User Manual of SURVEY - drill-byte

SURVEY - User Manual

User Manual of SURVEY

User Manual of SURVEY ................................................................................................... 1Foreword ............................................................................................................................ 1Naming convention ............................................................................................................ 1Menus ................................................................................................................................ 2

[Open] ........................................................................................................................ 2[Open].[Well] .............................................................................................................. 2[Open].[Branch] .......................................................................................................... 2[Open].[Well Header] .................................................................................................. 2[New Branch] ............................................................................................................. 5[Save] ......................................................................................................................... 5[Save as new] .............................................................................................................. 6[Save as new].[Branch] ............................................................................................... 6[Save as new].[Well] ................................................................................................... 6[Clear] ........................................................................................................................ 7[Clear].[Branch] .......................................................................................................... 7[Clear].[Well] .............................................................................................................. 7[Clear].[Workbook] ..................................................................................................... 7[Draw Wells]............................................................................................................... 7[Anti-collision] ........................................................................................................... 8[Geodesy] ................................................................................................................... 9[Interpolate] .............................................................................................................. 10[New RTE] ................................................................................................................ 11

Sheets ............................................................................................................................... 13Design sheet ............................................................................................................. 13Survey Table sheet .................................................................................................... 14Graphs sheet ............................................................................................................. 15Drawings sheet ......................................................................................................... 16Anti-collision sheet ................................................................................................... 18ISCWSA anti-collision models .................................................................................. 19Trajectory sheet ........................................................................................................ 21License sheet ............................................................................................................ 21


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Foreword

The booklet applies to the current version of the SURVEY spreadsheet (6.78).

It assumes the user is familiar with Directional Drilling terms, with using Excel and usingsimilar D.D. Software.The program was tested on Windows XP with SP3, 32 bits with Office 2007 and Windows 8,64 bits, with Office 2013, English versions.

Naming convention

Actual type (or Actual deviation) is composed of contiguous deviation points and it isstored as is. Despite the Actual deviation it is shown in the branches list at all times, it maynot be loaded into the “Design” sheet, but only into the “Trajectory” sheet. It may be loadedas separate branch, or altogether with the parent branch to surface. This last option it is veryhandy when the user wants to create a new file with joined wellpaths as a single hole.Buttons and menu items are marked by square brackets “[ ]”. The subsequent menu itemsare separated by dot. For example [Open].[Well] means “pick the menu item [Open] andthen select the [Well] sub-menu item”.Branch is a section of the hole. It may start from surface (wellhead) or it may start deeper, aschild of a parent branch.

Design type (or Design deviation, or Plan deviation) is composed of wellpath constrainpoints (maximum 20 points allowed by this program). The trajectory described by thesepoints it is calculated every time an operation is done with the respective set of data. TheDesign deviation may be loaded in either of the two working sheets, “Design” and“Trajectory”.The designed trajectory calculated with the step the user filled into the <Well Header> form,and it is displayed in full on the sheet “Survey Table”.Displayed or loaded branch (or data), mean the branch that is shown on the computerdisplay.

Existing branch (or data), means a branch that was already saved in a well file, on disk.

Offset wells are the wells selected by the user to run anti-collision calculation against.Parent branch is a relative shallower position of a directly connected hole section in regardsto a deeper hole section, called child branch. It means the first (shallowest) deviation pointof the child it is located on the trajectory of the parent. The section of the hole that is directlyconnected to the wellhead, it is also called main hole, it has no parent branch and its startingdeviation point is MD = 0, Inclination = 0, Azimuth = 0.

Program forms and fields are marked with angle brackets “< >”, like <Well Header>.

Reference well is the well selected as central well, for the anti-collision calculation.

Well file or case file it is a physical file on disk, having a name given by the user (usuallythe name of the well) and the extension “.cas”.


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Menus

[Open]

menu would allow the user to load data stored on well file, on disk, into the spreadsheet.Also it allows to edit the <Well Header> data, once loaded.

[Open].[Well]menu item is used to load the well data, from a “.cas” file, into memory. Really it has notmuch importance as the data common to all branches is loaded anyway when a branch of thewell is loaded. However there are some cases when loading the well data only may be useful.

[Open].[Branch]is the main input operation. By picking this menu item, the user will be allowed to browsethe disk for the desired well file (having the extension “.cas”, being actually an unlocked MSAccess database), and select the name of the branch he wants to load.If the user is on the “Design” page, he would be allowed to chose only “Design” typebranches, while if he is on “Trajectory”, he would be able to load both “Design” and“Actual” well trajectories. Moreover, in this case he can load an entire wellpath, even ifcomposed of several branches from bottom to surface, by checking the <Load well fromsurface> box.

Once the branch was loaded, it is displayed and ready to be used. Some of the specificfeatures of the branch may be filled in the <Well Header> form.

[Open].[Well Header]menu item would allow the user to fill in the required specific data of the loaded branch andthe shared data of all the branches of a well.


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If the <Well Header> form is opened in the <Design> sheet, the type of the well will beautomatically set as “Plan”. It will be set on “Actual” if the form will be opened in the“Trajectory” sheet.

<Step> is the interval used to build/interpolate the designed deviation. Usually it is 100 ft or30 m. However it may be customized.The user has also to fill the <VS azimuth> field, which is specific for each branch. Of course,when representing multiple branches in Vertical Section, only one VS azimuth will be used.Some features of the <Well Header> will be locked once they are filled and saved. The mainconcern are the Elevations as these may change over time, either due to (more often) a newactivity done in the well (reentry) or even due to subsidence. However the user is allowed tomodify the RTE by the appropriate menu item [New RTE].[New RTE] will also modify the measured depths of the surveys relative to the new RotaryTable Elevation.

Tip: In order to use this feature on a well, the well file must not be open.

Tip: For the current version, the <Conductor Pipe> frame is not implemented.

Click on the near by Combo box and select the parent branch.

Note: The name of the current branch will be missing from the Combo box list, as thecurrent branch cannot be tied to itself.

Then, in the <MD> field, fill in the Measured Depth at which the current branch is connectedto the parent branch. The program will automatically interpolate the other parameters of thepoint, including its UTM coordinates.If the new branch is tied to another branch, check the <Tied on> box. This will expand theoriginal window as follows:


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If the users has selected an already tied branch and the tie on point is above the parent branchpicked up by the user, the program will automatically display the actual parent branch in the<Actual branch tie on> field, like in the following image:


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Once the editing of the <Well Header> is completed, the user can either press [Cancel] toabandon the changes, or to press [Apply] to store the new data in the spreadsheet. If the userwants to preserve the data, he has to save it in the .cas file, by picking the [Save] menu item.

Tip: The [Delete] button here is the only safe method to delete an existing branch from awell file (.cas file on disk). However the deletion is only allowed if the branch to bedeleted is not a parent branch, having another branch connected to it, below its own tieon point (a child branch). If it is a parent branch, it cannot be deleted until the childbranches are not deleted.

The program should take care updating the data after an I/O operation but,because it may fail to do it (due to either of a programming error, or because of theintrinsic nature of the VBA- MS Office environment), it is a good practice for theuser to clear the workbook by the appropriate menu item, [Clear].[Workbook], andreload the well or the branch as needed.

[New Branch]menu item is the advised way to add a new branch to an existing, loaded, well.

If the deviation table is not empty (either because the user loaded another branch or the userhas input data forgetting to let the program know it is a new branch), dialog box will ask if todelete or to preserve the existing data.

Regardless the user has chosen to keep the data, the <Well Header> form opens and the usermay input the minimal, compulsory data .

Press [APPLY] button to apply the changes to the table (not in the file on disk though!).

To save the new branch on the disk, pick the [Save] item of the menu, as the program isalready aware this is a new branch. At this point, the [Save as new].[Branch] menu itemwould not work unless you chose to rename the branch.

Note: the data shown in the <Tie on point> frame, will be written on the spreadsheet asthe first line of the deviation table.

[Save]menu item will simply save the current loaded data of the branch (including its well header)over its corresponding id.

In order to allow the user to rename a well branch, the branches are identified internally byan unique number, called branch id. Therefore, even if the user changes the name of abranch, if then presses [Save], the current branch loaded in the spreadsheet will beoverwritten in its own “.cas” file. If the user plans to save it as a new branch, in the samewell (.cas), he has to use the [Save as new].[Branch] menu item.

Note: Once a branch got another branch tied to it, the parent branch cannot bemodified anymore! The user can trick the restriction by opening the child branch,tie it to another branch (temporary) till he modifies (and saves) its parent, and thenopen the former child branch and tie it again to its parent, as before. The reason orthis restriction is to avoid getting “floating” branches, connected to nothing.


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Tip: If you want to copy a branch from a well to another well, load the respectivebranch, then load the destination well, and after pressing [Yes] when asked if you wantto keep the displayed branch, press the [Save] button.Note: Be aware and let the program to convert the new data (if the new well uses adifferent set of measuring units - oilfield system or IS) before saving, to avoidunpredictable results.Also, be aware, in this particular case, the program lets the user to save the newbranch even if this is tied to wellhead and the target well has already a branch of itskind (designed or actual) tied to surface. Therefore use this “branch copy” shortcutcarefully!

[Save as new]menu allows the user to save the displayed branch as a new branch, either in the currentopened well, or in a new well. However there are some checks done by the program beforedoing the saving.

[Save as new].[Branch]will save the displayed branch as a new branch, in the same well file. However it will do firstsome checking to avoid the duplication of the names of the branches when they are sametype (both “design” or both “actual”), or the ranks of the branches.In contrast with the shortcut of above note, this command would not allow saving of twobranches (of the same type, “design” or “actual”) connected to wellhead. Therefore thebranch to be saved will have to be tied to another branch (see the <Well Header> from fordetails).

[Save as new].[Well]will save the displayed branch in a new well file. This is the only method to create a newwell file (.cas file) using the program.

Tip: The external way to create a new well file, is to simply copy and paste an existingwell file, and then modify the data that may be locked in the <Well Header> form byusing the MS Access. However the latter method is not recommended as a smallincongruence of the data would lead to unpredictably behavior of the program.

The new file is created by SQL commands, using the installed MS Access libraries, and istransparent to the user. All the user has to do is to provide a name for the new well file and toselect a folder where the new well file shall be created.The well file encloses tables that are used - along with the deviation of each branch - for theTorque and Drag program too. The way it works is the same way as the tandem Compass -Wellplan of Landmark. There is no new file creation in Torque and Drag program.The creation of the new well file starts with either loading an existing wellpath from a file, orby pressing the [New Branch] menu item, filling in the <Well Header> form, press [Save],fill in the deviation and press [Save as new].[Well]. Input the name of the new well file and,if chose to, select a different folder than the current one.


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The menu is enabled only if there is a branch on the sheet, i.e. a name of the branch and atleast one line of deviation.

The successful creation of the new file is reported by the program.

[Clear]All the [Clear] menu items would only delete the displayed, loaded data. They would notdelete data from the well file on disk.

[Clear].[Branch]Menu item will clear the data associated with the current displayed branch.

[Clear].[Well]Menu item will clear the data associated with the current loaded well. Beside the dataassociated with a certain branch, the program loads the common data of the branches(including the well header) in the background.

[Clear].[Workbook]Menu item will clear the entire workbook: loaded branches or wells in any of the two mainsheets (“Design” and “Trajectory”), as well as the charts.

[Draw Wells]

The menu carries out the drawing of the horizontal and vertical projections of the wellpaths.It is possible to display only one branch or dozens of wells. For the vertical sections, apreferred azimuth may be filled in.


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If there is to be displayed more than one well, the <Use UTM coordinates> box is checkedby default. For a single well, this is up to the user. Hereafter it was displayed one well withthree trajectories: one actual and two designed, one of which being a child branch.By default the program displays the full length of the wells, but for the horizontal projection,the user may select a spider view, with a limited radius - useful for platform slots.

The selected well in the left panel was chosen to be highlighted, pressing [Highlight well=>].

Checking the box <Use Elevation> will force the wells to be aligned to the sea level.

After pressing [Draw], the selected branches will be calculated and the drawings will beplotted on the <Drawings> sheet.

[Anti-collision]

The menu carries out the center-to-center calculation between the segments of the ReferenceWell and the Offset Wells. It opens a form where the user has to select the Reference Well(actually the branch) as central trajectory for the anti-collision calculation.The way it works is as follows: the Reference Well is sectioned in segments of the indicatedlength and each of the selected offset wells (here the designed wellpaths were removed, asbeing not significant at the time of the drilling of the reference well) is segmented in thesame way. Then the distance (in 3D Cartesian space) between the two segments is calculatedon the interval chosen by the user <From> <to>. If the distance becomes bigger than the<Max distance>, it is discarded. However, the calculation goes on for the entire choseninterval, and if the wells get closer to each other and the distance gets smaller than <Maxdistance>, the value it is displayed.

The <Surface hole (csg) size> it is not used by the program, at the moment, therefore it is notcompulsory to fill that field.

Note: Be aware there may be wellpaths that can remain out of the Offset Wells list.The user is the solely responsible for the wells selection and data integrity!


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The buttons are self explanatory. The [Remove plan] will remove all the “Designed”trajectories as they may be not significant at the moment of the drilling of the ReferenceWell.

The two plots are shown in the <Anti-collision> sheet.

[Geodesy]

The menu opens a small form that allows the user to perform coordinates conversions, fromGeographical to UTM, and vice versa, as shown hereafter.

There are about 20 Geodetic Datums stored inside. Select the one you use and press theappropriate button. Fill the input data either on the top fields (for converting fromGeographical), or in the lower fields (for converting from UTM).


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[Interpolate]

The menu opens a small form that allows the user to perform interpolation of the displayeddeviation stations. This means the menu will be enabled when the user is either on <SurveyTable> sheet, or on “Trajectory” sheet. However, despite the menu is enabled when one ofthe two sheets are selected, the form would not load unless there are deviation stations on thesheet. That means the program allows the user to paste existing deviation, instead of loadingit from a .cas file, and still be able to interpolate the deviation.In the following image, the first two deviation stations are at surface and at 50 ft. However,the program can interpolate even if the trajectory displayed is tied to another branchsomewhere deeper. In this case, the user has to provide the TVD, North and East of the firststation point though.

The beauty of this calculation is the interpolation is done using also the Minimum CurvatureMethod, and not a linear interpolation, therefore the result is extremely precise.Moreover, the user can interpolate after any of the fields that are not grayed on this form(MD, Inclination, Azimuth, TVD, North or East).


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If the interpolation is carried out for MD (as shown above), the program will automaticallysearch for the two stations that are straddling the interpolated MD, as the MD can be onlycontinuously increasing. However if the user will chose any of the other above listed fields,the selection of the two survey stations will have to be done by himself, by moving thecursor on the right-side scroll bar (as the variation of the rest of the parameters is notcontinuously increasing (yes, this is true even for the TVD, in horizontal wells, when theinclination may exceed 90 deg).In the next image, the interpolation was done on 17.11 degree inclination (an arbitrary value,in this example):

As sometime the user needs to interpolate several depths, the program should help him tosave the time of copying the data on a sheet of paper. “It should”, as Microsoftimplementation of the data saving in the clipboard fails randomly, without any warning orerror code) in the new versions of Office (sometime it even works!), despite the check box<Copy to Clipboard> is selected by default.The user will be warned if he tries to extrapolate data (to calculate outside the existingdeviation depths).

[New RTE]

This menu opens a small form that allows the user to change the RTE in a well file, on disk.The reasons the user may want to do that are varied: either the planned RTE was not reachedand the actual RTE is either higher or smaller, either the RTE was changed deliberately dueto some technical issues (like CP subsidence, for example), or the old RTE is not feasiblewhen a new rig is moved on location, for an workover or another activity.The modification of the RTE will bring the modification of the existing deviation stations,which are referencing the old position of the Rotary Table. For example if the old RTE was


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30 m and the first deviation was recorded at 100 m, if the new RTE would be 33 m, the olddeviation station would be now located at 103 m. Actually all the Measured Depths wouldshift with the same difference between the old and the new RTE, in this example with 3 m.

As the operation has to be done on disk, the well file has to be closed. If it is not, theprogram will ask the user to close the file, by deleting the well data loaded on spreadsheet.The best solution would be [Clear].[Workbook] to clear all the loaded data.

The user has only to select the well of which RTE he wants to change and, after theprograms reads and shows the current stored RTE, the user will fill in the <New RTE> andpress [APPLY].

The program will report the successful execution of the task.


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Sheets

Design sheet

The sheet allows the user to design a trajectory, using some constraints for the path. Theseconstraints are usually a combination of three parameters listed in the yellow columns with acomputing method selected in the rightmost column, except for the “Hold” method,whichrequires only one parameter.A particular line is the first one, where the exact position of the point has to be described. Inthe hereafter case, the first point it is at the wellhead.Basically the user will input these three parameters of each constrain, one by one, and thenselect the calculation method for each set. If there is no method available, it means thecombination of the parameters is either not supported, or is not uniquely describing a point inthree dimensions.The sheet works similar to most of the tools used on the market for trajectory design,therefore it is not detailed here.

WELL AK6P4 BRANCH AK6P4

NoMD Length Incl Azi TVD North East BUR TR DLS TF

Method[ft] [ft] [deg] [deg] [ft] [ft] [ft] [º/100ft] [º/100ft] [º/100ft] [º]

1 0.00 0.00 0.00 0.00 0.00 0.00 Tie on point2 1900.00 Hold3 2166.67 1.50 300.00 Constant DLS4 200.00 2.00 0.00 Constant DLS5 200.00 Hold6 80.78 300.00 4506.60 Constant DLS7 5000.00 Hold8 9655.80 80.73 272.12 Constant DLS9 5268.57 Hold

10 58.00 270.71 5800.00 Constant DLS11 6452.00 Hold12 6727.00 Hold13 6991.96 Hold

If it is a new branch, pick the [New Branch] menu item and fill in the <Well Header> data.As explained above, at the respective menu section, once the [APPLY] is pressed, the tie onpoint will be written on the first line of the table.Unless you have already a designed plan, it is recommended to input the lines one by one.After filling one more line, press [Calculate] and check the result in the tables from Designand Survey sheets, as well as the drawing on Graphs sheet. If happy, press [Undo] andresume the work with the next line.

Note : Do not forget to save your work from time to time!

Note: When filling in the <Well Header> select the measuring units system, eitherfield units (feet, º/100ft) or IS (meters and º/30m). This option will further impactthe units used for the Torque & Drag software, and it cannot be changed!


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The result should look like this:

WELL AK6P4 BRANCH AK6P4

NoMD Length Incl Azi TVD North East BUR TR DLS TF

Method[ft] [ft] [deg] [deg] [ft] [ft] [ft] [º/100ft] [º/100ft] [º/100ft] [º]

1 0.00 0.00 0.00 0.00 0.00 0.00 Tie on point2 1900.00 1900.00 0.00 0.00 1900.00 0.00 0.00 0.00 0.00 0.00 0.00 Hold3 2166.67 266.67 4.00 300.00 2166.45 4.65 -8.06 1.50 0.00 1.50 300.00 Constant DLS4 2366.67 200.00 8.00 300.00 2365.31 15.10 -26.16 2.00 0.00 2.00 0.00 Constant DLS5 2566.67 200.00 8.00 300.00 2563.36 29.02 -50.27 0.00 0.00 0.00 0.00 Hold6 5477.84 2911.17 80.78 300.00 4506.60 980.17 -1697.71 2.50 0.00 2.50 0.00 Constant DLS7 8557.24 3079.40 80.78 300.00 5000.00 2499.98 -4330.10 0.00 0.00 0.00 0.00 Hold8 9655.80 1098.56 80.73 272.12 5179.96 2796.85 -5361.27 0.00 -2.54 2.50 267.61 Constant DLS9 10205.87 550.07 80.73 272.12 5268.57 2816.93 -5903.78 0.00 0.00 0.00 0.00 Hold

10 11723.71 1517.84 58.00 270.71 5800.00 2853.09 -7314.44 -1.50 -0.09 1.50 183.09 Constant DLS11 12954.09 1230.38 58.00 270.71 6452.00 2866.02 -8357.78 0.00 0.00 0.00 0.00 Hold12 13473.04 518.95 58.00 270.71 6727.00 2871.47 -8797.84 0.00 0.00 0.00 0.00 Hold13 13973.04 500.00 58.00 270.71 6991.96 2876.72 -9221.83 0.00 0.00 0.00 0.00 Hold

Survey Table sheetEvery time the [Calculate] is pressed (on Design sheet) the full wellpath is calculated andshown here. The deviation is interpolated with the <Step> filled in <Well Header>, 50 ft inthis case.

However the constrain points are included in the wellpath, as shown below:

MD Incl Azi TVD North East VS DLS[ft] [deg] [deg] [ft] [ft] [ft] [ft] [º/100ft]

0.00 0.00 0.00 0.00 0.00 0.00 0.00

50.00 0.00 0.00 50.00 0.00 0.00 0.00 0.00

100.00 0.00 0.00 100.00 0.00 0.00 0.00 0.00

--- --- --- --- --- --- --- ---

2100.00 3.00 300.00 2099.91 2.62 -4.53 5.11 1.50

2150.00 3.75 300.00 2149.82 4.09 -7.08 7.98 1.50

2166.67 4.00 300.00 2166.45 4.65 -8.06 9.08 1.50

2200.00 4.67 300.00 2199.69 5.91 -10.24 11.54 2.00

2250.00 5.67 300.00 2249.48 8.16 -14.14 15.93 2.00

2300.00 6.67 300.00 2299.19 10.85 -18.79 21.17 2.00

2350.00 7.67 300.00 2348.80 13.97 -24.19 27.25 2.00

2366.67 8.00 300.00 2365.32 15.10 -26.16 29.47 2.00

2400.00 8.00 300.00 2398.32 17.42 -30.18 34.00 0.00

2450.00 8.00 300.00 2447.84 20.90 -36.20 40.79 0.00

On this sheet, the user may do interpolations by picking up [Interpolate] menu.


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Graphs sheet

Every time the [Calculate] is pressed (on Design sheet) the wellpath Horizontal and Verticalprojections are shown here. The charts may be customized. The user may change the X andY scales, fonts size, etc.

Note: Be aware, the Horizontal Section chart is usually distorted as the X and Yscales are different.

The coordinates shown here are the coordinates relative to the well head. If the user wants tosee the well with UTM coordinates, ha can use the [Draw Wells] feature.

On both charts are figured the constraints points of the wellpath, with their labels.The VS angle, printed in the top of the chart, is the one filled in by the user, in <WellHeader>.


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Drawings sheet

The horizontal and vertical projections of the wellpaths are displayed here. The user hasgranted access to the sheet in order to customize the charts as he wants.

The output will look like hereafter:


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Anti-collision sheet

On this sheet the user can see a ladder plot of the selected offset wells.

This is the reason you may see some curves going out of the chart and coming back later.

Note: As you could read here, the calculation is done center-to-center.


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ISCWSA anti-collision models

There is a beta version in work (it still requires some tweaks), which implements theISCWSA model rev.5. but also, the obsolete versions 1-4 for backward compatibility issues.


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Intermediate values of the functions of the selected models calculated by Survey, andexample file provided by ISCWSA, respectively:

Anti-collision output (here offset well only):

The distances between ellipsoids and ellipses use the ZPM method which provides exactdistances, and not the “pedal curve” which may be either optimistic, or pessimistic.


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Trajectory sheet

On this sheet the user can do all the operations he is allowed to do on <Design> sheet, andeven more! The only operation he cannot do is overwriting a designed trajectory.Probably the most exciting operation is the loading of either of the two types of trajectories(designed or planned), including the connected segments to surface, like in the followingexample:

In this case, a designed trajectory was picked up and, as the Tie on point is not at wellhead,the <Load well from surface> check box is enabled and, if checked, it will load and displaythe full deviation for the picked branch, from bottom to surface, as a single, continuouswellpath.

The loaded deviation is calculated automatically and, in the rightmost column of the table,the user would be able to see to which well segment (branch) is each station belonging.

The loaded deviation can be saved (if it is an actual data) or saved as new branch in theopened well, or saved as new branch in a new well file, thus creating a new well, with oneactual deviation.

However, only the deviation connected to surface (MD=0) can be saved as new well, inorder to avoid “floating” wellpaths.The sheet is versatile and allows the direct input or paste of a set of data that can be saved inan already opened well.The data pasted (MD, Inclination and Azimuth if connected to surface, plus the TVD, Northand East of the first station, if not) can be calculated pressing [Calculate].

License sheet

The file may be only freely distributed and may not be sold. It is distributed "as is". Nowarranty of any kind is expressed or implied. You're using it at your own risk. The authorcannot be liable for data loss, damages, loss of profits or any other kind of loss while usingor misusing this software. You may not use code, copy, emulate, clone, rent, lease, sell,


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modify, decompile, disassemble, otherwise reverse engineer the program, or any subset ofthe licensed program. All rights are reserved by Marius Tulceanu.The program is based on SPE paper 84246 by Steven Sawarin and J. Thorogood from BPand "Improved method makes a soft landing of well path" by Xiushan Liu, Zaihong Shi.Special thanks to Steve for sending me some code for this program.The program was tested on Win XP 32 bits with Office 2007 and on Win 8 64 bits withOffice 2013, English versions, but it still may have some flaws.

It requires macro security medium setting.

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User Manual of SURVEY - drill-byte