The distribution of remaining oil is often described qualitatively. The remaining oil distributed in the whole reservoir is calculated according to the characteristics of the space distribution of the saturation of re...The distribution of remaining oil is often described qualitatively. The remaining oil distributed in the whole reservoir is calculated according to the characteristics of the space distribution of the saturation of remaining oil. Logging data are required to accomplish this. However, many such projects cannot be completed. Since the old study of remaining oil distribution could not be quantified efficiently, the ＂dynamic two-step method＂ is presented. Firstly, the water cut of every flow unit in one well at one time is calculated according to the comprehensive water cut of a single well at one time. Secondly, the remaining oil saturation of the flow unit of the well at one time is calculated based on the water cut of the flow unit at a given time. The results show that ＂dynamic two-step method＂ has characteristics of simplicity and convenience, and is especially suitable for the study of remaining oil distribution at high water-cut stage. The distribution of remaining oil presented banding and potato form, remaining oil was relatively concentrated in faultage neighborhood and imperfect well netting position, and the net thickness of the place was great. This proposal can provide an effective way to forecast remaining oil distribution and enhance oil recovery, especially applied at the high water-cut stage.展开更多
Gerotor pump is a special kind of internal rotary pump, which contains a trochoid profile (commonly called as cycloid). Generation of trochoid is normally realized by external rolling method, namely a circle rotating ...Gerotor pump is a special kind of internal rotary pump, which contains a trochoid profile (commonly called as cycloid). Generation of trochoid is normally realized by external rolling method, namely a circle rotating on a fixed circle without slipping. This paper proposes derivative process of the trochoid profile by means of internal rolling method, which is that internal surface of a circle contacts with a fixed circle and rotates around it without slipping. Moreover the instantaneous flow rate can be obtained by numerically calculating the change ratio of area between the inner and outer rotors in the outlet region of the gerotor pump, which avoids to complicatedly derivative process.展开更多
为探究环下润滑供油通道滑油流量分配特性,采用volume of fluid(VOF)方法对轴心射流收油环内部两相流动进行了计算,获得了供油通道内油膜形成过程与流场特征,重点讨论了供油温度、主轴转速、供油流量及供油孔径组合对流量分配的影响规律...为探究环下润滑供油通道滑油流量分配特性,采用volume of fluid(VOF)方法对轴心射流收油环内部两相流动进行了计算,获得了供油通道内油膜形成过程与流场特征,重点讨论了供油温度、主轴转速、供油流量及供油孔径组合对流量分配的影响规律,建立了临界孔径比的无量纲关联式。结果表明:滑油射流冲击收油环中心后形成油膜,其边缘断裂形成油带、油矢甩至侧壁面,最终油膜铺满整个端面;计算工况范围内,滑油分配主要受供油流量及孔径影响,各出口流量随供油流量上升均呈线性增加,滑油分配比随供油流量增加而平均降低15.05%;滑油分配比随下游孔径与孔径比的增加而上升;当无量纲供油流量越大且下游无量纲孔径越小时,临界孔径比越高并趋近于1,当无量纲供油流量降低或下游无量纲孔径增大时,临界孔径比则下降。展开更多
文摘The distribution of remaining oil is often described qualitatively. The remaining oil distributed in the whole reservoir is calculated according to the characteristics of the space distribution of the saturation of remaining oil. Logging data are required to accomplish this. However, many such projects cannot be completed. Since the old study of remaining oil distribution could not be quantified efficiently, the ＂dynamic two-step method＂ is presented. Firstly, the water cut of every flow unit in one well at one time is calculated according to the comprehensive water cut of a single well at one time. Secondly, the remaining oil saturation of the flow unit of the well at one time is calculated based on the water cut of the flow unit at a given time. The results show that ＂dynamic two-step method＂ has characteristics of simplicity and convenience, and is especially suitable for the study of remaining oil distribution at high water-cut stage. The distribution of remaining oil presented banding and potato form, remaining oil was relatively concentrated in faultage neighborhood and imperfect well netting position, and the net thickness of the place was great. This proposal can provide an effective way to forecast remaining oil distribution and enhance oil recovery, especially applied at the high water-cut stage.
文摘Gerotor pump is a special kind of internal rotary pump, which contains a trochoid profile (commonly called as cycloid). Generation of trochoid is normally realized by external rolling method, namely a circle rotating on a fixed circle without slipping. This paper proposes derivative process of the trochoid profile by means of internal rolling method, which is that internal surface of a circle contacts with a fixed circle and rotates around it without slipping. Moreover the instantaneous flow rate can be obtained by numerically calculating the change ratio of area between the inner and outer rotors in the outlet region of the gerotor pump, which avoids to complicatedly derivative process.
文摘为探究环下润滑供油通道滑油流量分配特性,采用volume of fluid(VOF)方法对轴心射流收油环内部两相流动进行了计算,获得了供油通道内油膜形成过程与流场特征,重点讨论了供油温度、主轴转速、供油流量及供油孔径组合对流量分配的影响规律,建立了临界孔径比的无量纲关联式。结果表明:滑油射流冲击收油环中心后形成油膜,其边缘断裂形成油带、油矢甩至侧壁面,最终油膜铺满整个端面;计算工况范围内,滑油分配主要受供油流量及孔径影响,各出口流量随供油流量上升均呈线性增加,滑油分配比随供油流量增加而平均降低15.05%;滑油分配比随下游孔径与孔径比的增加而上升;当无量纲供油流量越大且下游无量纲孔径越小时,临界孔径比越高并趋近于1,当无量纲供油流量降低或下游无量纲孔径增大时,临界孔径比则下降。
