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QFLOW-稠油热采开发分析设计软件
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     更新时间: 2020-6-30 开 发 商:雅丹科技
     下载次数:0次 软件语言:简体中文
     应用平台:2003/XP/Win2000/NT/Win9x
     软件类别:稠油生产工程分析设计软件包HeavyPAD
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QFLOW-稠油热采开发分析设计软件

    QFLOW是一款用于稠油井热采的模拟计算软件,可以完成自喷、气举、电泵举升的模拟,特别是对于超稠油井蒸汽辅助重力采油(SAGD)的模拟及工艺参数的设计分析,对稠油油藏的开发具有重要指导意义。

QFLOW的主要功能如下:

1、模拟井的生产、注入及循环过程;

2、自定义井深结构及管柱组成图:直井、斜井、水平井;自定义添加油管、套管及SAGD的管柱结构;

3、可以模拟不同的流体:稠油(沥青)、水/蒸汽、油井伴生气(甲烷)及流体的混合物;也可以预测稠油的乳化粘度;

4、热传导计算:自定义各管柱、环空流体、地层的热传导系数,特别是地层中的热损失,可以选择不同的计算方法:解析解或有限元;

5、多相流参数计算:特别是可以定义压降系数调整压降计算与现场的符合率;

5、井自喷生产参数计算;

6、主蒸汽过程热力参数计算;

7、蒸汽辅助重力泄油(SAGD)的模拟及工艺参数计算;

8、气举模拟

9、电泵井举升参数计算;

10、参数敏感性分析。

QFLOW - THERMAL WELLBORE SIMULATOR

INTENDED APPLICATIONS:

- Steam Injection

- Thermal Production

- Circulating Systems, Injection and Production

- Thermal Gas Lift Design

- Insulated Tubing Evaluation

GRID DESCRIPTION:

- The total length of the well is user specified

- Number of grid blocks = 100

- Grid block length is uniform

- The angle of each element can be specified (90 to -90 degrees, 0 = horizontal, 90 = downward, -90 = upward)

BASIC WELL CONFIGURATION OPTIONS:

Single Flow Configuration

- Single Tubing, Injection or Production

- Annulus, Injection or Production

Dual Flow Configuration

- Tubing, Injection or Production

- Annulus, Injection or Production

- Optional second tubing is available in upper part of the well, flow from annulus is directed into the second tubing string

Three Flowing Stream Configuration

- Concentric flow in a tubing and 2 casing annuli is allowed for. (Currently only valid for water/steam flow with the flow entering the outside annulus from the end of the inner annulus).

Optional Non-Flowing Tubing Strings

To allow for the effect of instrumentation strings on the flow behavior of the system, there is an option to specify the OD of 2 non-flowing strings, one each in the annulus and tubing.

End Main Tubing Before Toe of Well

- Can end the main tubing part way along the well

MULTI-STEP OPTION:

The model can be run in a mode where a series of datafiles are linked to enable detailed calculation of complicated sequences of well conditions. The model will output a grid of the formation temperature at the end of each step. This option can be used principally for the investigation of formation/casing temperatures during cyclic steam simulation (CSS).

UNITS:

The user can select English or Metric for input and/or output

TUBING/CASING DIMENSIONS:

The user specifies the ID and OD of both the tubing, casing and extra (outside) casing, Each grid element can have a different value, Grouping of identical element is allowed for, i.e. 100 * 3.5 gives 100 elements with a value of 3.5. The main tubing can stop short of the end of the well.

CEMENT DESCRIPTION:

Thermal conductivity and thickness is specified by the user for each grid element

WELL PUMPING OPTION:

A pump can be installed in the main tubing string and/or the optional second tubing string in the annulus.

TUBING INSULATION:

Both the thickness and k value can be specified for each element. Grouping of identical elements is allowed for as described under Tubing/Casing Dimensions. Insulation on both the main tubing and the second tubing can be specified.

ANNULUS FLUID TYPE

The type of fluid in the annulus in non-flowing conditions can be user selected from methane/water/steam for each grid element..

HEAT LOSS TO THE FORMATION:

Primary option is based on conduction heating, the time since start-up is user specified. Heat loss to the formation can be toggled on/off for each element in the well. The type of algorithm can be selected, analytical for rapid computation or finite element if a temperature profile into the formation is required.

FORMATION PROPERTIES:

Thermal conductivity and diffusivity are defaulted, user specification is a built in option. Formation temperature is specified by the user and can be adjusted for each element.

TUBULAR THERMAL CONDUCTIVITY:

Default values are used, user specification is a built in option

TUBULAR HEAT TRANSFER FOULING FACTOR:

User has the option of specifying a fouling factor

TWO PHASE PRESSURE DROP CALCULATIONS:

The Beggs and Brill two phase pressure drop correlation is used. The flow type of each element is output

PRESSURE DROP FACTOR

There is an option to adjust the pressure drop by a user specified factor.

PORTS FROM THE MAIN TUBING TO THE ANNULUS:

The model has the capability to calculate the performance of injection systems where ports are installed in the main tubing, directing flow into the annulus.

FLUID COMPOSITIONS:

Each flowing stream can consist of water/steam, bitumen and methane with the following provisions.

The model is capable of handling mixtures of oil/bitumen + water/steam + methane, including situations with superheated steam.

The GOR of the oil is user definable or the internal default value can be used. The specification of the oil gravity is currently limited to the range of 4 - 25 API. The viscosity of the oil is user definable or the internal defaults can be accepted.

The program contains a simplified emulsion model for viscosity prediction, more advanced methods of predicting emulsion viscosity will be implemented as required. More advanced techniques for predicting the thermal conductivity and interfacial tension of oil/water/steam/gas mixtures are being implemented, as required.

Gas injection can be specified part way along the main tubing string or the annulus stream if used.

The program also has the capability to model systems with propane/steam injection. Plans are to expand this feature to a full solvent capability in the near future.

SPECIFICATION OF FLUID PRESSURE/TEMPERATURE/QUALITIES (P/T/Q):

For each stream the user can specify one of the following:

a. Pressure and steam quality

b. Pressure and steam-subcool temperature (not currently active for water/steam/gas mixtures)

c. Pressure and superheat

Different conditions can be selected for tubing and annulus in dual flow configurations.

These conditions are specified at the toe of the well.

DUAL FLOW CONFIGURATIONS - LOCATION OF P/T/Q SPECIFICATION:

The model defaults to specifying the P/T/Q values for both streams at the same end of the well. There is an option to specify P/T/Q at opposite ends of the well at the expense of additional iteration cycles

VARIABLE ANNULUS FLOW – RESERVOIR INFLOW/OUTFLOW OPTION:

The user can specify a variety of inflow/outflow profiles from the annulus flow stream The steam/water flow from the extra annulus can also be specified. It is possible to have a configuration where fluids are injected into both ends of the annulus and meet at a null point.

ELIFT OPTION:

    The user can specify a well with an ELift configuration.

SOLUTION ALGORITHM OPTIONS:

- For Single Flow Configurations only a single pass through the grid is required, there are no options.

- For a Dual Flow Configuration there are two options:

a. Standard, usually requires 35-50 iterations, works well for most situations

b. Advanced, requires 100 iterations, will solve highly non-linear problems.

- In the multi-step option it is possible to run the model in a conduction only mode to simulate operations with no fluid flow.

PRINTING:

The user can select various printing formats to paper or computer file.

GRAPHICAL USER INTERFACE:

The program has a convenient Windows interface with built-in automatic graphs of important output parameters.



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