青海涩北气田井底积液产气剖面解释方法研究

【作者】 赵志恒；

【导师】 陈科贵； 孙嘉戌；

【作者基本信息】 西南石油大学 ， 地球探测与信息技术， 2007， 硕士

【摘要】 青海油田涩北气田所产气体为干气,井下多有积水,由于水的密度和粘度较干气(井下密度为0.07～0.14g/cm~3)均要高得多,而积水对涡轮流量计的响应较强。从而流量计所测得的资料是井筒积水及产层产出气体两方面信息的综合反映。因此,对于这类井底积液产气剖面资料,如何确定它的流体相态、流型及解释参数,建立符合井下流动状态的积液解释模型,是目前最重要、最棘手的问题。本文针对井筒积水对生产测井资料的影响及相应的解释问题,以青海涩北气田为研究对象,以建立一套积水柱校正及解释模型为研究目的,对井底积液产气剖面进行了系统研究。论文主要分为三个部分:第一部分主要是介绍产液剖面测井的理论基础,包括论文第三、四、五、六章。论文从储层流体高压物理性质着手,从测井学的基本理论出发,介绍了气液两相流动的流动形态,分析了气液两相流动的流型,对两相流动的基本参数作了一定的阐述,同时对研究过程中将要用到的测井解释模型及流型识别方法进行介绍,奠定整个研究工作的理论基础。第二部分结合涩北气田实际资料,开展无积液影响产气剖面解释方法研究,主要是对天然气偏差系数及地层体积系数这两个物性参数的计算。目的是为井底积液产气剖面解释模型的建立提供理论依据,即论文第七章。第三部分针对涩北气田井底积液产气剖面解释方法进行研究,论文第八章。根据涩北气田的实际情况,以产气剖面测井资料和生产动态资料为主,深入研究了井底积液对产气剖面测井资料的影响以及现行解释模型的局限性;结合数理统计分析方法,提出了“油管优先”和“烃类优先”解释原则,建立了适合涩北气田的井底积液解释模型,并把该模型应用于多井资料解释中,解释结果与实际产量吻合。本文提出一套基于数学物理方法的且适用于井底积液产气剖面测井资料解释的积水柱解释模型。该模型是严格建立在体积模型和现场生产实践的基础上的,具有很好的应用价值。同时,模型中引入了气体压缩系数C_g对井筒中轻质相密度进行压力和温度校正,使得该解释模型更好地消除了积水对产气剖面测井资料的影响。具有很好的推广意义。更多还原

【Abstract】 The Sebei gas-field of Qinghai oil-field produces the dry-gas, however, under the well of the Sebei gas-field has much liquid loading. In virtue of the density and viscidity of water has much high compare to the dry-gas which is the density under the well is from 0.07g/cm~3 to 0.14g/cm~3,but the liquid loading response to the turbine flowmeter strongly. Accordingly the data surveyed by the flowmeter is comprehensive reflection of wellbore liquid loading and the gas flowing from producing gas layer. Therefore, For these information of liquid loading on the bottom of well producing gas section,it is the most important and the most tough problem currently that how to determine its fluid phase, the flowing pattern and the interpretation parameter,and establish the interpretation model accord with flowing status on the bottom of well.The paper is about the wellbore liquid loading effect to the measured well data and their explanation. The studying object of the text is the Sebei gas-field of Qinghai oil-field. The studying propose of the text is establish a set of liquid loading column emendation or interpret model. And the text also systemically study producing gas section of the liquid loading on the bottom of the well. The text is fall into three parts. In the first part the text discuss the theory basic knowledge about producing section of measured well, including the third、the fourth the fifth、and the sixth chapter in the text. The text discuss the two kinds of flowage form that is the gas and liquid, and analysis flowing pattern of the gas and liquid ,and expound the basic parameter about the two kinds of phase flowing. The text is begins to the high pressure physical property of the storage layer liquid, and it is set out to the basic measured well study theory. Meanwhile the text also introduces the interpretation model of measure well and flowing pattern identifying method which is used to the studying process, which is the basic theory in the whole studying work. The second part of the text we study interpretation method about no liquid loading on the bottom of well effect on the producing gas section combine with the practical data in the Sebei gas-field, including two parameter calculator: natural gas warp modulus and stratum volume modulus. The chapter seven of the text offer to the theory evidence about the liquid loading on the bottom of the well producing gas section interpretation model built. The third part we study the section interpretation method about the liquid loading on the bottom of well producing gas in Sebei gas-filed. According to the practical condition of Sebei gas-filed, combine with producing gas section measured well data and producing dynamic data, we study the liquid loading on the bottom of well effect on the producing gas section measured well data and the limit of actual interpretation model. We put forward the interpretation principle about the oil tube preference and hydrocarbon preference combine with mathematics and physics statistic analysis method. We established interpretative model of liquid loading on the bottom of well suit to Sebei gas-field. The model is used to many well data interpretation. The results of interpretation accord with practical producing.The paper put forward to a set of liquid loading column interpretation model, which is base on mathematics and physics method, which is suit to the liquid loading on the bottom of well producing gas section measured well data interpretation. The model is base on the volume model and locale producing practice. And the model is good appliance value. Meanwhile, the modelintroduces the gas compressibility coefficient C_g which is emendation of pressure andtemperature about density of light phase in wllbore. So the interpretation model eliminates the liquid loading effect to producing gas section measured well data. The interpretation model is value to spreading.更多还原