高倾角近临界油气藏流体及开发特征研究

发布时间：2018-05-27 10:41

本文选题：高倾角 + 近临界态　；参考：《特种油气藏》2017年03期

【摘要】：渤中13-1油田高倾角近临界油气藏在开发过程中,当地层压力下降到饱和压力以下后,油井生产气油比依然稳定,针对该异常现象,通过流体PVT实验、油气表面张力测试实验和储层孔喉特征分析,结合实际生产资料对该油藏产生异常生产动态的原因进行了研究。结果表明:流体属于临界—近临界态流体,相态受温度影响大,表现为构造高部位为近临界挥发性油藏,构造低部位为近临界凝析气藏;存在"上重下轻"的组分梯度特点,即构造顶部的流体最重,随着深度增加,重质组分含量逐渐减小,构造低部流体最轻;低于饱和压力后油气体系属于低界面张力体系,形成自由气相的时间长,延缓了脱气进程;储层孔洞发育,但孔喉比大,在贾敏效应的作用下形成大量"阁楼气",不能参与流动。该研究丰富了高倾角近临界油气藏的开发实例,对同类油田的开发具有借鉴意义。
[Abstract]:During the development of the near critical oil-gas reservoir with high dip angle in Bozhong 13-1 oilfield, the ratio of gas to oil produced by the oil well is still stable after the local formation pressure drops below the saturation pressure. In view of this abnormal phenomenon, the fluid PVT experiment is carried out. The oil and gas surface tension test experiment and pore throat characteristics analysis of the reservoir, combined with the actual production data, to study the causes of abnormal production performance of the reservoir. The results show that the fluid belongs to the critical to near critical state, and the phase state is greatly affected by temperature, which shows that the high structural part is a near critical volatile reservoir, the low part of the structure is a near critical condensate gas reservoir, and the component gradient characteristic of "upper heavy down light" exists. That is, the fluid at the top of the structure is the heaviest, with the increase of depth, the content of the heavy component gradually decreases, the fluid in the lower part of the structure is the lightest, and the oil and gas system belongs to the low interfacial tension system after the saturation pressure, and the time of forming free gas phase is long. The process of degassing is delayed, and the porosity and pore throat are developed, but the ratio of pore to throat is large. Under the action of Jamin effect, a large amount of "attic gas" is formed, which can not participate in the flow. This study enriches the development examples of near-critical oil and gas reservoirs with high dip angle and has reference significance for the development of similar oilfields.
【作者单位】：中海石油(中国)有限公司天津分公司;
【基金】：国家科技重大专项“渤海油田高效开发示范工程”(2016ZX05058)
【分类号】：TE31

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