| Name | Core_Preservation |
|---|---|
| Entity Type | Extension of Core |
| Description | Core preservation activities are an attempt to maintain it, prior to analysis, in the same condition as existed upon its removal from the core barrel. In the process of cutting a core and bringing it to the surface, the fluid content of the rock is altered by unavoidable changes in pressure and temperature. Incorrect practices in preservation cause further alteration of the core and its fluids, making the core even less representative of the formation. Preservation methods target mechanical stabilization, prevention of fluid loss, or reduced contamination and are based upon rock type, degree of consolidation, and fluid type. |
| Submodel | Rock_Sample |
| Entity Scope | Project |
| Primary Key | Id |
| Natural Key | |
| Generalizations | IT_Object , Tracked_Object |
| Specializations |
| Name | Value Domain / Measurement | Description | Required / Default | Type |
|---|---|---|---|---|
| Core_Preservation_Remarks | REMARKS_STR NA |
Textual comments about the core preservation. | No |
VARCHAR2(999) |
| 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) |
| 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) |
| Preserve_Method | R_Preserve_Method |
The name of the preservation method utilized to preserve the core. A preservation method is used to preserve a rock sample for transportation or storage and to prevent sample deterioration or change in initial rock properties prior to analysis. Examples include, DRY, FROZEN, PLASTIC IMPREGNATED, WET, EPOXY, WAX DIP, CORE WRAP and CORE INNER BARREL. | Yes |
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) |
| Rock_Sample_Id | Core |
A number that uniquely identifies the core sample that was preserved. | Yes |
NUMBER(38) |
| SDAT_Label | int No_Unit |
Label used by the security system for entitlements. SDAT is Secure Data Access Technology. | No |
NUMBER(10) |
| 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) |
| Link | To Entity | Description | Implementation Technique | Required |
|---|---|---|---|---|
| Rock_Sample | Core | A number that uniquely identifies the core sample that was preserved. | Cascade | Yes |
| Preserve_Method | R_Preserve_Method | The name of the preservation method utilized to preserve the core. A preservation method is used to preserve a rock sample for transportation or storage and to prevent sample deterioration or change in initial rock properties prior to analysis. Examples include, DRY, FROZEN, PLASTIC IMPREGNATED, WET, EPOXY, WAX DIP, CORE WRAP and CORE INNER BARREL. | Restrict | Yes |