| Name | Core_Preservation |
|---|---|
| Entity Type | Table |
| Description | Core preservation activities are an attempt to maintain a sample, 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 | Property / Storage Unit | 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. 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) |
| 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 |
The name of application role that created the entity, for data created programmatically. | No |
VARCHAR2(64) |
| Rock_Sample_Id | Core |
|
The identifier of 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 | The identifier of 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 |