摘要
针对东坪基岩水驱气藏压力恢复试井曲线特征复杂、模型识别困难的问题,采用时间推移试井解释手段,开展东坪气藏压力恢复试井曲线特征和模型诊断研究,在东坪1区基岩储层特征研究的基础上,对比分析了该气田的历史试井资料,得到了对该气藏压力恢复曲线共性特征的规律性认识。研究表明,该气藏压力恢复曲线普遍存在双孔介质特征和水侵特征,早期具有半球形流动及变井储特征。受边水推进的影响,部分井表现出径向复合介质特征。此外,水锥的形成和井筒气液分离现象在一定程度上掩盖了水平井和压裂井的线性流动特征。最后提出了改进该气田不稳定试井工艺及资料解释的对策。研究成果有助于正确识别该气藏压力恢复曲线的基本特征,选择正确的试井解释模型组合,提高试井资料解释成果的可靠性和准确性,同时对水驱气藏疑难试井资料解释具有普遍指导意义。
Aiming at the problem of the complex characteristics of pressure buildup test curve and the difficulty of model identification in Dongping bedrock gas reservoir,the characteristics of pressure buildup well test curve and model diagnosis of Dongping gas reservoir were studied by time-lapse well test interpretation method.Based on the study of the characteristics of bedrock reservoir in Dongping 1 area(DP1),through compared and analyzed the historical well test data of this gas field,the general characteristics of the pressure buildup curve of the gas reservoir were obtained.The results show that the pressure buildup curve in this gas reservoir is characterized by dual porosity media and water invasion,and has hemispherical flow and change-wellbore storage in early stage.Under the influence of edge-water propulsion,some wells show the characteristics of radial composite medium.In addition,the formation of water cone and gas-liquid separation of wellbore mask the linear flow characteristics of horizontal and fractured wells to some extent.At last,the countermeasures to improve the pressure transient test technology and data interpretation in this gas field were put forward.The research results are helpful to correctly identify the basic characteristics of the pressure buildup curve of this gas reservoir.Choose the appropriate well test method and the right combination of well test interpretation models,and improve the reliability and accuracy of well test interpretation results.At the same time,it has general guiding significance for the interpretation of complex well test data in water drive gas reservoirs.
作者
谢晶
罗沛
杨云
柴小颖
杨会洁
陈芳芳
张凯利
Xie Jing;Luo Pei;Yang yun;Chai Xiaoying;Yang Huijie;Chen Fangfang;Zhang Kaili(College of Oil and Gas Engineering, Chongqing University of Science and Technology, Chongqing 401331, China;Research Institute of Exploration and Development Petro China Qinghai Oilfield Company, Dunhuang, Gansu 736202, China)
出处
《非常规油气》
2020年第3期90-95,共6页
Unconventional Oil & Gas
基金
中国石油重大科技专项“柴达木盆地老气区控水稳气及新气区高效开发技术研究”(2016E-0106GF)资助。
关键词
东坪气田
水驱气藏
试井解释
模型诊断
Dongping gas field
water drive gas reservoir
well test interpretation
model diagnosis
