缝洞型底水气藏水平井水侵动态数学模型与影响因素研究

发布时间：2018-01-21 08:09

本文关键词： 缝洞型气藏临界产量水锥突破时间渗透率变异模型底水锥进　出处：《现代地质》2017年03期 　论文类型：期刊论文

【摘要】：在含有底水的气藏开发过程中,随着气体的采出,气井井底压力逐渐降低,底水会发生向上锥进的现象,严重影响产气。因此若能预先求得气井水侵动态,这对于开发底水气藏具有重要的意义。同时,与常规底水气藏不同,缝洞型底水气藏呈现出三重介质的特性,溶洞和天然裂缝较发育,其非均质性较强,气体渗流的过程更为复杂。通过采用渗透率变异处理储层中裂缝、溶洞的发育,考虑到裂缝和溶洞的存在仅改变了储集层的渗透率,同时在均质底水气藏水平井水锥动态计算方法的基础上,利用渗透率变异理论建立了缝洞型底水气藏临界产量和水锥突破时间公式,并对其影响因素进行了分析。根据所得公式可以近似求解缝洞型底水气藏中水平井的临界产量、见水时间以及见水位置,可用来指导实际缝洞型储层水平井的合理开发,延缓开发过程中底水锥进,延长见水时间,同时还可以确定见水位置为后续压锥及堵水调剖的实施提供依据。通过建立的数值模拟模型以及实际生产数据,验证了本方法研究的可靠性,数值模拟结果从直观上展示了缝洞型底水气藏水平井水锥研究的正确性。
[Abstract]:In the process of gas reservoir development with bottom water, with the gas recovery, the bottom pressure of gas well gradually decreases, and the bottom water will be tapered upward, which will seriously affect the gas production. Therefore, if we can get the water invasion performance of gas well in advance. This is of great significance to the development of bottom water gas reservoirs. At the same time, different from conventional bottom water gas reservoirs, the fracture-cavity bottom water gas reservoirs show the characteristics of triple medium, and the caverns and natural fractures are relatively developed, and their heterogeneity is strong. The process of gas percolation is more complicated. By using permeability variation to deal with the fractures in the reservoir, the development of cavities, considering the existence of fractures and caverns, only changes the permeability of reservoir. At the same time, on the basis of the calculation method of water cone performance of horizontal well in homogeneous bottom water gas reservoir, the formula of critical production and water cone breakthrough time of fractured bottom water gas reservoir is established by using permeability variation theory. According to the formula, the critical production rate, water breakthrough time and water location of horizontal wells in the fractured bottom water gas reservoir can be approximately solved. It can be used to guide the rational development of horizontal wells in the actual fractured and cavernous reservoirs, delay the bottom water coning in the development process, and prolong the water breakthrough time. At the same time, the location of water can be determined to provide the basis for the implementation of the subsequent pressure cone and profile control. The reliability of this method is verified by the established numerical simulation model and actual production data. The numerical simulation results show the correctness of the research on the water cone of the horizontal well in the fractured-cave bottom water gas reservoir.
【作者单位】：中国地质大学(北京)能源学院;中国石油勘探开发研究院;
【基金】：国家科技重大专项“超高压有水气藏高效开发技术”(2016ZX05015-002);国家科技重大专项“稠油、碳酸盐岩和致密油藏开发主体技术与应用潜力”(2016ZX05016-006)
【分类号】：TE37
【正文快照】： 0引言国内外很多气田为碳酸盐岩储层,储集体大多表现为缝洞型的特性,气田埋藏较深且大多数含有边底水,这使得这类型的气田的开发较常规砂岩有水气藏的开发难度大大增大,水侵动态规律的研究是碳酸盐岩储层有水气藏在开发过程中所要解决的重点问题。底水气藏水侵动态研究的主要

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