迪那2超高压气田气井流压异常修正方法研究

发布时间：2018-06-13 02:39

本文选题：高压气井 + 流压异常　；参考：《中国地质大学（北京）》2015年博士论文

【摘要】：目前国内天然气随着钻探领域的不断深入，一些深层高压气田成为近期开发的主力，这些气田由于储层埋藏深、地层压力高,动态监测成本高风险大，此外，复杂的井筒工艺状况导致监测资料出现异常的频率高。迪那2超高压气田是西气东输的主力气源之一，该气田在开采过程中受井筒工艺影响，，多数井存在持续的流压监测异常现象，严重影响了对气井稳产能力判断，使得生产调控措施制定存在盲目性和风险。针对这类流压异常井的识别诊断和跟踪修正是该气田开发跟踪中首先要解决的问题。论文调研了超高压气田储层应力敏感性文献，消除了应力敏感导致气井流压异常这一判断。同时针对气井流压异常诊断与修正方法开展了国内外文献调研，系统总结了以Blasingame递减曲线图版和Agarwal-Gardner递减曲线图版为主气井现代产量递减分析发展历程，剖析了其中气井流压异常诊断与跟踪模拟方法在迪那2气田气井流压异常分析中的局限性。根据气体高压阶段（P50MPa）PVT特征，对现代产量递减分析中的“压力”、“产量”和“时间”等关键参数的形式进行了简化，建立了高压气井的标准流动曲线和流压异常诊断图版。与原有的气井标准流动曲线和诊断图版相比，高压气井标准流动曲线和诊断图版既保留原有的功能，又节约了计算流程和工作量，在应用时直接利用生产数据，不需要进行任何复杂的计算程序和专业软件，便于矿场日常分析计算。从确定的高压气井标准流动曲线的形式来看，气体在高压阶段可压缩性差，刚性强，具有准液体性质，因此高压气井的标准流动曲线形式与油井的标准流动曲线形式相似。利用连通气藏生产过程中不同部位流压下降特征，确定了单井控制储量比例（井控储量/气藏总储量）与单井产量比例（单井产量/气藏总产量）线性正相关系，建立了考虑井间干扰情况下井底流压跟踪修正方法，克服传统方法由于无法考虑邻井产量变化和气田总体调产的影响，而导致的修正后井底流压与气田总体变化趋势不符现象。对迪那2气田流压异常井开展了诊断与跟踪修正，该气田流压异常井在诊断图版上均表现出流动曲线在后期向下偏离标准曲线现象，说明井筒摩阻异常，井底流压计量偏低。异常井修正后流压变化趋势与正常井变化趋势一致，符合连通气藏特征。根据修正结果开展了气井生产制度合理性评价，指出部分井配产高，生产压差大，存在水侵风险，应进一步降低气井产量。
[Abstract]:At present, with the deepening of the domestic natural gas drilling field, some deep high pressure gas fields have become the main force in recent development. These gas fields are characterized by deep reservoir burial, high formation pressure, high dynamic monitoring cost, and high risk. Complex wellbore process conditions lead to high frequency of abnormal monitoring data. Dina 2 ultra-high pressure gas field is one of the main gas sources for gas transmission from west to east. The gas field is affected by wellbore technology in the process of production, and there is a continuous abnormal flow pressure monitoring phenomenon in most wells, which seriously affects the judgement of stable production ability of gas wells. Make production control measures to formulate blindness and risk. The identification, diagnosis and tracking correction of this kind of abnormal fluid pressure wells are the first problems to be solved in the development and tracking of the gas field. In this paper, the stress-sensitivity literature of the reservoir in ultra-high pressure gas field is investigated, and the judgment of abnormal flow pressure caused by stress sensitivity is eliminated. At the same time, based on the domestic and international literature investigation on the abnormal diagnosis and correction method of gas well flow pressure, the development history of modern production decline analysis of gas well is systematically summarized, which is mainly composed of Blasingame decline curve and Agarwal-Gardner decline curve. The limitation of gas well flow pressure anomaly diagnosis and tracking simulation method in Dina 2 gas field is analyzed. According to the characteristics of P50MPA / PVT in gas high pressure stage, the forms of "pressure", "production rate" and "time" in modern production decline analysis are simplified, and the standard flow curve of high pressure gas well and the diagnostic chart of abnormal flow pressure are established. Compared with the original standard flow curve and diagnostic chart of gas well, the standard flow curve and diagnostic chart of high pressure gas well not only retain the original function, but also save the calculation flow and workload. There is no need for any complicated calculation program and professional software to facilitate the daily analysis and calculation of the mine. Judging from the determined form of the standard flow curve of high pressure gas wells, the compressibility, rigidity and quasi-liquid property of gas in high pressure gas wells are poor, so the standard flow curves of high pressure gas wells are similar to the standard flow curves of oil wells. The linear positive phase relationship between single well controlled reserve ratio (well controlled reserve / total gas reservoir reserve) and single well production ratio (single well production / gas reservoir total production) is determined by using the characteristics of flow pressure drop in different parts of connected gas reservoir. A correction method for bottom hole flow pressure tracking considering inter-well interference is established to overcome the phenomenon that the modified bottom hole flow pressure does not conform to the general change trend of gas field due to the inability of the traditional method to consider the effects of the production change of adjacent wells and the overall regulation of the gas field. The abnormal well of flow pressure in Dina 2 gas field has been diagnosed and corrected. The flow curve of abnormal well shows the phenomenon of deviation from the standard curve in the later period, which indicates that the friction of wellbore is abnormal and the measurement of flow pressure in bottom hole is low. The change trend of flow pressure after correction of abnormal wells is consistent with that of normal wells, and accords with the characteristics of connected gas reservoirs. According to the revised results, the rationality evaluation of gas well production system is carried out, and it is pointed out that the production rate of gas wells should be further reduced because of the high production distribution, the large production pressure difference and the risk of water invasion in some wells.
【学位授予单位】：中国地质大学（北京）
【学位级别】：博士
【学位授予年份】：2015
【分类号】：TE35

【参考文献】