A Water Breakthrough Time Prediction Method for Edge Water Gas Reservoirs
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A water-gas and water-penetration technology, applied in forecasting, data processing applications, instruments, etc., can solve the problems of many parameters, heavy workload, difficult to meet the water intrusion warning of gas wells in edge water gas reservoirs, etc., and achieve the effect of slowing down the advance speed.
Active Publication Date: 2020-05-26
CHINA PETROLEUM & CHEM CORP +1
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[0004] The purpose of the present invention is to solve the defects of low accuracy of water breakthrough time in edge water gas reservoirs predicted by the prior art, and the conventional numerical simulation method requires many parameters and heavy workload, which makes it difficult to meet the needs of early warning of water intrusion in gas wells in edge water gas reservoirs. A Prediction Method of Water Breakthrough Time in Edge Water Gas Reservoirs
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[0032] 为使本发明目的、技术方案和优点更加清楚,以中原油田普光气藏主体气藏为例,结合附图对本发明作进一步描述。 Depend on figure 1 可知,本发明包含以下步骤。
[0038] 利用步骤1的测井解释数据,对普光气藏边水区气井进行测井解释,绘制如 image 3 , Figure 4 , Figure 5 , Image 6 及表1所示的测井解释组合图,确定单井储层纵向非均质特征。 Depend on image 3 、表1可知,普光北部普光105-1H井纵向上储层段由底部的TSQ1-Ⅲ层序往上TSQ1-Ⅵ层序储层渗透率逐渐减小,总体呈现呈上差下好形式,普光104-1、104-3、103-1等3口气井储层特征与普光105-1H井相似;由 Figure 4 、表1可知,普光中北部的普光105-2井纵向上中间Ⅴ层序渗透率较小,往下Ⅱ层序及往上Ⅵ层序渗透率变大,总体呈现两端好中间差,普光103-2储层特征与普光105-2井类似;由 Figure 5 、表1可知,普光中南部的普光103-4井纵向上中间Ⅴ层序渗透率较高,往下Ⅲ层序及往上Ⅵ层序渗透率变小,总体呈现两端差中间好的特征 ;Depend on Image 6 , Table 1. It can be seen that the vertical upper reservoir section of We...
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Abstract
The invention belongs to the petroleum and natural gas development technical field and discloses an edge water gas reservoir water breakthrough time prediction method. The method includes the following steps that: edge water gas reservoir geological data and analysis test data are obtained; a three-dimensional geological model under combination modes of four kinds of heterogeneous reservoir stratums is established, and a gas area and an edge water area of an edge water gas reservoir are divided, and a virtual well is established in the gas area of the edge water gas reservoir; and the gas well water breakthrough time of the edge water gas reservoir under the combination modes of the different kinds of heterogeneous reservoir stratums can be accurately predicted through using response relationships between the gas well water breakthrough time and the heterogeneous feature parameters of the reservoir stratums. The method can be used for guiding the adjustment of gas reservoir development work systems. With the method adopted, the output of a well which is to be subject to water breakthrough can be decreased timely, and production pressure difference can be controlled; the advance speed of edge-bottom water can be effectively slowed down; and therefore, technical support can be provided for long-term stability of edge water gas reservoirs.
Description
technical field [0001] 本发明涉及石油和天然气开发技术领域,具体一种边水气藏见水时间的预测方法。 Background technique [0002] 在水驱气藏的开发中,水侵的早期识别是充分利用无水期进行生产与主动地实施治水措施的前提。在开发全过程中,必须不断加强地层水监测及水侵动态跟踪分析预测,根据地层水推进状况做好气井调配,进一步做好地层水防治,有利于提高气藏稳产期和气藏最终开发效益。 [0003] 目前常用的边水气藏见水预测方法主要有以下两种:(1)气藏工程法,假设地层均质同性,利用气水两相渗流的基本规律,通过数学推导,得到边水气藏水舌进突破时间的预测方法,如《边水气藏气井见水时间预测方法》(王会强等.特种油气藏.2008 / 04),该方法考虑了气水流度比、残余气饱和度、储层厚度、孔隙度、距边水距离、气井产量等对气井见水时间的影响,在相对均质的储层中,实践证明具有一定的实用性。但由于该方法考虑不了储层的非均质性,对于非均质较严重的储层,见水时间误差很大。(2)数值模拟法,直接建立区块数值模拟模型来研究边底水的推进是一种普遍手段,但由于其要求参数多,工作量大,特别是在气藏开发早期的现场应用中存在一定的局限性。 Contents of the invention [0004] 本发明的目的是针对现有技术预测的边水气藏见水时间精度低,常规数值模拟方法要求参数多、工作量大而难以满足边水气藏气井水侵预警的需要等缺陷,提供了一种边水气藏见水时间的预测方法。 [0005] The present invention comprises the following steps: [0006] 1、获取边水气藏地质资料和分析化验数据。 [0007] 收集边水气藏地质资料和分析化验数据。其中,地质资料包括地震、钻井、测井、录井数据;分析化验数据包括流体高压物性、岩心相渗实验数据。 [0008] 2、依据边水气藏非均质特征,建立不同非均质储层组合形式的三维地质模型,划定边水气藏的气区和边水区,在边水气藏的气区中建立虚拟井。 [0009] 2.1结合边水气藏地质资料,利用储层预测软件,开展边水气藏储层展布研究,结合生产测井资料,明确气藏纵向上储层非均质特征,划定边水气藏不同非均质储层的组合形式...
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