裂隙的几何特征、基质的水力特性、前期水分条件以及降雨强度对非饱和裂隙土降雨入渗过程的影响。结果表明,在非饱和裂隙土中,存在两个主要的渗流过程:一是水沿裂隙优先流动;二是水不断从裂隙吸入基质中,基质吸收水的作用抑制了裂隙中优势流的发展。与裂隙的几何特征相比,基质的水力特性对非饱和裂隙土渗流的影响较大。增大基质的饱和渗透系数可能使由裂隙流主导的渗流过程转变为由基质流主导的渗流过程,而基质的非饱和特性与裂隙土的初始含水率改变了土体的储水能力,从而加速或延缓了降雨入渗至某一深度的时间。降雨强度对土体入渗速率和入渗量均有影响,当超过裂隙土的入渗能力时,多余积水沿地表流走,断面入渗率随... 相似文献
15.
电化学导流提高原油采收率技术,在油田各个开发阶段都可达到增油降水的效果.目前多数主力油层内部剩余油分布零散,注水效果差,新增储量的油层大多数是渗透率低、物性差的薄油层.现场试验证明,应用电动法这一新技术,已初步实现了增加原油渗流速度、提高油水流动的相对渗透率和解除油层堵塞等的效果,工艺上是可行的.且用导线传输直流电场与其它传输方式相比,对井口及地面通电设备的安全性也较好. 相似文献
16.
核磁共振在孔南官195断块剩余油挖潜中的应用 总被引：2，自引：1，他引：1
大港油田孔南官195断块单井日产能力较低,层间层内矛盾恶化,部分油组水淹严重,剩余油分布规律认识不清.利用核磁共振技术,从微观角度研究不同流动单元的驱油特点和剩余油分布特点.研究发现:I类流动单元样品驱油效率比Ⅱ类流动单元高7.47%,但Ⅱ类流动单元样品水驱后聚合物驱油效率提高6.35%,剩余油主要分布于油层动用程度差的流动单元中.在完善注采系统基础上,挖潜时对I、Ⅱ类流动单元通过层间卡封和堵水调剖挖掘中上部剩余油,对Ⅲ、Ⅳ类流动单元采取补孔、打新井方式提高储量动用程度.采取一系列挖潜措施后,预计官195断块最终采收率将能提高5.1%. 相似文献
17.
The main objective of this paper is to estimate the water seepage from Lar dam reservoir based on a combination of the geological structure study results and identification of the flow conduits in the right bank of the reservoir. From the beginning of impounding the dam in 1980, heavy seepage was observed at two karstic springs, Haraz and Galugah, located about 9 km downstream of the dam. During the first impounding, the discharge of the Haraz spring abruptly increased from 0.5 m3/s to around 5 m3/s. The results of piezometers and dye tests indicate that seepage occurs mainly through the right abutment of the dam where there is a structural wedge between the north dipping North Tiz Kuh and the south dipping Lar Valley faults. F1, F2, and F3 faults are the most important faults in vicinity of the structural wedge. Based on the dye test results, the North Tiz Kuh and F3 faults along which caves No. 1 and 2 are formed are regarded as two isolated conduits for seepage and conveyance into Lar Valley Fault at downstream of Lar dam. After identifying the conduits, water seepage from the Lar dam reservoir has been calculated using finite element method. According to the results of numerical method, when the reservoir water level is at 2485 m a.s.l, the average of water seepage is around 8.51 m3/s (this amount of water is related to the seepage along the Lar Valley Fault). The average discharge of springs downstream of the dam has been used to verify the numerical method. The results show a very close relation between estimated and observed discharge. 相似文献
18.
为了解马岭油田南二区延9油藏长期注水后储层特征的变化及产生机理,通过室内物理模拟实验方法,结合矿场2口检查井取心分析结果,研究了注水前后储层物性、孔喉特征和渗流特征的变化。结果表明:长期注水后,由于注入水对储层的作用主要集中在孔隙的喉道部分,储层渗透率明显增大,孔隙度增加较小;储层物性的增加主要与水洗后粘土矿物含量的降低、水洗程度、储层初始渗透率大小和裂缝的开启有关,其中裂缝开启对储层物性的影响最显著;水洗后储层岩石表面油膜脱落,岩石润湿性由亲油性变为亲水性。以上综合作用的结果使油水两相流动能力增强、两相区范围变宽,水驱油效率增大。可见马岭油田南二区延9油藏注水开发中储层的变化有利于油田开发。 相似文献
19.
王庄油田强水敏性稠油油藏热采开发研究 总被引：4，自引：0，他引：4
SHI Dian-hai )) ) Nanjing Institute of Geology Palaeotology Chinese Academy of Sciences Nanjing ) Geological Scientific Research Institute of Shengli Oilfield Company SINOPEC Dongying 《地层学杂志》2007,(Z2)
王庄油田位于山东东营凹陷北部陡坡带,其主力含油层系沙一段黏土含量高达13%,水敏指数超过70%,属强水敏性稠油油藏。强水敏性成为制约其能否采用注蒸汽开发的关键。为此,在分析形成储层强水敏地质原因的基础上,采用水敏流动试验、高温物理模拟实验和数值模拟等方法,利用激光拉曼、X-衍射、核磁和CT等技术手段,开展了储层水敏机理、热采过程中骨架矿物、黏土矿物和储层物性变化规律研究。结果表明:随温度的升高骨架矿物逐步溶蚀、膨胀性黏土矿物发生转化;在温度高于250℃时渗透率可恢复到原始值的80%左右,证明了该类油藏热采开发的可行性;结合热采过程中温度场的变化,建立了强水敏稠油油藏热采储层物性变化模式。该成果在矿场应用中取得理想效果,可为同类油藏的开发提供借鉴。 相似文献
20.
对于注水开发多年,尤其是多次采取增产增注措施后的油藏,如何准确地判定低渗透非均质储集层渗流特征及其演化规律,难度比较大。针对火烧山低渗透裂缝性油藏,根据不稳定试井曲线识别储层模型,分析了不同开发阶段储层渗流系统的演化规律。由于火烧山油田天然裂缝发育,而且多数井采用压裂方式进行投产,开发初期储层模型主要表现为人工裂缝或双孔模型。开发过程中,随着地层压力的降低及调剖堵水措施的实施,油井渗流特征往单孔模型转变、注水井渗流系统向径向复合模型转变;渗流系统的演化改变了储层的有效渗透率,使其整体上呈现降低的趋势。储层初期有效渗透率场与油井水窜特征基本吻合,有效渗透率的逐步下降与油藏含水上升速度的下降基本吻合,从而为油藏下一步开发调整可行性评价提供了重要依据。 相似文献