Well_Test_Interpretation

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

Name	Well_Test_Interpretation
Entity Type	Table
Description	An interpretation of the data acquired during a well test. An interpretation generally results in the generation of characteristics for the well, or well completion and/or characteristics of the region within the radius of investigation of the well test. Note that an interpretation does not store characteristics of the material that is being tested.
Submodel	Well_Testing
Entity Scope	Project
Primary Key	Id
Natural Key
Generalizations	Activity , Entity , IT_Object , Tracked_Object
Specializations

Columns

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Name	Value Domain	Property / Storage Unit	Description	Required / Default	Type
Active_Observer_Gauge_Dist	double	Length m	The distance between the active and the observer gauges.	No	NUMBER
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)
Average_Back_Pressure	double	Pressure kPa	The average pressure within a system caused by fluid friction or an induced resistance to flow through the system. Most process facilities require a minimum system pressure to operate efficiently. The necessary back-pressure is often created and controlled by a valve that is set to operate under the desired range of conditions. [Oilfield Glossary]	No	NUMBER
Average_Darcy_Pressure	double	Pressure kPa	The average Darcy pressure.	No	NUMBER
Average_Pressure_Gradient	double	Pressure_Per_Length kPa/m	The change in pressure per unit of depth.	No	NUMBER
Average_Reservoir_Pressure	double	Pressure kPa	The average reservoir pressure computed from the plotted gauge information. <or> The pressure that would be obtained if all fluid motion ceases in a given volume of reservoir. It also is the pressure to which a well will ultimately rise if shut in for an infinite period. [Oilfield Glossary]	No	NUMBER
Average_Tubing_Gradient	double	Pressure_Per_Length kPa/m	The pressure change per unit of the depth in the tubing.	No	NUMBER
Backpressure_Coefficient	double	No_Unit	The coefficient of the backpressure equation, which is the deliverability equation developed from multi-rate or isochronal testing of gas wells.	No	NUMBER
Backpressure_Exponent	double	No_Unit	The value of the exponent of the backpressure curve, which is the deliverability equation developed from multi-rate or isochronal testing of gas wells.	No	NUMBER
Boundary_Distance	double	Length m	The extent to which the borehole affects the surrounding area.	No	NUMBER
Calc_Absolute_Open_Flow	double	Gas_Flowrate m3/h	The calculated flow rate that a system may provide in the absence of restrictions.	No	NUMBER
Calculated_Formation_EMW	double	No_Unit	The calculated formation equivalent mud weight.	No	NUMBER
Comm_Test_Gauge_Slope	double	No_Unit	The slope of the straight line portion of the semilog plot of Delta P vs. time.	No	NUMBER
Comm_Test_Pressure_Gradient	double	Pressure_Per_Length kPa/m	The change in pressure per unit of depth for a communication test.	No	NUMBER
Comm_Test_Response	double	Percent %	Measure response for a communication test. Expressed as percent.	No	NUMBER
Confidence_Limit	double	Percent %	Final extrapolated confidence limit (percentage). Indicates the degree of confidence associated with extrapolated reservoir pressure.	No	NUMBER
Corrected_Datum_Depth	double	Depth m	The depth corrected to datum.	No	NUMBER
Crush_Damage_Ratio	double	Dimensionless	The crush damage ratio.	No	NUMBER
Crush_Zone_Diameter	double	Length m	The extent of the area surrounding a perforation tunnel where the action of the perforating charge has altered the formation structure and permeability. Although it is generally damaging to production, the severity or extent of the crushed zone depends greatly on the characteristics of the formation. [Oilfield Glossary]	No	NUMBER
Cumulative_Prod_Inj_Time	double	Time s	Last stabilized production/injection time prior to shutin	No	NUMBER
Darcy_Productivity_Index	double	Flowrate_Per_Pressure m3/(d.kPa)	The Darcy ratio of flow rate to pressure drop (between the reservoir and bottom hole pressures) .	No	NUMBER
Datum_Depth_BHP	double	Pressure kPa	The bottom hole pressure at the datum depth.	No	NUMBER
Delta_Pressure	double	Pressure kPa	A change in pressure, with an increase in pressure defined as a positive value. When defined between two points, the from and to directions must be defined by the association between the points. [POSC]	No	NUMBER
Drainage_Area	double	Area m2	The reservoir area or volume drained by the well [Oilfield Glossary].	No	NUMBER
Drainage_Radius	double	Length m	The radius, measured from a wellbore, of a circular area of a reservoir which is drained by a single well.	No	NUMBER
Drop_In_Annulus_Pressure	double	Pressure kPa	The drop in annulus pressure usually during DST tests.	No	NUMBER
Duration	double	Time s	The duration of the activity. For planned activities, this would be expected duration.	No	NUMBER
Effective_Permeability	double	Permeability mD	The measure of the capacity of a single fluid to flow through a rock when the pore spaces of the rock are not completely filled or saturated with the fluid. [POSC] <or> The ability to preferentially flow or transmit a particular fluid when other immiscible fluids are present in the reservoir (e.g., effective permeability of gas in a gas-water reservoir). The relative saturations of the fluids as well as the nature of the reservoir affect the effective permeability. [Oilfield Glossary]	No	NUMBER
Effective_Porosity	double	Porosity m3/m3	The fraction of the bulk volume of a solid material composed of void space which is sufficiently interconnected to support fluid flow. [POSC] <or> The interconnected pore volume or void space in a rock that contributes to fluid flow or permeability in a reservoir. Effective porosity excludes isolated pores and pore volume occupied by water adsorbed on clay minerals or other grains. Total porosity is the total void space in the rock whether or not it contributes to fluid flow. Effective porosity is typically less than total porosity. [Oilfield Glossary]	No	NUMBER
Effective_Radius	double	Length m	The characteristic radius of an object. This may be an average radius or a radius calculated from performance information (as with a completion interval). [POSC]	No	NUMBER
Effective_Wellbore_Length	double	Length m	The effective length of wellbore exposed for the test.	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
Estimated_Damage_Ratio	double	No_Unit	Undamaged permeability of the reservoir divided by the permeability measured during a DST. Reflects the skin damage.	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)
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)
Extrapolated_DD_Pressure	double	Pressure kPa	Extrapolated pressure from Horner plot at datum depth (P*).	No	NUMBER
Extrapolated_Gauge_Pressure	double	Pressure kPa	Extrapolated pressure from Horner plot at gauge depth.	No	NUMBER
Final_Obs_Pressure	double	Pressure kPa	The final pressure observed in the string.	No	NUMBER
Flow_Efficiency	double	No_Unit	The value that results when the actual productivity index is divided by the productivity index predicted from Darcy's law. Flow efficiency is greater than 1 in a stimulated well (skin < 0) and less than 1 for a damaged completion (skin > 0). [Oilfield Review]	No	NUMBER
Formation_Thickness	double	No_Unit	The thickness of the tested formation.	No	NUMBER
Formation_Volume_Factor	double	No_Unit	The ratio of the volume of fluid under reservoir conditions compared with the volume under standard temperature and pressure conditions.	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)
Gauge_Depth_BHP	double	Pressure kPa	The bottom hole pressure at the gauge depth.	No	NUMBER
Gauge_Slope_End_Point	double	Time s	The time offset for the end point of the straight line section on a Horner Plot, at which the slope is calculated.	No	NUMBER
Gauge_Slope_Start_Point	double	Time s	The time offset for the starting point of the straight line section on a Horner Plot, at which the slope is calculated.	No	NUMBER
Geologic_Layer_Id	Geologic_Layer		The layer that was targeted during the well test.	No	NUMBER(38)
Horner_Slope	double	Pressure_Per_Time kPa/h	The slope of the chosen straight-line section of a Horner plot. It is used to determine permeability thickness, kh, of the producing zone in the vicinity of the wellbore. [Oilfield Glossary]	No	NUMBER
Horner_Time	double	Time s	Used for horner calculations. The point in time when the horner slope started going straight.	No	NUMBER
Id	ID	No_Unit	Unique identifier for this entity.	Yes	NUMBER(38)
Injectivity_Index	double	Flowrate_Per_Pressure m3/(d.kPa)	The ratio of flow rate to pressure drop for fluids being injected. Used for water or gas wells, and is the barrels of fluid injected per day per psi decline in bottomhole flowing pressure.	No	NUMBER
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)
Interporosity_Flow_Coef	double	No_Unit	The coefficient variable used to determine how easily the fluids flow through the porous materials surrounding the borehole.	No	NUMBER
Interpretation_Method	R_Test_Analysis_Method		The method used in the interpretation results of the well test.	No	VARCHAR2(64)
Max_Reservoir_Pressure	double	Pressure kPa	The extrapolated maximum reservoir pressure (initial shut-in pressure) of the fluids within the pores of a reservoir, usually hydrostatic pressure, or the pressure exerted by a column of water from the formation's depth to sea level. Because reservoir pressure changes as fluids are produced from a reservoir, the pressure should be described as measured at a specific time, such as initial reservoir pressure. It is computed from the plotted gauge information.	No	NUMBER
Middle_Depth_Pressure	double	Pressure kPa	Pressure at depth at the middle of tested interval.	No	NUMBER
Middle_MD	double	Depth m	Depth at the middle of the tested interval.	No	NUMBER
Mobility	double	Mobility mD/cP	The characteristic of a fluid in a permeable system that is calculated as the effective permeability divided by fluid viscosity. [POSC]	No	NUMBER
Mobility_Quality_Desc	CODE	NA	Free-form text that is used to describe the mobility quality of the materials being produced by the borehole.	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)
Net_Payzone_Thickness	double	Length m	The net thickness of the payzone.	No	NUMBER
One_Hour_DD_Pressure	double	Pressure kPa	Curve extrapolated pressure at one hour at datum depth	No	NUMBER
One_Hour_Gauge_Pressure	double	Pressure kPa	Curve extrapolated pressure at one hour at gauge depth.	No	NUMBER
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)
Permeability	double	Permeability mD	The measure of the capacity of a porous material to permit fluid flow. [POSC] <or> The ability, or measurement of a rock's ability, to transmit fluids, typically measured in darcies or millidarcies. Formations that transmit fluids readily, such as sandstones, are described as permeable and tend to have many large, well-connected pores. Impermeable formations, such as shales and siltstones, tend to be finer grained or of a mixed grain size, with smaller, fewer, or less interconnected pores. [Oilfield Glossary]	No	NUMBER
Permeability_Quality_Desc	CODE	NA	Free-form text that described the permeability quality of the rock surrounding the borehole.	No	VARCHAR2(64)
Permeability_Thickness	double	Volume m3	The product of permeability and thickness at an interface between two bodies capable of exchanging fluids, such as a well completion between a reservoir and a well. [POSC]	No	NUMBER
Pore_Pressure	double	Pressure kPa	The static pressure of fluids within the pore space of a porous material. [POSC] <or> The pressure of fluids within the pores of a reservoir, usually hydrostatic pressure, or the pressure exerted by a column of water from the formation's depth to sea level. When impermeable rocks such as shales form as sediments are compacted, their pore fluids cannot always escape and must then support the total overlying rock column, leading to anomalously high formation pressures. [Oilfield Glossary]	No	NUMBER
Porosity	double	Porosity m3/m3	The fraction of the total volume of a solid object occupied by pore space. [POSC] <or> The percentage of pore volume or void space, or that volume within rock that can contain fluids. [Oilfield Glossary]	No	NUMBER
Preferred_Flag	boolean	NA	Indicates whether or not the well test interpretation properties that are stored in this record are the preferred values.	No	NUMBER(1)
Pressure_Datum_Desc	CODE	NA	A description of the pressure datum.	No	VARCHAR2(64)
Pressure_Datum_MD	double	Depth m	Depth of the Pressure Datum.	No	NUMBER
Produced_By	STRING64	NA	The name of application role that created the entity, for data created programmatically.	No	VARCHAR2(64)
Productivity_Index	double	Flowrate_Per_Pressure m3/(d.kPa)	The ratio of flow rate to pressure drop. Used for oil wells, PI is the barrels of oil produced per day per psi decline in bottomhole flowing pressure. [POSC]	No	NUMBER
Productivity_Index_SS	double	Flowrate_Per_Pressure m3/(d.kPa)	The ratio of flow rate to pressure drop at semi steady state.	No	NUMBER
Pseudo_Skin_Factor	double	Percent %	Indicates the effect of high velocity and turbulence on the skin factor, especially important for gas reservoirs that produce under constant bottomhole pressure conditions.	No	NUMBER
Purpose	STRING255	NA	A description of purpose of the activity or its stage	No	VARCHAR2(255)
Radius_Investigated	double	Length m	The radius of investigation (the distance from the hole that was investigated by the testing apparatus).	No	NUMBER
Remarks	STRING2000	NA	Any type of remarks added to an entity instance.	No	VARCHAR2(2000)
Reservoir_Boundary_Distance	double	Length m	The boundary distance that the borehole being tested affects the surrounding reservoir.	No	NUMBER
Reservoir_DD_Pressure	double	Pressure kPa	Reservoir pressure calculated at datum depth.	No	NUMBER
Reservoir_Gauge_Pressure	double	Pressure kPa	Reservoir pressure calculated at gauge depth.	No	NUMBER
SDAT_Label	int	No_Unit	Label used by the security system for entitlements. SDAT is Secure Data Access Technology.	No	NUMBER(10)
Sequence_Number	int	No_Unit	A number that can be used to distinguish a specific interpretation for a well test when there are several interpretations. It can also be used to represent the order in which the interpretation occurred for a well test.	No 1	NUMBER(10)
Skin_Effect	double	No_Unit	The term that accounts for additional pressure drops in the immediate vicinity of a well in well performance calculations, such as transient pressure test analysis. Positive skin effects indicate damaged conditions. Negative skin effects indicate stimulated conditions. [POSC]	No	NUMBER
Skin_Partial_Penetration	double	No_Unit	The term that accounts for additional pressure drops in the immediate vicinity of a well due to the borehole not completely penetrating the producing formation.	No	NUMBER
Slope_Four_Point_Test	double	No_Unit	Slope of Four Point Test	No	NUMBER
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
Storativity_Ratio	double	Dimensionless	Storativity Ratio.	No	NUMBER
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_Compressibility	double	Pressure kPa	The compressibility of the formation and existing fluids. Calculated by (Ct = Cf + SwCw + SoCo + Sg+Cg)	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)
True_Skin_Factor	double	Percent %	The factor related purely to the reservoir damage or stimulation, regardless of the completion type and other mechanical types. This can be changed by Acid stimulation.	No	NUMBER
Turbulence_Ind_Const	double	No_Unit	The constant used to calculated the turbulence index.	No	NUMBER
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)
Utilized_Facility_Id	Activity_Facility_Invl		The identifier of the facility that was used to collect the data for the interpretation results. E.g. The Primary Pressure Gauge which recorded the pressure data used in interpretation.	No	NUMBER(38)
Version	STRING255	NA	The form or variant of the entity.	Yes 1	VARCHAR2(255)
Vert_To_Horiz_Permeability	double	Dimensionless	A ratio of the permeability measured in the direction of the earth vertical to the permeability measured in the direction of the earth horizontal.	No	NUMBER
Vertical_Fracture_Slope	double	No_Unit	The slope of the vertical fracture.	No	NUMBER
Vertical_Mobility	double	Mobility mD/cP	Vertical mobility. The ratio of the vertical permeability to fluid viscosity.	No	NUMBER
Vertical_Permeability	double	Permeability mD	Permeability measured in the direction of the earth vertical. [POSC]	No	NUMBER
Water_Saturation	double	No_Unit	The fraction of water in a given pore space.	No	NUMBER
Well_Test_Id	Well_Test		The identifier of the well test whose data is being interpreted via this interpretation. An interpretation can be performed either for a well test or a well test stage.	Yes	NUMBER(38)
Well_Test_Stage_Id	Well_Test_Stage		The identifier of the well test stage whose data is being interpreted via this interpretation. An analysis can be performed either for a well test or a well test stage.	No	NUMBER(38)
Wellbore_Storage	double	No_Unit	Distortions in the reservoir response due to borehole storage. The characteristic trends are an early unit slope trend with pressure change and the derivative overlain on the log-log plot, followed by a "hump" in the pressure derivative that gradually disappears as reservoir trends become recognizable. Complex behavior in the borehole, such as borehole phase distribution, can result in a more complex transient trend. A crucial part of the transient analysis is to distinguish the effects of borehole storage from the interpretable reservoir response. [Oilfield Review]	No	NUMBER
Xf1_Length	double	Length m	The half-length of the first fracture (Xf1).	No	NUMBER
Xf2_Length	double	Length m	The half-length of the second fracture (Xf2).	No	NUMBER

Refers To

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Link	To Entity	Description	Implementation Technique	Required
Activity_Template	Activity_Template	_	Restrict	No
Fulfilled_Activity	Activity	_	Assoc to Many	No
Geologic_Layer	Geologic_Layer	The layer that was targeted during the well test.	Restrict	No
Well_Test_Stage	Well_Test_Stage	The identifier of the well test stage whose data is being interpreted via this interpretation. An analysis can be performed either for a well test or a well test stage.	Nullify	No
Super_Activity	Activity	_	Assoc to One	No
Utilized_Facility	Activity_Facility_Invl	The identifier of the facility that was used to collect the data for the interpretation results. E.g. The Primary Pressure Gauge which recorded the pressure data used in interpretation.	Restrict	No
Interpretation_Method	R_Test_Analysis_Method	The method used in the interpretation results of the well test.	Restrict	No
Triggering_Event	Event	_	Nullify	No
Transient_Period	R_Transient_Period	_	Restrict	No
Well_Test	Well_Test	The identifier of the well test whose data is being interpreted via this interpretation. An interpretation can be performed either for a well test or a well test stage.	Cascade	Yes

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

Well_Test_Interpretation

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