Information System BOHRIS. version: Program. Date:

Transcription

1 BOHRIS web Wellbores Information System User Manual Program version: Date:

2 TABLE OF CONTENTS 1 GENERAL INFORMATION PROGRAM FUNCTIONS DATA STRUCTURE BOHRIS - ENTERING AND EDITING DATA STARTING THE PROGRAM EDITING BASIC DATA General structure and behaviour Geological province Storage WELLBORES SECTION CASINGS SECTION COMPLETIONS SECTION Overview Tubings Gravel packs Subsurface safety valves (SSSV) Completion elements WELLBORE EQUIPMENT SECTION Overview Perforations Plugs Milling sections Cement bridges WELL HEAD SECTION Overview Well head elements WELL BARRIER SYSTEM SECTION Overview Barrier elements Cap rock/reservoir WBS Template MAASP CALCULATOR SECTION Overview Well parameter Annulus Data

3 2.9.4 MAASP Calculation CAD DRAWINGS SECTION Overview General functions BOHRIS DRAWINGS CASING SCHEME COMPLETION SCHEMATIC (PACKER/TAILPIPE) COMPLETION SCHEMATIC (SSSV) WELL BARRIER SCHEMATIC APPENDICES

4 General information 1.1 Program functions The BOHRIS program package is used for the structured recording of wellbore data thus enabling the standardised display and documentation of wellbore specifications, irrespective of the date when the wellbore was created and the quality of the individual documentation previously available. All data is stored in a central database. Fig. 1 BOHRIS functional scope (* not part of the demo version) The software covers the following five functional areas (Fig. 1): Data editing: o Entry and editing of wellbore data o Import of mass data (trajectory, gamma log) from CSV files o Storage of data in database tables (guarantee of referential integrity) o Data import using SQL insert statements directly into the relevant database table (requires SQL knowledge and database access) 4

5 Reporting: o Provision of standard reports (master data sheet, event log (filtered where appropriate)) o Output of reports as PDF files on printer or data storage medium o Extension and adaptation of existing reports and creation of new reports on request Visualisation: o Generation of drawings Casing scheme Casing scheme (sectional view) Completion schematic Completion schematic SSSV Wellhead schematic Well barrier schematic o Storage of drawings in DWG format and optionally as a PDF file Data repository: o Creation of a wellbore-based directory structure o Storage of generated drawings and reports in corresponding sub-directories o Storage of external documents/files using Windows tools (e.g. file explorer) Calculations: o Calculation of maximum allowable annulus surface pressures (MAASP) o Derivation of the maximum allowable wellhead operating pressures (MAWOP) 1.2 Data structure The wellbore data is stored in BOHRIS according to a defined structure with three hierarchical levels (Fig. 2). The top level reflects the geological spatial classification and is called Geological province. Geological province groups together regions with similar geological characteristics (stratigraphy). The stratigraphy definition is saved at this level. A Geological province can contain one or more Reservoirs or drilling fields. This level of classification is purely for organisational purposes. The wellbore data for a specific reservoir is managed in the third classification level. All data relevant to the wellbore is classified technically and stored in approx. 15 tables, with the underlying wellbore listed for reference. In addition to the purely technical data, a range of supplementary data is also saved in the form of catalogues, which are stored in tables. This includes catalogues of common tube diameters (imperial/metric), material codes and various type definitions (completion, wellhead, casing strings, etc.). Some additional information needed for program control (e.g. field label and tooltip texts, directory structure) is also stored in database tables. 5

6 BOHRIS - Documentationn and visualization of wellbore data - user manual Fig. 2 Technical data structure 6

7 BOHRIS - Documentationn and visualization of wellbore data - user manual 2 BOHRIS - Entering and Editing Data 2.1 Starting the program BOHRIS web demo is accessible under the URL Fig. 3 BOHRIS start page The user account necessary to enter the application can be received after registering on After receiving the account information the user can log in to the application via Account/Sign in (Fig. 4). 7

8 Fig. 4 BOHRIS Sign in 2.2 Editing basic data General structure and behaviour Based on the data structure described in chapter 1.2 all existing objects of the three hierarchical levels assigned to the appropriate user group to which the current user belongs to are shown as tree (Fig. 5). Depending on the selected object (geological province, storage or wellbore) a set of sub forms (menu item Entities) is available for viewing and editing wellbore data (Table 1, Fig. 6). Fig. 5 BOHRIS object tree The following forms are available: Table 1 Overview BOHRIS forms Form Content 8

9 Geological Provinces Storages Wellbores Casings Completions Wellbore Equipment Well Head Well Barrier System MAASP Calculator CAD Drawings Definition of geological provinces Definition of all storages belonging to a geological province Definition of base properties of a wellbore Definition of casing data separated into conductor pipe, casings and liner Definition of completion data separated into different sections (tubing, gravel pack, subsurface safety valve, completion elements) Different sections describing additional wellbore equipment (perforations, plugs, milling sections, cement bridges) Definition of well head elements. Definition of well barrier elements and editing of data related to well barrier schematics. Definition of additional well parameters necessary to calculate maximum allowable annulus surface pressure (MAASP) Generation and download of different wellbore related drawings. Fig. 6 BOHRIS Sections menu In general all detail data is displayed in table format. To apply changes on existing data sets the action buttons located at the end of each table row must be used. Creating a new data set can be performed using the appropriate button above the table. Furthermore the whole table can be hided or displayed. If the content of a table exceeds one page scrolling between the pages of a table is possible (Table 2). Table 2 Action buttons on table data 9

10 Button Action View all detail data of the data set Edit the data set Delete the data set Duplicate the data set (wellbores only) Creating a new data set Hide or display the detail data table Scrolling one page back or forward Save the detail data Cancel and leave the detail data window without changes When creating a new data set (or editing an existing one) different field types can apply. A mandatory field is marked with a red frame and if selected with the information that this field is required. Read only fields are filled normally by the application. These fields are marked with a gray background color. All other fields (input or selection list fields) have a white background color and can be left blank. As long as not all mandatory fields of a data set are filled correctly the Save button is blocked (Table 3). Table 3 Field types Field Restrictions Normal input or selection list field Read only field 10

11 Mandatory selection list field Mandatory input (edit) field 11

12 2.2.2 Geological province Geological province represents the highest level in the data structure (Chapter 1.2). This is a regional area characterised by similar stratigraphy characteristics. For this reason, the relevant stratigraphy units are defined at this level. The geological province itself can be created, changed, and deleted using the relevant buttons. Deletion has a cascading effect, which means that all data objects belonging to a geological province (reservoir, wells, etc.) are also deleted. The geological province is ultimately represented only by a name or a description. No further characteristics exist. Table 4 Geological provinces section Field Name Content Name of the geological province (255 characters) 12

13 2.2.3 Storage The storage level enables several wells to be logically grouped together. Each storage contains a reference to the higher level geological province. Therefore, a storage cannot be created until at least one geological province has been defined. Function buttons are available to create, change/edit, and delete a storage (Table 5). Table 5 Storages section Field Name Description Geological Province Content Name of the storages Description of the storage Geological province the storage belongs to A storage is identified by a reference to the geological province and by a name and a descriptive text. 13

14 2.3 Wellbores section The well is the central element in the BOHRIS data structure. The basic data can be entered for each well. Well data is edited in a similar way to the higher-level entities (storage, geological province). The display fields are activated by selecting the Edit or Create buttons. Changes must be saved using the Save button. In addition to the normal Create, View, Edit and Delete functionality it is now also possible to duplicate or copy a well. This creates a duplicate copy of the well in the database. When a well is created, the complete directory structure for the well is created on the server side file system. Alternatively, this process can also be started manually using the Create repository structure button. Table 6 Wellbores Field Name UWI Description Storage Elevation [m asl] Drilled Final Depth [m] MD Drilled Final Depth [m bsl] TVD Artificial Final Depth [m] MD Artificial Final Depth [m bsl] TVD Northing [m] Easting [m] WGS84 Latitude WGS84 Longitude Spud Date [year] Spud Date [date] End Of Drilling [year] End Of Drilling [date] Commissioning [year] Commissioning [date] Wellbore Name (long) Content Name of the well Unique Well Identifier (well identification number) Detailed description of the well Storage the wellbore belongs to Elevation of the well location in meters above sea level Final drilled depth (measured depth) in meters Final drilled depth (true vertical depth) in meters below sea level Artificial final depth (measured depth) in meters Final artificial depth (true vertical depth) in meters below sea level Northing of well location in meters (Gauss-Krüger) Easting of well location in meters (Gauss-Krüger) Geographical latitude (WGS84) of the well location Geographical longitude (WGS84) of the well location Year in which drilling started Exact date on which drilling started (YYYY-MM-DD) Year in which drilling ended Exact date on which drilling ended (YYYY-MM-DD) Year in which drilling was commissioned Exact date of commissioning (YYYY-MM-DD) Name of the well (detailed) 14

15 15

16 2.4 Casings section In the Casings section, you can enter the data for casing strings, the conductor pipe and any liners used. The casing data is required for a range of casing string calculations and for generating the drawing of the casing scheme. Fig. 7 Casings section The form which is used for entering the data of the different casing types is similar for all casings (conductor pipe, casings and liner). When creating a conductor pipe or a liner the appropriate casing type is preselected (Table 7). 16

17 Table 7 Casing data Field Content 17

18 Casing Type Description OD [in] Depth From [m] MD Depth To [m] MD Bit Size [in] Weight [lb/ft] Wall Thickness [mm] Material Grade Thread type Cement from [m] MD Cement to [m] MD Landing Load [t] Liner Hanger [m] Liner Hanger Type Piled? Cement Head [m] TOC 1 [m] TOC 2 [m] Sliding Side Door [m] Wellbore Name of the casing string type (preselected for Conductor Pipe and Liner) Descriptive text Dimension of casing string (outer diameter in inches (fractional)) data from selection list Depth from (in meters (MD)) Depth to (in meters (MD)) Dimension of drilling bit Casing string weight in pound per foot data from selection list depending on selected dimension Wall thickness in mm - populated automatically when casing string weight is selected Material grade (selection list) Type of thread (selection list) Cementing from (in meters (MD)) Cementing to (in meters (MD)) Landing load of the casing string Liner hanger position (only for liner) Type of liner hanger (only for liner) Information regarding whether the conductor pipe was piledriven. (not relevant for casing and liner) Position of the cement head (m) Position of an additional cement head (if applicable) (m) Position of an additional cement head (if applicable) (m) Position of a Sliding side door [m] Wellbore the casing belongs to 18

19 2.5 Completions section Overview The Completion section allows the user to enter completion data for the well. This includes details of the tubing, the packer/tailpipe section (completion elements), the section of the subsurface safety valve, and gravel packs. The completion data forms the basis for creating the drawings of the completion schematic and the SSSV completion (see chapter 2.5.5). The completion schematic button opens the latest version of the completion schematic (PDF) created on the server side. In the same way, the SSSV completion schematic opens the current PDF version of the SSSV completion schematic for the well. Fig. 8 Completions section Tubings The tubing table contains information about the tubing string. The tubing can be split into sections with different dimensions and material properties. For creation of the drawing, depth specifications and tubing dimensions in particular are important. The tubing dimensions are selected from a catalogue table. When the tubing diameter has been selected, the catalogue of tubing weights is updated. When a tubing weight is selected, the wall thickness field is populated automatically. The material code and thread type can also be selected from the relevant catalogues (Table 8). Table 8 Data fields: Tubing 19

20 Field OD [in] Depth From [m] MD Depth To [m] MD Weight [lb/ft] Wall Thickness [mm] Material Grade Thread Type Landing Load [t] Wellbore Content Dimension of tubing string (outer diameter in inches (fractional)) (selection list) Depth from (in meters (MD)) Depth to (in meters (MD)) Tubing string weight in pound per foot (selection list content depends on selected dimension) Wall thickness in mm - populated automatically when tubing string weight is selected Material grade (selection list) Type of thread (selection list) Landing load of the tubing string (MAASP calculation) Wellbore the tubing belongs to Gravel packs The depths are required entries here. Remarks on the filter and general comments are optional entries. You can also specify whether the well is cased or open hole as well as information concerning the gravel material. These entries are taken into account in the creation of the casing scheme. Table 9 Data fields: Gravel packs 20

21 Field Description Depth from [m] MD Depth to [m] MD Cased hole? Grain size Material Wellbore Content Descriptive text / comment Depth from (in meters (MD)) Depth to (in meters (MD)) Is the gravel pack located in a cased or open hole section? Grain size of the gravel Type of gravel material Wellbore the gravel pack belongs to Subsurface safety valves (SSSV) The SSSV section can also be documented in a similar way to the entry of completion elements in the completion elements section. The data fields are almost the same (Table 10). The graphical representation is shown in a separate completion schematic - SSSV. 21

22 Table 10 Data fields: Subsurface safety valves Field Completion Type Description Nominal size [in] Depth from [m] MD Depth to [m] MD Max OD [mm] Min ID [mm] Collapse Resistance [bar] Vendor Wellbore Content Type of completion element (selection list) Additional information to the specific component Nominal size of the element Depth from (in metres (MD)) Depth to (in metres (MD)) Maximum outer diameter of the completion element Minimum inner diameter of the completion element Collapse resistance (necessary for MAASP calculation) Vendor of the completion element Wellbore the SSSV completion element belongs to Completion elements The completion elements (packer/tailpipe) installed in the well are entered in the Completion elements table. Each completion element must be assigned to an completion element type. When the completion element type is selected, it is simultaneously assigned to a graphical symbol that is displayed in the completion schematic. Further details are depth and an explanatory text that describes the component (component description). 22

23 Table 11 Data fields: Completion elements Field Completion Type Description Nominal size [in] Depth from [m] MD Depth to [m] MD Max OD [mm] Min ID [mm] Pressure Rating [bar] Collapse Resistance [bar] Burst Resistance [bar] Vendor Wellbore Content Type of completion element (selection list) Additional information to the specific component Nominal size of the element Depth from (in metres (MD)) Depth to (in metres (MD)) Maximum outer diameter of the completion element Minimum inner diameter of the completion element Pressure rating (necessary for MAASP calculation) Collapse resistance (necessary for MAASP calculation) Burst resistance (necessary for MAASP calculation) Vendor of the completion element Wellbore the SSSV completion element belongs to 23

24 2.6 Wellbore Equipment section Overview The Wellbore Equipment section enables the entry and editing of perforation and milling sections, cement bridges, and plugs. When relevant data has been entered, this is displayed in the casing scheme. The Casing scheme button opens the latest casing scheme (PDF version) of the wellbore if created before (see Chapter 2.10). Fig. 9 Wellbore Equipment section Perforations All data to be entered for a perforation is listed in Table 12. The depth specifications of the perforated section are essential. Optionally, you can also enter the date of the perforation. In addition, it is also possible to document the partial or total cementation of a perforation by entering the cementation date and section. 24

25 Table 12 Data fields: Perforation Field Description Depth From [m] MD Depth To [m] MD Perforated [Year] Perforated [Date] Cement from [m] MD Cement to [m] MD Cemented [Year] Cemented [Date] Drilled out? Wellbore Content Descriptive text / comment Depth from (in metres (MD)) Depth to (in metres (MD)) Year of perforation Full date of the perforation (DD.MM.YYYY) Start of the cementation section (in metres (MD)) End of the cementation section (in metres (MD)) Year of cementation Exact date of cementation (DD.MM.YYYY) Has cementation been drilled out? Wellbore the perforation belongs to Plugs The plugs located in the well can be recorded in the Plugs table. Depth data and a specification of the plug type are required. 25

26 Table 13 Data fields: Plugs Field Plug Type Description Depth From [m] Depth To [m] Wellbore Content Name of plug type (selection list) Descriptive text / comment Depth from (in meters (MD)) Depth to (in meters (MD)) Wellbore the cement bridge belongs to 26

27 2.6.4 Milling sections Milling sections for the respective casing strings of the well can be entered in the Milling sections table. The selection of a casing type and the depth of the milling section are required entries. Table 14 Data fields: Milling sections Field Depth From [m] Depth To [m] Casing Type Milled [Year] Milled [Date] Description Wellbore Content Depth from (in metres (MD)) Depth to (in metres (MD)) Selection of casing type which was milled Year of milling Exact date of milling Descriptive text / comment Wellbore the cement bridge belongs to 27

28 2.6.5 Cement bridges The cement bridges table (Table 15) enables entry of the depth and the date when a cement bridge was incorporated into the well. A distinction is made between a cement bridge and a plug. Table 15 Data fields: Cement bridge Field Cement Bridge Type Description Depth From [m] Depth To [m] Cemented [year] Cemented [date] Wellbore Content Selection of cement bridge type (selection list) Descriptive text / comment Depth from (in metres (MD)) Depth to (in metres (MD)) Year of cementation Exact date of cementation Wellbore the cement bridge belongs to 28

29 2.7 Well head section Overview The Well head section enables the user to enter the components of the wellhead. Fig. 10 Well head section Well head elements The entry of all components and component groups of the wellhead forms the basis for the generation of a wellhead schematic. Each component must be assigned a consecutive number when entered. Then select the corresponding component type. Three free text fields (Description, Remark, Element characteristic) are available for entering a detailed description of the component. It is also possible to specify the dimensions (in inches) and the nominal size for the top, bottom, and side outlet connection (also in inches). An pressure rating can also be selected for these three outlets in accordance with the API standard. Table 16 Field Sequential number Element type Description Dimensions [in] Nominal size top flange [in] Pressure range top flange [psi] Nominal size bottom flange [in] Data fields: Well head Pressure range bottom flange [psi] Nominal size sideoutlet flange [in] Pressure range sideoutlet flange [psi] Remark Wellbore Content Sequential number of the element Type of the well head element (selection list) Descriptive text Dimension in inches (fractional) Thread - nominal size, top connection in inches (selection list) API pressure rating of top connection (selection list) Thread - nominal size, bottom connection in inches (selection list) API pressure rating of bottom connection (selection list) Thread - nominal size, side outlet connection in inches (selection list) API pressure rating of side outlet connection (selection list) Remarks to the well head element Wellbore the cement bridge belongs to 29

30 30

31 2.8 Well Barrier System section Overview The Well Barrier System section (Fig. 11) is used to enter all the data required for generation of a well barrier schematic (WBS). This includes: - selection and creation of barrier elements, - input of the depth limits for the cap rock and the reservoir and - selection of the appropriate drawing template. The well barrier schematic can be displayed as a PDF (if it was already generated). Fig. 11 Well Barrier System section Barrier elements Well integrity is assessed based on standard DIN EN ISO Both the generation of a barrier schema and the calculation of the maximum allowable annular surface pressures (MAASP) require specification of the barrier elements (Table 17). The barrier elements are usually - casings - completion elements - well head elements These elements are managed in the corresponding BOHRIS sections (Casings, Completions, Well head). The creation of barrier elements takes place in several steps: 1. Selection of the Barrier Type and then selection of the element (field: Description). 2. Assignment of a (unique) element number (field: Sequential number) 3. Selection of the Barrier Stage 31

32 4. If the element is relevant for the MAASP calculation, then the MAASP Item Type must be selected 5. Selection of the Verification Type 6. Input of the verification result (field: Verification Result) When the barrier element is selected, the data fields not specified in the above list are initially populated with the values from the original data records. This includes the data relating to depth and cementation depths, dimensions, material properties, and strength. Unless the fields are write-protected, the contents can be changed by the user. A subsequent modification of the data in the original tables (casings, completion and well head elements) does not lead to a change in the corresponding barrier elements. If you want to copy the modified data from the original data records, then the element (field: Description) needs to be selected again. Table 17 Field Sequential number Barrier type Description Barrier Stage MAASP Item Type Dimension [in] Depth from [m] MD Depth to [m] MD Cemented from [m] MD Cemented to [m] MD Verification Type Verification Unit Verification Result Verification Comment Pressure rating [bar] Collapse resistance [bar] Burst resistance [bar] Weight [lb/ft] Wall thickness [mm] Material grade Landing load [t] Top of cement [m] MD Wellbore Data fields: Barrier elements Content String containing the element position or number Preselection of a group of barrier elements (i.e. Tubing, Casing) Name of the barrier element (selection list) Selection of barrier stage (selection list) Selection of the MAASP item type (depends on barrier stage) Outer diameter (inch decimal) of the element read only Element depth from (meters MD) Element depth to (meters MD) Cemented from (meters MD) Cemented to (meters MD) Selection of a verification type Type-dependent unit of the verification result - read only Result of verification Comment about verification and/or verification result Pressure rating [bar] Collapse resistance [bar] Burst resistance [bar] Material weight [lb/ft] - read only Wall thickness [mm] - read only Material grade - read only Landing load [t] - read only Top of cement (meters MD) - read only Wellbore the barrier element belongs to 32

33 33

34 BOHRIS - Documentationn and visualization of wellbore data - user manual Cap rock/reservoir The barrier schema also contains a schematic view of the layerr depth of the cap rock and the reservoir (Fig. 12). In order to display thee corresponding depth ranges correctly in the barrier schema, this data must be entered by thee user (Table 18). Thiss data is entered in the Cap rock/reservoir page. Table 18 Data fields Cap rock / Reservoir Field Wellboree Lithology Type Description Depth From [m] Depth To [m] Wellboree Content Selection of lithology type [Cap rock / Reservoir] Additional description Top of the layer in meter Bottom of the layer in meter Wellbore the Cap rock / Reservoir element belongs to Fig. 12 Display of the layer depths of cap rock and reservoir inn the barrierr schema. 34

35 BOHRIS - Documentationn and visualization of wellbore data - user manual WBS Template To generate a well barrier schematic (WBS) an appropriate drawing template is needed. This templatee must be selected by the user before starting the drawing generation. Table 19 shows the list of WBS templates currentlyy available. Table 19 Data fields WBS Template Field WBS Template Content Selection of the well barrier schematic template type 2.9 MAASP Calculatorr section Overview The MAASP Calculator section (Fig. 11) is used to enter all the data required for calculation of the maximum allowable annulus surface pressuree (MAASP). This includes: - input of the relevant well parameters, - specification of the data required for calculation of the maximum m allowable annular surface pressures (MAASP) - display of the maximumm allowablee annular surface pressures (MAASP) and the max- imum allowable wellhead operating pressures (MAWOP). After inserting the values necessary for the calculation the MAASP calculation can be trig- gered on the application server. 35

36 Fig. 13 MAASP Calculator section 36

37 2.9.2 Well parameter The data entered in the Well parameter sub form (Table 20) is required for performing the MAASP calculation. This is data relating to the conditions (pressure and temperature at the wellhead and bottom of hole) at the time of well completion, and the upper and lower operating limits. To create the well barrier schema, it is essential that the correct drawing template is selected (field: WBS Template). Table 20 Data fields Well parameters Field Wellhead pressure [bar] Bottom hole pressure [bar] Wellhead temperature [ C] Bottom hole temperature [ C] Well Head pressure rating [bar] Formation strength gradient [bar/m] WBS Template Wellbore Content Wellhead pressure at time of well completion Maximum operational limits Minimum operational limit Bottom hole pressure at time of well completion Maximum operational limit Minimum operational limit Wellhead temperature at time of well completion Maximum operational limit Minimum operational limit Bottom hole temperature at time of well completion Maximum operational limit Minimum operational limit Pressure rating of the well head Gradient of formation strength [bar/m] Selection of well barrier schema drawing template Wellbore the well parameters data set element belongs to 37

38 2.9.3 Annulus Data The Annulus Data sub form enables the entry of annular space input data for the annular space pressure calculation, as well as display of the calculation results. Input data for the calculation includes the pressure gradients of the annular space fluids (mud/brine gradient) and the results of the leak off test (LOT) for annulus B and, if applicable, annulus C. Optionally, the test pressure of the individual annular spaces can also be specified. In order to determine operating pressures at the wellhead (MAWOP) from the calculated MAASP pressures, the MAWOP safety margin also needs to be specified. This can be in the range from 0 to 100 percent. The annular space pressures are calculated using an external program (MAASP Calculator). Table 21 Data fields Annulus Data Field MAASP[bar] MAWOP [bar] Fluid Gradient [bar/m] Test Pressure [bar] MAWOP safety margin [%] Leak Off Test (LOT) [bar] LOT reference depth [m] TVD Wellbore Content Calculated maximum allowable annular space pressure (MAASP) values for existing annuli (read only). Calculated maximum allowable wellhead operating pressure (MAWOP) (reduction of MAASP by MAWOP safety margin) Mud/brine gradient of annulus fluid Measured test pressure Safety margin in % for MAWOP calculation (percentage of reduction from MAASP). Leak off test pressure Reference depth (TVD) of leak off pressure test Wellbore the annulus data set belongs to 38

39 2.9.4 MAASP Calculation The maximum allowable annular surface pressures (MAASP) are calculated using an external calculation program. As a prerequisite for successful calculation, all necessary data must be available (barrier elements, well parameters and annulus data). This data is entered in the above tables or sub forms (Chapter ) and is then formatted in the database so that it can be imported by the calculation program on the server. button. Subse- The calculation of MAASP values is invoked by the quently an information message is shown: If the calculation was successful another message is shown and the MAASP and MAWOP values in the Annulus Data section are updated. If the calculation failed an error message containing a description of the cause of the error is shown: In that case it is recommended to check the completeness of the input data necessary for the MAASP calculation. 39

40 2.10 CAD drawings section Overview The CAD Drawings section (Fig. 14) is used to trigger the creation of drawings, which is performed on the server. Drawings that have already been generated can be opened (or downloaded) and displayed as a PDF file. Fig. 14 CAD Drawings section General functions On the CAD Drawing section page, three buttons are available for all drawings that can be generated on the server. The left-hand button is used to trigger the generation of a drawing (as a process on the server). The right-hand button downloads the most recent PDF version of the already generated drawing from the server. The middle button downloads the most recent PDF version of the already generated drawing from the server and displays it in the PDF reader configured in the operating system. Table 22 Button CAD Drawings section - General functions Action Server side creation of the drawing. Download and display of the latest drawing (PDF). Download of the latest drawing (PDF). After invoking the server side drawing generation an activity window is displayed. If the drawing was successfully generated an information message is shown: 40

41 In case of any failure concerning the drawings generation after exceeding the timeout limit an error message is shown: 41

42 3 BOHRIS drawings One of the major functionalities of BOHRIS is the possibility to generate various specific drawings based on the wellbore data entered before. The drawings were generated on the server side. For an overview of the drawings that can be generated, see Table 23. Table 23 Drawing type Casing scheme Completion schematic SSSV Completion schematic Well barrier schematic Overview of the diagrams to be generated Contents Diagram of the casing scheme including details of layer depth (MD/TVD), stratigraphy, casing, and depth-specific special features Schematic (not to scale) representation of all completion elements of the packer/tailpipe section with details of name and layer depth Schematic (not to scale) representation of all completion elements in the SSSV section Representation of barrier schematic according to template selection 3.1 Casing scheme The casing scheme is a depth-scaled graphical representation of the whole well based on a well bore diagram. All major information is available at a glance (Appendix 2). To ensure that the casing scheme drawing is generated without errors, a range of various data is required. The corresponding data fields are highlighted in bold in the description of the input forms (Chapter 2). The drawing comprises the following sections: - Header data (well name, drilled final depth, altitude of the well location) - Casing string table (tabular representation of all casing strings - conductor pipe, casing, liner and tubing) - Depth scale (MD and TVD, use of trajectory data or height/depth data above sea level) - Stratigraphy (representation of the stratigraphic units from the formation type system) - Casing (diagram and labelling of the casing elements including perforation, cementation, plugs, cement bridges, casing shoe, SSSV, etc.) - Special features (depth-specific representation of additional information entered as special features) - Marking of areas with sectional views - Marking/highlighting of special areas (usually reservoirs etc.) 3.2 Completion schematic (packer/tailpipe) The completion schematic represents the completion elements entered in the database (Chapter 2.5) at their depth relative to each other. Each element type is represented by a 42

43 characteristic symbol (Appendix 1). Elements for which no symbol exists are represented by a placeholder symbol (DUMMY). During drawing generation, all elements to be displayed are scaled so that there is sufficient space in the intended page area (diagram not to scale). The drawing is also labelled with the name of the completion type and the element name, and the depth specifications of the top and bottom edge of the completion element. The drawing comprises the following sections: - Header data (well name) - Outline of completion elements - Label (name of element type, element name) - Depth assignment (top edge/bottom edge with depth in m (MD)) 3.3 Completion schematic (SSSV) In the same way as the completion schematic, it is also possible to generate a separate completion outline for the SSSV section (Appendix 4). The procedure is identical to the representation of completion elements. Access is made to the same symbol library. The drawing has exactly the same structure as the completion outline. 3.4 Well barrier schematic The well barrier schematic consists of a list of the barrier elements that belong to each barrier with their current verification status (verification result). The calculated annular space pressures (MAASP and MAWOP) are also shown in the drawing header. In addition to the tabular list of barrier elements, these are shown schematically (not to scale). The schema type to be shown must be selected by the user. The depths of the most important barrier elements are also shown for specific wells In addition to the well barrier schema, a schematic view of the depth of cap rock and gravel layers is also shown (Appendix 5). 43

44 4 Appendices Appendix 1 List of completion elements... 1 Appendix 2 Example: Casing scheme... 4 Appendix 3 Example: Completion schematic - packer/tailpipe section... 5 Appendix 4 Example: Completion schematic SSSV section... 6 Appendix 5 Example: Well barrier schematic

45 Appendix 1 List of completion elements A - 1

46 A - 2

47 A - 3

48 Appendix 2 Example: Casing scheme A - 4

49 Appendix 3 Example: Completion schematic - packer/tailpipe section A - 5

50 Appendix 4 Example: Completion schematic SSSV section A - 6

51 Appendix 5 Example: Well barrier schematic A - 7