采收率

The intraformational heterogeneity controls and affects the swept volume of the injectant in single sand layer, directly determines the waterflood efficiency, and is the key factor influencing the distribution of the remaining oil.

为此采用了细分开发层系、分层注水、开展流动单元精细研究等地质和开发措施，可以有效地降低各类非均质性对油藏最终采收率的影响。

A series of profile numerical simulation are based on the datas of core flooding experiment, including the homogeneous profile positive rhythm section, the rhythm section, interlining profile, interlayer heterogeneity section, intraformational heterogeneity of reservoir section, the actual reservoir simulation. The the section of displacement mechanism of core flow method and the datas of core flooding experiments take into account, the EOR scheme of later stage is CO2 preslug followed by the N2 slug flooding, at last is the waterflooding or depletion type of drive..

为了进一步分析注CO2／N2段塞驱对扫油效率的影响，在岩芯驱替实验的基础上对N2推进CO2段塞驱进行了均质剖面、正韵律剖面、反韵律剖面、隔层剖面、层间非均质剖面、层内非均质剖面、实际油藏剖面的数值模拟研究，通过对比研究，初步认为高11油田在开发中后期提高采收率技术上可选取在适当高的压力条件下，先注前置CO2段塞驱，后续再注N2段塞顶替驱，然后再转注水或衰竭开采的驱替方式。

The invention comprises that:(1) an injectant containing air is formed and the injectant is injected into a manto (3) through an injection well (2) or a recovery well (1);(2) the pressure of the injection well (2) and the recovery well is kept (1) for a period of time so that the oil and the injectant are mixed into more uniform fluid;(3) the pressure of the injection well (2) and the recovery well (1) is decreased, the pressure of the manto(3) is decreased and the oil-containing mixed fluid is obtained from the recovery well (1) or the injection well (2);(4) the procedure of (1),(2) and (3) is repeated, the pressure fluctuation of the fluid in the manto (3) is realized until the oil recovery rate is less than the economic recovery rate.

本发明包括：①形成包含气体的注入剂，将注入剂通过注入井(2)或采收井(1)注入矿层(3)；②保持注入井(2)和采收井(1)的压力一段时间，使油分和注入剂混合形成比较均匀的流体；③然后降低注入井(2)和采收井(1)的压力，降低矿层(3)压力，并在采收井(1)或者注入井(2)获取含油混合流体；④不断重复步骤①②③，实现矿层(3)中流体的压力波动，直到石油的采收率低于经济开采率为止。

The invention is suitable for the oil production field and can be suitable for any manto so long as the displacement exploitation is possible; also the invention can be suitable for the manto that is unsuitable for the displacement exploitation due to the strong heterogeneity of the manto, which greatly breaks through the scope and recovery rate of the traditionally displacement exploitation method.

本发明适用于石油开采领域，适用于任何能够进行驱替开采的矿层；也适用于由于矿层非均匀性强烈而不适合进行驱替开采的矿层，大大突破传统驱替开采方法的范围和采收率。

In low permeability boundary oil field, applying this technology can make the field development to be profitable. In Changyuan Oii field, this technology can save a great deal of natural gas, which has significant importance to the extension of field development life and increment of EOR.

在外围低渗透油田中采用常温和低温集油化学剂技术，可使低产区块的开发由经济上不可行变为可行；在长垣油田应用低温和常温集油化学剂技术，可节约大量的天然气，这对延长油田开发周期和提高原油采收率具有十分重要的意义。

Well patterns are investigated using numerical simulation,and the parameters of injection and production are optimized after several cycles of steam stim...

研究结果表明，直井与水平井组合SAGD技术是杜84块兴Ⅵ油层组超稠油油藏蒸汽吞吐后的有效接替技术，可提高原油采收率30%，累计油汽比可达到0.296。

Coreflooding experiments indicate that the stratal microflora can improve oil recovery by 9.14% after waterflooding.

室内岩心模拟试验表明，在水驱基础上内源微生物驱可以提高采收率最高达9.14%。

Completing the selection of well pattern, establishment of hydrocarbon reservoir geologic model, and calculation of fluid PVT, and triphase relative permeability determination, and reserve fitting and history matching, the programs are designed to improve oil recovery of WAG and simulate performance prediction, and also optimize the programs.

在完成井组的选取，油气藏地质模型的建立，流体PVT相态计算，油、气、水三相相对渗透率的确定，储量拟合和历史拟合以后，研究了气水交替注入提高采收率方案设计、动态预测模拟研究，实行了开发方案的优选。

The generating reason,response characteristic and distributing rule of remaining oil was deeply studied aiming at water-flooded continental reservoir with characteristic of intense heterogeneity,high water-cut,low recovery efficiency,complex distributing rule of mobile remaining oil,intergrowth of major and untabulated formation . At the same time,a systemic method of evaluation and predicating remaining oil and pressure was put forward basing on the theory of development geology,seepage flow mechanics,fluid mechanics which resolved the hard technologic problem of predicting remaining oil and pressure.

本文针对陆相注水开发油藏具有非均质性强、含水率高、原油采收率低、可采剩余油分布复杂、主力产层和表外产层同时存在等特点，深入研究了剩余油的形成机理、响应特征和分布规律，应用开发地质学、渗流力学、流体力学和地质统计学理论，将静态地质数据和动态开发数据相结合，综合现有的与剩余油及压力分布有关的所有资料，提出了一套系统的评价和预测剩余油及压力的方法，较好地解决了目前剩余油与压力评价和预测中的技术难题。

A larger area of reserves can be managed and significant increase in the recovery ratio will be achieved by multibranch horizontal gas wells, which in fact have been used more and more widely in China.

多分支水平井能控制更大的储量面积，大幅度地提高油气藏采收率。

And Pharaoh spoke to Joseph, saying, Your father and your brothers have come to you.

47：5 法老对约瑟说，你父亲和你弟兄们到你这里来了。

Additionally, the approximate flattening of surface strip using lines linking midpoints on perpendicular lines between geodesic curves and the unconditional extreme value method are discussed.

提出了用测地线方程、曲面上两点间短程线来计算膜结构曲面测地线的方法，同时，采用测地线间垂线的中点连线和用无约束极值法进行空间条状曲面近似展开的分析。