共查询到10条相似文献，搜索用时 140 毫秒
1.
Accepted practice dictates that waterflooding of gas reservoirs should commence, if ever, only when the reservoir pressure has declined to the minimum production pressure. Analytical proof of this hypothesis has yet to appear in the literature however. This paper considers a model for a gas-water reservoir with a variable production rate and enhanced recovery with waterflooding and, using an initial dynamic programming approach, confirms the above hypothesis. 相似文献
2.
通过对马王庙油田马36井区与王场油田潜四段沉积环境、岩性、孔隙结构、注水开发效果对比,分析认为两区沉积微相、岩性、物性及孔隙结构均存在一定差异。因此,马36井区注水开发效果与王场潜四段相比,在水线推进速度、含水上升规律、稳产时间、水驱采收率等方面存在较大差异。说明不同的储集层特征对注水开发效果影响较大,应对不同的储集层特征制定不同的开发方案。 相似文献
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In a recent paper, we developed a physics-based data-driven model referred to as INSIM-FT and showed that it can be used for history matching and future reservoir performance predictions even when no prior geological model is available. The model requires no prior knowledge of petrophysical properties. In this work, we explore the possibility of using INSIM-FT in place of a reservoir simulation model when estimating the well controls that optimize water flooding performance where we use the net present value (NPV) of life-cycle production as our cost (objective) function. The well controls are either the flowing bottom-hole pressure (BHP) or total liquid rates at injectors and producers on the time intervals which represent the prescribed control steps. The optimal well controls that maximize NPV are estimated with an ensemble-based optimization algorithm using the history-matched INSIM-FT model as the forward model. We compare the optimal NPV obtained using INSIM-FT as the forward model with the estimate of the optimal NPV obtained using the correct full-scale reservoir simulation model when performing waterflooding optimization. 相似文献
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松辽盆地头台油田现代地应力场分布特征研究 总被引：7，自引：0，他引：7
在油气田开发,尤其是低渗透油田的开发过程中,井网布局与地应力的分布紧密相关。运用现场直接测量、岩芯观察、室内实验、数值模拟相结合的方法,对头台油田现代地应力分布特征进行的详细研究表明：头台油田水平最大主应力（人工裂缝）方向为N100°-120°E;天然裂缝方向在N0°-50°E之间;地层中三向应力为南部较小,北部较大,构造断裂与天然裂缝的走向近拟平行。因此,井网布局为：并排与人工裂缝及天然裂缝呈45°,300m×300m切割注水井风;注水压力应小于最小主应力值,采用不稳定间歇注水。 相似文献
6.
低弯度分流河道储层是杏北油田的重要储层类型,深入研究其储层构型特征对于油田调整挖潜意义重大。综合密井网岩心、测井和生产动态等资料,采用“层次分析和模式指导”的方法,分“复合河道和溢岸砂体、单期河道及其相互接触关系”两个主要层次开展储层构型精细解剖,构建了三维储层构型模型。基于密闭取心井、水淹层测井解释资料和生产动态数据分析了不同时期的水淹特征和剩余油分布,并通过基于三维构型模型的油藏数值模拟对剩余油分布模式进行验证,最终总结出不同储层构型控制下的剩余油富集模式。结果表明,在河道内,剩余油在顶部、边部、河道间夹层控制部位以下以及仅与低渗溢岸砂连通造成注采不完善的河道内部富集;在河道外,剩余油在河间物性较差的溢岸砂内、注采不完善的溢岸砂末端和孤立砂体内富集。 相似文献
7.
Xue Li Jinliang Zhang Longlong Liu Zhongli Fan Guangxue Zhang Ningning Meng 《Arabian Journal of Geosciences》2018,11(14):380
Fracture is one of the most important factors through the whole process of low-permeability reservoir development. Biandong oilfield is a typical low-permeability fractured sandstone reservoir, and has stepped into high water cut stage; thus, the waterflooding effect is poor. Therefore, many contradictions such as high moisture content, decreasing production speed, and low recovery efficiency are becoming increasingly prominent, which have seriously hindered the sustainable development, and need to be solved urgently. However, few such studies on reservoir characterization in low-permeability fractured sandstone reservoir have been conducted in China. In this study, through comprehensive analysis on reservoir characterization and sedimentary environment, significant results are achieved. Three types of fracture occurrence are identified; they are high-angle fracture, low-angle fracture, and horizontal fracture, respectively. Two types of reservoir pore (primary porosity and secondary porosity) are recognized based on thin-section observation and analysis. The diagenetic stage of Biandong oilfield are divided into three stages, early A, early B, and late A, respectively. Finally, a regional discrete fracture network model is established with Fisher’s algorithm based on three-dimensional geological model. All the research results presented above can make a significant instructing function for making reservoir development plan and improving recovery efficiency. 相似文献
8.
A new and pragmatic technique has been developed to efficiently optimize well pattern parameters for improving waterflooding sweep efficiency in an anisotropic formation. Theoretically, the dependence of the optimal incline angle between a well array and the principal permeability direction on the anisotropy ratio and well pattern coefficient have been characterized for regular and irregular square inverted nine-spot (SINS) well patterns, respectively. It has also been proved that the potential for improving the performance of the rhombus inverted nine-spot well pattern by rotating the well pattern parameters is negligible. For the regular SINS well patterns, the optimal incline angle increases with increasing anisotropy ratio. Regarding the irregular SINS well pattern, the dominant factor affecting the waterflooding sweep efficiency shifts from the anisotropy ratio to the well pattern coefficient with a gradual decline of the latter factor. Subsequently, the newly proposed methodology has been validated using both synthetic homogeneous and heterogeneous models with various anisotropy ratios, then extended to a realistic oil reservoir. The model validation has demonstrated that the newly developed technique can be used to accurately optimize the optimal incline angle for both homogeneous and slightly heterogeneous formations, yet its potential is limited for strongly heterogeneous formations. In addition, field applications have indicated that an increment of 2.3 % in cumulative oil production can be achieved by rotating the targeted well pattern using the proposed technique. 相似文献
9.
排采管控方法对煤层气储层动态渗透率具有显著影响。基于煤层气井不同排采阶段渗透率的主控因素，以提高和改善渗透率为目标，提出了针对性的排采对策。井底流压大于原始储层压力时，降压速度为0.03~0.05 MPa/d，可降低压裂液和速敏伤害；井底流压在原始地层压力和解吸压力之间时，以小于0.03 MPa/d的速度降压，避免加剧储层"渗透率漏斗"；在解吸压力以上0.2~0.3 MPa时开始以0.01 MPa/d速度降压，在解吸压力附近稳压排水30 d，解吸后套压控制在0.2~0.3 MPa左右，避免两相流造成的水相渗透率下降；提产段通过变速提产强化基质收缩作用改善储层渗透率；稳产段主要通过单位压降增产量来确定合理的稳产产量，实现煤层气井长期高产稳产。现场试验表明，该方法取得了较好的应用效果。 相似文献
10.
Waterflooding using closed-loop control 总被引：2，自引：0，他引：2
To fully exploit the possibilities of “smart” wells containing both measurement and control equipment, one can envision a
system where the measurements are used for frequent updating of a reservoir model, and an optimal control strategy is computed
based on this continuously updated model. We developed such a closed-loop control approach using an ensemble Kalman filter
to obtain frequent updates of a reservoir model. Based on the most recent update of the reservoir model, the optimal control
strategy is computed with the aid of an adjoint formulation. The objective is to maximize the economic value over the life
of the reservoir. We demonstrate the methodology on a simple waterflooding example using one injector and one producer, each
equipped with several individually controllable inflow control valves (ICVs). The parameters (permeabilities) and dynamic
states (pressures and saturations) of the reservoir model are updated from pressure measurements in the wells. The control
of the ICVs is rate-constrained, but the methodology is also applicable to a pressure-constrained situation. Furthermore,
the methodology is not restricted to use with “smart” wells with down-hole control, but could also be used for flooding control
with conventional wells, provided the wells are equipped with controllable chokes and with sensors for measurement of (wellhead
or down hole) pressures and total flow rates. As the ensemble Kalman filter is a Monte Carlo approach, the final results will
vary for each run. We studied the robustness of the methodology, starting from different initial ensembles. Moreover, we made
a comparison of a case with low measurement noise to one with significantly higher measurement noise. In all examples considered,
the resulting ultimate recovery was significantly higher than for the case of waterflooding using conventional wells. Furthermore,
the results obtained using closed-loop control, starting from an unknown permeability field, were almost as good as those
obtained assuming a priori knowledge of the permeability field. 相似文献