长北气田油管整体腐蚀速率缓慢,但某气井在多臂井径检测中发现,该油管局部腐蚀速率增大,远远大于整个气田的油管腐蚀速率和该井前期的腐蚀速率.进行了水质、气质组分分析、多臂井径检测和腐蚀挂片等试验,分别对腐蚀挂片的宏观形貌及腐蚀产物进行了分析,并结合油管的腐蚀程度和腐蚀情况,对该井油管腐蚀速率突然加快的原因及腐蚀机理进行了分析.结果表明:该井油管腐蚀主要原因是CO2导致的电化学腐蚀,整体腐蚀速率不高.油管局部腐蚀速率加快的原因是后期地层产水量增加,矿化度升高,促进了局部点蚀成型后的"深挖"效应,使得腐蚀速率呈非线性增加;水中Cl-浓度较高,进一步提高了腐蚀速率.

针对靖边气田气井作业和生产过程中,由于水基工作液侵入或生产中地层水、凝析液在井底聚集,使井筒附近储层含水饱和度上升,导致储层气相渗透率降低,气井生产能力变差的情况,通过开展毛细管自吸率、毛细管自吸量分析,进一步深化了对储层水锁效应的认识,并结合平面径向渗流模型和实例分析,基本掌握了水锁对靖边气田气井产能的影响.

Sulige gas field is the typical reservoir of low permeable sand rock, with the complex space structure of layer rocks, and the obvious feature of pressure sensibility. At present, gas fields adopt two production modes of controlling the output and releasing pres- sure. Since there is large difference between the dynamic features of both modes, gas fields cannot clearly understand the principle of gas permeable flow and its influence on gas well productivity. So it is necessary to make the further evaluation on the influence of two production modes on the exploitation efficiency. Based on the analysis of rock core experiment, through the evaluation on the pressure sensibility of reservoir layers, the permeability flow formula of gas well under the condition of pressure sensibility has been established in this paper, followed by the quantitative evaluation on the productivity feature of gas wells under the pressure sensibility. Meanwhile, combined with the practical dynamic data, the pressure sensibility parameter of permeability has been revised, together with the analysis and prediction of production dynamics duting the post production of gas well exploitation. In addition, the quantized contrastive analysis is focused on the influences of pressure sensibility on the exploitation efficiency under the different production modes in order to optimize the allocation and improve the level of gas field exploitation.

靖边气田北部上古气井目前主要是采用"一点法"评价产能,测试成本较高、时间也较长。同时,测试要放空烧掉大量的天然气,造成一定程度的浪费。为了实现对低渗及特低渗致密气井(藏)产能的准确评价,减少试气过程中的资源浪费和缩短试气周期,通过分析气井产能与压后关放曲线的关系,提出了用压后关放排液的特征曲线预测气井产能,指导气田生产。

利用压恢试井资料中的压恢数据进行动态储量计算,主要利用压力恢复法和压差曲线法对20余口气井进行了动储量计算,并且通过对比分析评价该方法的可靠性。

气井的地层压力是计算地质储量、确定地层特性、了解油气藏目前动态以及预测未来动态的一项必不可少的基础数据。靖边气田储层属于低渗透、低丰度、大面积、薄储层、非均质性强的特征,常规方法气井关井后压力恢复时间很长,受气田外供任务影响,难以有效开展针对性实施。本文提出几种求取目前地层压力的简介方法。最后在实例中将这些方法计算结果与实测地层压力对比,综合优选出求取地层压力的最佳方法。

Aim The multidisciplinary analysis on the differential research of M5 2 1 and M5 2 2 reservoir in Shaan 200 borefild of Jingbian Gas Field in Ordos Basin.Methods Relying on dynamic data of exploration wells,producible wells,appraisal wells and predecessors' research,the methods of core observation,thin section analysis,lithology-electric property interpretation were used to multidisciplinarily analyse the characteristics and contributing factor of on reservoir.Results M5 2 1 which is deposited in the deep water have higher content of muddy and the precipitation facie is mainly dolomite tidal flat,but that of M5 2 1 is mainly sekkoko dolomite tidal flat.The ancient valley-troughs carried muddy and deposit of overlying formations harmfully filling M5 2 1 so that the diagenesis havoc reservoir rocks.The cavalcade of the ancient valley-troughs in M5 2 2 benefit for reservoir rocks so that denudation increased a lot of corroded hollows and fractures.Conclusion The hydrocarbon pore volume of M5 2 1 is limitted and gas areas are very small,but in M5 2 2 the hydrocarbon pore volume is vegetal and thick gas bearing formations are much more,so M5 2 2 is good quality reservoir.

目的 对鄂尔多斯盆地靖边气田陕200井区马五21、马五22储层差异性进行对比分析.方法 在研究区评价井、探井、生产井动态资料解释和前人研究工作的基础上,通过岩心观察、薄片分析、岩电解释的方法剖析差异性及其控制因素.结果 马五21沉积时水体较深,沉积微相以云坪为主,但泥质含量较高,含膏云坪微相不发育;马五22沉积时水体较浅,含膏云坪微相很发育;马五21由于受泥质含量高和古沟槽携带上覆地层沉积物充填的不利影响,以破坏性成岩作用为主,孔隙和裂缝被严重充填;马五22古沟槽的发育过程对储层有建设性意义,溶蚀作用强烈,溶孔、微裂缝发育.结论 沉积-成岩作用是两个储层产生差异的根本原因,马五21孔隙组合类型主要为孔-缝型和孔隙型,气层零星分布;马五22孔隙组合类型主要为孔-缝-洞型和孔-缝型,天然气富集,气层连片发育且厚度较大.

Since Majiagou-51+2 gas reservoir of Jingbian gas field has serious heterogeneity, it is significant to quantify, understand and appraise the heterogeneity for development layer adjustment and well infilling at middle or late stage of field development. Therefore, based on core analysis data, great amount of calculation and analysis on the variation coefficient, dart coefficient and deference of heterogeneity have been conducted for Majiagou-5 formations to make clearer the heterogeneity in and between layers.

靖边气田马五1+2气藏非均质性强,定量化地描述其储层的非均质性、深入认识和评价储层的非均质性,这对科学指导气田开发中后期的层位调整和开发井加密调整具有积极意义.为此,以岩心物性分析资料为基础,采用统计方法对马五储层非均质性的变异系数、突进系数及级差等进行了大量计算分析,对储层层内及层间非均质性得出了全面而深入的认识.

Pressure is the essential factor to consider in gas field development. One of the key difficulties encountered in Jingbian Gasfield Development is how to obtain the accurate current formation pressure. On the one hand, since Jingbian Gasfield features low permeability, low abundance, large in area, thin reservoir, obvious heterogeneity and large production well interval (generally>2.5 km), it takes as long as several months to reach stability after pressure build-up upon re-startup. On the other hand, Jingbian Gasfield has been experiencing high daily gas yield in recent years and the chances to shut down well and measure pressure is rare. These factors attributed to the difficulty to measure current formation pressure. It presents a problem that has to be solved in developing low permeability gas reservoirs like Jingbian Gasfield, that is, how to achieve production target while still sustaining reservoir study with minimum monitoring activities. In line with geological characteristics of Jingbian Gasfield, based on continuous research and accumulation, the comprehensive technology has gradually been developed to measure current formation pressure, including building monitoring well network, setting up dedicated pressure monitoring well, well testing for pressure build-up on small scale and whole block shutdown for pressure measurement.

储量是一个气田的物质基础,如何确定动储量及动储量的大小是气田开发中首先必须解决的问题.目前主要采用压降法确定动态地质储量.由于低渗透气藏渗流规律的特殊性,导致其压降储量曲线也表现出特殊规律.如果仍然按照普通气藏的处理方法计算低渗透气藏动态储量,会导致认识上的偏差及计算结果的失真.