| Name | Leak_Off_Test |
|---|---|
| Entity Type | Table |
| Description | An activity to ascertain the integrity of the formation. It includes Leak Off Test (LOT) and Pressure Integrity Test (PIT). It is commonly performed during drilling, after casing cementation, to determine the pressure integrity at casing shoe depth. |
| Submodel | WS_Activity |
| Entity Scope | Project |
| Primary Key | Id |
| Natural Key | |
| Generalizations | Borehole_Activity , Wellsite_Activity , Activity , Entity , IT_Object , Tracked_Object |
| Specializations |
| Name | Value Domain | Property / Storage Unit | Description | Required / Default | Type |
|---|---|---|---|---|---|
| Activity_Program_Id | Activity_Program |
|
Reference to the program during which the activity was performed. | No |
NUMBER(38) |
| Activity_State | STRING64 | NA |
The current state, or status, of the activity. Activity state is a refinement of the lifecycle indicator Existence_Kind. For example, a drilling job whose Existence_Kind is "Actual" could have an activity state of "turning to the right", "suspended due to weather", or "tool makeup or breakdown". An activity whose Existence_Kind is "Required" could have State values like "under investigation", "proposed" and "AFE approved". Note: The valid list of activity states will vary from one kind of activity to another, so the values entered into this column are not validated via a lookup table. | No |
VARCHAR2(64) |
| Activity_Template_Id | Activity_Template |
|
The identifier of the activity template which activates or characterizes the Activity. | No |
NUMBER(38) |
| Actual_LOT_Pressure | double | Pressure kPa |
The Pressure at surface when formation leak off actually occurred during the Leak off Test (LOT) or the maximum surface pressure applied for Pressure Integrity Test (PIT) | No |
NUMBER |
| Borehole_Id | Borehole |
|
The identifier of the borehole in which the activity occurred. | Yes |
NUMBER(38) |
| Duration | double | Time s |
The duration of the activity. For planned activities, this would be expected duration. | No |
NUMBER |
| End_Date | DATE | NA |
The date and time at which the activity will end or did end. For planned activities, this would be expected end date. | No |
DATE |
| End_MD | double | Depth m |
Measured depth at the end of the activity or proposed depth end of the activity. | No |
NUMBER |
| Existence_Kind | REF_EXISTENCE_KIND | NA |
A reference value that describes the state of existence in the lifecycle of the entity, for example, Planned, Predicted, Required, Simulated, and Actual. | Yes Actual |
VARCHAR2(64) |
| Expected_LOT_Pressure | double | Pressure kPa |
The Pressure at surface when formation leak off is expected to occur during the Leak off Test (LOT). | No |
NUMBER |
| External_Reference | STRING64 | NA |
A value that is used by an external organization to reference this activity. For example, if an external organization is hired to perform this activity, this column could be used to store the work order or purchase order number that organization uses to reference this activity. | No |
VARCHAR2(64) |
| Fluid_Density | double | Mud_Density kg/m3 |
Density of well fluid in borehole when LOT / PIT is conducted. | No |
NUMBER |
| Fluid_Type | CODE | NA |
The type of well bore fluid | No |
VARCHAR2(64) |
| Formation_Id | Borehole_Zone |
|
The formation that is being tested by the LOT | No |
NUMBER(38) |
| Formation_MD | double | Depth m |
Measured depth of the formation at which fracture is expected to occur. | No |
NUMBER |
| Formation_TVD | double | Depth m |
Computed value of True Vertical Depth of the formation where LOT is expected to occur. It is denormalized data to aid ready calculation of formation fracture gradient. | No |
NUMBER |
| Fracture_Flag | boolean | NA |
A flag to indicate whether or not the formation fracture actually occurred during the test. When formation fracture does not occur, the test values refer to Pressure Integrity Test. | No |
NUMBER(1) |
| Fracture_Gradient | double | Pressure_Per_Length kPa/m |
Formation Fracture Pressure expressed as a Gradient which is Pressure per unit Length. | No |
NUMBER |
| GUID | STRING128 | NA |
Globally Unique IDentifier for an instance of a class. USAGE NOTES: There are two cases: 1) GUID is not populated or used; and 2) it is populated with a value that is globally unique. If the GUID is populated there are two means of doing so for a given project: 2a) Seabed automatically generates and populates the GUID when an instance is created (valid only on Oracle based systems); and 2b) the GUID is generated and populated by an application (other than Seabed) on instance creation. Whether Seabed automatically generates GUIDs for a project is determined by the Auto_GUID flag in SDS_Account. Note that techniques 2a and 2b can coexist in the same project. When GUIDs are automatically generated an application can override the automatically generated GUID with its own GUID by simply supplying the GUID value. Applications that generate their own GUIDs and populate the GUID column will function correctly on projects which have automatic GUID generation turned on. | No |
VARCHAR2(128) |
| Id | ID | No_Unit |
Unique identifier for this entity. | Yes |
NUMBER(38) |
| Insert_Date | DATE | NA |
Date the entity was created in the repository | No |
DATE |
| Insert_User | STRING64 | NA |
The name of the user responsible for the creation of this entity in the repository. | No |
VARCHAR2(64) |
| Internal_Reference | STRING64 | NA |
A value that is used internally within the organization to reference this activity. | No |
VARCHAR2(64) |
| Name | ENTITY_NAME | NA |
The name given to any object or data item, e.g. name of Well, name of Field, etc. | No |
VARCHAR2(255) |
| Original_Source | STRING64 | NA |
The name of the person, Organization or project source that originally provided this entity, e.g. "IHS-EnergyData" or "FinderUpper Stratton Deeper Pool 15" | No |
VARCHAR2(64) |
| Produced_By | STRING64 | NA |
The name of application role that created the entity, for data created programmatically. | No |
VARCHAR2(64) |
| Purpose | STRING255 | NA |
A description of purpose of the activity or its stage | No |
VARCHAR2(255) |
| Remarks | STRING2000 | NA |
Any type of remarks added to an entity instance. | No |
VARCHAR2(2000) |
| SDAT_Label | int | No_Unit |
Label used by the security system for entitlements. SDAT is Secure Data Access Technology. | No |
NUMBER(10) |
| Source | STRING64 | NA |
Name of the person or organization responsible for this entitys E and P content and quality. Not the data technologist or IT expert creating the entity, for which see IT_Object.Insert_User and Update_User. | No |
VARCHAR2(64) |
| Start_Date | DATE | NA |
The date and time at which the activity will start or did start. For planned activities, this would be expected start date. | No |
DATE |
| Start_MD | double | Depth m |
Measured depth at the start of the activity or proposed start depth of the activity. | No |
NUMBER |
| Successful_Flag | boolean | NA |
A flag to indicate whether or not the activity was successful (Yes/No) | No |
NUMBER(1) |
| Time_Offset | double | Time s |
The time offset from the start of the program that this activity is scheduled to start at. This is normally used while planning a job. | No |
NUMBER |
| Total_Cost | double | No_Unit |
The total cost of the activity expressed in the local currency. | No |
NUMBER |
| Transient_Period | R_Transient_Period |
|
A code or name that indicates whether the activity is executed daily, monthly, on demand, etc. | No |
VARCHAR2(64) |
| Triggering_Event_Id | Event |
|
The identifier of the event that triggered the start of this activity. Events can trigger activities. For example, an explosion event could trigger a firefighting activity. Note that this value should not conflict with, or be confused with, the value in Activity_Status.Triggering_Event. | No |
NUMBER(38) |
| Update_Date | DATE | NA |
Date of the most-recent modification to the entity. | No |
DATE |
| Update_User | STRING64 | NA |
The name of the user responsible for the last modification to this entity. | No |
VARCHAR2(64) |
| Version | STRING255 | NA |
The form or variant of the entity. | Yes 1 |
VARCHAR2(255) |
| Work_String_Id | Work_String |
|
The work string used during a borehole activity. | No |
NUMBER(38) |
| From Entity | Link | Description | Implementation Technique | Required |
|---|---|---|---|---|
| Cement_Evaluation | Leak_Off_Test | The leak off test performed to validate the quality of a cement job | Cascade | No |
| LOT_Detail | Leak_Off_Test | The identifier of the Leak Off Test (LOT) to which the individual observation detail records apply. | Cascade | Yes |
| Link | To Entity | Description | Implementation Technique | Required |
|---|---|---|---|---|
| Formation | Borehole_Zone | The formation that is being tested by the LOT | Nullify | No |
| Activity_Template | Activity_Template | _ | Restrict | No |
| Fulfilled_Activity | Activity | _ | Assoc to Many | No |
| Triggering_Event | Event | _ | Nullify | No |
| Transient_Period | R_Transient_Period | _ | Restrict | No |
| Activity_Program | Activity_Program | _ | Restrict | No |
| Work_String | Work_String | _ | Restrict | No |
| Borehole_Zone | Borehole_Zone | _ | Assoc to Many | No |
| Borehole | Borehole | _ | Cascade | Yes |
| Borehole_Section | Borehole_Section | _ | Assoc to Many | No |
| Super_Activity | Activity | _ | Assoc to One | No |