Leak_Off_Test

[Columns] [Composed Of] [Referenced By] [Refers To]

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

Columns

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Name	Value Domain / Measurement	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 Activity is an activation of, and is characterized by the associated Activity_Template.	No	NUMBER(38)
Actual_LOT_Pressure	double Pressure	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	To identify the borehole	Yes	NUMBER(38)
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	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	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	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	Measured depth of the formation at which fracture is expected to occur.	No	NUMBER
Formation_TVD	double Depth	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	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. This GUID is not generated by the database, but is the GUID used by the application on first access of this object. Use of this property is optional and completely under the control of application developers.	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	ID of the activity that was executing when the entity was created, 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 entity"s 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	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	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
Transient_Period	R_Transient_Period	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)

Composed Of

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Cardinality	Entity
Many	LOT_Detail

Referenced By

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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

Refers To

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Link	To Entity	Description	Implementation Technique	Required
Formation	Borehole_Zone	The formation that is being tested by the LOT	Nullify	No
Work_String	Work_String	_	Restrict	No
Borehole_Section	Borehole_Section	_	Assoc to Many	No
Borehole_Zone	Borehole_Zone	_	Assoc to Many	No
Borehole	Borehole	_	Cascade	Yes
Activity_Program	Activity_Program	_	Restrict	No
Transient_Period	R_Transient_Period	_	Restrict	No
Super_Activity	Activity	_	Assoc to One	No
Fulfilled_Activity	Activity	_	Assoc to Many	No
Triggering_Event	Event	_	Nullify	No
Activity_Template	Activity_Template	_	Restrict	No

[Seabed Objects] [Entities in Schema Seabed] [Index]

Leak_Off_Test

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