Using the WellPlan software:



WELLPLAN: STUDENT GUIDE

Contents:

0 - Introduction……………………………... 02

I - Starting Well Plan………………………. 03

II - Creating a New Well……………………. 04

III - Entering the basic Information………….. 06

IV - Hydraulics……….……………………… 14

V - Well Control Analysis…………………… 20

VI - Surge Analysis…………………………… 25

VII - Torque and Drag………………………… 09

VIII- Exercises…………………………………. 28

Written by:

IAESTE Student Fernando Spinelli fer.spinelli@

0 - Introduction

This software is used to simulate drilling operation. It can either be used to plan/analyze the prosess of building a new site or to evaluate possible alternatives in actual problem. The user is required to input the data and the software has a range of modules to assess the data. There are 8 main modules that can be chosen to generate the simulations and different outputs. For every module you may have a range of submodes to run the analysis. The modules are:

• Torque Drag Analysis: predicts and analyzes the torque and axial forces generated by drill strings, casing strings, or liners while running it in pulling out, sliding, back reaming and/or rotating in the well bore. The main outputs of this module are the Effective Tension, True Tension, Torque, Fatigue, Stress and Side Force graphics.

• Hydraulics: used to simulate the dynamic pressure losses in the rig’s circulating system, and to provide analytical tools to optimize it. The main outputs of this mode are the Geothermal Gradient and Pressure Loss graphics.

• Well Control: calculates the expected influx volume, generates kill sheets, determines maximum safe drilling depth, and determines the maximum allowable influx volume. The main outputs of this mode are Pressure at Depth, Maximum Pressure, Allowable Kick Volume, Safe Drilling and Full Evacuation to Gas graphics.

• Surge: used for finding surge and swab pressures throughout the well bore cause by pipe movement. The main outputs are Surge Limit, Swab Limit and Trip Speed vs. Moving Pipe Depth graphics.

• OptCem: used to optimize cementing operations and minimize the possibility of costly errors. The main outputs are the Circulation Pressure and Surface Pressure graphics.

• Critical Speed: assists with the determination and prediction of critical rotation speeds that may result in damaging downhole vibrations. The main outputs are the Critical Rotational Speeds, Applicable Forces and Moments graphics.

• Bottom Hole Assembly: this module provides an accurate representation of the forces acting on the assembly as it lies in the well bore. The main outputs are the Side Force and Displacement graphics.

• Stuck Pipe: calculates forces acting on the drillstring at the stuck point. It can be used to determine the location of the stuck point, the overpull possible without yielding the pipe, the measured weight required to set the jars and the surface action required to achieve the desired conditions at the backoff point.

To run any module there are some basic data that must be entered and each one has its own requirements to run the analysis. The first step to start the simulation is to input the basic information. In order to do that there are 2 options: whether you use a previous file which has similar characteristics to the new one or you start one from the scratch. Sometimes it may seem easier to use a previous file, but eventually there are some differences that may be forgotten which could spoil the analysis. Since the time spent on inputting the basic information is relatively short, it is recommended to start a new well design if you are going to simulate a well that has never been used before.

This is a quick guide and will give emphasis in 4 modules: Torque Drag Analysis, Hydraulics, Well Control and Surge. It will teach you how to input the data to run the software, but it does not have detailed explanation about how the software performs its analysis. For detailed descriptions of the different modules, there is a WellPlan manual available. There is one hardcopy of the manual with Olve Rasmussen (olvesund@stud.ntnu.no) and the company offer online help at eame_helpdesk@ . Every time you need their help, you should also send the license and version information:

Site number: 15409

Name/location: Norwegian U. of Science and Tech.

Dept. of Petroleum Engineering and Applied Geophysics

 

The Version is: WELLPLAN 2003.11.0.1 (EDM 2003.11.0.3(04.16.00.025).00)  

I – Starting WellPlan

The software WellPlan is only installed in one machine at IPT. It can be found in the computer lab “Sykkelverkstedet” on the basement of the institute (middle one of the three phsing north). Every time you star the software, you have to input the following information:

DataSourse: EDT 2003 single user

User: edm

Password: landmark

Everytime you log on to the computer as the same user, the well that you were working on last time will be available when you start the software. You can work on the well, edit it and save it. However, if you were working in a file and you want to edit it later as a different computer user (or if somebody else will work on that file later), you have to export the information when you are finished, so the next user can import it and continue working on the same file. The same thing will happen if the software is eventually installed in a different computer. To use the same file on a different computer, you have to export is from the original computer and import it to the new one.

There is a sample file available (created by me) that can be found in the location C:\Landmark\Samples of the computer where the software is installed. You just open the software and import the case (from File menu).

II - Creating a New Well

There are different levels to describe a well. The first level is the Company. When you are creating a new well you should say if it belongs to an existing company otherwise you will have to create a new company. Right click on Company and follow the dialog. The same will happen with all the different levels available, which are Project, Site, Well, Wellbore, Design and Case. In some levels, there is some information that must be entered while you are creating a new file. Below you can check the levels on which some type of data that must be entered while creating the file:

• Well: when creating a new file at this level you must enter the information about depth reference.

You should define if the well is onshore, offshore or subset. Depending on the situation you may have to create a datum to place the RKB. As you can see from the figure, if the well is offshore, you have to enter the water depth and the wellhead elevation;

• Design: at this stage you must enter the phase at which the well currently is. You can choose between Prototype and Planned.

In the above figure you can see that you also have to choose the Depth Reference Information (if more than one datum has been created at the Well level).

III - Entering the Basic Information

The basic information must be entered at the design and case levels. This data will be used by the software to simulate all the situations purposed at the different modules. It is extremely important that these information is as faithful as possible to actual situation, since small changes at this level can be propagated into considerable changes in the outputs.

3.1 - Design Information

When the design level is selected in the Well Explorer (the window on the left of the screen, where all the information about the well is shown), 4 options become available on the bottom left corner. The illustration bellow show the expected layout when you are inputting the basic information of the design.

As you can see above, there are 4 different types of basic information that must be entered at the design level, to edit one of them just double-click it:

• Wellpath: this is the data about the geometry of the well, if you are not using the data from an actual station, you should enter the expected measured depth (MD), inclination and azimuth at different depths and software calculates the True Vertical Depth, as well as other characteristics of the geometry.

• Pore Pressure: here you enter the information about the Pore Pressure at different depths;

• Fracture Gradient: here you enter the information about the Fracture Gradient at different depths;

• Geothermal Gradient: by clicking here a window will open and you will have to enter the surface, mudline and well temperatures. If you want, you can just enter the temperatures at different depths. It is important to know that the temperature here is the formation temperature.

3.2 – Case Information

When the case level is selected in the Well Explorer, 3 options become available on the bottom left corner. The procedure to edit them is the same as the design level. The options here are:

• Hole Section: here you describe the well geometry. You can choose between casing, open hole, riser or tubing and enter the depths at which they take place. When you choose a casing, for example, you have to enter the nominal weight, nominal diameter and grade. After you have input the data, you still can edit the characteristics, such as inner diameter, friction factor, linear capacity… It is important to enter the information as precisely as possible because the hole section characteristics will be used to calculate outputs from the different modules.

• Assembly: Here you input the information about the drill string.

As you can see, for every component of the string you should choose its properties. WellPlan has a catalogue of possible components and you can choose from a range of options. Sometimes the one you are looking for is not in the catalogue, and then you can choose the closest one and edit the properties that differ from the one in the catalogue. For every component you should also enter the length, and since you have the total length (that you must input), the software calculates the length of required drill pipe from the RKB to the bottom hole assembly.

• Fluid: Here you should enter the fluid data. You can add more than one fluid and choose which one is circulating at different situations.

There are some properties that must be entered. On the top right, you must enter fluid density, type, base and choose the rheology model used. You should also input the flow line temperature, plastic viscosity and yield point.

Once you have entered the design and case information you are ready to choose from one of the modules for your analysis. In the next pages you will get instructions on how to operate the different modules. Just remember that the basic information has a great impact on the graphics output and if the outcome plot differs from the expected plot there is probably something wrong in the basic information. Sometimes it is necessary to look for the error by inspection, editing the information to check for the impact of the change in the plot.

IV – HYDRAULICS

Besides the basic information, there are other tables that must be filled so the software can run the hydraulics analysis. Below you can see the table with the different modes on the first column and each “X” says the required tables to run the mode. You can edit some tables by clicking “Case” on the menu bar. Some other tables can be edited by clicking on “Parameters” on the menu bar. At this module you can choose between 12 modes:

• Pressure: Pump Rate Range;

• Pressure: Pump Rate Fixed;

• Annular Velocity Analysis;

• Swab/Surge Tripping Schedule;

• Swab/Surge Pressure and END;

• Graphical Analysis;

• Optimization Planning;

• Optimization Well Site;

• Weight up;

• Hole Cleaning Operational;

• Hole Cleaning Parametric;

|  | | | ECD | | | |

| |Eccen|Circu|Depth|Rates|Stand|Opera|

| |trici|latin|s | |off |tions|

| |ty |g | | |Devic|Data |

| | |Syste| | |es | |

| | |m | | | | |

|Expected |X* |X |

|Influx Volume | | |

|223,2 |12,3 |100 |

|365 |12,3 |100 |

|1164,5 |68,4 |110,6 |

|1585 |68,4 |110,6 |

|1964 |67,84 |110 |

|2343 |69,1 |113,1 |

|2680 |66,67 |113,1 |

|3017 |66,9 |113,8 |

Basic Information: Case

Hole Section:

Fluid:

|Density |1720 |kg/m3 |

|BaseType |Water |  |

|Rheology Model |Bingham Plastic |

|Temperature |60 |ºC |

|Plastic Viscosity |38 |µPa*s |

|Yield Point |17 |Pa |

Bottom Hole Assembly (not to scale):

Exercise 1:

While drilling the well described above, a kick occurred. Considering that there was no mud circulating at the moment of the kick, the kick Interval gradient was 16, 2 kPa/m and assuming the temperature is defined by the Geothermal Gradient, answer the items bellow:

a) What kind of kick was it?

b) Plot the Maximum Annulus Pressure;

c) Plot the Annulus Pressure at the bottom as Function of Influx Volume;

d) Plot the Formation Breakdown Gradient in the Open Hole;

Exercise 2:

Considering the Pump Flow Rate as 3, 65 m3/min, the Weight on Bit as 147, 1 kN, the Torque at Bit as 33000 N.m, the tripping speed (non rotating) as 18,29 m/min, and the Travelling Assembly Weight as 98,4 kN, answer the items below:

a) Plot the Torque Drag Effective Tension Graph;

b) Plot the Torque Drag True Tension Graph;

c) Plot the Torque Drag Fatigue Graph;

d) Plot the Normal Torque Graph;

Exercise 3:

Consider the Minimum Pump Flow Rate as 2, 3 m3/min, the Increment Pump Rate as 0,15 m3/min and the Maximum Pump Rate as 3,65 m3/min, the Maximum Pump Pressure as 30000kPa and the Maximum Pump Power as 18250 kW. The ECD depths should be every 1000 m and at the bottom of the well and the Surface Equipment Rated Working pressure should be set at 32000 kPa. Using the Hydraulics module and the Pump Rate Range mode, answer the items below:

a) Plot the Pressure Loss Graph;

b) According to the graph, what would happen if the Flow rate was set 2, 3 m3/min?

c) According to the graph, what would happen if the Flow rate was set 3, 65 m3/min?

d) Plot the Geothermal Gradient Graph;

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WELL EXPLORER

DESIGN INFORMATION

MODE SELECTION

340.49 mm

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